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Li Y, Xu J, He LJ, Luo YF, Meng JP, Tang DY, Li HY, Chen ZZ, Xu ZG. Dieckmann Condensation of Ugi N-Acylamino Amide Product: Facile Access to Functionalized 2,2-Disubstituted Indolin-3-ones. J Org Chem 2021; 87:823-834. [PMID: 34918940 DOI: 10.1021/acs.joc.1c02501] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Structurally unique 2,2-disubstituted indolin-3-ones with a quaternary carbon center have been constructed through a novel C-C bond formation at the C3 position of Ugi N-acylamino amide adducts employing an organic base-mediated Dieckmann condensation. This facile, flexible protocol can be fine-tuned to construct drug-like pyrazino[1,2-a]indole fragments with the same quaternary carbon center only through the variation of the acid part in Ugi input. This novel and expeditious methodology has a broad scope and can rapidly generate the drug-like indolin-3-one core.
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Affiliation(s)
- Yong Li
- College of Pharmacy, National & Local Joint Engineering Research Center of Targeted and Innovative Therapeutics, IATTI, Chongqing University of Arts and Sciences, 319 Honghe Avenue, Yongchuan, Chongqing 402160, China
| | - Jia Xu
- College of Pharmacy, National & Local Joint Engineering Research Center of Targeted and Innovative Therapeutics, IATTI, Chongqing University of Arts and Sciences, 319 Honghe Avenue, Yongchuan, Chongqing 402160, China
| | - Liu-Jun He
- College of Pharmacy, National & Local Joint Engineering Research Center of Targeted and Innovative Therapeutics, IATTI, Chongqing University of Arts and Sciences, 319 Honghe Avenue, Yongchuan, Chongqing 402160, China
| | - Ya-Fei Luo
- College of Pharmacy, National & Local Joint Engineering Research Center of Targeted and Innovative Therapeutics, IATTI, Chongqing University of Arts and Sciences, 319 Honghe Avenue, Yongchuan, Chongqing 402160, China
| | - Jiang-Ping Meng
- College of Pharmacy, National & Local Joint Engineering Research Center of Targeted and Innovative Therapeutics, IATTI, Chongqing University of Arts and Sciences, 319 Honghe Avenue, Yongchuan, Chongqing 402160, China
| | - Dian-Yong Tang
- College of Pharmacy, National & Local Joint Engineering Research Center of Targeted and Innovative Therapeutics, IATTI, Chongqing University of Arts and Sciences, 319 Honghe Avenue, Yongchuan, Chongqing 402160, China
| | - Hong-Yu Li
- Department of Pharmaceutical Sciences, College of Pharmacy, University of Arkansas for Medical Sciences, Little Rock, Arkansas 72205, United States
| | - Zhong-Zhu Chen
- College of Pharmacy, National & Local Joint Engineering Research Center of Targeted and Innovative Therapeutics, IATTI, Chongqing University of Arts and Sciences, 319 Honghe Avenue, Yongchuan, Chongqing 402160, China
| | - Zhi-Gang Xu
- College of Pharmacy, National & Local Joint Engineering Research Center of Targeted and Innovative Therapeutics, IATTI, Chongqing University of Arts and Sciences, 319 Honghe Avenue, Yongchuan, Chongqing 402160, China
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2
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Du L, Gong Y, Han J, Xin X, Luo H, Tian Y, Li Y, Li B. Cascade 8π Electrocyclization/Benzannulation to Access Highly Substituted Phenylpyridines. Org Lett 2021; 23:7966-7971. [PMID: 34617768 DOI: 10.1021/acs.orglett.1c02968] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A cascade 8π electrocyclization/benzannulation reaction was developed to obtain the synthetically important highly substituted phenyl-pyridines. This method shows great potential in the rapid and inexpensive application of the scalable and operationally simple production of accessible substrates. On the basis of the resulting phenyl-pyridine products, a new Ru catalyst and bidentate ligand were designed and prepared, further demonstrating its high practicability.
