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Kumar S, Chand S, Singh KN. Electro-oxidative coupling of Bunte salts with aryldiazonium tetrafluoroborates: a benign access to unsymmetrical sulfoxides. Org Biomol Chem 2024; 22:850-856. [PMID: 38175526 DOI: 10.1039/d3ob01955a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2024]
Abstract
An electrochemical strategy for the synthesis of unsymmetrical sulfoxides has been explored using Bunte salts and aryldiazonium tetrafluoroborates under constant current electrolysis at room temperature. In addition to being eco-safe and using mild conditions, the present protocol is free from the use of metal/oxidant, and is endowed with a broad substrate scope and good functional group tolerance.
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Affiliation(s)
- Saurabh Kumar
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India.
| | - Shiv Chand
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India.
| | - Krishna Nand Singh
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India.
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2
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Chand S, Sharma AK, Pandey AK, Singh KN. Synthesis of unsymmetrical ketones via dual catalysed cross-coupling of α,β-unsaturated carboxylic acids with aryldiazonium salts. Chem Commun (Camb) 2023. [PMID: 38013486 DOI: 10.1039/d3cc04898e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2023]
Abstract
A visible light-enabled synthesis of unsymmetrical ketones has been accomplished by the cross-coupling of α,β-unsaturated carboxylic acids and aryldiazonium salts embracing a synergistic eosin Y and Co(OAc)2·4H2O catalysis. The reaction involves decarboxylative aerobic CC bond cleavage, and is endowed with the creation of new C-C and C-O bonds with good substrate scope.
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Affiliation(s)
- Shiv Chand
- Department of Chemistry Institute of Science Banaras Hindu University, Varanasi 221005, India.
| | - Anup Kumar Sharma
- Department of Chemistry Institute of Science Banaras Hindu University, Varanasi 221005, India.
| | - Anand Kumar Pandey
- Department of Chemistry Institute of Science Banaras Hindu University, Varanasi 221005, India.
| | - Krishna Nand Singh
- Department of Chemistry Institute of Science Banaras Hindu University, Varanasi 221005, India.
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3
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Kumar K, Gupta P, Singh KN, Nirgude MS, Srivastava H, Sharma S, Sevanthi AM, Durgesh K, Jain PK, Gaikwad K. Whole chloroplast genome-specific non-synonymous SNPs reveal the presence of substantial diversity in the pigeonpea mini-core collection. 3 Biotech 2023; 13:365. [PMID: 37840876 PMCID: PMC10575842 DOI: 10.1007/s13205-023-03785-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Accepted: 09/13/2023] [Indexed: 10/17/2023] Open
Abstract
To unravel the plastid genome diversity among the cultivated groups of the pigeonpea germplasm, we characterized the SNP occurrence and distribution of 142 pigeonpea mini-core collections based on their reference-based assembly of the chloroplast genome. A total of 8921 SNPs were found, which were again filtered and finally 3871 non-synonymous SNPs were detected and used for diversity estimates. These 3871 SNPs were classified into 12 groups and were present in only 44 of the 125 genes, demonstrating the presence of a precise mechanism for maintaining the whole chloroplast genome throughout evolution. The Acetyl-CoA carboxylase D gene possesses the maximum number of SNPs (12.29%), but the Adenosine Tri-Phosphate synthatase cluster genes (atpA, atpB, atpE, atpF, atpH, and atpI) altogether bear 43.34% of the SNPs making them most diverse. Various diversity estimates, such as the number of effective alleles (1.013), Watterson's estimate (0.19), Tajima's D ( - 3.15), Shannon's information index (0.036), suggest the presence of less diversity in the cultivated gene pool of chloroplast genomes. The genetic relatedness estimates based on pairwise correlations were also in congruence with these diversity descriptors and indicate the prevalence of rare alleles in the accessions. Interestingly, no stratification was observed either through STRUCTURE, PCoA, or phylogenetic analysis, indicating the common origin of the chloroplast in all the accessions used, irrespective of their geographical distribution. Further 6194 Cleaved Amplified Polymorphic Sequences (CAPS) markers for 531 SNPs were developed and validated in a selected set of germplasm. Based on these results, we inferred that all of the cultivated gene pools of pigeonpea have a common origin for the chloroplast genome and they possess less diversity in protein-coding regions, indicating a stable and evolved plastid genome. At the same time, all diversity analysis indicates the occurrence of rare alleles, suggesting the suitability of the mini-core collection in future pigeonpea improvement programs. In addition, the development of chloroplast genome-based CAPS markers would have utility in pigeonpea breeding programs. Supplementary Information The online version contains supplementary material available at 10.1007/s13205-023-03785-8.
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Affiliation(s)
- Kuldeep Kumar
- ICAR-National Institute for Plant Biotechnology, New Delhi, India
- ICAR-Indian Institute of Pulses Research, Kanpur, Uttar Pradesh India
| | - Palak Gupta
- ICAR-National Institute for Plant Biotechnology, New Delhi, India
| | | | | | | | - Sandhya Sharma
- ICAR-National Institute for Plant Biotechnology, New Delhi, India
| | | | - Kumar Durgesh
- Division of Genetics, ICAR-Indian Agricultural Research Institute, New Delhi, India
| | | | - Kishor Gaikwad
- ICAR-National Institute for Plant Biotechnology, New Delhi, India
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4
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Poonam, Sharma R, Sharma P, Sharma NC, Kumar K, Singh KN, Bhardwaj V, Negi N, Chauhan N. Exploring genetic diversity and ascertaining genetic loci associated with important fruit quality traits in apple ( Malus × domestica Borkh.). Physiol Mol Biol Plants 2023; 29:1693-1716. [PMID: 38162921 PMCID: PMC10754789 DOI: 10.1007/s12298-023-01382-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Revised: 10/18/2023] [Accepted: 10/23/2023] [Indexed: 01/03/2024]
Abstract
Genetic diversity is the primary source of variability in any crop improvement program, and the diverse germplasm of any crop species represents an important genetic resource for gene or allele mining to meet future needs. Huge genetic and phenotypic diversity is present in the apple gene pool, even though, breeding programs have been mainly focused on a few traits of interests, which have resulted in the reduction of the diversity in the cultivated lines of apple. Therefore, the present study was carried out on 70 diverse apple genotypes with the objective of analyzing the genetic diversity and to identify the genetic loci associated with important fruit quality traits. A total of 140 SSR primers were used to characterize the 70 genotypes of apples, out of which only 88 SSRs were found to be polymorphic. The PIC values varied from 0.03 to 0.75. The value of MI, EMR, and RP varied from 0.03 to 3.5, 0.5 to 5.0, and 1.89 to 6.74, respectively. The dendrogram and structure analysis divided all the genotypes into two main groups. In addition to this, large phenotypic variability was observed for the fruit quality traits under study indicated the suitability of the genotypes for association studies. Altogether 71 novel MTAs were identified for 10 fruit quality traits, of which 15 for fruit length, 15 for fruit diameter, 12 for fruit weight, 2 for total sugar, 2 for TSS, 4 for reducing sugar, 5 for non-reducing sugar, 5 for fruit firmness, 5 for fruit acidity and 6 for anthocyanin, respectively. Consistent with the physicochemical evaluation of traits, there was a significant correlation coefficient among different fruit quality characters, and many common markers were found to be associated with these traits (fruit diameter, length, TSS, total sugar, acidity and anthocyanin, respectively) by using the different modeling techniques (GLM, MLM). The inferred genetic structure, diversity pattern and the identified MTAs will be serving as resourceful grounds for better predictions and understanding of apple genome towards efficient conservation and utilization of apple germplasm for facilitating genetic improvement of fruit quality traits. Furthermore, these findings also suggested that association mapping could be a viable alternative to the conventional QTL mapping approach in apple. Graphic abstract Supplementary Information The online version contains supplementary material available at 10.1007/s12298-023-01382-w.
