1
|
Liu XJ, Zhang WY, Zheng C, You SL. Iridium-Catalyzed Asymmetric Allylic Substitution of Methyl Azaarenes. Angew Chem Int Ed Engl 2022; 61:e202200164. [PMID: 35238122 DOI: 10.1002/anie.202200164] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Indexed: 12/11/2022]
Abstract
Herein, an Ir-catalyzed asymmetric allylic substitution reaction of methyl azaarenes is described. Azaarenes such as (benzo)thiazole, oxazole, benzoimidazole, pyridine, and (iso)quinoline are all tolerated. The corresponding chiral azaarene derivatives are obtained in good yields with high enantioselectivity (up to 96 % yield and 99 % ee). The utilization of the Knochel reagent TMPZnBr⋅LiBr warrants the in situ formation of benzylic nucleophiles without additional activating reagents. 1 H NMR studies suggested a two-fold function of the Knochel reagent in this reaction. The synthetic utility of this method has been showcased by a concise enantioselective synthesis of an allosteric protein kinase modulator.
Collapse
Affiliation(s)
- Xi-Jia Liu
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai, 200032, China
| | - Wen-Yun Zhang
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai, 200032, China
| | - Chao Zheng
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai, 200032, 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, Shanghai, 200032, China
| |
Collapse
|
2
|
Liu XJ, Zhang WY, Zheng C, You SL. Iridium‐Catalyzed Asymmetric Allylic Substitution of Methyl Azaarenes. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202200164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Xi-Jia Liu
- Shanghai Institute of Organic Chemistry State Key Laboratory of Organometallic Chemistry CHINA
| | - Wen-Yun Zhang
- Shanghai Institute of Organic Chemistry State Key Laboratory of Organometallic Chemistry CHINA
| | - Chao Zheng
- Shanghai Institute of Organic Chemistry State Key Laboratory of Organometallic Chemistry CHINA
| | - Shu-Li You
- Shanghai Inst Org Chem State Key Lab Organometallic Chem 345 Lingling Lu 200032 Shanghai CHINA
| |
Collapse
|
3
|
Wang S, Zheng L, Wang S, Ning S, Zhang Z, Xiang J. Direct C(sp 3)-H allylation of 2-alkylpyridines with Morita-Baylis-Hillman carbonates via a tandem nucleophilic substitution/aza-Cope rearrangement. Beilstein J Org Chem 2021; 17:2505-2510. [PMID: 34646399 PMCID: PMC8491709 DOI: 10.3762/bjoc.17.167] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Accepted: 09/27/2021] [Indexed: 01/29/2023] Open
Abstract
A base- and catalyst-free C(sp3)–H allylic alkylation of 2-alkylpyridines with Morita–Baylis–Hillman (MBH) carbonates is described. A plausible mechanism of the reaction might involve a tandem SN2’ type nucleophilic substitution followed by an aza-Cope rearrangement. Various alkyl substituents on 2-alkylpyridines were tolerated in the reaction to give the allylation products in 26–91% yields. The developed method provides a straightforward and operational simple strategy for the allylic functionalization of 2-alkypyridine derivatives.
Collapse
Affiliation(s)
- Siyu Wang
- The Center for Combinatorial Chemistry and Drug Discovery, School of Pharmaceutical Sciences, Jilin University, 1266 Fujin Road, Changchun, Jilin 130021, P. R. China
| | - Lianyou Zheng
- The Center for Combinatorial Chemistry and Drug Discovery, School of Pharmaceutical Sciences, Jilin University, 1266 Fujin Road, Changchun, Jilin 130021, P. R. China
| | - Shutao Wang
- The Center for Combinatorial Chemistry and Drug Discovery, School of Pharmaceutical Sciences, Jilin University, 1266 Fujin Road, Changchun, Jilin 130021, P. R. China
| | - Shulin Ning
- The Center for Combinatorial Chemistry and Drug Discovery, School of Pharmaceutical Sciences, Jilin University, 1266 Fujin Road, Changchun, Jilin 130021, P. R. China
| | - Zhuoqi Zhang
- The Center for Combinatorial Chemistry and Drug Discovery, School of Pharmaceutical Sciences, Jilin University, 1266 Fujin Road, Changchun, Jilin 130021, P. R. China
| | - Jinbao Xiang
- The Center for Combinatorial Chemistry and Drug Discovery, School of Pharmaceutical Sciences, Jilin University, 1266 Fujin Road, Changchun, Jilin 130021, P. R. China
| |
Collapse
|
4
|
Xu JX, Chu KT, Chiang MH, Han JL. Organocatalytic asymmetric allylic alkylation of 2-methyl-3-nitroindoles: a route to direct enantioselective functionalization of indole C(sp 3)-H bonds. Org Biomol Chem 2021; 19:1503-1507. [PMID: 33533776 DOI: 10.1039/d1ob00048a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We here described a direct catalytic asymmetric functionalization of 2-methylindoles using organocatalysis. An efficient asymmetric allylic alkylation reaction with respect to 2-methyl-3-nitroindoles and racemic Morita-Baylis-Hillman carbonate has been achieved by using a chiral biscinchona alkaloid catalyst, which provided the functionalized indole derivatives in good yields and enantioselectivities.
