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People’s president

By www.thehindu.com
Published On :: Fri, 08 Jul 2016 14:57:37 +0530

Abraham Lincoln was one of the greatest and most revered presidents of the United States.


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Rose in my garden

By www.thehindu.com
Published On :: Thu, 14 Jul 2016 14:20:55 +0530


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Custodian of her forest garden

By www.thehindu.com
Published On :: Thu, 14 Jul 2016 14:30:46 +0530

For people like Bhanumathi, guarding and protecting their farms is a way of life.


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The eagle has landed

By www.thehindu.com
Published On :: Thu, 21 Jul 2016 13:33:01 +0530

On July 19, 1969, three astronauts, and the entire globe, celebrated the giant leap for mankind as they set foot on the Moon.


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Of gods and demons

By www.thehindu.com
Published On :: Thu, 21 Jul 2016 13:51:54 +0530

This week, we feature a book that is eligible for The Hindu Young World Goodbooks Award 2017. This book has been entered in the picture book category. Also, check out the second story in the Book-Asuras series.


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The Substitute Teacher: A sudden disappearance

By www.thehindu.com
Published On :: Wed, 18 Jan 2023 12:52:25 +0530

No warning and no goodbyes... was this how VI C wanted the ST chapter to end?


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Deconstructive annulation mediated one-pot synthesis of xanthene derivatives

By pubs.rsc.org
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Org. Biomol. Chem., 2024, Advance Article
DOI: 10.1039/D4OB00093E, Paper
Balasubramaniyam Manikandan, Subbiah Thamotharan, Olivier Blacque, Subramaniapillai Selva Ganesan
One-pot, two-step methodology utilized for the sequential C–O/C–N cleavage followed by intramolecular/intermolecular annulation reaction.
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Siloxane-containing phosphine (oxide) ligands for enhanced catalytic activity of cobalt complexes for hydrosilylation reactions

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Org. Biomol. Chem., 2024, Advance Article
DOI: 10.1039/D4OB00333K, Paper
Peng Liu, Jiajian Peng, Ying Bai, Jiayun Li
A series of siloxane-containing phosphine (oxide) ligands have been designed and synthesized.
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Click synthesis of dendronized malonates for the preparation of amphiphilic dendro[60]fullerenes

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Org. Biomol. Chem., 2024, Advance Article
DOI: 10.1039/D3OB01986A, Paper
Carlos Cruz-Hernández, Perla Y. López-Camacho, Gustavo Basurto-Islas, Aaron Rojas, Patricia Guadarrama, Melchor Martínez-Herrera
Click chemistry is a valuable methodology for obtaining dendronized malonate derivatives to derivatize C60 using the Bingel–Hirsch reaction.
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BODIPY(aryl)iodonium salts in the efficient synthesis of diversely functionalized BODIPYs and selective detection of serum albumin

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Org. Biomol. Chem., 2024, Advance Article
DOI: 10.1039/D4OB00336E, Paper
Open Access
Bintu Kumar, Anindita Bhatta, Prakriti Saraf, Taur Prakash Pandurang, Krishnan Rangan, Madhushree Sarkar, Sivaprasad Mitra, Dalip Kumar
Using readily available BODIPY and iodoarenes various BODIPY(aryl)iodonium salts were prepared and successfully utilized for the direct syntheses of functionalized BODIPYs, bis-BODIPYs and for the selective detection of serum protein.
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Metal- and light-free decarboxylative direct C–H alkylation of heteroarenes at room temperature

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Org. Biomol. Chem., 2024, Advance Article
DOI: 10.1039/D4OB00187G, Paper
Tong-Bo Zhang, Xi-Dong Guan, Yan Gao, Shi-Chao Lu, Bing-Long Li
This study reports a metal- and light-free decarboxylative C–H alkylation of heteroarenes at room temperature.
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A water mediated multicomponent reaction for the synthesis of novel spirooxindole derivatives and their antifungal activity