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Affiliation(s)
- Poonam
- Department of Biotechnology, Dr YS Parmar University of Horticulture & Forestry, Solan, HP 173 230 India
- School of Bioengineering & Food Technology, Shoolini University, Solan, HP, 173 229, India
| | - Rajnish Sharma
- Department of Biotechnology, Dr YS Parmar University of Horticulture & Forestry, Solan, HP 173 230 India
| | - Parul Sharma
- Department of Biotechnology, Dr YS Parmar University of Horticulture & Forestry, Solan, HP 173 230 India
| | - Naveen C. Sharma
- Department of Fruit Science, Dr YS Parmar University of Horticulture & Forestry, Solan, HP 173 230 India
| | - Kuldeep Kumar
- ICAR-Indian Institute of Pulses Research, Kanpur, UP 208 024 India
| | - Krishna Nand Singh
- Department of Botany, University of Delhi, North Campus, New Delhi, India
| | - Vinay Bhardwaj
- ICAR-Central Potato Research Institute, Shimla, HP 171 004 India
| | - Narender Negi
- ICAR-NBPGR Regional Station, Phagli, Shimla, HP 171 004 India
| | - Neena Chauhan
- RHR&TS, Dr YS Parmar University of Horticulture & Forestry, Mashobra, Shimla, HP, 171 007 India
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5
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Vishwakarma RK, Singh KN. Synthesis of functionalized alkenes via Cu(I)-catalysed allylation of acetanilides using Morita-Baylis-Hillman bromides. Org Biomol Chem 2023; 21:7968-7976. [PMID: 37750359 DOI: 10.1039/d3ob01480k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/27/2023]
Abstract
An easy access to functionalized alkenes has been developed by the C-H functionalization of anilides with Morita-Baylis-Hillman (MBH) bromides in the presence of copper chloride, TBHP and acetic acid. Unsubstituted as well as ortho/meta-substituted anilides exclusively give rise to the para-allylated products, whereas para-substitution brings about the formation of ortho-allylated anilides.
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Affiliation(s)
| | - Krishna Nand Singh
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi-21005, India.
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6
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Kishor K, Prabhakar NS, Singh KN. Visible-Light-Mediated Synthesis of α-Ketoamides via Oxidative Amination of 2-Bromoacetophenones Using Eosin Y as a Photoredox Catalyst. Chem Asian J 2023; 18:e202300669. [PMID: 37642246 DOI: 10.1002/asia.202300669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Revised: 08/26/2023] [Accepted: 08/29/2023] [Indexed: 08/31/2023]
Abstract
An oxidative amination of 2-bromoacetophenones has been accomplished to provide α-ketoamides by using photoredox catalysis with air as oxidant. The reactants are readily accessible, and the method is endowed with broad substrate scope and good functional group tolerance. The practicality of the approach is also shown by a gram-scale reaction.
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Affiliation(s)
- Kaushal Kishor
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi, 221005, India
| | - Neha Sharma Prabhakar
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi, 221005, India
| | - Krishna Nand Singh
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi, 221005, India
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7
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Ishu K, Prabhakar NS, Singh KN. A regioselective synthesis of β-difluoromethoxy vinyl sulfones via O-difluoromethylation of β-ketosulfones using sodium chlorodifluoroacetate. Org Biomol Chem 2023; 21:6588-6594. [PMID: 37528684 DOI: 10.1039/d3ob01142a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/03/2023]
Abstract
A practical synthesis of new β-difluoromethoxy vinyl sulfones has been explored by O-difluoromethylation of β-ketosulfones using the inexpensive and easily workable sodium chlorodifluoroacetate as a difluorocarbene precursor. The strategy is convenient and regioselective, and features an adequate substrate scope and functional group tolerance.
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Affiliation(s)
- Km Ishu
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi-221005, India.
| | - Neha Sharma Prabhakar
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi-221005, India.
| | - Krishna Nand Singh
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi-221005, India.
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8
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Kumar S, Prabhakar NS, Kishor K, Singh KN. Decarboxylative Alkenylation of Imidazo[1,2-a]pyridines using α,β-Unsaturated Carboxylic Acids via Pd-Catalysed C–H Functionalization. SYNTHESIS-STUTTGART 2023. [DOI: 10.1055/a-2067-4041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
Abstract
An efficient synthesis of alkenylated imidazo[1,2-a]pyridines has been accomplished using imidazo[1,2-a]pyridines and α,β-unsaturated carboxylic acids adopting C-H functionalization strategy in the presence of palladium acetate, 1,10-phenanthroline, and silver carbonate.
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Affiliation(s)
- Saurabh Kumar
- Department of Chemistry [Centre of Advanced Study], Banaras Hindu University, Varanasi, India
| | | | - Kaushal Kishor
- Department of Chemistry, Banaras Hindu University, Varanasi, India
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9
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Sharma AK, Chand S, Kumar Pandey A, Singh KN. Easy access to α-carbonyl sulfones using cross-coupling of α-aryl-α-diazoesters with sulfonyl hydrazides. Org Biomol Chem 2023; 21:987-993. [PMID: 36617883 DOI: 10.1039/d2ob02219b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
A facile synthesis of α-carbonyl sulfones has been accomplished by the cross-coupling of α-aryl-α-diazoesters with sulfonyl hydrazides in the presence of CuI and DBU. The reaction employs inexpensive and bench stable sulfonyl hydrazides as a sulfonyl source, and facilitates the migratory insertion with α-aryl-α-diazoesters under mild reaction conditions.
