1
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Wang X, Luo Y, Zhao J, Luo S. CPA-catalyzed asymmetric domino thia-Michael/aldol reactions for simultaneous chiral center and axial chirality formation. Org Biomol Chem 2023; 21:6697-6701. [PMID: 37554057 DOI: 10.1039/d3ob01087b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/10/2023]
Abstract
A highly enantio- and diastereoselective domino thia-Michael/aldol reaction applying 5H-dibenzo[a,c][7]annulen-5-one as a Michael acceptor, catalyzed by a chiral phosphoric acid (CPA), has been developed. The bridged biaryl adduct contains multiple stereogenic centers in the bridging linkage as well as a thermodynamically controlled stereogenic axis. The energy difference between the two atropodiastereomers is about 9.1 kcal mol-1, which accounts for the observed excellent diastereoselectivity (>20 : 1).
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Affiliation(s)
- Xilong Wang
- State Key Laboratory of Respiratory Disease, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, 190 Kaiyuan Avenue, Guangzhou 510530, China.
- University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Shijingshan District, Beijing, 100049, China
| | - Yu Luo
- State Key Laboratory of Respiratory Disease, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, 190 Kaiyuan Avenue, Guangzhou 510530, China.
- University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Shijingshan District, Beijing, 100049, China
| | - Jiaji Zhao
- School of Medicine and Chemical Engineering, Guangdong Pharmaceutical University, Zhongshan 528400, China.
| | - Shuang Luo
- State Key Laboratory of Respiratory Disease, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, 190 Kaiyuan Avenue, Guangzhou 510530, China.
- University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Shijingshan District, Beijing, 100049, China
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2
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Sharma S, Monga Y, Gupta A, Singh S. 2-Oxindole and related heterocycles: synthetic methodologies for their natural products and related derivatives. RSC Adv 2023; 13:14249-14267. [PMID: 37179999 PMCID: PMC10173257 DOI: 10.1039/d3ra02217j] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Accepted: 04/25/2023] [Indexed: 05/15/2023] Open
Abstract
Natural goods, medications, and pharmaceutically active substances all contain substituted oxindoles. Generally, the C-3 stereocenter of the substituents of oxindoles and their absolute arrangement have a substantial impact on the bioactivity of these substances. In this case, the desire for contemporary probe and drug-discovery programs for the synthesis of chiral compounds using desirable scaffolds with high structural diversity further drives research in this field. Also, the new synthetic techniques are generally simple to apply for the synthesis of other similar scaffolds. Herein, we review the distinct approaches for the synthesis of diverse useful oxindole scaffolds. Specifically, the research findings on the naturally existing 2-oxindole core and a variety of synthetic compounds having a 2-oxindole core are discussed. We present an overview of the construction of oxindole-based synthetic and natural products. In addition, the chemical reactivity of 2-oxindole and its related derivatives in the presence of chiral and achiral catalysts are thoroughly discussed. The data compiled herein provides broad information related to the bioactive product design, development, and applications of 2-oxindoles and the reported techniques will be helpful for the investigation of novel reactions in the future.
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Affiliation(s)
- Shivangi Sharma
- Department of Applied Chemistry, Amity School of Engineering and Technology, Amity University Madhya Pradesh Gwalior Madhya Pradesh-474 005 India
| | - Yukti Monga
- Shyamlal College, Department of Chemistry, University of Delhi Delhi-110032 India
| | - Ashu Gupta
- Shyamlal College, Department of Chemistry, University of Delhi Delhi-110032 India
| | - Shivendra Singh
- Department of Applied Chemistry, Amity School of Engineering and Technology, Amity University Madhya Pradesh Gwalior Madhya Pradesh-474 005 India
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3
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Yang L, Zhou S, Zhao JQ, You Y, Wang ZH, Zhou MQ, Yuan WC. A cascade deprotonation/intramolecular aldol reaction of α-carbonyl sulfonium ylides with 2-mercaptoindole-3-carbaldehydes and 2-mercaptobenzaldehydes to access thieno[2,3- b]indoles and benzothiophenes. Org Biomol Chem 2021; 19:3678-3686. [PMID: 33908551 DOI: 10.1039/d1ob00349f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first catalyst-free cascade deprotonation/intramolecular aldol reaction of α-carbonyl sulfonium ylides with 2-mercaptoindole-3-carbaldehydes and 2-mercaptobenzaldehydes was developed. A series of thieno[2,3-b]indoles and benzothiophenes were smoothly obtained in high to excellent yields. The salient features of the protocol include catalyst-free conditions, an environment-friendly solvent, broad substrate scope, and large-scale synthesis.