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Org. Biomol. Chem., 2024, Advance Article
DOI: 10.1039/D4OB00256C, Paper
Min Zhang, Liang Shi, Li Chen, Zhengyu Liu, Ting Zhao, Chunyin Zhu, Liuqing Yang
A total of 27 novel spirooxindoles were synthesized through a water mediated three-component reaction of isatin, 4-aminocoumarin, and 1,3-cyclodicarbonyl compounds. Several compounds showed excellent antifungal activity against Physalospora piricola.
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Dehydrative alkynylation of 3-hydroxyisoindolinones with terminal alkynes for the synthesis of 3-alkynylated 3,3-disubstituted isoindolinones

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Published On ::

Org. Biomol. Chem., 2024, Advance Article
DOI: 10.1039/D4OB00190G, Paper
Kai-Cheng Yang, Shi-Lu Zheng, Zhong Wen, Yu-Shan Zhang, Hai-Liang Ni, Long Chen
A HOTf or Fe(OTf)3-catalyzed dehydrative alkynylation of 3-hydroxyisoindolinones with terminal alkynes was developed, which represents a brand-new procedure for the synthesis of 3-alkynylated 3,3-disubstituted isoindolinones.
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Diastereoselective synthesis of functionalized spiroindolines via intramolecular ipso-iodocyclization/nucleophile addition cascade reactions of indole-tethered ynones

By pubs.rsc.org
Published On ::

Org. Biomol. Chem., 2024, Advance Article
DOI: 10.1039/D4OB00112E, Paper
Debojyoti Bag, Sanghapal D. Sawant
Herein, we describe a highly diastereoselective approach for synthesizing polyfunctionalized spiroindolines from indolyl-ynones involving an ipso-iodocyclization/nucleophile addition cascade.
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Kinetic resolution of 1,1'-binaphthyl-2,2'-diamine derivatives by chiral calcium phosphate-catalyzed acylation

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Org. Biomol. Chem., 2024, Advance Article
DOI: 10.1039/D4OB00355A, Paper
Tatsuhiro Uchikura, Yuki Kanno, Yukino Fukuda, Mikoto Sato, Takahiko Akiyama
Chiral calcium phosphate-catalyzed kinetic resolution of BINAM derivatives.
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Copper catalyzed dehydrogenative cyclization, alkenylation towards dihydroquinolinones

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Org. Biomol. Chem., 2024, Accepted Manuscript
DOI: 10.1039/D4OB00134F, Paper
Pari Keerthana, Fazlur-Rahman Nawaz Khan
An efficient copper-catalysized one-pot sequential synthesis of alkenylated quinolinyldihydroquinolinones is reported utilizing ketones, 1,3-cyclohexanediones, and benzyl alcohols via dehydrogenative cyclisation, followed by alkenylation. This highly straightforward method provides a mild...
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On the mechanism of carboxylate elimination from carbohydrate monoester-derived radicals

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Org. Biomol. Chem., 2024, Advance Article
DOI: 10.1039/D4OB00241E, Communication
Open Access
  This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
Julia A. Turner, Hendrik Zipse, Mark S. Taylor
Computational analysis of the HAT-induced expulsion of carboxylic acids from monoacylated pyranosides implicates concerted elimination through a hydrogen-bonded transition state.
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An efficient synthesis of mono-, di-, and tri-substituted 1,3-thiazoles employing functionalized thioamides as thiocarbonyl precursors

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Org. Biomol. Chem., 2024, Advance Article
DOI: 10.1039/D4OB00229F, Paper
Kalleshappa Sheela, Chikkappaiahnayaka Santhosh, Krishna Ravi Singh, Kalleshappa Sharath, Maralinganadoddi P. Sadashiva
Herein, we report an efficient strategy to synthesize functionalized 1,3-thiazoles using alkyl 2-amino-2-thioxoacetates.
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Electrochemical and photochemical reaction of isatins: a decade update

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Org. Biomol. Chem., 2024, Advance Article
DOI: 10.1039/D4OB00202D, Review Article
Nandini M. Gotgi, J. Saurab Jain, Rita Pal, Debashis Ghosh
This review presents all the recent reports on electro- and photochemical reactions of isatins over the last decade.
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A rhodium-catalyzed cascade C–H activation/annulation strategy for the expeditious assembly of pyrrolidinedione-fused 1,2-benzothiazines

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Published On ::