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Affiliation(s)
- Anup Kumar Sharma
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi-221005, India.
| | - Shiv Chand
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi-221005, India.
| | - Anand Kumar Pandey
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi-221005, India.
| | - Krishna Nand Singh
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi-221005, India.
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10
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Pandey AK, Chand S, Sharma AK, Singh KN. Copper-Catalyzed Thiolation of Hydrazones with Sodium Sulfinates: A Straightforward Synthesis of Benzylic Thioethers. J Org Chem 2023; 88:475-482. [PMID: 36520416 DOI: 10.1021/acs.joc.2c02451] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A facile and sustainable protocol for the thiolation of hydrazones with sodium sulfinates has been developed in the presence of CuBr2 and DBU in DMF to afford diverse benzylic thioethers. Control experiments reveal a radical pathway involving a thiyl radical as a key intermediate.
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Affiliation(s)
- Anand Kumar Pandey
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi-221005, India
| | - Shiv Chand
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi-221005, India
| | - Anup Kumar Sharma
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi-221005, India
| | - Krishna Nand Singh
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi-221005, India
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11
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Kumar M, Vishwakarma RK, Wadhwa P, Singh KN. Visible-Light-Mediated C(sp3)–H Functionalization of Alkyl Arylacetates: An Easy Approach to S-Benzyl Dithiocarbamate Acetates. NEW J CHEM 2023. [DOI: 10.1039/d2nj05285g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
An efficient visible light promoted C(sp3)–H functionalization of alkyl arylacetates has been developed using CS2 and amines by eosin Y/I2 dual catalysis to achieve the formation of S-benzyl dithiocarbamate acetates.
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12
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Wadhwa P, Jaiswal A, Kumar M, Singh KN. An Efficient Combinatorial Synthesis of Novel Thiazolidinone‐bis Schiff Base Hybrids Using One‐Pot Multicomponent Reaction. ASIAN J ORG CHEM 2022. [DOI: 10.1002/ajoc.202200629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Preeti Wadhwa
- Banaras Hindu University Faculty of Science Chemistry 221005 Varanasi INDIA
| | - Anjali Jaiswal
- Banaras Hindu University Faculty of Science Chemistry 221005 Varanasi INDIA
| | - Mahesh Kumar
- Banaras Hindu University Faculty of Science Chemistry 221005 Varanasi INDIA
| | - Krishna Nand Singh
- Banaras Hindu University Department of Chemistry Faculty of Science 221005 Varanasi INDIA
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13
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Jaiswal A, Preeti, Singh KN. A convenient synthesis of N-(hetero)arylamides by the oxidative coupling of methylheteroarenes with amines. Org Biomol Chem 2022; 20:6915-6922. [PMID: 35979753 DOI: 10.1039/d2ob01106a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An oxidative amidation of 2-methylpyridines/2-methylbenzimidazole with amines using copper acetate and elemental sulfur in DMSO to afford various N-(hetero)arylamides has been accomplished. Mechanistic studies reveal the intermediacy of N-(pyridin-2-ylmethyl)aniline and confirm the role of DMSO as the oxygen source.
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Affiliation(s)
- Anjali Jaiswal
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India.
| | - Preeti
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India.
| | - Krishna Nand Singh
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India.
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14
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Chand S, Sharma AK, Pandey AK, Singh KN. Visible-Light Photoredox-Catalyzed Synthesis of trans-Oxiranes via Decarboxylative Stereospecific Epoxidation of trans-Cinnamic Acids by Aryldiazonium Salts. Org Lett 2022; 24:6423-6427. [DOI: 10.1021/acs.orglett.2c02509] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Shiv Chand
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India
| | - Anup Kumar Sharma
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India
| | - Anand Kumar Pandey
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India
| | - Krishna Nand Singh
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India
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15
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Prabhakar NS, Kumar S, Gupta PK, Singh KN. Visible-Light-Induced Photocatalytic Trifluoromethylation of Bunte Salts: Easy Access to Trifluoromethylthiolated Synthons. J Org Chem 2022; 87:11112-11120. [PMID: 35939799 DOI: 10.1021/acs.joc.2c01353] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A metal-free visible-light-induced trifluoromethylation of Bunte salts of α-bromoketones/alkyl bromide/benzyl bromides/functionalized allyl (Baylis-Hillman) bromides has been accomplished using Langlois' reagent in the presence of inexpensive eosin Y as a photocatalyst to form the privileged trifluoromethylthiolated synthons. The method is straightforward, operationally simple, and endowed with broad substrate scope and good functional group tolerance.
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Affiliation(s)
- Neha Sharma Prabhakar
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India
| | - Saurabh Kumar
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India
| | - Prince Kumar Gupta
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India
| | - Krishna Nand Singh
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India
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16
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Singh KN, Rawat S, Kumar K, Agarwal SK, Goel S, Jagannath A, Agarwal M. Correction to: Identification of significant marker‑trait associations for Fusarium wilt resistance in a genetically diverse core collection of safflower using AFLP and SSR markers. J Appl Genet 2022; 63:815. [PMID: 35751770 DOI: 10.1007/s13353-022-00709-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - Sapna Rawat
- Department of Botany, University of Delhi, North Campus, Delhi, India
| | - Kuldeep Kumar
- ICAR-Indian Institute of Pulses Research, Kanpur, Uttar Pradesh, India
| | | | - Shailendra Goel
- Department of Botany, University of Delhi, North Campus, Delhi, India.
| | - Arun Jagannath
- Department of Botany, University of Delhi, North Campus, Delhi, India.
| | - Manu Agarwal
- Department of Botany, University of Delhi, North Campus, Delhi, India.