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Affiliation(s)
- Luan Du
- School of Chemistry and Chemical Engineering, Chongqing University, 174 Shazheng Street, Chongqing 400044, China
| | - Yiliang Gong
- School of Chemistry and Chemical Engineering, Chongqing University, 174 Shazheng Street, Chongqing 400044, China
| | - Jingpeng Han
- School of Chemistry and Chemical Engineering, Chongqing University, 174 Shazheng Street, Chongqing 400044, China
| | - Xiaolan Xin
- School of Chemistry and Chemical Engineering, Chongqing University, 174 Shazheng Street, Chongqing 400044, China
| | - Han Luo
- School of Chemistry and Chemical Engineering, Chongqing University, 174 Shazheng Street, Chongqing 400044, China
| | - Yi Tian
- School of Chemistry and Chemical Engineering, Chongqing University, 174 Shazheng Street, Chongqing 400044, China
| | - You Li
- School of Chemistry and Chemical Engineering, Chongqing University, 174 Shazheng Street, Chongqing 400044, China
| | - Baosheng Li
- School of Chemistry and Chemical Engineering, Chongqing University, 174 Shazheng Street, Chongqing 400044, China
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3
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Yao Z, Liu X, Li Z, Xu S, Xu L, Liu X. Dienolate‐Mediated, Regioselective C2‐Polarity Reversal of Chromone‐Based Reactants and Their Application in Nucleophilic Strategies. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000942] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Zhen Yao
- Department of Chemistry Renmin University of China Beijing 100872 People's Republic of China
| | - Xiong‐Wei Liu
- Guizhou Engineering Center for Innovative Traditional Chinese Medicine and Ethnic Medicine Guizhou University Guiyang 550025 People's Republic of China
| | - Zheng Li
- Guizhou Engineering Center for Innovative Traditional Chinese Medicine and Ethnic Medicine Guizhou University Guiyang 550025 People's Republic of China
| | - Sheng‐Wen Xu
- Guizhou Engineering Center for Innovative Traditional Chinese Medicine and Ethnic Medicine Guizhou University Guiyang 550025 People's Republic of China
| | - Lijin Xu
- Department of Chemistry Renmin University of China Beijing 100872 People's Republic of China
| | - Xiong‐Li Liu
- Guizhou Engineering Center for Innovative Traditional Chinese Medicine and Ethnic Medicine Guizhou University Guiyang 550025 People's Republic of China
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4
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Yadav GD, Wagh DP. Claisen‐Schmidt Condensation using Green Catalytic Processes: A Critical Review. ChemistrySelect 2020. [DOI: 10.1002/slct.202001737] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Ganapati D. Yadav
- Department of Chemical EngineeringInstitute of Chemical Technology Nathalal Parekh Marg, Matunga Mumbai 400019 India
| | - Dipti P. Wagh
- Department of Chemical EngineeringInstitute of Chemical Technology Nathalal Parekh Marg, Matunga Mumbai 400019 India
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5
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Ramaraju P, Pawar AP, Iype E, Mir NA, Choudhary S, Sharma DK, Kant R, Kumar I. Enantio- and Diastereoselective Two-Pot Synthesis of Isoquinuclidines from Glutaraldehyde and N-Aryl Imines with DFT Calculations. J Org Chem 2019; 84:12408-12419. [PMID: 31486644 DOI: 10.1021/acs.joc.9b01865] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A pot-economic method for the enantio- and diastereoselective synthesis of a [2.2.2] azabicyclic isoquinuclidine system is developed. This protocol involves the proline-catalyzed direct Mannich reaction-cyclization/IBX-mediated site-selective oxidation/NaBH4-reduction sequence between glutaraldehyde and imines to generate in situ chiral 1,2-DHPs, followed by the diastereoselective Diels-Alder reaction with N-aryl maleimides furnishing isoquinuclidines in overall five steps. A variety of isoquinuclidines having five-contiguous chiral centers, including an all-carbon quaternary, were prepared with high yields (up to 78%) and excellent stereoselectivity (>50:1 dr, and up to >99:1 er). DFT calculations support the observed high stereoselective reaction outcome.