Org. Biomol. Chem., 2024, Advance Article
DOI: 10.1039/D4OB00193A, Paper
Yinsong Wu, Guanghao Shi, Yanan Liu, Yangzilin Kong, Mengdi Wu, Demao Wang, Xiaobing Wu, Yongjia Shang, Xinwei He
We have developed a cascade annulation strategy triggered by rhodium(III)-catalyzed C–H activation for the expeditious assembly of pyrrolidinedione-fused 1,2-benzothiazines from free NH-sulfoximines with maleimides under mild conditions.
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Generation of sulfones utilizing β-sulfinyl esters as masked aryl sulfinates under redox-neutral conditions

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Org. Biomol. Chem., 2024, Advance Article
DOI: 10.1039/D4OB00238E, Communication
Yixin Zhang, Zhu Yang, Hongjun Yang, Xuefeng Li, Lu Yang
A method for generation of SVI sulfones from β-sulfinyl esters (SIV) under transition-metal-free non-oxidative mild conditions is presented.
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Correction: Recent progress of core-substituted naphthalenediimides: highlights from 2010

By pubs.rsc.org
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Org. Biomol. Chem., 2024, Advance Article
DOI: 10.1039/D4OB90045F, Correction
Open Access
  This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
Sheshanath V. Bhosale, Sidhanath V. Bhosale, Suresh K. Bhargava
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Photoinduced decatungstate-catalyzed C(sp3)–H thioetherification by sulfinate salts

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Published On ::

Org. Biomol. Chem., 2024, Advance Article
DOI: 10.1039/D4OB00394B, Paper
Pengcheng Li, Jia-Lin Tu, Ao-Men Hu, Lin Guo, Chao Yang, Wujiong Xia
A visible light photoinduced decatungstate-catalyzed C(sp3)–H thioetherification of hydrocarbons by sodium sulfite is herein reported.
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A copper-catalyzed asymmetric Friedel–Crafts hydroxyalkylation of pyrazole-4,5-diones with 5-aminoisoxazoles

By pubs.rsc.org
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Org. Biomol. Chem., 2024, Advance Article
DOI: 10.1039/D4OB00322E, Communication
Siyu Gao, Xiang Sun, Sijie Peng, Zhenggen Zha, Qi Sun, Zhiyong Wang
An asymmetric Friede-Crafts hydroxyalkylation reaction was developed under the catalysis of chiral copper complexes. A variety of pyrazolone derivatives were obtained with excellent yields and enantioselectivities.
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Synthesis of fluorescent 5-heteroarylpyrimidine-containing oligonucleotides via post-synthetic trifluoromethyl conversion

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Org. Biomol. Chem., 2024, Advance Article
DOI: 10.1039/D4OB00402G, Paper
Yuta Ito, Hisato Tanaka, Ayana Murakami, Yasufumi Fuchi, Yoshiyuki Hari
5-(Benzimidazol-2-yl)- and 5-(benzothiazol-2-yl)-pyrimidine bases-modified oligonucleotides were prepared by post-synthetic trifluoromethyl conversion and their fluorescence properties were measured.
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The synthesis of alk-2-ynl Weinreb amides via Pd/Cu-catalysed oxidative carbonylation of terminal alkynes

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Org. Biomol. Chem., 2024, Advance Article
DOI: 10.1039/D4OB00290C, Paper
Bharati Mourya, Sandip T. Gadge, Bhalchandra M. Bhanage
Synthesis of alk-2-ynl-Weinreb amides via Pd-catalyzed oxidative carbonylation of terminal alkynes and N,O-dimethylhydroxylamine hydrochloride at room temperature under low CO/O2 pressure is reported for the first time.
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Synthesis of Asp-based lactam cyclic peptides using an amide-bonded diaminodiacid to prevent aspartimide formation

By pubs.rsc.org
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Org. Biomol. Chem., 2024, Advance Article
DOI: 10.1039/D4OB00472H, Communication
Wen-Jie Li, Jun-You Chen, Hui-Xia Zhu, Yi-Ming Li, Yang Xu
A diaminodiacid (DADA) containing an amide bond can be used in Fmoc solid-phase peptide synthesis (SPPS) of an Asp-based lactam cyclic peptide with no aspartimide formation.
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Synthesis of alkenylphosphine oxides via Tf2O promoted addition–elimination of ketones and secondary phosphine oxides