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17
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Singh KN, Rawat S, Kumar K, Agarwal SK, Goel S, Jagannath A, Agarwal M. Identification of significant marker-trait associations for Fusarium wilt resistance in a genetically diverse core collection of safflower using AFLP and SSR markers. J Appl Genet 2022; 63:447-462. [PMID: 35524104 DOI: 10.1007/s13353-022-00694-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 03/30/2022] [Accepted: 04/01/2022] [Indexed: 11/26/2022]
Abstract
Safflower (Carthamus tinctorius L.), an oilseed crop, is severely affected by Fusarium oxysporum f. sp. carthami (Foc), a fungus causing Fusarium wilt (FW) resulting in up to 80% yield loss. In the present study, we used a panel of 84 diverse accessions from the composite core collection to perform association mapping for FW-resistance. Hydroponics-based screening resulted in categorization of 84 accessions as 31 immune, 19 highly resistant, 9 moderately resistant, 4 moderately susceptible, and 21 highly susceptible. Genotyping with a combination of 155 AFLP and 144 SSR markers revealed substantial genetic differentiation and structure analysis identified three main subpopulations (K = 3) with nearly 35% of admixtures in the panel. Kinship analysis at individual and population level revealed absence of or weak relatedness between the accessions. Association mapping with General Linear Model and Mixed Linear Model identified 4 marker-trait associations (MTAs) significantly linked with the FW-resistance trait. Of these, 3 robust MTAs identified in both the models exhibited phenotypic variance ranging from 4.09 to 6.45%. Locus-128 showing a low P-value and high phenotypic variance was identified as a promising marker-trait association that will facilitate marker-assisted breeding for FW-resistance in safflower.
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Affiliation(s)
| | - Sapna Rawat
- Department of Botany, University of Delhi, North Campus, Delhi, India
| | - Kuldeep Kumar
- ICAR-Indian Institute of Pulses Research, Kanpur, Uttar Pradesh, India
| | | | - Shailendra Goel
- Department of Botany, University of Delhi, North Campus, Delhi, India.
| | - Arun Jagannath
- Department of Botany, University of Delhi, North Campus, Delhi, India.
| | - Manu Agarwal
- Department of Botany, University of Delhi, North Campus, Delhi, India.
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18
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Pandey AK, Chand S, Sharma AK, Singh KN. Iodine Catalyzed Sulfenylation of Sodium Sulfinates using Arenediazonium Tetrafluoroborate/CS2 Combination. ASIAN J ORG CHEM 2022. [DOI: 10.1002/ajoc.202200173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Anand Kumar Pandey
- Banaras Hindu University Faculty of Science Chemistry Institute of Science 221005 Varanasi INDIA
| | - Shiv Chand
- Banaras Hindu University Faculty of Science Chemistry Institute of Science 221005 Varanasi INDIA
| | - Anup Kumar Sharma
- Banaras Hindu University Faculty of Science Chemistry Institute of Science 221005 Varanasi INDIA
| | - Krishna Nand Singh
- Banaras Hindu University Department of Chemistry Faculty of Science 221005 Varanasi INDIA
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19
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Preeti, Kumar M, Jaiswal A, Nand Singh K. Microwave‐Assisted Diversity‐Oriented Synthesis of Thiazol‐2(
3H
)‐ones and Its Interaction with Biomacromolecules. ASIAN J ORG CHEM 2022. [DOI: 10.1002/ajoc.202100389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Preeti
- Department of Chemistry, Institute of Science Banaras Hindu University Varanasi 221005 India
| | - Mahesh Kumar
- Department of Chemistry, Institute of Science Banaras Hindu University Varanasi 221005 India
| | - Anjali Jaiswal
- Department of Chemistry, Institute of Science Banaras Hindu University Varanasi 221005 India
| | - Krishna Nand Singh
- Department of Chemistry, Institute of Science Banaras Hindu University Varanasi 221005 India
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20
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Sharma AK, Jaiswal A, Chand S, Singh KN. Domino Reaction of Isatins with
α
‐Oxoketene‐
N
,
S
‐acetals: An Efficient Synthesis of Pyrrolo[3,4‐
c
]quinoline‐1,3‐diones and 2,3‐Dihydro‐1
H
‐pyrrolo[3,4‐
c
]quinolin‐1‐ones. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100489] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Anup Kumar Sharma
- Department of Chemistry Institute of Science Banaras Hindu University Varanasi 221005 India
| | - Anjali Jaiswal
- Department of Chemistry Institute of Science Banaras Hindu University Varanasi 221005 India
| | - Shiv Chand
- Department of Chemistry Institute of Science Banaras Hindu University Varanasi 221005 India
| | - Krishna Nand Singh
- Department of Chemistry Institute of Science Banaras Hindu University Varanasi 221005 India
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21
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Jaiswal A, Sharma AK, Preeti, Singh KN. Copper‐Catalyzed Decarboxylative Synthesis of α‐Ketothioamides Using α,β‐Unsaturated Arylcarboxylic Acids, Alicyclic Secondary Amines and Elemental Sulfur. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100203] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Anjali Jaiswal
- Department of Chemistry Institute of Science Banaras Hindu University Varanasi 221005 India
| | - Anup Kumar Sharma
- Department of Chemistry Institute of Science Banaras Hindu University Varanasi 221005 India
| | - Preeti
- Department of Chemistry Institute of Science Banaras Hindu University Varanasi 221005 India
| | - Krishna Nand Singh
- Department of Chemistry Institute of Science Banaras Hindu University Varanasi 221005 India
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22
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Vishwakarma RK, Kumar S, Singh KN. Visible-Light-Induced Photocatalytic Synthesis of β-Keto Dithiocarbamates via Difunctionalization of Styrenes. Org Lett 2021; 23:4147-4151. [PMID: 33988029 DOI: 10.1021/acs.orglett.1c01059] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A facile photocatalyzed strategy for difunctionalization of styrenes in the presence of CS2 and amines providing β-keto dithiocarbamates has been developed. In the case of 4-nitrostyrene and 2-vinylpyridine, however, only 2-arylethylthiocarbamates are interestingly formed without the aid of photoredox catalysis/TBHP.
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Affiliation(s)
| | - Saurabh Kumar
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India
| | - Krishna Nand Singh
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India
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23
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Chand S, Pandey AK, Singh R, Singh KN. Visible-Light-Induced Photocatalytic Oxidative Decarboxylation of Cinnamic Acids to 1,2-Diketones. J Org Chem 2021; 86:6486-6493. [PMID: 33851837 DOI: 10.1021/acs.joc.1c00322] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A concerted metallophotoredox catalysis has been realized for the efficient decarboxylative functionalization of α,β-unsaturated carboxylic acids with aryl iodides in the presence of perylene bisimide dye to afford 1,2-diketones.
