1
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Liu S, Zhang C, Xiong Q, Liu Y, Li L, Sun Y, Cheng B, Chen F. Syntheses of Substituted α,β-Unsaturated δ-Lactams from N-Boc-2,4-dioxopiperidine. J Org Chem 2023. [PMID: 37992127 DOI: 10.1021/acs.joc.3c01027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2023]
Abstract
A method for the syntheses of substituted α,β-unsaturated δ-lactams (2) from the commercially available compound N-Boc-2,4-dioxopiperidine (1) has been developed. The α-substituents were introduced by a reductive Knoevenagel condensation reaction, and the β-substituents were installed by palladium-catalyzed cross coupling reactions. More than 20 diverse examples were prepared in 2-3 steps. The synthesis was operationally simple, user-friendly, and easy to scale up.
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Affiliation(s)
- Saiya Liu
- School of Science, Green Pharmaceutical Engineering Research Center, Harbin Institute of Technology, Shenzhen 518055, China
| | - Chenchen Zhang
- School of Science, Green Pharmaceutical Engineering Research Center, Harbin Institute of Technology, Shenzhen 518055, China
| | - Qihua Xiong
- School of Science, Green Pharmaceutical Engineering Research Center, Harbin Institute of Technology, Shenzhen 518055, China
| | - Yuexin Liu
- School of Science, Green Pharmaceutical Engineering Research Center, Harbin Institute of Technology, Shenzhen 518055, China
| | - Lu Li
- School of Science, Green Pharmaceutical Engineering Research Center, Harbin Institute of Technology, Shenzhen 518055, China
| | - Yongqiang Sun
- School of Science, Green Pharmaceutical Engineering Research Center, Harbin Institute of Technology, Shenzhen 518055, China
| | - Bichu Cheng
- School of Science, Green Pharmaceutical Engineering Research Center, Harbin Institute of Technology, Shenzhen 518055, China
- State Key Laboratory of Natural and Biomimetic Drugs, Peking University, Beijing 100191, China
| | - Fener Chen
- School of Science, Green Pharmaceutical Engineering Research Center, Harbin Institute of Technology, Shenzhen 518055, China
- Engineering Center of Catalysis and Synthesis for Chiral Molecules, Department of Chemistry, Fudan University, Shanghai 200433, China
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2
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Xie JH, Hou YM, Feng Z, You SL. Stereodivergent Construction of 1,3-Chiral Centers via Tandem Asymmetric Conjugate Addition and Allylic Substitution Reaction. Angew Chem Int Ed Engl 2023; 62:e202216396. [PMID: 36597878 DOI: 10.1002/anie.202216396] [Citation(s) in RCA: 11] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2022] [Revised: 01/03/2023] [Accepted: 01/04/2023] [Indexed: 01/05/2023]
Abstract
Herein, we report a synthesis of cyclohexanones bearing multi-continuous stereocenters by combining copper-catalyzed asymmetric conjugate addition of dialkylzinc reagents to cyclic enones with iridium-catalyzed asymmetric allylic substitution reaction. Good to excellent yields, diastereoselectivity and enantioselectivity can be obtained. Unlike the stereodivergent construction of adjacent stereocenters (1,2-position) reported in the literature, the current reaction can achieve the stereodivergent construction of nonadjacent stereocenters (1,3-position) by a proper combination of two chiral catalysts with different enantiomers.
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Affiliation(s)
- Jia-Hao Xie
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Lu, 200032, Shanghai, China
| | - Yi-Ming Hou
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Lu, 200032, Shanghai, China
| | - Zuolijun Feng
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Lu, 200032, Shanghai, China
| | - Shu-Li You
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Lu, 200032, Shanghai, China
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3
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Baek D, Ryu H, Hahm H, Lee J, Hong S. Palladium Catalysis Featuring Attractive Noncovalent Interactions Enabled Highly Enantioselective Access to β-Quaternary δ-Lactams. ACS Catal 2022. [DOI: 10.1021/acscatal.2c00541] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Doohyun Baek
- Department of Chemistry, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju 61005, Republic of Korea
| | - Huijeong Ryu
- Department of Chemistry, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju 61005, Republic of Korea
| | - Hyungwoo Hahm
- Department of Chemistry, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju 61005, Republic of Korea
| | - Junseong Lee
- Department of Chemistry, Chonnam National University, 77 Yongbong-ro,
Buk-gu, Gwangju 61186, Republic of Korea
| | - Sukwon Hong
- Department of Chemistry, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju 61005, Republic of Korea
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4
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Mudráková B, Kisszékelyi P, Vargová D, Zakiewicz D, Šebesta R. Asymmetric Tandem Conjugate Addition and Reaction with Carbocations on Unsaturated Heterocycles. Adv Synth Catal 2022. [DOI: 10.1002/adsc.202101485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Brigita Mudráková
- Comenius University in Bratislava Faculty of Natural Sciences Department of Organic Chemistry, Mlynská dolina Ilkovičova 6 842 15 Bratislava Slovakia