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Affiliation(s)
- Lei Yang
- National Engineering Research Center of Chiral Drugs, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu, 610041, China and Institute for Advanced Study, Chengdu University, Chengdu 610106, China. and University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Shun Zhou
- National Engineering Research Center of Chiral Drugs, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu, 610041, China and Institute for Advanced Study, Chengdu University, Chengdu 610106, China. and University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Jian-Qiang Zhao
- Institute for Advanced Study, Chengdu University, Chengdu 610106, China.
| | - Yong You
- Institute for Advanced Study, Chengdu University, Chengdu 610106, China.
| | - Zhen-Hua Wang
- Institute for Advanced Study, Chengdu University, Chengdu 610106, China.
| | - Ming-Qiang Zhou
- National Engineering Research Center of Chiral Drugs, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu, 610041, China
| | - Wei-Cheng Yuan
- Institute for Advanced Study, Chengdu University, Chengdu 610106, China.
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4
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Yang L, Zhao JQ, You Y, Wang ZH, Yuan WC. Organocatalytic enantioselective tandem sulfa-Michael/aldol reaction to access dihydrothiopyran-fused benzosulfolane skeletons bearing three contiguous stereocenters. Chem Commun (Camb) 2020; 56:12363-12366. [PMID: 32930199 DOI: 10.1039/d0cc04840b] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The first organocatalytic diastereo- and enantioselective tandem sulfa-Michael/aldol reaction of 2-mercaptoindole-3-carbaldehydes and 2-mercaptobenzaldehydes with benzo[b]thiophene sulfones was developed. With multiple hydrogen-bonding thiourea as a catalyst, a wide range of polycyclic dihydrothiopyran-fused benzosulfolanes were smoothly obtained with excellent results (up to 99% yield, >20 : 1 dr and 99% ee) under mild reaction conditions.
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Affiliation(s)
- Lei Yang
- National Engineering Research Center of Chiral Drugs, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu, 610041, China
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5
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Diastereoselective pot-and atom-economical synthesis of densely-substituted polycyclic 1,2- and 1,2,3-fused indole scaffolds. Tetrahedron Lett 2019. [DOI: 10.1016/j.tetlet.2019.07.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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6
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Dagar A, Guin S, Samanta S. AgSbF6
-Catalyzed Tandem Reaction of 2-Alkynylanilines with Cyclic Enynones: Efficient access to 3-Furo[3,2-c
]chromenylindoles and Related Scaffolds. ASIAN J ORG CHEM 2017. [DOI: 10.1002/ajoc.201700511] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Anuradha Dagar
- Discipline of Chemistry; Indian Institute of Technology Indore; Simrol 453552 Indore India
| | - Soumitra Guin
- Discipline of Chemistry; Indian Institute of Technology Indore; Simrol 453552 Indore India
| | - Sampak Samanta
- Discipline of Chemistry; Indian Institute of Technology Indore; Simrol 453552 Indore India
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7
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Mao H, You BX, Zhou LJ, Xie TT, Wen YH, Lv X, Wang XX. SmI2-mediated reductive cyclization of β-arylthio ketones: a facile and diastereoselective synthesis of thiochroman derivatives. Org Biomol Chem 2017; 15:6157-6166. [DOI: 10.1039/c7ob01082f] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
SmI2-mediated reductive cyclization of β-arylthio ketones afforded a general approach to dihydrothiochroman-ols in good yields and high degrees of diastereoselectivity.