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Affiliation(s)
- Panduga Ramaraju
- Department of Chemistry , Birla Institute of Technology and Science , Pilani 333 031 , Rajasthan , India
| | - Amol Prakash Pawar
- Department of Chemistry , Birla Institute of Technology and Science , Pilani 333 031 , Rajasthan , India
| | - Eldhose Iype
- Department of Chemical Engineering , BITS Pilani, Dubai Campus , Dubai 345055 , UAE
| | - Nisar A Mir
- Department of Chemistry , Birla Institute of Technology and Science , Pilani 333 031 , Rajasthan , India
| | - Sachin Choudhary
- Department of Chemistry , Birla Institute of Technology and Science , Pilani 333 031 , Rajasthan , India
| | - Devinder Kumar Sharma
- X-ray Crystallography Laboratory, Post-Graduate Department of Physics & Electronics , University of Jammu , Jammu 180 006 , India
| | - Rajni Kant
- X-ray Crystallography Laboratory, Post-Graduate Department of Physics & Electronics , University of Jammu , Jammu 180 006 , India
| | - Indresh Kumar
- Department of Chemistry , Birla Institute of Technology and Science , Pilani 333 031 , Rajasthan , India
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6
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New chiral morpholine-pyrrolidine ligands affecting asymmetric selectivity in copper catalyzed Henry reaction. Tetrahedron Lett 2019. [DOI: 10.1016/j.tetlet.2019.01.048] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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7
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Choudhary S, Pawar AP, Yadav J, Sharma DK, Kant R, Kumar I. One-Pot Synthesis of Chiral Tetracyclic Dibenzo[ b, f][1,4]oxazepine-Fused 1,2-Dihydropyridines (DHPs) under Metal-Free Conditions. J Org Chem 2018; 83:9231-9239. [PMID: 29906390 DOI: 10.1021/acs.joc.8b01232] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An efficient protocol for the catalytic asymmetric synthesis of new dibenzo[ b, f][1,4]-oxazepine-fused 1,2-dihydropyridines (DHPs) has been described under metal-free conditions. This reaction proceeds through proline-catalyzed direct Mannich/cyclization between seven-membered dibenzo[ b, f][1,4]-oxazepine-imines and aqueous glutaraldehyde, followed by IBX-mediated site-selective dehydrogenative oxidation in one-pot operation with high yields (up to 92%) and excellent enantioselectivity (up to >99:1 er).
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Affiliation(s)
- Sachin Choudhary
- Department of Chemistry , Birla Institute of Technology & Science , Pilani 333 031 , India
| | - Amol Prakash Pawar
- Department of Chemistry , Birla Institute of Technology & Science , Pilani 333 031 , India
| | - Jyothi Yadav
- Department of Chemistry , Birla Institute of Technology & Science , Pilani 333 031 , India
| | - Devinder Kumar Sharma
- X-ray Crystallography Laboratory, Post-Graduate Department of Physics & Electronics , University of Jammu , Jammu and Kashmir 180 006 , India
| | - Rajni Kant
- X-ray Crystallography Laboratory, Post-Graduate Department of Physics & Electronics , University of Jammu , Jammu and Kashmir 180 006 , India
| | - Indresh Kumar
- Department of Chemistry , Birla Institute of Technology & Science , Pilani 333 031 , India
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8
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Efficient preparation method of 4-hydroxybenzoic esters – Oxidation of substituted Hagemman’s ester. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.04.090] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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9
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Hu P, Hu J, Jiao J, Tong X. Amine-Promoted Asymmetric (4+2) Annulations for the Enantioselective Synthesis of Tetrahydropyridines: A Traceless and Recoverable Auxiliary Strategy. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201300526] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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10
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Hu P, Hu J, Jiao J, Tong X. Amine-Promoted Asymmetric (4+2) Annulations for the Enantioselective Synthesis of Tetrahydropyridines: A Traceless and Recoverable Auxiliary Strategy. Angew Chem Int Ed Engl 2013; 52:5319-22. [DOI: 10.1002/anie.201300526] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2013] [Revised: 02/19/2013] [Indexed: 11/07/2022]
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11
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Ramachary DB, Reddy YV. Dienamine Catalysis: An Emerging Technology in Organic Synthesis. European J Org Chem 2011. [DOI: 10.1002/ejoc.201101157] [Citation(s) in RCA: 214] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
| | - Y. Vijayendar Reddy
- School of Chemistry, University of Hyderabad, Hyderabad‐500 046, India, Fax: +91‐40‐23012460
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13