| | - Péter Kisszékelyi
- Comenius University in Bratislava Faculty of Natural Sciences Department of Organic Chemistry, Mlynská dolina Ilkovičova 6 842 15 Bratislava Slovakia
| | - Denisa Vargová
- Comenius University in Bratislava Faculty of Natural Sciences Department of Organic Chemistry, Mlynská dolina Ilkovičova 6 842 15 Bratislava Slovakia
| | - Dorota Zakiewicz
- Comenius University in Bratislava Faculty of Natural Sciences Department of Organic Chemistry, Mlynská dolina Ilkovičova 6 842 15 Bratislava Slovakia
| | - Radovan Šebesta
- Comenius University in Bratislava Faculty of Natural Sciences Department of Organic Chemistry, Mlynská dolina Ilkovičova 6 842 15 Bratislava Slovakia
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5
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Guo Y, Harutyunyan SR. Copper-catalysed alkylation of heterocyclic acceptors with organometallic reagents. Beilstein J Org Chem 2020; 16:1006-1021. [PMID: 32509032 PMCID: PMC7237809 DOI: 10.3762/bjoc.16.90] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Accepted: 04/20/2020] [Indexed: 11/30/2022] Open
Abstract
Copper-catalysed asymmetric C–C bond-forming reactions using organometallic reagents have developed into a powerful tool for the synthesis of complex molecules with single or multiple stereogenic centres over the past decades. Among the various acceptors employed in such reactions, those with a heterocyclic core are of particular importance because of the frequent occurrence of heterocyclic scaffolds in the structures of chiral natural products and bioactive molecules. Hence, this review focuses on the progress made over the past 20 years for heterocyclic acceptors.
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Affiliation(s)
- Yafei Guo
- Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands
| | - Syuzanna R Harutyunyan
- Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands
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6
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Kingsbury A, Brough S, McCarthy AP, Lewis W, Woodward S. Conjugate Addition Routes to 2‐Alkyl‐2,3‐dihydroquinolin‐4(1
H
)‐ones and 2‐Alkyl‐4‐hydroxy‐1,2‐dihydroquinoline‐3‐carboxylates. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201901036] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Alex Kingsbury
- GSK Carbon Neutral Laboratories for Sustainable Chemistry University of Nottingham Jubilee Campus NG7 2TU Nottingham United Kingdom
| | - Steve Brough
- Key Organics Ltd Highfield Road Industrial Estate PL32 9RA Camelford Cornwall United Kingdom
| | - Antonio Pedrina McCarthy
- GSK Carbon Neutral Laboratories for Sustainable Chemistry University of Nottingham Jubilee Campus NG7 2TU Nottingham United Kingdom
| | - William Lewis
- GSK Carbon Neutral Laboratories for Sustainable Chemistry University of Nottingham Jubilee Campus NG7 2TU Nottingham United Kingdom
| | - Simon Woodward
- GSK Carbon Neutral Laboratories for Sustainable Chemistry University of Nottingham Jubilee Campus NG7 2TU Nottingham United Kingdom
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7
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Copper-catalyzed asymmetric tandem double Michael reactions of diethylzinc to α,β-unsaturated ketones followed by trapping with nitroolefins. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.06.032] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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8
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Vargová D, Némethová I, Plevová K, Šebesta R. Asymmetric Transition-Metal Catalysis in the Formation and Functionalization of Metal Enolates. ACS Catal 2019. [DOI: 10.1021/acscatal.8b04357] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Denisa Vargová
- Comenius University in Bratislava, Faculty of Natural Sciences, Department of Organic Chemistry, Mlynská dolina, Ilkovičova 6, 842 15 Bratislava, Slovak Republic
| | - Ivana Némethová
- Comenius University in Bratislava, Faculty of Natural Sciences, Department of Organic Chemistry, Mlynská dolina, Ilkovičova 6, 842 15 Bratislava, Slovak Republic
| | - Kristína Plevová
- Comenius University in Bratislava, Faculty of Natural Sciences, Department of Organic Chemistry, Mlynská dolina, Ilkovičova 6, 842 15 Bratislava, Slovak Republic
| | - Radovan Šebesta
- Comenius University in Bratislava, Faculty of Natural Sciences, Department of Organic Chemistry, Mlynská dolina, Ilkovičova 6, 842 15 Bratislava, Slovak Republic
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9
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Chen M, Rago AJ, Dong G. Platinum-Catalyzed Desaturation of Lactams, Ketones, and Lactones. Angew Chem Int Ed Engl 2018; 57:16205-16209. [PMID: 30325556 DOI: 10.1002/anie.201811197] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2018] [Indexed: 12/16/2022]
Abstract
The development of a general platinum-catalyzed desaturation of N-protected lactams, ketones, and lactones to their conjugated α,β-unsaturated counterparts is reported. The reaction operates under mildly acidic conditions at room temperature or 50 °C. It is scalable and tolerates a wide range of functional groups. The complementary reactivity to the palladium-catalyzed desaturation is demonstrated in the efficient conversion of iodide, bromide, and sulfur-containing substrates.
