1
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Miao YH, Hua YZ, Wang MC. Dinuclear zinc cooperative catalytic three-component reactions for highly enantioselective synthesis of 3,3′-dihydrofuran spirooxindoles. Org Biomol Chem 2019; 17:7172-7181. [DOI: 10.1039/c9ob01233h] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new dinuclear zinc cooperative catalytic enantioselective three-component reaction via a domino Knoevenagel/Michael/cyclization sequence has been developed.
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Affiliation(s)
- Yu-Hang Miao
- College of Chemistry and Molecular Engineering
- Zhengzhou University
- Zhengzhou
- People's Republic of China
| | - Yuan-Zhao Hua
- College of Chemistry and Molecular Engineering
- Zhengzhou University
- Zhengzhou
- People's Republic of China
| | - Min-Can Wang
- College of Chemistry and Molecular Engineering
- Zhengzhou University
- Zhengzhou
- People's Republic of China
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2
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Yang QQ, Xiao W, Du W, Ouyang Q, Chen YC. Asymmetric [4+2] annulations to construct norcamphor scaffolds with 2-cyclopentenone via double amine–thiol catalysis. Chem Commun (Camb) 2018; 54:1129-1132. [PMID: 29334089 DOI: 10.1039/c7cc09221k] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
A double catalytic system combining chiral amine and 2-mercaptobenzoic acid is applied for α′,β-regioselective [4+2] annulations of 2-cyclopentenone with diverse activated alkenes.
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Affiliation(s)
- Qian-Qian Yang
- Department of Medicinal Chemistry, West China School of Pharmacy, Sichuan University
- Chengdu 610041
- China
| | - Wei Xiao
- Department of Medicinal Chemistry, West China School of Pharmacy, Sichuan University
- Chengdu 610041
- China
| | - Wei Du
- Department of Medicinal Chemistry, West China School of Pharmacy, Sichuan University
- Chengdu 610041
- China
| | - Qin Ouyang
- College of Pharmacy, Third Military Medical University
- Chongqing 400038
- China
| | - Ying-Chun Chen
- Department of Medicinal Chemistry, West China School of Pharmacy, Sichuan University
- Chengdu 610041
- China
- College of Pharmacy, Third Military Medical University
- Chongqing 400038
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3
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Anebouselvy K, Shruthi KS, Ramachary DB. Asymmetric Supramolecular Organocatalysis: A Complementary Upgrade to Organocatalysis. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700611] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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4
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Ramachary DB, Reddy PS, Shruthi KS, Madhavachary R, Reddy PVG. A Brønsted Acid-Primary Amine as a Synergistic Catalyst for Stereoselective Asymmetric Diels-Alder Reactions. European J Org Chem 2016. [DOI: 10.1002/ejoc.201601011] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Dhevalapally B. Ramachary
- Catalysis Laboratory; School of Chemistry; University of Hyderabad; 500046 Hyderabad Telangana India
| | - P. Sreekanth Reddy
- Department of Chemistry; Yogi Vemana University; 516003 Kadapa Andhra Pradesh India
| | - Kodambahalli S. Shruthi
- Catalysis Laboratory; School of Chemistry; University of Hyderabad; 500046 Hyderabad Telangana India
| | - R. Madhavachary
- Catalysis Laboratory; School of Chemistry; University of Hyderabad; 500046 Hyderabad Telangana India
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5
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Philipps AR, Fritze L, Erdmann N, Enders D. An Asymmetric Organocatalytic Quadruple Domino Reaction Employing a Vinylogous Friedel-Crafts/Michael/Michael/Aldol Condensation Sequence. SYNTHESIS-STUTTGART 2015; 47:2377-2384. [PMID: 26752794 PMCID: PMC4702351 DOI: 10.1055/s-0034-1380197] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/29/2022]
Abstract
An organocatalytic quadruple cascade initiated by a Friedel-Crafts-type reaction is described. The (S)-diphenylprolinol trimethylsilyl ether catalyzed reaction yields highly functionalized cyclohexenecarbaldehydes bearing a 1,1-bis[4-(dialkylamino)phenyl]ethene moiety and three contiguous stereogenic centers. The reaction tolerates various functional groups and all products are obtained with very good diastereoselectivity and with virtually complete enantiomeric excess.