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Org. Biomol. Chem., 2024, Advance Article
DOI: 10.1039/D4OB00318G, Communication
Jiangkai Ma, Lianjie Wang, Anjiang Qiao, Zhongxian Li, Fengqian Zhao, Junliang Wu
An efficient method for the synthesis of alkenylphosphine oxides via the addition-elimination of SPOs to ketones has been developed. The reaction exhibits good yields and compatibility. Several conversions have also proven the value of this method.
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Friedel–Crafts reactions for biomolecular chemistry

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Org. Biomol. Chem., 2024, Advance Article
DOI: 10.1039/D4OB00406J, Review Article
Open Access
Jun Ohata
This review demonstrates advances in Friedel–Crafts alkylation and acylation reactions in a variety of biomolecular chemistry fields.
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Reduction of sulfoxides catalyzed by the commercially available manganese complex MnBr(CO)5

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Org. Biomol. Chem., 2024, Accepted Manuscript
DOI: 10.1039/D4OB00204K, Paper
Open Access
  This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
Daniel Leal Lourenço, Ana Cristina Fernandes
A new methodology for the reduction of a wide variety of aliphatic and aromatic sulfoxides catalyzed by the air-stable, cheap and commercially available manganese catalyst MnBr(CO)5 with excellent yields is...
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Recent advances in spirocyclization of maleimides via transition-metal catalyzed C–H activation

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Org. Biomol. Chem., 2024, 22,2916-2947
DOI: 10.1039/D3OB01904G, Review Article
Swadhin Swaraj Acharya, Sagarika Patra, Rojalini Maharana, Manaswini Dash, Liza Mama Barad, Bibhuti Bhusan Parida
In recent years, the maleimide scaffold has received a great deal of attention in C–H activation.
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Vinylogous and stereoselective domino synthesis of pyrano[2,3-c]pyrroles from alkylidene meldrum's acids

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Published On ::

Org. Biomol. Chem., 2024, 22,2948-2952
DOI: 10.1039/D4OB00233D, Communication
Mariia Savchuk, Giang Vo-Thanh, Sylvain Oudeyer, Hélène Beucher, Jean-François Brière
An expeditious diatereoselective synthesis of pyrano[2,3-c]pyrroles thanks to a domino Vinylogous aza-Michael-Aldol-Cyclocondensation (aza-VMAC) reaction to alkylidene Meldrum's acid derivatives.
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Not exclusively the activity, but the sweet spot: a dehydrogenase point mutation synergistically boosts activity, substrate tolerance, thermal stability and yield

By pubs.rsc.org
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Org. Biomol. Chem., 2024, 22,3009-3018
DOI: 10.1039/D4OB00211C, Paper
Yu-Ke Cen, Lin Zhang, Yue Jiang, Xiang-Fu Meng, Yuan Li, Chao Xiang, Ya-Ping Xue, Yu-Guo Zheng
A single-point mutation of 7α-HSDH achieved the highest activity and synergistically improved substrate tolerance, thermal stability, cofactor affinity, and conversion rate.
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Hydrosilylation of nitriles and tertiary amides using a zinc precursor

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Org. Biomol. Chem., 2024, 22,3053-3058
DOI: 10.1039/D4OB00161C, Paper
Ravi Kumar, Rohan Kumar Meher, Himadri Karmakar, Tarun K. Panda
A competent and selective hydrosilylation of nitriles and tertiary amides catalyzed by zinc bis(hexamethyldisilazide) [Zn(HMDS)2] under solvent-free and mild conditions are reported, as a sustainable and desirable alternative to existing methods.
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A phosphamide nucleotide analog: a substrate for polymerase synthesis of DNA

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Org. Biomol. Chem., 2024, 22,2963-2967
DOI: 10.1039/D4OB00089G, Communication
Jiong Meng, Qiaqia Guo, Xiaona Zhai, Song Yang, Shuai Wang, Pengcheng Wang, Debin Ji
A phosphamide nucleotide analog (dNTPγNH2) exhibited higher stability than dNTPs and can be recognized by DNA polymerases in PCR.
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Synthesis of alkynyl sulfides via base-promoted nucleophilic ring-opening of α-bromostyrene sulfonium salt