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Affiliation(s)
- Shiv Chand
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India
| | - Anand Kumar Pandey
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India
| | - Rahul Singh
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India
| | - Krishna Nand Singh
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India
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24
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Roy S, Das SK, Khatua H, Das S, Singh KN, Chattopadhyay B. Iron‐Catalyzed Radical Activation Mechanism for Denitrogenative Rearrangement Over C(sp
3
)–H Amination. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202014950] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Satyajit Roy
- Division of Molecular Synthesis & Drug Discovery, Centre of Bio-Medical Research (CBMR) SGPGIMS Campus Raebareli Road Lucknow 226014 U.P. India
- Department of Chemistry, Institute of Science Banaras Hindu University Varanasi 221005 India
| | - Sandip Kumar Das
- Division of Molecular Synthesis & Drug Discovery, Centre of Bio-Medical Research (CBMR) SGPGIMS Campus Raebareli Road Lucknow 226014 U.P. India
| | - Hillol Khatua
- Division of Molecular Synthesis & Drug Discovery, Centre of Bio-Medical Research (CBMR) SGPGIMS Campus Raebareli Road Lucknow 226014 U.P. India
| | - Subrata Das
- Division of Molecular Synthesis & Drug Discovery, Centre of Bio-Medical Research (CBMR) SGPGIMS Campus Raebareli Road Lucknow 226014 U.P. India
| | - Krishna Nand Singh
- Department of Chemistry, Institute of Science Banaras Hindu University Varanasi 221005 India
| | - Buddhadeb Chattopadhyay
- Division of Molecular Synthesis & Drug Discovery, Centre of Bio-Medical Research (CBMR) SGPGIMS Campus Raebareli Road Lucknow 226014 U.P. India
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25
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Roy S, Das SK, Khatua H, Das S, Singh KN, Chattopadhyay B. Iron-Catalyzed Radical Activation Mechanism for Denitrogenative Rearrangement Over C(sp 3 )-H Amination. Angew Chem Int Ed Engl 2021; 60:8772-8780. [PMID: 33463874 DOI: 10.1002/anie.202014950] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Revised: 01/05/2021] [Indexed: 11/11/2022]
Abstract
An iron-catalyzed denitrogenative rearrangement of 1,2,3,4-tetrazole is developed over the competitive C(sp3 )-H amination. This catalytic rearrangement reaction follows an unprecedented metalloradical activation mechanism. Employing the developed method, a wide number of complex-N-heterocyclic product classes have been accessed. The synthetic utility of this radical activation method is showcased with the short synthesis of a bioactive molecule. Collectively, this discovery underlines the progress of radical activation strategy that should find wide application in the perspective of medicinal chemistry, drug discovery and natural product synthesis research.
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Affiliation(s)
- Satyajit Roy
- Division of Molecular Synthesis & Drug Discovery, Centre of Bio-Medical Research (CBMR), SGPGIMS Campus, Raebareli Road, Lucknow, 226014, U.P., India.,Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi, 221005, India
| | - Sandip Kumar Das
- Division of Molecular Synthesis & Drug Discovery, Centre of Bio-Medical Research (CBMR), SGPGIMS Campus, Raebareli Road, Lucknow, 226014, U.P., India
| | - Hillol Khatua
- Division of Molecular Synthesis & Drug Discovery, Centre of Bio-Medical Research (CBMR), SGPGIMS Campus, Raebareli Road, Lucknow, 226014, U.P., India
| | - Subrata Das
- Division of Molecular Synthesis & Drug Discovery, Centre of Bio-Medical Research (CBMR), SGPGIMS Campus, Raebareli Road, Lucknow, 226014, U.P., India
| | - Krishna Nand Singh
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi, 221005, India
| | - Buddhadeb Chattopadhyay
- Division of Molecular Synthesis & Drug Discovery, Centre of Bio-Medical Research (CBMR), SGPGIMS Campus, Raebareli Road, Lucknow, 226014, U.P., India
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26
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Abstract
The advent of multicomponent reactions in the synthesis of heterocycles and their ever burgeoning applications in drug development, materials chemistry, and catalysis, have attracted a great deal of current scientific interest. In particular, the metal-free multicomponent synthesis of six membered N-heterocycles has undergone intensive research over the last two decades offering an environmentally benevolent means contrary to traditional metal catalysed reactions. To the best of our knowledge, there exists no exclusive review on the metal-free multicomponent synthesis of six membered N-heterocyles, and hence the present report highlights the progress on metal-free multicomponent reactions with their advantages and mechanistic insights to access monocyclic six-membered N-heterocycles including pyridine, pyrimidine, pyrazine, triazine and their hydrogenated derivatives. The literature is covered since 2000, and the contents offer not only striking methods for divergent synthesis of six-membered N-heterocycles but also put forward some new insights into the exploration of metal-free multicomponent chemistry.
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Affiliation(s)
- Preeti
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi-221005, India.
| | - Krishna Nand Singh
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi-221005, India.
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27
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Gupta PK, Yadav AK, Sharma AK, Singh KN. Iodine-catalyzed thioallylation of indoles using Bunte salts prepared from Baylis-Hillman bromides. Org Biomol Chem 2021; 19:3484-3488. [PMID: 33899895 DOI: 10.1039/d1ob00377a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Metal-free iodine-catalyzed regioselective thioallylation of indoles has been accomplished at room temperature using Bunte salts prepared from Baylis-Hillman bromides. The resulting multi-functional C3 thioallylated indoles exhibit ample structural diversity and good functional group tolerance.
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Affiliation(s)
- Prince Kumar Gupta
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India.
| | - Arvind Kumar Yadav
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India.
| | - Anup Kumar Sharma
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India.
| | - Krishna Nand Singh
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India.
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28
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Affiliation(s)
- Prince Kumar Gupta
- Department of Chemistry (Centre of Advanced Study)Institute of ScienceBanaras Hindu University Varanasi 221005 India
| | - Arvind Kumar Yadav
- Department of Chemistry (Centre of Advanced Study)Institute of ScienceBanaras Hindu University Varanasi 221005 India
- Department of ChemistryBRD PG College Deoria 274001 India
| | - Krishna Nand Singh
- Department of Chemistry (Centre of Advanced Study)Institute of ScienceBanaras Hindu University Varanasi 221005 India
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29
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Pandey A, Chand S, Singh R, Kumar S, Singh KN. Iodine-Catalyzed Synthesis of 3-Arylthioindoles Employing a 1-Aryltriazene/CS 2 Combination as a New Sulfenylation Source. ACS Omega 2020; 5:7627-7635. [PMID: 32280906 PMCID: PMC7144174 DOI: 10.1021/acsomega.0c00472] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/03/2020] [Accepted: 03/13/2020] [Indexed: 06/11/2023]
Abstract
A practical approach for the regioselective synthesis of 3-arylthioindoles has been accomplished using a combination of 1-aryltriazene/CS2 as a new sulfenylation source. The methodology employs molecular iodine as a catalyst and is compatible with a variety of structurally diverse reactants.