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Affiliation(s)
- Ming Chen
- Department of Chemistry, University of Chicago, Chicago, IL, 60637, USA
| | - Alexander J Rago
- Department of Chemistry, University of Chicago, Chicago, IL, 60637, USA
| | - Guangbin Dong
- Department of Chemistry, University of Chicago, Chicago, IL, 60637, USA
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10
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Chen M, Rago AJ, Dong G. Platinum‐Catalyzed Desaturation of Lactams, Ketones, and Lactones. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201811197] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Ming Chen
- Department of ChemistryUniversity of Chicago Chicago IL 60637 USA
| | | | - Guangbin Dong
- Department of ChemistryUniversity of Chicago Chicago IL 60637 USA
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11
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Yuan P, Chen J, Zhao J, Huang Y. Enantioselective Hydroamidation of Enals by Trapping of a Transient Acyl Species. Angew Chem Int Ed Engl 2018; 57:8503-8507. [PMID: 29693756 DOI: 10.1002/anie.201803556] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2018] [Indexed: 12/13/2022]
Abstract
An enantioselective synthesis of β-chiral amides through asymmetric and redox-neutral hydroamidation of enals is reported. In this reaction, a chiral N-heterocyclic carbene (NHC) catalyst reacts with enals to generate the homoenolate intermediate. Upon highly enantioselective β-protonation through proton-shuttle catalysis, the resulting azolium intermediate reacts with imidazole to yield the key β-chiral acyl species. This transient intermediate provides access to diversified β-chiral carbonyl derivatives, such as amides, hydrazides, acids, esters, and thioesters. In particular, β-chiral amides can be prepared in excellent yield and ee (40 chiral amides, up to 95 % yield and 99 % ee). This modular strategy overcomes the challenge of disruption of the highly selective proton-shuttling process by basic amines.
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Affiliation(s)
- Pengfei Yuan
- State Key Laboratory of Chemical Oncogenomics, Key Laboratory of Chemical Genomics, Peking University, Shenzhen Graduate School, Shenzhen, 518055, China
| | - Jiean Chen
- State Key Laboratory of Chemical Oncogenomics, Key Laboratory of Chemical Genomics, Peking University, Shenzhen Graduate School, Shenzhen, 518055, China
| | - Jing Zhao
- State Key Laboratory of Coordination Chemistry, Institute of Chemistry and BioMedical Sciences, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, China
| | - Yong Huang
- State Key Laboratory of Chemical Oncogenomics, Key Laboratory of Chemical Genomics, Peking University, Shenzhen Graduate School, Shenzhen, 518055, China
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12
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Yuan P, Chen J, Zhao J, Huang Y. Enantioselective Hydroamidation of Enals by Trapping of a Transient Acyl Species. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201803556] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Pengfei Yuan
- State Key Laboratory of Chemical Oncogenomics Key Laboratory of Chemical Genomics Peking University Shenzhen Graduate School Shenzhen 518055 China
| | - Jiean Chen
- State Key Laboratory of Chemical Oncogenomics Key Laboratory of Chemical Genomics Peking University Shenzhen Graduate School Shenzhen 518055 China
| | - Jing Zhao
- State Key Laboratory of Coordination Chemistry Institute of Chemistry and BioMedical Sciences School of Chemistry and Chemical Engineering Nanjing University Nanjing 210093 China
| | - Yong Huang
- State Key Laboratory of Chemical Oncogenomics Key Laboratory of Chemical Genomics Peking University Shenzhen Graduate School Shenzhen 518055 China
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13
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Némethová I, Bilka S, Šebesta R. Enantioselective copper-catalyzed conjugate additions of in situ generated organozirconium reagents to N -heterocyclic Michael acceptors. J Organomet Chem 2018. [DOI: 10.1016/j.jorganchem.2017.12.042] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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14
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Rodríguez-Fernández M, Yan X, Collados JF, White PB, Harutyunyan SR. Lewis Acid Enabled Copper-Catalyzed Asymmetric Synthesis of Chiral β-Substituted Amides. J Am Chem Soc 2017; 139:14224-14231. [PMID: 28960071 PMCID: PMC5639465 DOI: 10.1021/jacs.7b07344] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
![]()
Here we report that readily available
silyl- and boron-based Lewis
acids in combination with chiral copper catalysts are able to overcome
the reactivity issues of unactivated enamides, known as the least
reactive carboxylic acid derivatives, toward alkylation with organomagnesium
reagents. Allowing unequaled chemo-reactivity and stereocontrol in
catalytic asymmetric conjugate addition to enamides, the method is
distinguished by its unprecedented reaction scope, allowing even the
most challenging and synthetically important methylations to be accomplished
with good yields and excellent enantioselectivities. This catalytic
protocol tolerates a broad temperature range (−78 °C to
ambient) and scale up (10 g), while the chiral catalyst can be reused
without affecting overall efficiency. Mechanistic studies revealed
the fate of the Lewis acid in each elementary step of the copper-catalyzed
conjugate addition of Grignard reagents to enamides, allowing us to
identify the most likely catalytic cycle of the reaction.