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Affiliation(s)
- Arne R. Philipps
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
| | - Lars Fritze
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
| | - Nico Erdmann
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
| | - Dieter Enders
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
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6
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Shashank AB, Ramachary DB. Organocatalytic diastereoselective synthesis of chiral decalines through the domino Claisen–Schmidt/Henry reaction. Org Biomol Chem 2015; 13:5110-4. [DOI: 10.1039/c5ob00562k] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
General and operative domino Claisen–Schmidt/Henry (CS/H) reaction has been revealed to obtain highly substituted chiral decalines in good yields with excellent ees and des by using push–pull enamine catalysis.
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Affiliation(s)
- Adluri B. Shashank
- Catalysis Laboratory
- School of Chemistry
- University of Hyderabad
- Hyderabad-500 046
- India
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7
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Ramachary DB, Venkaiah C, Reddy YV. High-yielding sequential one-pot synthesis of chiral and achiral α-substituted acrylates via a metal-free reductive coupling reaction. Org Biomol Chem 2014; 12:5400-6. [PMID: 24934801 DOI: 10.1039/c4ob00667d] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A general process for the high-yielding synthesis of substituted chiral and achiral α-substituted acrylates was achieved through the sequential one-pot combination of a metal-free reductive coupling reaction followed by an Eschenmoser methylenation. The proline catalyzed reaction of Meldrum's acid, aldehydes and Hantzsch ester followed by methylenation was successful with Eschenmoser's salt in the presence of an alcohol solvent. Herein, we have shown the high-yielding synthesis of privileged building blocks from chiral/achiral α-substituted acrylates and shown them to be very good intermediates in the pharmaceuticals and natural products synthesis.
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8
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Ramachary DB, Shiva Prasad M, Vijaya Laxmi S, Madhavachary R. Asymmetric synthesis of drug-like spiro[chroman-3,3′-indolin]-2′-ones through aminal-catalysis. Org Biomol Chem 2014; 12:574-80. [DOI: 10.1039/c3ob42100g] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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9
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Volla CMR, Atodiresei I, Rueping M. Catalytic C-C bond-forming multi-component cascade or domino reactions: pushing the boundaries of complexity in asymmetric organocatalysis. Chem Rev 2013; 114:2390-431. [PMID: 24304297 DOI: 10.1021/cr400215u] [Citation(s) in RCA: 875] [Impact Index Per Article: 79.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Chandra M R Volla
- Institute of Organic Chemistry, RWTH Aachen University , Landoltweg 1, 52074 Aachen, Germany
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10
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Ayyagari N, Mehta A, Gopi E, Deb I, Mobin SM, Namboothiri IN. Conjugate addition of curcumins to chalcones and azodicarboxylates. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.04.083] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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11
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Tu SJ, Jiang B, Zhu XT, Li QY. Highly Efficient Synthesis of 3,4-Dihydro-2(1H)-quinolinone Derivatives under Microwave Heating. HETEROCYCLES 2012. [DOI: 10.3987/com-12-12489] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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12
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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, Reddy YV, Banerjee A, Banerjee S. Design, synthesis and biological evaluation of optically pure functionalized spiro[5,5]undecane-1,5,9-triones as HIV-1 inhibitors. Org Biomol Chem 2011; 9:7282-6. [PMID: 21915419 DOI: 10.1039/c1ob06133j] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
A single-step amino acid-catalyzed diastereoselective three-component synthesis of optically pure highly functionalized spiro[5,5]undecane-1,5,9-triones preferentially over the four stereoisomers was accomplished in very good yields with >99% ee/de. Preliminary cell culture-based in vivo screening on these molecules revealed that cis-1aca and cis-1jca are better lead compounds for HIV-1 treatment than the known antiretroviral drug azidothymidine (AZT).