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Ramachary DB, Jain S. Sequential one-pot combination of multi-component and multi-catalysis cascade reactions: an emerging technology in organic synthesis. Org Biomol Chem 2010; 9:1277-300. [PMID: 21120241 DOI: 10.1039/c0ob00611d] [Citation(s) in RCA: 219] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Creating sequential one-pot combinations of multi-component reactions (MCRs) and multi-catalysis cascade (MCC) reactions is a challenging task that has already emerged as a new technology in synthetic organic chemistry. Through one-pot sequential combination of MCRs/MCC reactions, the chemical products (fine chemicals, agrochemicals and pharmaceuticals) that add value to our lives can be produced with less waste and greater economic benefits. Within this Emerging Area, we describe our recent developments and designs for sequential one-pot MCRs/MCC reactions to facilitate their realization as biomimetics in organic chemistry.
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14
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Ramachary DB, Ramakumar K, Bharanishashank A, Narayana VV. Sequential One-Pot Combination of Multireactions through Multicatalysis: A General Approach to Rapid Assembly of Functionalized Push−Pull Olefins, Phenols, and 2-Methyl-2H-chromenes. ACTA ACUST UNITED AC 2010; 12:855-76. [DOI: 10.1021/cc100104k] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - Kinthada Ramakumar
- School of Chemistry, University of Hyderabad, Central University (PO), Hyderabad 500 046, India
| | - Adluri Bharanishashank
- School of Chemistry, University of Hyderabad, Central University (PO), Hyderabad 500 046, India
| | - Vidadala V. Narayana
- School of Chemistry, University of Hyderabad, Central University (PO), Hyderabad 500 046, India
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15
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Li JL, Kang TR, Zhou SL, Li R, Wu L, Chen YC. Organocatalytic Asymmetric Inverse-Electron-Demand Diels-Alder Reaction of Electron-Deficient Dienes and Crotonaldehyde. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.201002912] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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16
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Li JL, Kang TR, Zhou SL, Li R, Wu L, Chen YC. Organocatalytic Asymmetric Inverse-Electron-Demand Diels-Alder Reaction of Electron-Deficient Dienes and Crotonaldehyde. Angew Chem Int Ed Engl 2010; 49:6418-20. [DOI: 10.1002/anie.201002912] [Citation(s) in RCA: 110] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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17
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Pollini GP, Benetti S, De Risi C, Zanirato V. Hagemann's ester: a timeless building block for natural product synthesis. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.01.078] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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18
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Han B, Xiao YC, He ZQ, Chen YC. Asymmetric Michael Addition of γ,γ-Disubstituted α,β-Unsaturated Aldehydes to Nitroolefins via Dienamine Catalysis. Org Lett 2009; 11:4660-3. [PMID: 19754072 DOI: 10.1021/ol901939b] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Bo Han
- Key Laboratory of Drug-Targeting and Drug Delivery System of Education Ministry, Department of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu 610041, China, and State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, China
| | - You-Cai Xiao
- Key Laboratory of Drug-Targeting and Drug Delivery System of Education Ministry, Department of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu 610041, China, and State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, China
| | - Zhao-Quan He
- Key Laboratory of Drug-Targeting and Drug Delivery System of Education Ministry, Department of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu 610041, China, and State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, China
| | - Ying-Chun Chen
- Key Laboratory of Drug-Targeting and Drug Delivery System of Education Ministry, Department of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu 610041, China, and State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, China
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Ramachary DB, Ramakumar K, Narayana VV. Amino acid-catalyzed cascade [3+2]-cycloaddition/hydrolysis reactions based on the push-pull dienamine platform: synthesis of highly functionalized NH-1,2,3-triazoles. Chemistry 2008; 14:9143-7. [PMID: 18767077 DOI: 10.1002/chem.200801325] [Citation(s) in RCA: 185] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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20
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Xu DQ, Wang YF, Luo SP, Zhang S, Zhong AG, Chen H, Xu ZY. A Novel Enantioselective Catalytic Tandem Oxa-Michael-Henry Reaction: One-Pot Organocatalytic Asymmetric Synthesis of 3-Nitro-2H-chromenes. Adv Synth Catal 2008. [DOI: 10.1002/adsc.200800535] [Citation(s) in RCA: 100] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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21