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Affiliation(s)
- Mamen Rodríguez-Fernández
- Stratingh Institute for Chemistry, University of Groningen , Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Xingchen Yan
- Stratingh Institute for Chemistry, University of Groningen , Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Juan F Collados
- Stratingh Institute for Chemistry, University of Groningen , Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Paul B White
- Institute for Molecules and Materials, Radboud University , Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
| | - Syuzanna R Harutyunyan
- Stratingh Institute for Chemistry, University of Groningen , Nijenborgh 4, 9747 AG Groningen, The Netherlands
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15
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Yu Y, Humeidi R, Alleyn JR, Doyle MP. Catalytic Allylic Oxidation of Cyclic Enamides and 3,4-Dihydro-2H-Pyrans by TBHP. J Org Chem 2017; 82:8506-8513. [PMID: 28723085 DOI: 10.1021/acs.joc.7b01163] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Allylic oxidation of heteroatom substituted cyclic alkenes by tert-butyl hydroperoxide (70% TBHP in water) using catalytic dirhodium caprolactamate [Rh2(cap)4] forms enone products with a variety of 2-substituted cyclic enamides and 3,4-dihyro-2H-pyrans. These reactions occur under mild reaction conditions, are operationally convenient to execute, and are effective for product formation with as low as 0.25 mol% catalyst loading. With heteroatom stabilization of the intermediate allylic free radical two sites for oxidative product formation are possible, and the selectivity of the oxidative process varies with the heteroatom when R = H. Cyclic enamides produce 4-piperidones in good yields when R = alkyl or aryl, but oxidation of 2H-pyrans also gives alkyl cleavage products. Alternative catalysts for TBHP oxidations show comparable selectivities but give lower product yields.
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Affiliation(s)
- Yang Yu
- Department of Chemistry, The University of Texas at San Antonio , San Antonio, Texas 78249, United States
| | - Ranad Humeidi
- Department of Chemistry, The University of Texas at San Antonio , San Antonio, Texas 78249, United States
| | - James R Alleyn
- Department of Chemistry, The University of Texas at San Antonio , San Antonio, Texas 78249, United States
| | - Michael P Doyle
- Department of Chemistry, The University of Texas at San Antonio , San Antonio, Texas 78249, United States
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16
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Chen M, Dong G. Direct Catalytic Desaturation of Lactams Enabled by Soft Enolization. J Am Chem Soc 2017; 139:7757-7760. [DOI: 10.1021/jacs.7b04722] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ming Chen
- Department
of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
| | - Guangbin Dong
- Department
of Chemistry, University of Chicago, Chicago, Illinois 60637, United States
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17
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Yang SM, Madhusudhan Reddy G, Liu MH, Wang TP, Yu JK, Lin W. Diastereoselective Synthesis of Rauhut–Currier-Type Adducts via an Unexpected α-Addition of α,β-Unsaturated γ-Butyrolactams to Coumarin Derivatives. J Org Chem 2016; 82:781-789. [DOI: 10.1021/acs.joc.6b02526] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Shu-Mei Yang
- Department of Chemistry, National Taiwan Normal University, 88, Sec. 4, Tingchow Road, Taipei 11677, Taiwan R.O.C
| | - Ganapuram Madhusudhan Reddy
- Department of Chemistry, National Taiwan Normal University, 88, Sec. 4, Tingchow Road, Taipei 11677, Taiwan R.O.C
| | - Meng-Hsien Liu
- Department of Chemistry, National Taiwan Normal University, 88, Sec. 4, Tingchow Road, Taipei 11677, Taiwan R.O.C
| | - Tzu-Ping Wang
- Department of Chemistry, National Taiwan Normal University, 88, Sec. 4, Tingchow Road, Taipei 11677, Taiwan R.O.C
| | - Jhen-Kuei Yu
- Department of Chemistry, National Taiwan Normal University, 88, Sec. 4, Tingchow Road, Taipei 11677, Taiwan R.O.C
| | - Wenwei Lin
- Department of Chemistry, National Taiwan Normal University, 88, Sec. 4, Tingchow Road, Taipei 11677, Taiwan R.O.C
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18
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Ubukata S, Ito JI, Oguri R, Nishiyama H. Asymmetric Three-Component Coupling Reaction of Alkyne, Enone, and Aldehyde Catalyzed by Chiral Phebox Ruthenium Catalysts. J Org Chem 2016; 81:3347-55. [DOI: 10.1021/acs.joc.6b00374] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Shino Ubukata
- Department
of Applied Chemistry,
Graduate School of Engineering, Nagoya University, Furo-cho Chikusa-ku, Nagoya 464-8603, Japan
| | - Jun-ichi Ito
- Department
of Applied Chemistry,
Graduate School of Engineering, Nagoya University, Furo-cho Chikusa-ku, Nagoya 464-8603, Japan
| | - Ryota Oguri
- Department
of Applied Chemistry,
Graduate School of Engineering, Nagoya University, Furo-cho Chikusa-ku, Nagoya 464-8603, Japan
| | - Hisao Nishiyama
- Department
of Applied Chemistry,
Graduate School of Engineering, Nagoya University, Furo-cho Chikusa-ku, Nagoya 464-8603, Japan
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19
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Liang X, Jiang SZ, Wei K, Yang YR. Enantioselective Total Synthesis of (−)-Alstoscholarisine A. J Am Chem Soc 2016; 138:2560-2. [PMID: 26882407 DOI: 10.1021/jacs.6b00625] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Xiao Liang
- State
Key Laboratory of Phytochemistry and Plant Resources in West China,
Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Shi-Zhi Jiang
- State
Key Laboratory of Phytochemistry and Plant Resources in West China,
Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
| | - Kun Wei
- State
Key Laboratory of Phytochemistry and Plant Resources in West China,
Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
| | - Yu-Rong Yang
- State
Key Laboratory of Phytochemistry and Plant Resources in West China,
Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China
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20
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Canterbury DP, Hesp KD, Polivkova J. Palladium-catalyzed β-(hetero)arylation of α,β-unsaturated valerolactams. Org Biomol Chem 2016; 14:7731-4. [DOI: 10.1039/c6ob01126h] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A method for the palladium-catalyzed arylation of α,β-unsaturated valerolactams is reported.