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14
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Tan B, Hernández-Torres G, Barbas CF. Highly Efficient Hydrogen-Bonding Catalysis of the Diels–Alder Reaction of 3-Vinylindoles and Methyleneindolinones Provides Carbazolespirooxindole Skeletons. J Am Chem Soc 2011; 133:12354-7. [DOI: 10.1021/ja203812h] [Citation(s) in RCA: 329] [Impact Index Per Article: 25.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Bin Tan
- The Skaggs Institute for Chemical Biology and Departments of Chemistry and Molecular Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Gloria Hernández-Torres
- The Skaggs Institute for Chemical Biology and Departments of Chemistry and Molecular Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
- Departamento de Química Orgánica, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
| | - Carlos F. Barbas
- The Skaggs Institute for Chemical Biology and Departments of Chemistry and Molecular Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
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15
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Shi J, Liu Y, Wang M, Lin L, Liu X, Feng X. Asymmetric synthesis of multi-substituted spiro[5,5]undecane-1,5,9-triones via organocatalytic three-component reaction. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.01.037] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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16
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Wu B, Liu GG, Li MQ, Zhang Y, Zhang SY, Qiu JR, Xu XP, Ji SJ, Wang XW. Efficient synthesis of optically active 4-nitro-cyclohexanones via bifunctional thiourea-base catalyzed double-Michael addition of nitromethane to dienones. Chem Commun (Camb) 2011; 47:3992-4. [DOI: 10.1039/c0cc05418f] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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Huang X, Wen YH, Zhou FT, Chen C, Xu DC, Xie JW. Organocatalytic and direct asymmetric vinylogous Michael addition of 3-cyano-4-methylcoumarins to α,β-unsaturated ketones. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.10.055] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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18
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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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Imashiro R, Uehara H, Barbas CF. One-Pot Enantioselective Syntheses of Iminosugar Derivatives Using Organocatalytic anti-Michael−anti-Aza-Henry Reactions. Org Lett 2010; 12:5250-3. [DOI: 10.1021/ol102292a] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ritsuo Imashiro
- The Skaggs Institute for Chemical Biology and the Departments of Chemistry and Molecular Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Hisatoshi Uehara
- The Skaggs Institute for Chemical Biology and the Departments of Chemistry and Molecular Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Carlos F. Barbas
- The Skaggs Institute for Chemical Biology and the Departments of Chemistry and Molecular Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
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20
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Proline-catalyzed aldol reactions of cyclic diketones: fluorine modifies pathways as well as transition states. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.08.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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21
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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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22
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Ramachary DB, Vijayendar Reddy Y. A general approach to chiral building blocks via direct amino acid-catalyzed cascade three-component reductive alkylations: formal total synthesis of HIV-1 protease inhibitors, antibiotic agglomerins, brefeldin A, and (R)-gamma-hexanolide. J Org Chem 2010; 75:74-85. [PMID: 19954143 DOI: 10.1021/jo901799n] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Multicatalysis cascade (MCC) process for the synthesis of highly substituted chiral building blocks (2-alkyl-CH-acids, 2-alkylcyclohexane-1,3-diones, 2-alkylcyclopentane-1,3-diones, and H-P ketone analogues) is presented based on the cascade three-component reductive alkylation's (TCRA) platform. Herein, we developed the high-yielding alkylation of a variety of CH-acids with (R)-glyceraldehyde acetonide/(S)-Garner aldehyde and Hantzsch ester through amino acid-catalyzed TCRA reaction without racemization at the alpha-position to carbonyl. Direct sequential combination of the L-proline-catalyzed TCRA reaction with other reactions like cascade alkylation/ketenization/esterification (A/K/E), alkylation/ketenization/esterification/alkylation (A/K/E/A), Brønsted acid-catalyzed cascade hydrolysis/lactonization/esterification (H/L/E), hydrolysis/esterification (H/E), hydrolysis/oxy-Michael/dehydration (H/OM/DH), and Robinson annulation (RA) of CH-acids, chiral aldehydes, Hantzsch ester, diazomethane, methyl vinyl ketone, various active olefins, and acetylenes furnished the highly functionalized chiral building blocks in good to high yields with excellent diastereoselectivities. In this context, many of the pharmaceutically applicable chiral building blocks were prepared via MCC reactions.