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Ramachary DB, Kishor M. Direct amino acid-catalyzed cascade biomimetic reductive alkylations: application to the asymmetric synthesis of Hajos-Parrish ketone analogues. Org Biomol Chem 2008; 6:4176-87. [PMID: 18972048 DOI: 10.1039/b807999d] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A direct amino acid-catalyzed chemo- and enantioselective process for the double cascade synthesis of highly substituted 2-alkyl-cyclopentane-1,3-diones, 2-alkyl-3-methoxy-cyclopent-2-enones and Hajos-Parrish (H-P) ketone analogs is presented via reductive alkylation chemistry. For the first time, we have developed a single-step alkylation of cyclopentane-1,3-dione with aldehydes/ketones and a Hantzsch ester through an organocatalytic reductive alkylation strategy. A direct combination of amino acid-catalyzed cascade olefination-hydrogenation and cascade Robinson annulations of cyclopentane-1,3-dione, aldehydes/ketones, a Hantzsch ester and methyl vinyl ketone furnished the highly functionalized H-P ketone analogues in good to high yields and with excellent enantioselectivities. Many of the reductive alkylation products have shown direct applications in pharmaceutical chemistry.
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Mojtahedi MM, Abaee MS, Zahedi MM, Jalali MR, Mesbah AW, Massa W, Yaghoubi R, Forouzani M. Facile solvent-free synthesis and structural elucidation of styrylcyclohex-2-enone derivatives. MONATSHEFTE FUR CHEMIE 2008. [DOI: 10.1007/s00706-007-0847-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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23
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Ramachary DB, Narayana VV, Ramakumar K. Direct ionic liquid promoted organocatalyzed diazo-transfer reactions: diversity-oriented synthesis of diazo-compounds. Tetrahedron Lett 2008. [DOI: 10.1016/j.tetlet.2008.02.159] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Affiliation(s)
- Anniina Erkkilä
- Laboratory of Organic Chemistry, Department of Chemical Technology, Helsinki University of Technology, P.O. Box 6100, FI-02015 TKK, Finland
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25
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Ramachary DB, Kishor M, Reddy YV. Development of Pharmaceutical Drugs, Drug Intermediates and Ingredients by Using Direct Organo-Click Reactions. European J Org Chem 2008. [DOI: 10.1002/ejoc.200701014] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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26
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Kotsuki H, Ikishima H, Okuyama A. Organocatalytic Asymmetric Synthesis Using Proline and Related Molecules. Part 1. HETEROCYCLES 2008. [DOI: 10.3987/rev-07-620] [Citation(s) in RCA: 86] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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27
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Ramachary DB, Sakthidevi R. Combining multi-catalysis and multi-component systems for the development of one-pot asymmetric reactions: stereoselective synthesis of highly functionalized bicyclo[4.4.0]decane-1,6-diones. Org Biomol Chem 2008; 6:2488-92. [DOI: 10.1039/b806243a] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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28
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Ramachary DB, Reddy YV, Prakash BV. Double cascade reactions based on the Barbas dienamine platform: highly stereoselective synthesis of functionalized cyclohexanes for cardiovascular agents. Org Biomol Chem 2008; 6:719-26. [DOI: 10.1039/b718122a] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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30
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Synthesis of aromatic aldehydes by organocatalytic [4+2] and [3+3] cycloaddition of α,β-unsaturated aldehydes. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.01.039] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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31
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The organocatalytic direct self-trimerization of acrolein: application to the total synthesis of montiporyne F. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2006.12.055] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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32
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Ramachary DB, Ramakumar K, Narayana VV. Organocatalytic Cascade Reactions Based on Push−Pull Dienamine Platform: Synthesis of Highly Substituted Anilines. J Org Chem 2007; 72:1458-63. [PMID: 17288390 DOI: 10.1021/jo0623639] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A practical and novel one-pot organocatalytic selective process for the cascade synthesis of highly substituted o-hydroxydiarylamines and o-pyrrolidin-1-yldiarylamines is reported. Direct combination of amine-catalyzed cascade Knoevenagel/Michael/aldol condensation/decarboxylation and cascade enamine amination/isoaromatization of alkyl acetoacetates, aldehydes, and nitrosoarenes furnished the highly functionalized anilines with high yields.