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21
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Byrd KM. Diastereoselective and enantioselective conjugate addition reactions utilizing α,β-unsaturated amides and lactams. Beilstein J Org Chem 2015; 11:530-62. [PMID: 25977728 PMCID: PMC4419509 DOI: 10.3762/bjoc.11.60] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2015] [Accepted: 04/01/2015] [Indexed: 12/19/2022] Open
Abstract
The conjugate addition reaction has been a useful tool in the formation of carbon-carbon bonds. The utility of this reaction has been demonstrated in the synthesis of many natural products, materials, and pharmacological agents. In the last three decades, there has been a significant increase in the development of asymmetric variants of this reaction. Unfortunately, conjugate addition reactions using α,β-unsaturated amides and lactams remain underdeveloped due to their inherently low reactivity. This review highlights the work that has been done on both diastereoselective and enantioselective conjugate addition reactions utilizing α,β-unsaturated amides and lactams.
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Affiliation(s)
- Katherine M Byrd
- Department of Medicinal Chemistry, University of Kansas, 1251 Wescoe Hall Drive Lawrence, Kansas 66045-7582, USA
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22
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Chen YR, Das U, Liu MH, Lin W. Organocatalytic Enantioselective Direct Vinylogous Michael Addition of α,β-Unsaturated γ-Butyrolactam to β-Acyl Acrylates and 1,2-Diacylethylenes. J Org Chem 2015; 80:1985-92. [DOI: 10.1021/jo5027047] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Yi-Ru Chen
- Department of Chemistry, National Taiwan Normal University, Taipei 11677, Taiwan, Republic of China
| | - Utpal Das
- Organic Chemistry Division, CSIR-National Chemical Laboratory, Pune-411 008, India
| | - Meng-Hsien Liu
- Department of Chemistry, National Taiwan Normal University, Taipei 11677, Taiwan, Republic of China
| | - Wenwei Lin
- Department of Chemistry, National Taiwan Normal University, Taipei 11677, Taiwan, Republic of China
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23
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Schoonen AK, Fernández-Ibáñez MÁ, Fañanás-Mastral M, Teichert JF, Feringa BL. Chiral amides via copper-catalysed enantioselective conjugate addition. Org Biomol Chem 2014; 12:36-41. [PMID: 24196172 DOI: 10.1039/c3ob41923a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Anne K Schoonen
- Department of Organic Chemistry and Molecular Inorganic Chemistry, Stratingh Institute, University of Groningen, Nijenborgh 4, 9747AG, Groningen, The Netherlands.
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24
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Pace V, Rae JP, Procter DJ. Cu(I)–NHC Catalyzed Asymmetric Silyl Transfer to Unsaturated Lactams and Amides. Org Lett 2013; 16:476-9. [DOI: 10.1021/ol4033623] [Citation(s) in RCA: 80] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Vittorio Pace
- School of Chemistry, University of Manchester, Oxford
Road, Manchester, M13 9PL, U.K
| | - James P. Rae
- School of Chemistry, University of Manchester, Oxford
Road, Manchester, M13 9PL, U.K
| | - David J. Procter
- School of Chemistry, University of Manchester, Oxford
Road, Manchester, M13 9PL, U.K
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25
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Jiang X, Liu L, Zhang P, Zhong Y, Wang R. Catalytic Asymmetric β,γ Activation of α,β-Unsaturated γ-Butyrolactams: Direct Approach to β,γ-Functionalized Dihydropyranopyrrolidin-2-ones. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201302622] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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26
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Jiang X, Liu L, Zhang P, Zhong Y, Wang R. Catalytic asymmetric β,γ activation of α,β-unsaturated γ-butyrolactams: direct approach to β,γ-functionalized dihydropyranopyrrolidin-2-ones. Angew Chem Int Ed Engl 2013; 52:11329-33. [PMID: 23929785 DOI: 10.1002/anie.201302622] [Citation(s) in RCA: 70] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2013] [Indexed: 11/05/2022]
Abstract
Skeleton in the closet: The title reaction enables the development of the first catalytic β,γ-selective Diels-Alder [4+2] annulation of α,β-unsaturated γ-butyrolactams (see scheme; Boc=tert-butoxycarbonyl, Ts=4-toluenesulfonyl). This process provides a direct method for the enantioselective construction of bi- or tricyclic dihydropyranopyrrolidin-2-one skeletons in only one step.