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30
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Jaiswal A, Sharma AK, Singh KN. Synthesis of 3-acylindoles via copper-mediated oxidative decarbethoxylation of ethyl arylacetates. Org Biomol Chem 2020; 18:1623-1628. [PMID: 32037416 DOI: 10.1039/c9ob02550b] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient regioselective C-3 acylation of free indoles (N-H) has been accomplished via oxidative decarbethoxylation of easily available ethyl arylacetates using Cu(OAc)2 and KOtBu in DMSO.
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Affiliation(s)
- Anjali Jaiswal
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India.
| | - Anup Kumar Sharma
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India.
| | - Krishna Nand Singh
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India.
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31
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Kumari K, Kumar S, Singh KN, Drew MGB, Singh N. Synthesis and characterization of new square planar heteroleptic cationic complexes [Ni(ii) β-oxodithioester-dppe]+; their use as a catalyst for Chan–Lam coupling. NEW J CHEM 2020. [DOI: 10.1039/d0nj01139h] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Six new structurally characterized heteroleptic cationic [Ni(ii) β-oxodithioester-dppe]+PF6− complexes as efficient catalysts for Chan–Lam coupling reaction affording N-arylated products with significant functional group tolerance.
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Affiliation(s)
- Kavita Kumari
- Department of Chemistry
- Institute of Science
- Banaras Hindu University
- Varanasi 221005
- India
| | - Saurabh Kumar
- Department of Chemistry
- Institute of Science
- Banaras Hindu University
- Varanasi 221005
- India
| | - Krishna Nand Singh
- Department of Chemistry
- Institute of Science
- Banaras Hindu University
- Varanasi 221005
- India
| | - Michael G. B. Drew
- Department of Chemistry
- University of Reading Whiteknights
- Reading RG6 6AD
- UK
| | - Nanhai Singh
- Department of Chemistry
- Institute of Science
- Banaras Hindu University
- Varanasi 221005
- India
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32
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Chand S, Pandey AK, Singh R, Kumar S, Singh KN. Eosin‐Y‐Catalyzed Photoredox C−S Bond Formation: Easy Access to Thioethers. Chem Asian J 2019; 14:4712-4716. [DOI: 10.1002/asia.201901060] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2019] [Revised: 09/03/2019] [Indexed: 01/07/2023]
Affiliation(s)
- Shiv Chand
- Department of Chemistry (Centre of Advanced Study), Institute of ScienceBanaras Hindu University Varanasi 221005 India
| | - Anand Kumar Pandey
- Department of Chemistry (Centre of Advanced Study), Institute of ScienceBanaras Hindu University Varanasi 221005 India
| | - Rahul Singh
- Department of Chemistry (Centre of Advanced Study), Institute of ScienceBanaras Hindu University Varanasi 221005 India
| | - Saurabh Kumar
- Department of Chemistry (Centre of Advanced Study), Institute of ScienceBanaras Hindu University Varanasi 221005 India
| | - Krishna Nand Singh
- Department of Chemistry (Centre of Advanced Study), Institute of ScienceBanaras Hindu University Varanasi 221005 India
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33
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Affiliation(s)
- Narendra R. Chaubey
- Department of Chemistry, Institute of ScienceBanaras Hindu University Varanasi 221005 India >Varanasi 221005, <country
| | - Ramesh Kumar Vishwakarma
- Department of Chemistry, Institute of ScienceBanaras Hindu University Varanasi 221005 India >Varanasi 221005, <country
| | - Krishna Nand Singh
- Department of Chemistry, Institute of ScienceBanaras Hindu University Varanasi 221005 India >Varanasi 221005, <country
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34
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Sharma AK, Kumar P, Vishwakarma RK, Singh KN. Visible‐Light‐Enabled Synthesis of Pyridyl Benzamides via Oxidative Decarbethoxylation using Copper(I) Iodide/Air at Room Temperature. ASIAN J ORG CHEM 2019. [DOI: 10.1002/ajoc.201900146] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Anup Kumar Sharma
- Department of Chemistry (Centre of advanced Study) Institution of ScienceBanaras Hindu University Varanasi 221005 India
| | - Promod Kumar
- Department of Chemistry (Centre of advanced Study) Institution of ScienceBanaras Hindu University Varanasi 221005 India
| | - Ramesh Kumar Vishwakarma
- Department of Chemistry (Centre of advanced Study) Institution of ScienceBanaras Hindu University Varanasi 221005 India
| | - Krishna Nand Singh
- Department of Chemistry (Centre of advanced Study) Institution of ScienceBanaras Hindu University Varanasi 221005 India
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35
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Vishwakarma RK, Kumar S, Sharma AK, Singh R, Singh KN. An Efficient Synthesis of 1,2‐Diketones by Oxidative Cross‐coupling of Alkynes and Aryl Triazenes using Copper Catalysis. ChemistrySelect 2019. [DOI: 10.1002/slct.201901002] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Ramesh Kumar Vishwakarma
- Department of Chemistry (Centre of Advanced Study)Institute of ScienceBanaras Hindu University Varanasi 221005 India
| | - Saurabh Kumar
- Department of Chemistry (Centre of Advanced Study)Institute of ScienceBanaras Hindu University Varanasi 221005 India
| | - Anup Kumar Sharma
- Department of Chemistry (Centre of Advanced Study)Institute of ScienceBanaras Hindu University Varanasi 221005 India
| | - Rahul Singh
- Department of Chemistry (Centre of Advanced Study)Institute of ScienceBanaras Hindu University Varanasi 221005 India
| | - Krishna Nand Singh
- Department of Chemistry (Centre of Advanced Study)Institute of ScienceBanaras Hindu University Varanasi 221005 India
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36
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Sharma AK, Yadav AK, Singh KN. Corrigendum: Silver-Catalyzed Decarboxylative Trifluoromethylation of Cinnamic Acids: Easy Access to α-Trifluoromethylated Ketones. ASIAN J ORG CHEM 2019. [DOI: 10.1002/ajoc.201800589] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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37
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Affiliation(s)
- Shiv Chand
- Department of Chemistry (Centre of Advanced Study)Institute of ScienceBanaras Hindu University Varanasi 221005 India
| | - Saurabh Kumar
- Department of Chemistry (Centre of Advanced Study)Institute of ScienceBanaras Hindu University Varanasi 221005 India
| | - Rahul Singh
- Department of Chemistry (Centre of Advanced Study)Institute of ScienceBanaras Hindu University Varanasi 221005 India
| | - Krishna Nand Singh
- Department of Chemistry (Centre of Advanced Study)Institute of ScienceBanaras Hindu University Varanasi 221005 India
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38
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Yadav AK, Sharma AK, Singh KN. Visible light enabled γ-trifluoromethylation of Baylis–Hillman acetates: stereoselective synthesis of trisubstituted alkenes. Org Chem Front 2019. [DOI: 10.1039/c9qo00166b] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Metal-free γ-trifluoromethylation of Baylis–Hillman acetates is reported using Langlois’ reagent under visible light photoredox catalysis.