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Affiliation(s)
- Dhevalapally B Ramachary
- School of Chemistry, University of Hyderabad, Central University (PO), Hyderabad 500 046, India.
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33
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ElDouhaibi AS, Lozanov M, Montgomery J. A multicomponent approach to substituted benzenes involving sequential nickel-catalyzed reactions. Tetrahedron 2006. [DOI: 10.1016/j.tet.2006.06.068] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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34
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Mossé S, Laars M, Kriis K, Kanger T, Alexakis A. 3,3‘-Bimorpholine Derivatives as a New Class of Organocatalysts for Asymmetric Michael Addition. Org Lett 2006; 8:2559-62. [PMID: 16737313 DOI: 10.1021/ol0607490] [Citation(s) in RCA: 133] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
New N-alkyl-3,3'-bimorpholine derivatives (iPBM) were revealed to be efficient organocatalysts for the asymmetric direct Michael addition of aldehydes to nitroolefins and a vinyl sulfone. In these transformations using iPBM, 1,4-adducts were afforded in high yields, with good to high levels of diastereo- and enantioselectivity. The stereochemical outcome of the reaction could be explained by an acyclic synclinal model. [reaction: see text]
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Affiliation(s)
- Sarah Mossé
- Department of Organic Chemistry, University of Geneva, 30 quai Ernest Ansermet, CH-1211 Geneva 4, Switzerland
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Ramachary DB, Kishor M, Reddy GB. Development of drug intermediates by using direct organocatalytic multi-component reactions. Org Biomol Chem 2006; 4:1641-6. [PMID: 16633553 DOI: 10.1039/b602696f] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Novel, economic and environmentally friendly one-pot three-component Knoevenagel/hydrogenation (K/H) and four-component Knoevenagel/hydrogenation/alkylation (K/H/A) reactions of ketones, CH-acids, dihydropyridines and alkyl halides using proline and proline/metal carbonate catalysis, respectively, have been developed. Many of the products of these K/H and K/H/A reactions have direct applications in pharmaceutical chemistry.
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Ramachary DB, Reddy GB. Towards organo-click reactions: development of pharmaceutical ingredients by using direct organocatalytic bio-mimetic reductions. Org Biomol Chem 2006; 4:4463-8. [PMID: 17268640 DOI: 10.1039/b612611a] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Economic and environmentally friendly bio-mimetic one-pot three and four-component Knoevenagel-hydrogenation (K-H), five-component Knoevenagel-hydrogenation-alkylation (K-H-A) and six-component Knoevenagel-hydrogenation-alkylation-Huisgen cycloaddition (K-H-A-HC) reactions of aldehydes, CH-acids, o-phenylenediamine, alkyl halides and azides using proline, proline-metal carbonate and proline-metal carbonate-Cu(I)-catalysis, respectively have been developed. Many of K-H and K-H-A compounds have direct application in pharmaceutical chemistry.
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Ramachary DB, Kishor M, Ramakumar K. A novel and green protocol for two-carbon homologation: a direct amino acid/K2CO3-catalyzed four-component reaction of aldehydes, active methylenes, Hantzsch esters and alkyl halides. Tetrahedron Lett 2006. [DOI: 10.1016/j.tetlet.2005.11.128] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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