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Affiliation(s)
- Xianxing Jiang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, School of Basic Medical Sciences, Institute of Biochemistry and Molecular Biology, State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou, 730000 (China).
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27
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Cottet P, Müller D, Alexakis A. Copper-catalyzed asymmetric conjugate addition of alkenyl- and alkylalanes to α,β-unsaturated lactams. Org Lett 2013; 15:828-31. [PMID: 23360523 DOI: 10.1021/ol303505k] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Alkenyl and alkyl groups have been successfully introduced to six-membered α,β-unsaturated lactams via a copper-catalyzed asymmetric 1,4-addition of the corresponding alanes. Moderate to good yields and good to excellent enantioselectivities are achieved by using a combination of the very cheap copper(II) naphthenate and a readily available phosphine amine ligand. The creation of an all-carbon quaternary stereogenic center, via Michael addition to a trisubstituted conjugated lactam, is also disclosed for the first time.
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Affiliation(s)
- Pierre Cottet
- Department of Organic Chemistry, University of Geneva, Quai Ernest Ansermet 30, CH-1211 Geneva 4, Switzerland
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28
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Mao B, Fañanás-Mastral M, Feringa BL. Asymmetric Conjugate Addition of Grignard Reagents to Pyranones. Org Lett 2013; 15:286-9. [DOI: 10.1021/ol303141x] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Bin Mao
- Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Martín Fañanás-Mastral
- Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Ben L. Feringa
- Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
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29
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Drusan M, Galeštoková Z, Šebesta R. Diastereoselective copper-catalysed 1,4-addition of Grignard reagents to N-enoyl oxazolidinones. RSC Adv 2013. [DOI: 10.1039/c3ra42024h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
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30
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Galeštoková Z, Šebesta R. Domino Reactions Initiated by Enantioselective Cu-Catalyzed Conjugate Addition. European J Org Chem 2012. [DOI: 10.1002/ejoc.201200875] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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31
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Conjugate Addition of Organoaluminum Species to Michael Acceptors and Related Processes. TOP ORGANOMETAL CHEM 2012. [DOI: 10.1007/3418_2012_40] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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32
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Teichert JF, Feringa BL. Phosphoramidites: privileged ligands in asymmetric catalysis. Angew Chem Int Ed Engl 2010; 49:2486-528. [PMID: 20333685 DOI: 10.1002/anie.200904948] [Citation(s) in RCA: 541] [Impact Index Per Article: 38.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Asymmetric catalysis with transition-metal complexes is the basis for a vast array of stereoselective transformations and has changed the face of modern synthetic chemistry. Key to this success has been the design of chiral ligands to control the regio-, diastereo-, and enantioselectivity. Phosphoramidites have emerged as a highly versatile and readily accessible class of chiral ligands. Their modular structure enables the formation of ligand libraries and easy fine-tuning for a specific catalytic reaction. Phosphoramidites frequently show exceptional levels of stereocontrol, and their monodentate nature is essential in combinatorial catalysis, where a ligand-mixture approach is used. In this Review, recent developments in asymmetric catalysis with phosphoramidites used as ligands are discussed, with a focus on the formation of carbon-carbon and carbon-heteroatom bonds.
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Affiliation(s)
- Johannes F Teichert
- Stratingh Institute for Chemistry and Center for Systems Chemistry, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands
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33
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Chea H, Sim HS, Yun J. Copper-Catalyzed Conjugate Addition of Diboron Reagents to α,β-Unsaturated Amides: Highly Reactive Copper-1,2- Bis(diphenylphosphino)benzene Catalyst System. Adv Synth Catal 2009. [DOI: 10.1002/adsc.200900040] [Citation(s) in RCA: 135] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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34
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Jerphagnon T, Pizzuti MG, Minnaard AJ, Feringa BL. Recent advances in enantioselective copper-catalyzed 1,4-addition. Chem Soc Rev 2009; 38:1039-75. [PMID: 19421581 DOI: 10.1039/b816853a] [Citation(s) in RCA: 329] [Impact Index Per Article: 21.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A comprehensive overview of recent literature from 2003 concerning advances in enantioselective copper catalysed 1,4-addition of organometallic reagents to alpha,beta-unsaturated compounds is given in this critical review. About 200 ligands and catalysts are presented, with a focus on stereoselectivities, catalyst loading, ligand structure and substrate scope. A major part is devoted to trapping and tandem reactions and a variety of recent synthetic applications are used to illustrate the practicality and current state of the art of 1,4-addition of organometallic reagents. Finally several mechanistic studies are discussed (162 references).