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Org. Biomol. Chem., 2024, 22,2953-2957
DOI: 10.1039/D4OB00203B, Communication
Junqi Zhou, Ziyu Wang, Hanmiao Xu, Mengke Su, Jian Wen
An effective method for synthesizing various alkynyl sulfides has been developed using tetramethylene sulfoxide as a sulfur source through base-promoted nucleophilic ring-opening reactions.
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Identification and quantification of local antiaromaticity in polycyclic aromatic hydrocarbons (PAHs) based on the magnetic criterion

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Org. Biomol. Chem., 2024, 22,3035-3044
DOI: 10.1039/D4OB00114A, Paper
Open Access
  This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
Erich Kleinpeter, Andreas Koch
The ring current effect of entirely and partly (anti)aromatic PCHs are calculated and employed to visualize, qualify and quantify existing (anti)aromaticity, especially to decide unequivocally between PAHs and PAAHs.
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A pyridine-N-oxide catenane for cation recognition

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Org. Biomol. Chem., 2024, 22,3001-3008
DOI: 10.1039/D4OB00176A, Paper
Open Access
  This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
Sean R. Barlow, Nathan R. Halcovitch, Nicholas H. Evans
A pyridine-N-oxide containing [2]catenane may be reversibly protonated, as well as bind lithium cations more strongly than sodium cations.
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Palladium-catalyzed (Z)-selective allylation of phosphine oxides with vinylethylene carbonates to construct phosphorus allyl alcohols

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Org. Biomol. Chem., 2024, 22,3068-3072
DOI: 10.1039/D4OB00354C, Paper
Hua Huang, Yi-Qi Wu, Lu-Yao Han, Lu Jiang, Zhuo-Zhuo Zhang, Xiang Zhang, Bo Han, Wei Huang, Jun-Long Li
A general and efficient method for the highly stereoselective synthesis of (Z)-phosphorus allylalcohols has been developed using the Pd-catalyzed cross-coupling of phosphine oxides with vinylethylene carbonates.
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Stereoselective synthesis of (R)- and (S)-1,2-diazetidine-3-carboxylic acid derivatives for peptidomimetics

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Org. Biomol. Chem., 2024, 22,2974-2977
DOI: 10.1039/D4OB00278D, Communication
Open Access
  This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
Matthew Nutter, Henry Stone, Michael Shipman, Stefan Roesner
Stereoselective synthesis of both enantiomers of orthogonally protected 1,2-diazetidine-3-carboxylic acid (aAze) from homochiral glycidol and its application in peptidomimetics.
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Selective enhancement of (6–4) photoproduct formation in dithymine dinucleotides driven by specific sugar puckering

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Org. Biomol. Chem., 2024, 22,3025-3034
DOI: 10.1039/D4OB00279B, Paper
Jouda Jakhlal, Clément Denhez, Stéphanie Coantic-Castex, Agathe Martinez, Dominique Harakat, Thierry Douki, Dominique Guillaume, Pascale Clivio
Evidence is presented that (6–4) photoproduct formation between two thymine residues in dinucleotide analogues is significantly and specifically enhanced when the 5''- and 3''-end sugar puckering are mainly north and south, respectively.
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Iron-catalyzed selective construction of indole derivatives via oxidative C(sp3)–H functionalization of indolin-2-ones

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Org. Biomol. Chem., 2024, 22,3073-3079
DOI: 10.1039/D4OB00133H, Paper
Wei Chen, Lang-Qi Wen, Xiao-Bing Lu, Hui Zhou
We have developed a clean and efficient iron-catalyzed C(sp3)–H functionalization of indolin-2-ones for the chemodivergent synthesis of value-added indole derivatives, including isatins, and symmetrical and non-symmetrical isoindigos.
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Direct access to pyrrole anhydrides via oxidative self-coupling of pyrrole carboxaldehydes

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Org. Biomol. Chem., 2024, 22,3045-3052
DOI: 10.1039/D4OB00052H, Paper
Surabhi Panday, Tapas Maity, Pratibha Bhatti, Joydev K. Laha
An elegant synthesis of pyrrole-2-carboxylic acid anhydrides from pyrrole-2-carboxaldehydes using TBAI as a catalyst and tert-butyl hydroperoxide (TBHP) as an oxidant is described herein.
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Photochromism of phenazine-2,3-diol derivatives through excited state intermolecular proton transfer based on keto–enol tautomerization