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Affiliation(s)
- Hui Mao
- Department of Chemistry
- College of Chemistry and Life Sciences
- Zhejiang Normal University
- Jinhua 321004
- People's Republic of China
| | - Bing-Xin You
- Department of Chemistry
- College of Chemistry and Life Sciences
- Zhejiang Normal University
- Jinhua 321004
- People's Republic of China
| | - Lie-Jin Zhou
- Department of Chemistry
- College of Chemistry and Life Sciences
- Zhejiang Normal University
- Jinhua 321004
- People's Republic of China
| | - Ting-Ting Xie
- Department of Chemistry
- College of Chemistry and Life Sciences
- Zhejiang Normal University
- Jinhua 321004
- People's Republic of China
| | - Yi-Hang Wen
- Department of Chemistry
- College of Chemistry and Life Sciences
- Zhejiang Normal University
- Jinhua 321004
- People's Republic of China
| | - Xin Lv
- Department of Chemistry
- College of Chemistry and Life Sciences
- Zhejiang Normal University
- Jinhua 321004
- People's Republic of China
| | - Xiao-Xia Wang
- Department of Chemistry
- College of Chemistry and Life Sciences
- Zhejiang Normal University
- Jinhua 321004
- People's Republic of China
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8
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Access to densely functionalized naphthalenes by organobase catalyzed domino reaction of 2-(2-formylaryl)acetophenones with nitroolefins. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.06.062] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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9
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Ladraa S, Chioua M, Belfaitah A. A Simple and Ecofriendly One-Pot Synthesis of Highly Substituted 3-Cyanopyridine-Quinoline Hybridsviaa Triphenyphosphine-Catalyzed Multicomponent Reaction Under Mild Conditions. J Heterocycl Chem 2016. [DOI: 10.1002/jhet.2631] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Souheila Ladraa
- Laboratoire des Produits Naturels d'Origine Végétale et de Synthèse Organique, Faculté des Sciences Exactes, Campus de Chaabat Ersas; Université des frères Mentouri-Constantine; Constantine 25000 Algeria
| | - Mourad Chioua
- Instituto de Quimica Organica General; Spanish National Research Council; CSIC at C/Serrano, 117 28006 Madrid Spain
| | - Ali Belfaitah
- Laboratoire des Produits Naturels d'Origine Végétale et de Synthèse Organique, Faculté des Sciences Exactes, Campus de Chaabat Ersas; Université des frères Mentouri-Constantine; Constantine 25000 Algeria
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10
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Bryant LA, Fanelli R, Cobb AJA. Cupreines and cupreidines: an established class of bifunctional cinchona organocatalysts. Beilstein J Org Chem 2016; 12:429-43. [PMID: 27340439 PMCID: PMC4901932 DOI: 10.3762/bjoc.12.46] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Accepted: 02/16/2016] [Indexed: 12/18/2022] Open
Abstract
Cinchona alkaloids with a free 6'-OH functionality are being increasingly used within asymmetric organocatalysis. This fascinating class of bifunctional catalyst offers a genuine alternative to the more commonly used thiourea systems and because of the different spacing between the functional groups, can control enantioselectivity where other organocatalysts have failed. In the main, this review covers the highlights from the last five years and attempts to show the diversity of reactions that these systems can control. It is hoped that chemists developing asymmetric methodologies will see the value in adding these easily accessible, but underused organocatalysts to their screens.
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Affiliation(s)
- Laura A Bryant
- School of Chemistry, Food and Pharmacy (SCFP), University of Reading, Whiteknights, Reading, Berks RG6 6AD, United Kingdom
| | - Rossana Fanelli
- School of Chemistry, Food and Pharmacy (SCFP), University of Reading, Whiteknights, Reading, Berks RG6 6AD, United Kingdom
| | - Alexander J A Cobb
- School of Chemistry, Food and Pharmacy (SCFP), University of Reading, Whiteknights, Reading, Berks RG6 6AD, United Kingdom
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11
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Biswas S, Dagar A, Mobin SM, Samanta S. DABCO catalyzed domino Michael/hydroalkoxylation reaction involving α-alkynyl-β-aryl nitroolefins: excellent stereoselective access to dihydropyrano[3,2-c]chromenes, pyranonaphthoquinones and related heterocycles. Org Biomol Chem 2016; 14:1940-5. [DOI: 10.1039/c5ob02400e] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The stereoselective (up to ≤96 : 4 Z/E ratio) access to pyrano[3,2-c]chromenes and related scaffolds has been achieved in 72–89% yields via a domino reaction of enolizable cyclic 1,3-dicarbonyls and β-alkynyl nitroolefins.