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Affiliation(s)
- Thomas Jerphagnon
- University of Groningen, Stratingh Institute for Chemistry, Nijenborgh 4, 9747 AG, Groningen, The Netherlands
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35
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Sośnicki JG. Michael addition of nitroalkanes to nonactivated α,β-unsaturated δ-thiolactams: reactivity, diastereoselectivity, and comparison to α,β-unsaturated δ-lactams. Tetrahedron 2009. [DOI: 10.1016/j.tet.2008.12.037] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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36
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Pizzuti MG, Minnaard AJ, Feringa BL. Catalytic asymmetric synthesis of the alkaloid (+)-myrtine. Org Biomol Chem 2008; 6:3464-6. [PMID: 19082145 DOI: 10.1039/b807575a] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new protocol for the asymmetric synthesis of trans-2,6-disubstituted-4-piperidones has been developed using a catalytic enantioselective conjugate addition reaction in combination with a diastereoselective lithiation-substitution sequence; an efficient synthesis of (+)-myrtine has been achieved via this route.
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Affiliation(s)
- Maria Gabriella Pizzuti
- Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, 9747, AG, Groningen, The Netherlands
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37
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Alexakis A, Bäckvall JE, Krause N, Pàmies O, Diéguez M. Enantioselective copper-catalyzed conjugate addition and allylic substitution reactions. Chem Rev 2008; 108:2796-823. [PMID: 18671436 DOI: 10.1021/cr0683515] [Citation(s) in RCA: 802] [Impact Index Per Article: 50.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- A Alexakis
- Departament of Organic Chemistry, University of Geneva, 30 Quai Ernest Ansermet, 1211 Genève 4, Switzerland
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38
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Regioselectivity, scope, and limitations of the addition of organolithium and allylmagnesium reagents to 1H-pyridine-2-thiones; access to 3,4-, 3,6-, and 5,6-dihydropyridine-2-thiones. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.09.029] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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39
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Šebesta R, Pizzuti MG, Minnaard A, Feringa B. Copper-Catalyzed Enantioselective Conjugate Addition of Organometallic Reagents to Acyclic Dienones. Adv Synth Catal 2007. [DOI: 10.1002/adsc.200600272] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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40
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Zhang H, Gschwind RM. Influence of Copper Salts, Solvents, and Ligands on the Structures of Precatalytic Phosphoramidite Copper Complexes for Conjugate Addition Reactions. Chemistry 2007; 13:6691-700. [PMID: 17506045 DOI: 10.1002/chem.200601857] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
For copper-catalyzed enantioselective conjugate addition reactions of organozinc reagents, the available knowledge about the mechanism and the structures involved is still insufficient to understand in detail the strong influences of solvent, salt, and ligand size, or to enable a rational control of this reaction. Screening with three phosphoramidite ligands and four copper(I) salts using NMR spectroscopy has revealed a binuclear copper complex with mixed trigonal/tetrahedral stereochemistry as the basic structural motif of the ground state of precatalysts with highly stereoselective ligands. Ligands with smaller amine moieties allow higher coordination numbers and higher aggregation levels, leading to reduced ee values. Since the ESI mass spectra of several precatalytic copper halide complexes show a striking correlation with the structures observed in solution, ESI-MS may be used as a fast tool to determine the maximum number of phosphoramidite ligands attached to copper.
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Affiliation(s)
- Hongxia Zhang
- Institut für Organische Chemie, Universität Regensburg, Universitätsstrasse 31, 93053 Regensburg, Germany
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41
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Amat M, Pérez M, Minaglia AT, Peretto B, Bosch J. A general synthetic route to enantiopure cis-fused perhydrocycloalka[c]pyridines from phenylglycinol-derived lactams. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.01.072] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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42
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Li K, Alexakis A. Copper-Catalyzed Enantioselective Intramolecular Conjugate Addition/Trapping Reactions: Synthesis of Cyclic Compounds with Multichiral Centers. Chemistry 2007; 13:3765-71. [PMID: 17245784 DOI: 10.1002/chem.200601327] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The Cu-catalyzed enantioselective conjugate addition of dialkylzinc to bis-alpha,beta-unsaturated carbonyl compounds followed by the intramolecular trapping of the zinc enolate in the presence of chiral phosphoramidite ligands was investigated. Cyclic and heterocyclic compounds with multichiral centers were formed as a mixture of two diastereomers with excellent diastereoselectivities (up to 99:1) and enantioselectivities (up to 94 % ee, ee=enantiomeric excess). The stereochemistry was determined to be trans,trans for the major products and trans,cis for the minor products. The absolute configuration of the cyclic compounds was assigned by comparison with the analogous adduct derived from trans-3-nonen-2-one and Et(2)Zn or the adduct obtained through conjugate addition of Me(2)Zn to trans-1-phenyl-non-2-en-1-one. Further transformation of these cyclic products into more complex compounds is under investigation in our laboratory.