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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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23
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A Highly Diastereoselective Tertiary Amine-Catalyzed Cascade Michael-Michael-Henry Reaction between Nitromethane, Activated Alkenes and α,β-Unsaturated Carbonyl Compounds. Adv Synth Catal 2010. [DOI: 10.1002/adsc.200900657] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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24
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Ramachary DB, Mondal R, Venkaiah C. Rapid two-step synthesis of drug-like polycyclic substances by sequential multi-catalysis cascade reactions. Org Biomol Chem 2010; 8:321-5. [DOI: 10.1039/b920152a] [Citation(s) in RCA: 14] [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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25
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Ramachary DB, Sakthidevi R. Sequential combination of Michael and acetalization reactions: direct catalytic asymmetric synthesis of functionalized 4-nitromethyl-chromans as drug intermediates. Org Biomol Chem 2010; 8:4259-65. [DOI: 10.1039/c0ob00189a] [Citation(s) in RCA: 41] [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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26
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Samai S, Nandi GC, Singh P, Singh M. l-Proline: an efficient catalyst for the one-pot synthesis of 2,4,5-trisubstituted and 1,2,4,5-tetrasubstituted imidazoles. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.10.019] [Citation(s) in RCA: 206] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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27
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Xie JW, Huang X, Fan LP, Xu DC, Li XS, Su H, Wen YH. Efficient Method for the Synthesis of Optically Active 2-Amino-2-chromene Derivatives via One-Pot Tandem Reactions. Adv Synth Catal 2009. [DOI: 10.1002/adsc.200900579] [Citation(s) in RCA: 84] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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28
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Cao CL, Zhou YY, Zhou J, Sun XL, Tang Y, Li YX, Li GY, Sun J. An Organocatalytic Asymmetric Tandem Reaction for the Construction of Bicyclic Skeletons. Chemistry 2009; 15:11384-9. [DOI: 10.1002/chem.200900696] [Citation(s) in RCA: 91] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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29
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Ramachary D, Sakthidevi R. Direct Catalytic Asymmetric Synthesis of Highly Functionalized 2-Methylchroman-2,4-diols via Barbas-List Aldol Reaction. Chemistry 2009; 15:4516-22. [DOI: 10.1002/chem.200900066] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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30
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Ma Y, Wang M, Li D, Bekturhun B, Liu J, Liu Q. α-Alkenoyl Ketene S,S-Acetal-Based Multicomponent Reaction: An Efficient Approach for the Selective Construction of Polyfunctionalized Cyclohexanones. J Org Chem 2009; 74:3116-21. [DOI: 10.1021/jo900217g] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yuhui Ma
- Department of Chemistry, Northeast Normal University, Changchun 130024, P. R. China
| | - Mang Wang
- Department of Chemistry, Northeast Normal University, Changchun 130024, P. R. China
| | - Dan Li
- Department of Chemistry, Northeast Normal University, Changchun 130024, P. R. China
| | - Bahargul Bekturhun
- Department of Chemistry, Northeast Normal University, Changchun 130024, P. R. China
| | - Jun Liu
- Department of Chemistry, Northeast Normal University, Changchun 130024, P. R. China
| | - Qun Liu
- Department of Chemistry, Northeast Normal University, Changchun 130024, P. R. China
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Jiang B, Hao WJ, Zhang JP, Tu SJ, Shi F. A new domino autocatalytic reaction leading to polyfunctionalized spiro[5.5]undecanes and dispiro[4.2.5.2]pentadecanes. Org Biomol Chem 2009; 7:2195-201. [DOI: 10.1039/b822645h] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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32
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Ramachary DB, Venkaiah C, Reddy YV, Kishor M. Multi-catalysis cascade reactions based on the methoxycarbonylketene platform: diversity-oriented synthesis of functionalized non-symmetrical malonates for agrochemicals and pharmaceuticals. Org Biomol Chem 2009; 7:2053-62. [DOI: 10.1039/b901652j] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Ramachary DB, Narayana VV, Prasad MS, Ramakumar K. High-yielding synthesis of Nefopam analogues (functionalized benzoxazocines) by sequential one-pot cascade operations. Org Biomol Chem 2009; 7:3372-8. [DOI: 10.1039/b910397j] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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34
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Aznar F, Cabal MP, Quiñones N. Stereoselective Synthesis of Isoquinuclidinones by Direct Imino-Diels-Alder Type Reaction Catalyzed by L-Proline. HETEROCYCLES 2009. [DOI: 10.3987/com-09-11797] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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35
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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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36
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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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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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Ramachary DB, Reddy YV, Kishor M. Multi-catalysis reactions: direct organocatalytic sequential one-pot synthesis of highly functionalized cyclopenta[b]chromen-1-ones. Org Biomol Chem 2008; 6:4188-97. [DOI: 10.1039/b812551a] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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