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Affiliation(s)
- Soumen Biswas
- Department of Chemistry
- Indian Institute of Technology Indore
- Indore
- India
| | - Anuradha Dagar
- Department of Chemistry
- Indian Institute of Technology Indore
- Indore
- India
| | - Shaikh M. Mobin
- Department of Chemistry
- Indian Institute of Technology Indore
- Indore
- India
| | - Sampak Samanta
- Department of Chemistry
- Indian Institute of Technology Indore
- Indore
- India
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12
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Singh S, Samanta S. Efficient One-Pot Access to 2,9-Dihydrothiopyrano[2,3-b]indole Scaffolds Showing Large Stokes Shifts. CHINESE J CHEM 2015. [DOI: 10.1002/cjoc.201500572] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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13
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Srivastava A, Yadav A, Samanta S. Biopolymeric alginic acid: an efficient recyclable green catalyst for the Friedel–Crafts reaction of indoles with isoquinoline-1,3,4-triones in water. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.09.041] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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14
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Moon HR, Kim KH, Lee J, Kim JN. Synthesis of 3-(γ,δ-Disubstituted)allylidene-2-Oxindoles from Isatins by Wittig Reaction with Morita-Baylis-Hillman Bromides. B KOREAN CHEM SOC 2015. [DOI: 10.1002/bkcs.10053] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Hye Ran Moon
- Department of Chemistry and Institute of Basic Science; Chonnam National University; Gwangju 500-757 Korea
| | - Ko Hoon Kim
- Department of Chemistry and Institute of Basic Science; Chonnam National University; Gwangju 500-757 Korea
| | - Junseong Lee
- Department of Chemistry and Institute of Basic Science; Chonnam National University; Gwangju 500-757 Korea
| | - Jae Nyoung Kim
- Department of Chemistry and Institute of Basic Science; Chonnam National University; Gwangju 500-757 Korea
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15
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Srivastava A, Biswas S, Singh S, Mobin SM, Samanta S. Organocatalysed Michael addition on arylmethylidenemalonates involving 4-(2-nitrophenyl)acetoacetate: diversity-oriented access to 8,9-dihydropyrido[1,2-a]indol-6(7H)-one and salicylate scaffolds. RSC Adv 2015. [DOI: 10.1039/c5ra01430a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
A diversity-oriented synthesis of 8,9-dihydropyrido[1,2-a]indol-6(7H)-one and salicylate scaffolds was achieved in high yields with excellent diastereoselectivities (≤96 : 4 dr) via an organocatalytic reaction of alkylidene malonates with 4-(2-nitrophenyl) acetoacetate.
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16
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Dagar A, Biswas S, Samanta S. A catalyst-free, efficient green MCR protocol for access to functionalized γ-carbolines in water. RSC Adv 2015. [DOI: 10.1039/c5ra08422a] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
A catalyst-free green procedure for access to substituted γ-carbolines has been achieved in water with excellent yields via a MCR reaction of 3-formyl indole derivatives, aldehydes with NH4OAc at room temperature under aerobic conditions.
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Affiliation(s)
- Anuradha Dagar
- Indian Institute of Technology
- Department of Technology
- Indore
- India
| | - Soumen Biswas
- Indian Institute of Technology
- Department of Technology
- Indore
- India
| | - Sampak Samanta
- Indian Institute of Technology
- Department of Technology
- Indore
- India
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17
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Singh S, Srivastava A, Mobin SM, Samanta S. A remarkable solvent effect on the reaction of 4-hydroxycoumarin with (E)-3-aryl-2-nitroprop-2-enol: Facile synthesis of highly substituted furo/pyrano[3,2-c]chromenes. RSC Adv 2015. [DOI: 10.1039/c4ra10610e] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The solvent dependent reaction of 4-hydroxycoumarin with (E)-3-aryl-2-nitroprop-2-enol has been reported for the synthesis functionalized furo/pyrano[3,2-c]chromenes in water and DMSO media.