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Affiliation(s)
- Kangying Li
- Department of Organic Chemistry, University of Geneva, 30 quai E. Ansermet, 1211 Geneva 4, Switzerland
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43
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Oueslati F, Perrio C, Dupas G, Barré L. Diastereoselective Conjugate Addition of Organocuprates to 3,4-Dimethyl-5,6-dihydro-2(1H)-pyridinones. A Concise Synthesis oftrans-3,4-Dimethyl-4-phenylpiperidines. Org Lett 2007; 9:153-6. [PMID: 17192108 DOI: 10.1021/ol062708+] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[reaction: see text] Conjugate addition of aryl or alkyl cuprates to 3,4-dimethyl-5,6-dihydro-2(1H)-pyridinones led to diastereoisomerically pure 3,4,4-trisubstituted 2-piperidinones in 39-78% yields. The yields and the diastereochemistry of piperidinones depended on both the N-protecting group and the organocuprate. Reduction then deprotection of the trans-3,4-dimethyl-4-phenyl product provided the corresponding piperidine, analogue of a key precursor of opioid receptor antagonists.
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Affiliation(s)
- Farhana Oueslati
- Groupe de Développements Méthodologiques en Tomographie par Emission de Positons, UMR CEA 2E, Université de Caen-Basse Normandie, Centre Cyceron, 15 Boulevard Henri Becquerel, BP 5229, F-14074 Caen Cedex, France
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44
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Brown MK, Degrado SJ, Hoveyda AH. Highly enantioselective Cu-catalyzed conjugate additions of dialkylzinc reagents to unsaturated furanones and pyranones: preparation of air-stable and catalytically active Cu-peptide complexes. Angew Chem Int Ed Engl 2006; 44:5306-10. [PMID: 16041815 DOI: 10.1002/anie.200501251] [Citation(s) in RCA: 114] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- M Kevin Brown
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, MA 02467, USA
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45
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46
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Deiters A, Pettersson M, Martin SF. General Strategy for the Syntheses of Corynanthe, Tacaman, and Oxindole Alkaloids. J Org Chem 2006; 71:6547-61. [PMID: 16901143 DOI: 10.1021/jo061032t] [Citation(s) in RCA: 97] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report herein the total synthesis of the corynanthe alkaloid dihydrocorynantheol and the formal syntheses of the indole alkaloids tacamonine, rhynchophylline, and hirsutine. The strategies for assembling the corynanthe and tacaman skeletal frameworks comprised of both the classical ABD --> ABCD and ABC --> ABCD approaches wherein the variously substituted piperidinone D-rings were formed via ring-closing metathesis (RCM) followed by a 1,4-addition to introduce the requisite side chain at C(15). Since 1,4-additions to alpha,beta-unsaturated lactams represent an underdeveloped field, we conducted a series of studies with two unsaturated lactams employing organocuprates and metal enolates as the nucleophiles. These studies revealed that organocuprates derived from Grignard reagents and either stoichiometric amounts of CuCN or catalytic amounts of CuBr.DMS complex are excellent nucleophiles for such additions; TMSCl was a crucial additive for optimizing these reactions. The anion derived from ethyl 1,3-dithiolane-2-carboxylate was also an excellent nucleophile in these 1,4-additions, although the stereochemistry of such 1,4-additions to carboline-derived, unsaturated lactams was sensitive to substitution on the indole nitrogen atom. The ABD --> ABCD approach to these alkaloids featured a novel one-pot sequence of an RCM reaction and a zirconocene-catalyzed carbomagnesation followed by a second RCM to generate the D-ring.
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Affiliation(s)
- Alexander Deiters
- Department of Chemistry and Biochemistry, University of Texas, Austin, Texas 78712, USA
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47
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Pineschi M, Del Moro F, Di Bussolo V, Macchia F. Highly Enantioselective Copper-Phosphoramidite-Catalyzed Conjugate Addition of Dialkylzinc Reagents to Acyclic α,β-Unsaturated Imides. Adv Synth Catal 2006. [DOI: 10.1002/adsc.200505309] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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48
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Guo HC, Ma JA. Catalytic Asymmetric Tandem Transformations Triggered by Conjugate Additions. Angew Chem Int Ed Engl 2006; 45:354-66. [PMID: 16287187 DOI: 10.1002/anie.200500195] [Citation(s) in RCA: 506] [Impact Index Per Article: 28.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The development of efficient methods to access complex molecules with multistereogenic centers has been a substantial challenge in both academic research and industrial applications. One approach to this challenge is catalytic asymmetric tandem transformations, which allow a rapid increase in molecular complexity from readily available starting materials to produce enantiopure compounds. In recent years, considerable efforts have been directed towards the development of asymmetric tandem transformations. This Minireview highlights recent developments and the applications of metal-catalyzed and organocatalytic asymmetric tandem transformations triggered by conjugate additions.
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Affiliation(s)
- Hong-Chao Guo
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim/Ruhr, Germany
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49
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Guo HC, Ma JA. Katalytische asymmetrische Tandemumwandlungen mit einer konjugierten Addition als einleitendem Schritt. Angew Chem Int Ed Engl 2006. [DOI: 10.1002/ange.200500195] [Citation(s) in RCA: 189] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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50
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Zhang W, Wang CJ, Gao W, Zhang X. Highly enantioselective copper-catalyzed conjugate addition of diethylzinc to cyclic enones with spirocyclic phosphoramidite ligands. Tetrahedron Lett 2005. [DOI: 10.1016/j.tetlet.2005.06.162] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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