Collapse
Affiliation(s)
- Jing-Xiang Xu
- Department of Chemistry, National Chung Hsing University, Taichung City, 40227, Taiwan, Republic of China.
| | - Kai-Ti Chu
- Institute of Chemistry, Academia Sinica, Taipei City, 11529, Taiwan, Republic of China
| | - Ming-Hsi Chiang
- Institute of Chemistry, Academia Sinica, Taipei City, 11529, Taiwan, Republic of China
| | - Jeng-Liang Han
- Department of Chemistry, National Chung Hsing University, Taichung City, 40227, Taiwan, Republic of China.
| |
Collapse
|
5
|
Meazza M, Cruz CM, Ortuño AM, Cuerva JM, Crovetto L, Rios R. Studying the reactivity of alkyl substituted BODIPYs: first enantioselective addition of BODIPY to MBH carbonates. Chem Sci 2021; 12:4503-4508. [PMID: 34163715 PMCID: PMC8179495 DOI: 10.1039/d0sc06574a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Accepted: 02/03/2021] [Indexed: 12/27/2022] Open
Abstract
The first enantioselective addition of alkyl BODIPYs to Morita-Baylis-Hillman (MBH) carbonates is reported. This is the first reported enantioselective methodology using the methylene position of BODIPYs as a nucleophile. The reaction is efficiently catalyzed by cinchona alkaloids, achieving high enantioselectivities and total diastereoselectivity. The use of cinchona alkaloid pseudo enantiomers (chinine/cinchonine) allows us to obtain both pairs of enantiomers in similar yields and enantioselectivities, a common issue in this type of reaction. The photophysical study of these dyes (absorption and fluorescence) has been performed in order to determine their parameters and explore future possible application in bioimaging. In addition, electronic circular dichroism (ECD) studies supported by time-dependent density functional theory (TD-DFT) calculations were also performed.
Collapse
Affiliation(s)
- Marta Meazza
- Faculty of Engineering & Physical Sciences, University of Southampton Highfield Campus Southampton SO17 1BJ UK
| | - Carlos M Cruz
- Departamento de Química Orgánica, Facultad de Ciencias, Unidad de Excelencia de Química Aplicada a la Biomedicina y Medioambiente (UEQ), Universidad de Granada Campus Fuentenueva 18071 Granada Spain
| | - Ana M Ortuño
- Departamento de Química Orgánica, Facultad de Ciencias, Unidad de Excelencia de Química Aplicada a la Biomedicina y Medioambiente (UEQ), Universidad de Granada Campus Fuentenueva 18071 Granada Spain
| | - Juan M Cuerva
- Departamento de Química Orgánica, Facultad de Ciencias, Unidad de Excelencia de Química Aplicada a la Biomedicina y Medioambiente (UEQ), Universidad de Granada Campus Fuentenueva 18071 Granada Spain
| | - Luis Crovetto
- Departamento de Fisicoquímica, Facultad de Farmacia, Unidad de Excelencia de Química Aplicada a la Biomedicina y Medioambiente (UEQ), Universidad de Granada Campus Cartuja 18071 Granada Spain
| | - Ramon Rios
- Faculty of Engineering & Physical Sciences, University of Southampton Highfield Campus Southampton SO17 1BJ UK
| |
Collapse
|
6
|
Meazza M, Rios R. Highly Regio‐ and Enantioselective Organocatalytic γ‐Allylic Alkylation of Quinolines. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202001213] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Marta Meazza
- School of Chemistry University of Southampton Highfield Campus SO17 1BJ Southampton UK
| | - Ramon Rios
- School of Chemistry University of Southampton Highfield Campus SO17 1BJ Southampton UK
| |
Collapse
|
7
|
Development of Multi‐Catalytic Strategies Based on the Combination between Iron‐/Copper‐ and Organo‐Catalysis. Isr J Chem 2020. [DOI: 10.1002/ijch.202000018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
|
8
|
Knox GJ, Hutchings-Goetz LS, Pearson CM, Snaddon TN. Tertiary Amine Lewis Base Catalysis in Combination with Transition Metal Catalysis. Top Curr Chem (Cham) 2020; 378:16. [PMID: 31942682 DOI: 10.1007/s41061-020-0279-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2019] [Accepted: 01/02/2020] [Indexed: 01/03/2023]
Abstract
The cooperation between two orthogonal catalytic events during the formation of carbon-carbon and carbon-heteroatom bonds has emerged as an effective strategy for enantioselective chemical synthesis. In recent years, a number of pioneering investigations have described useful chemical synthesis methods whereby the reactivity or nucleophile-electrophile combinations can be fine-tuned or extended far beyond the effect and influence of a single catalyst. The recognition of this has had profound implications for the development cooperative catalysis as a field and has provided a foundation for the development of broadly useful chemical synthesis methods. This chapter focuses on the combination of tertiary amine Lewis base and transition metal catalysts, which the authors hope will simulate further developments and advances.