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18
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Sekine D, Okeda S, Hosokawa S. Concise Synthesis of 6-Formylindolo[3,2-b]carbazole (FICZ). CHEM LETT 2014. [DOI: 10.1246/cl.140843] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Daisuke Sekine
- Department of Applied Chemistry, Faculty of Advanced Science and Engineering, Waseda University
| | - Shota Okeda
- Department of Applied Chemistry, Faculty of Advanced Science and Engineering, Waseda University
| | - Seijiro Hosokawa
- Department of Applied Chemistry, Faculty of Advanced Science and Engineering, Waseda University
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19
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Chen S, Pan J, Wang Y, Zhou Z. Stereocontrolled Construction of the 3,4-Dihydrothiacarbazol-2(9H)-one Skeleton by Using Bifunctional Squaramide-Catalyzed Cascade Reactions. European J Org Chem 2014. [DOI: 10.1002/ejoc.201403078] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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20
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Halimehjani AZ, Namboothiri INN, Hooshmand SE. Part II: nitroalkenes in the synthesis of heterocyclic compounds. RSC Adv 2014. [DOI: 10.1039/c4ra08830a] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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21
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Wu L, Wang Y, Zhou Z. Stereocontrolled construction of the dihydrothiopyrano[2,3-b]indole skeleton via an organocatalyzed asymmetric cascade sulfa-Michael-aldol reaction. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/j.tetasy.2014.09.005] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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22
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Majee D, Biswas S, Mobin SM, Samanta S. An expedient one-pot sequential three-component reaction for the stereoselective synthesis of functionalized spiro-sulfamidate imine fused δ-lactone scaffold. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.06.088] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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23
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Tongkhan S, Radchatawedchakoon W, Kruanetr S, Sakee U. Silica-supported ceric ammonium nitrate catalyzed chemoselective formylation of indoles. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.04.124] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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24
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Arai T, Yamamoto Y. Diversity-Oriented Asymmetric Catalysis (DOAC): Stereochemically Divergent Synthesis of Thiochromanes Using an Imidazoline–Aminophenol–Nickel-Catalyzed Michael/Henry Reaction. Org Lett 2014; 16:1700-3. [DOI: 10.1021/ol500361w] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Takayoshi Arai
- Department of Chemistry,
Graduate School of Science, Chiba University, 1-33 Yayoi, Inage, Chiba 263-8522, Japan
| | - Yushi Yamamoto
- Department of Chemistry,
Graduate School of Science, Chiba University, 1-33 Yayoi, Inage, Chiba 263-8522, Japan
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25
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Srivastava A, Mobin SM, Samanta S. (±)-CSA catalyzed one-pot synthesis of 6,7-dihydrospiro[indole-3,1′-isoindoline]-2,3′,4(1H,5H)-trione derivatives: easy access of spirooxindoles and ibophyllidine-like alkaloids. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.01.154] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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26
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The stereoselective synthesis of tetrahydrothiopyrano[2,3-b]indole skeletons via tandem reaction of indoline-2-thiones to Baylis–Hillman adduct acetates. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.07.043] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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27
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Choudhury AR, Mukherjee S. A Catalytic Michael/Horner-Wadsworth-Emmons Cascade Reaction for Enantioselective Synthesis of Thiochromenes. Adv Synth Catal 2013. [DOI: 10.1002/adsc.201300281] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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28
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Srivastava A, Singh S, Samanta S. (±)-CSA catalyzed Friedel–Crafts alkylation of indoles with 3-ethoxycarbonyl-3-hydoxyisoindolin-1-one: an easy access of 3-ethoxycarbonyl-3-indolylisoindolin-1-ones bearing a quaternary α-amino acid moiety. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.01.010] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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29
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Biswas S, Jaiswal PK, Singh S, Mobin SM, Samanta S. l-Proline catalyzed stereoselective synthesis of (E)-methyl-α-indol-2-yl-β-aryl/alkyl acrylates: easy access to substituted carbazoles, γ-carbolines and prenostodione. Org Biomol Chem 2013; 11:7084-7. [DOI: 10.1039/c3ob41573b] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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30
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Jaiswal PK, Biswas S, Singh S, Pathak B, Mobin SM, Samanta S. Stereoselective synthesis of highly functionalized tetrahydrocarbazoles through a domino Michael–Henry reaction: an easy access to four contiguous chiral centers. RSC Adv 2013. [DOI: 10.1039/c3ra41409d] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
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31
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Jaiswal PK, Biswas S, Singh S, Samanta S. An organocatalytic highly efficient approach to the direct synthesis of substituted carbazoles in water. Org Biomol Chem 2013; 11:8410-8. [DOI: 10.1039/c3ob42034e] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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