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Affiliation(s)
- Arvind Kumar Yadav
- Department of Chemistry (Centre of Advanced Study)
- Institute of Science
- Banaras Hindu University
- Varanasi-221005
- India
| | - Anup Kumar Sharma
- Department of Chemistry (Centre of Advanced Study)
- Institute of Science
- Banaras Hindu University
- Varanasi-221005
- India
| | - Krishna Nand Singh
- Department of Chemistry (Centre of Advanced Study)
- Institute of Science
- Banaras Hindu University
- Varanasi-221005
- India
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39
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Abstract
A regioselective multicomponent approach to sulfonamide–thiazolidinone hybrids has been developed.
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Affiliation(s)
- Preeti Preeti
- Department of Chemistry (Centre of Advanced Study)
- Institute of Science
- Banaras Hindu University
- Varanasi-221005
- India
| | - Krishna Nand Singh
- Department of Chemistry (Centre of Advanced Study)
- Institute of Science
- Banaras Hindu University
- Varanasi-221005
- India
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40
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Sharma AK, Jaiswal A, Singh KN. Cu-Catalysed oxidative amidation of cinnamic acids/arylacetic acids with 2° amines: an efficient synthesis of α-ketoamides. Org Biomol Chem 2019; 17:9348-9351. [DOI: 10.1039/c9ob02045d] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Copper-catalysed decarboxylation/oxidative amidation of cinnamic acids and oxidative amidation of arylacetic acids with 2° amines have been developed leading to the formation of α-ketoamides.
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Affiliation(s)
- Anup Kumar Sharma
- Department of Chemistry
- Institute of Science
- Banaras Hindu University
- Varanasi 221005
- India
| | - Anjali Jaiswal
- Department of Chemistry
- Institute of Science
- Banaras Hindu University
- Varanasi 221005
- India
| | - Krishna Nand Singh
- Department of Chemistry
- Institute of Science
- Banaras Hindu University
- Varanasi 221005
- India
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41
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Yadav AK, Singh KN. Retraction: Visible-light-induced oxidative difunctionalization of styrenes: synthesis of α-trifluoromethylthio-substituted ketones. Chem Commun (Camb) 2019; 55:13777. [DOI: 10.1039/c9cc90479d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Retraction of ‘Visible-light-induced oxidative difunctionalization of styrenes: synthesis of α-trifluoromethylthio-substituted ketones’ by Arvind Kumar Yadav et al., Chem. Commun., 2018, 54, 1976–1979.
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Affiliation(s)
- Arvind Kumar Yadav
- Department of Chemistry (Centre of Advanced Study)
- Institute of Science
- Banaras Hindu University
- Varanasi-221005
- India
| | - Krishna Nand Singh
- Department of Chemistry (Centre of Advanced Study)
- Institute of Science
- Banaras Hindu University
- Varanasi-221005
- India
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42
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Sharma S, Varghese E, Arora A, Singh KN, Singh S, Nain L, Paul D. Corrigendum: Augmenting Pentose Utilization and Ethanol Production of Native Saccharomyces Cerevisiae LN Using Medium Engineering and Response Surface Methodology. Front Bioeng Biotechnol 2018; 6:168. [PMID: 30464938 PMCID: PMC6243195 DOI: 10.3389/fbioe.2018.00168] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Accepted: 10/24/2018] [Indexed: 11/13/2022] Open
Affiliation(s)
- Shalley Sharma
- Division of Microbiology, ICAR-Indian Agricultural Research Institute, New Delhi, India
| | - Eldho Varghese
- ICAR-Indian Agricultural Statistics Research Institute, New Delhi, India
| | - Anju Arora
- Division of Microbiology, ICAR-Indian Agricultural Research Institute, New Delhi, India
| | - K N Singh
- ICAR-Indian Agricultural Statistics Research Institute, New Delhi, India
| | - Surender Singh
- Division of Microbiology, ICAR-Indian Agricultural Research Institute, New Delhi, India
| | - Lata Nain
- Division of Microbiology, ICAR-Indian Agricultural Research Institute, New Delhi, India
| | - Debarati Paul
- Amity Institute of Biotechnology, Amity University, Noida, India
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43
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Kumar S, Kumar Pandey A, Singh R, Nand Singh K. Decarboxylative Arylation of α,β-Unsaturated Carboxylic Acids Using Aryl Triazenes by Copper/Ionic Liquid Combination in PEG-400. European J Org Chem 2018. [DOI: 10.1002/ejoc.201800930] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Saurabh Kumar
- Department of Chemistry (Centre of Advanced Study); Institute of Science; Banaras Hindu University; 221005 Varanasi India
| | - Anand Kumar Pandey
- Department of Chemistry (Centre of Advanced Study); Institute of Science; Banaras Hindu University; 221005 Varanasi India
| | - Rahul Singh
- Department of Chemistry (Centre of Advanced Study); Institute of Science; Banaras Hindu University; 221005 Varanasi India
| | - Krishna Nand Singh
- Department of Chemistry (Centre of Advanced Study); Institute of Science; Banaras Hindu University; 221005 Varanasi India
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Pandey AK, Kumar S, Singh R, Singh KN. A practical synthesis of aryl sulfones via cross-coupling of sulfonyl hydrazides with aryltriazenes using copper/ionic liquid combination. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.09.059] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Sharma S, Varghese E, Arora A, Singh KN, Singh S, Nain L, Paul D. Augmenting Pentose Utilization and Ethanol Production of Native Saccharomyces cerevisiae LN Using Medium Engineering and Response Surface Methodology. Front Bioeng Biotechnol 2018; 6:132. [PMID: 30320081 PMCID: PMC6166573 DOI: 10.3389/fbioe.2018.00132] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Accepted: 09/04/2018] [Indexed: 12/31/2022] Open
Abstract
Economics of ethanol production from lignocellulosic biomass depends on complete utilization of constituent carbohydrates and efficient fermentation of mixed sugars present in biomass hydrolysates. Saccharomyces cerevisiae, the commercial strain for ethanol production uses only glucose while pentoses remain unused. Recombinant strains capable of utilizing pentoses have been engineered but with limited success. Recently, presence of endogenous pentose assimilation pathway in S. cerevisiae was reported. On the contrary, evolutionary engineering of native xylose assimilating strains is promising approach. In this study, a native strain S. cerevisiae LN, isolated from fruit juice, was found to be capable of xylose assimilation and mixed sugar fermentation. Upon supplementation with yeast extract and peptone, glucose (10%) fermentation efficiency was 78% with ~90% sugar consumption. Medium engineering augmented mixed sugars (5% glucose + 5% xylose) fermentation efficiency to ~50 and 1.6% ethanol yield was obtained with concomitant sugar consumption ~60%. Statistical optimization of input variables Glucose (5.36%), Xylose (3.30%), YE (0.36%), and peptone (0.25%) with Response surface methodology led to improved sugar consumption (74.33%) and 2.36% ethanol within 84 h. Specific activities of Xylose Reductase and Xylitol Dehydrogenase exhibited by S. cerevisiae LN were relatively low. Their ratio indicated metabolism diverted toward ethanol than xylitol and other byproducts. Strain was tolerant to concentrations of HMF, furfural and acetic acid commonly encountered in biomass hydrolysates. Thus, genetic setup for xylose assimilation in S. cerevisiae LN is not merely artifact of xylose metabolizing pathway and can be augmented by adaptive evolution. This strain showed potential for commercial exploitation.