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Org. Biomol. Chem., 2024, Advance Article
DOI: 10.1039/D4OB00387J, Paper
Open Access
  This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
Kazuki Ohira, Kumpei Kozuka, Naoki Kaneda, Masahiro Yamamoto, Keiichi Imato, Yousuke Ooyama
It was found that phenazine-2,3-diol derivatives exhibit photochromism through excited state intermolecular proton transfer (ESInterPT) processes based on keto–enol tautomerization.
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BBr3-mediated dearomative spirocyclization of biaryl ynones: facile access to spiro[5.5]dienones

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Org. Biomol. Chem., 2024, Advance Article
DOI: 10.1039/D4OB00274A, Communication
Gaurav Jaiswal, Subhas Chandra Pan
BBr3 mediated dearomative spirocyclization of biaryl ynones has been reported for the direct synthesis of spiro[5.5]dienones with a tri-substituted double bond.
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3-Halo-5,6-dihydro-4H-1,2-oxazine N-oxides as synthetic equivalents of unsaturated nitrile oxides in the [3 + 2]-cycloaddition with arynes: synthesis of substituted 3-vinyl-1,2-benzisoxazoles

By pubs.rsc.org
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Org. Biomol. Chem., 2024, Advance Article
DOI: 10.1039/D4OB00391H, Communication
Alexander A. Lukoyanov, Svetlana A. Aksenova, Andrey A. Tabolin, Alexey Yu. Sukhorukov
3-Halo-1,2-oxazine N-oxide derivatives act as surrogates of vinyl nitrile oxides in tandem [3 + 2]-cycloaddition/[3 + 2]-cyclofragmentation with arynes leading to benzisoxazoles.
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Dess–Martin periodinane-mediated oxidation of the primary alcohol of cytidine into a carboxylic acid

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Org. Biomol. Chem., 2024, Advance Article
DOI: 10.1039/D4OB00240G, Communication
Open Access
  This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
Alexandra R. E. Serre, Vibhu Jha, Adèle Rivault, Leif A. Eriksson, Goreti Ribeiro Morais, Robert A. Falconer
Herein we describe the first example of the conversion of the primary alcohol of cytidine into a carboxylic acid by use of the Dess–Martin periodinane oxidising agent.
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Electro-oxidative three-component cascade coupling of isocyanides with elemental sulfur and amines for the synthesis of 2-aminobenzothiazoles

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Org. Biomol. Chem., 2024, Accepted Manuscript
DOI: 10.1039/D4OB00432A, Paper
Peng-Fei Huang, Jia-Le Fu, Ying Peng, Jian-Hong Fan, Long-Jin Zhong, Kewen Tang, Yu Liu
2-Aminobenzothiazoles are commonly encountered in various functional compounds. Herein, we disclose an electro-oxidative three-component reaction for the effective synthesis of 2-aminobenzothiazoles under mild conditions, utilizing non-toxic and abundant elemental sulfur...
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Design, synthesis, biological evaluation and molecular docking studies of quinoline-anthranilic acid hybrids as potent anti-inflammatory drugs

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Org. Biomol. Chem., 2024, Advance Article
DOI: 10.1039/D4OB00040D, Paper
Sidra Siddique, Khalid Hussain, Naureen Shehzadi, Muhammad Arshad, Muhammad Nadeem Arshad, Sadaf Iftikhar, Farhat Saghir, Ayisha Shaukat, Muhammad Sarfraz, Nisar Ahmed
Despite the high global prevalence, rheumatoid arthritis lacks a satisfactory treatment.
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Discovery of selective monosaccharide receptors via dynamic combinatorial chemistry

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Org. Biomol. Chem., 2024, Advance Article
DOI: 10.1039/D4OB00015C, Communication
Open Access
  This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
Miguel Alena-Rodriguez, Marcos Fernandez-Villamarin, Ignacio Alfonso, Paula M. Mendes
An effective workflow to discover selective saccharide receptors by combining dynamic combinatorial chemistry with isothermal titration calorimetry and NMR.
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