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Affiliation(s)
- Shalley Sharma
- Division of Microbiology, ICAR-Indian Agricultural Research Institute, New Delhi, India
| | - Eldho Varghese
- ICAR-Indian Agricultural Statistics Research Institute, New Delhi, India
| | - Anju Arora
- Division of Microbiology, ICAR-Indian Agricultural Research Institute, New Delhi, India
| | - K N Singh
- ICAR-Indian Agricultural Statistics Research Institute, New Delhi, India
| | - Surender Singh
- Division of Microbiology, ICAR-Indian Agricultural Research Institute, New Delhi, India
| | - Lata Nain
- Division of Microbiology, ICAR-Indian Agricultural Research Institute, New Delhi, India
| | - Debarati Paul
- Amity Institute of Biotechnology, Amity University, Noida, India
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Sharma AK, Yadav AK, Singh KN. Silver-Catalyzed Decarboxylative Trifluoromethylthiolation of Cinnamic Acids: An Easy Access to α-Trifluoromethylthiolated Ketones. ASIAN J ORG CHEM 2018. [DOI: 10.1002/ajoc.201800327] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Anup Kumar Sharma
- Department of Chemistry; Centre of Advanced Study); Institute of Science; Banaras Hindu University; Varanasi 221005 India
| | - Arvind Kumar Yadav
- Department of Chemistry; Centre of Advanced Study); Institute of Science; Banaras Hindu University; Varanasi 221005 India
| | - Krishna Nand Singh
- Department of Chemistry; Centre of Advanced Study); Institute of Science; Banaras Hindu University; Varanasi 221005 India
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Yadav AK, Singh KN. Visible-light-induced oxidative difunctionalization of styrenes: synthesis of α-trifluoromethylthio-substituted ketones. Chem Commun (Camb) 2018; 54:1976-1979. [PMID: 29400384 DOI: 10.1039/c7cc09953c] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel and practical synthesis of α-trifluoromethylthio-substituted ketones has been accomplished through the visible-light-induced aerobic oxidation of styrenes. The protocol employs the combination of CF3SO2Na and CS2 as a new source of SCF3 radicals in the presence of eosin Y as a photoredox catalyst.
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Affiliation(s)
- Arvind Kumar Yadav
- Department of Chemistry (Centre of Advanced Study), Institute of Science, Banaras Hindu University, Varanasi-221005, India.
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Sharma AK, Kumar P, Vishwakarma RK, Singh KN. Transition-Metal-Free Cross-Dehydrogenative Coupling of Ethyl Arylacetates with Benzoic/Cinnamic Acids: A Practical Synthesis of α-Acyloxy Esters. ASIAN J ORG CHEM 2018. [DOI: 10.1002/ajoc.201800029] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Anup Kumar Sharma
- Department of Chemistry (Centre of Advanced Study), Institute of Science; Banaras Hindu University; Varanasi 221005 India
| | - Promod Kumar
- Department of Chemistry (Centre of Advanced Study), Institute of Science; Banaras Hindu University; Varanasi 221005 India
| | - Ramesh Kumar Vishwakarma
- Department of Chemistry (Centre of Advanced Study), Institute of Science; Banaras Hindu University; Varanasi 221005 India
| | - Krishna Nand Singh
- Department of Chemistry (Centre of Advanced Study), Institute of Science; Banaras Hindu University; Varanasi 221005 India
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Kumar P, Sharma AK, Guntreddi T, Singh R, Singh KN. Transition-Metal-Free Regiospecific Aroylation of Nitroarenes Using Ethyl Arylacetates at Room Temperature. Org Lett 2018; 20:744-747. [PMID: 29345475 DOI: 10.1021/acs.orglett.7b03882] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
A novel regiospecific C(sp3)-C(sp2) coupling between ethyl arylacetates and nitroarenes has been developed to deliver biaryl ketones in excellent yields. The protocol is metal-free, mild, and compatible with a number of functional groups on both of the reacting partners.
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Affiliation(s)
- Promod Kumar
- Department of Chemistry (Centre of Advanced Study), Institute of Science, Banaras Hindu University , Varanasi-221005, India
| | - Anup Kumar Sharma
- Department of Chemistry (Centre of Advanced Study), Institute of Science, Banaras Hindu University , Varanasi-221005, India
| | - Tirumaleswararao Guntreddi
- Department of Chemistry (Centre of Advanced Study), Institute of Science, Banaras Hindu University , Varanasi-221005, India
| | - Rahul Singh
- Department of Chemistry (Centre of Advanced Study), Institute of Science, Banaras Hindu University , Varanasi-221005, India
| | - Krishna Nand Singh
- Department of Chemistry (Centre of Advanced Study), Institute of Science, Banaras Hindu University , Varanasi-221005, India
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Kumar S, Singh R, Singh KN. AIBN-Initiated Denitrative Cross-Coupling Reactions of β-Nitrostyrenes with Sulfonyl Hydrazides/Disulfides: A Metal-free Approach towards Vinyl Sulfones. ASIAN J ORG CHEM 2018. [DOI: 10.1002/ajoc.201700632] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Saurabh Kumar
- Department of Chemistry (Centre of Advanced Study), Institute of Science; Banaras Hindu University; Varanasi 221005 India
| | - Rahul Singh
- Department of Chemistry (Centre of Advanced Study), Institute of Science; Banaras Hindu University; Varanasi 221005 India
| | - Krishna Nand Singh
- Department of Chemistry (Centre of Advanced Study), Institute of Science; Banaras Hindu University; Varanasi 221005 India
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