Collapse
Affiliation(s)
- Gary J Knox
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, IN, 47405, USA
| | - Luke S Hutchings-Goetz
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, IN, 47405, USA
| | - Colin M Pearson
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, IN, 47405, USA
| | - Thomas N Snaddon
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, IN, 47405, USA.
| |
Collapse
|
9
|
Kaur M, Van Humbeck JF. Recent trends in catalytic sp 3 C-H functionalization of heterocycles. Org Biomol Chem 2020; 18:606-617. [PMID: 31912069 DOI: 10.1039/c9ob01559k] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Heterocycles are a ubiquitous substructure in organic small molecules designed for use in materials and medicines. Recent work in catalysis has focused on enabling access to new heterocycle structures by sp3 C-H functionalization on alkyl side-chain substituents-especially at the heterobenzylic position-with more than two hundred manuscripts published just within the last ten years. Rather than describing in detail each of these reports, in this mini-review we attempt to highlight gaps in existing techniques. A semi-quantitative overview of ongoing work strongly suggests that several specific heterocycle types and bond formations outside of C-C, C-N, and C-O have been almost completely overlooked.
Collapse
Affiliation(s)
- Milanpreet Kaur
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4.
| | - Jeffrey F Van Humbeck
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4.
| |
Collapse
|
10
|
Cozzi PG, Gualandi A, Potenti S, Calogero F, Rodeghiero G. Asymmetric Reactions Enabled by Cooperative Enantioselective Amino- and Lewis Acid Catalysis. Top Curr Chem (Cham) 2019; 378:1. [PMID: 31761979 DOI: 10.1007/s41061-019-0261-4] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2019] [Accepted: 10/22/2019] [Indexed: 01/04/2023]
Abstract
Organocatalysis-the branch of catalysis featuring small organic molecules as the catalysts-has, in the last decade, become of central importance in the field of asymmetric catalysis, so much that it is now comparable to metal catalysis and biocatalysis. Organocatalysis is rationalized and classified by a number of so-called activation modes, based on the formation of a covalent or not-covalent intermediate between the organocatalyst and the organic substrate. Among all the organocatalytic activation modes, enamine and iminium catalysis are widely used for the practical preparation of valuable products and intermediates, both in academic and industrial contexts. In both cases, chiral amines are employed as catalysts. Enamine activation mode is generally employed in the reaction with electrophiles, while nucleophiles require the iminium activation mode. Commonly, in both modes, the reaction occurs through well-organized transitions states. A large variety of partners can react with enamines and iminium ions, due to their sufficient nucleophilicity and electrophilicity, respectively. However, despite the success, organocatalysis still suffers from narrow scopes and applications. Multicatalysis is a possible solution for these drawbacks because the two different catalysts can synergistically activate the substrates, with a simultaneous activation of the two different reaction partners. In particular, in this review we will summarize the reported processes featuring Lewis acid catalysis and organocatalytic activation modes synergically acting and not interfering with each other. We will focus our attention on the description of processes in which good results cannot be achieved independently by organocatalysis or Lewis acid catalysis. In these examples of cooperative dual catalysis, a number of new organic transformations have been developed. The review will focus on the possible strategies, the choice of the Lewis acid and the catalytic cycles involved in the effective reported combination. Additionally, some important key points regarding the rationale for the effective combinations will be also included. π-Activation of organic substrates by Lewis acids, via formation of electrophilic intermediates, and their reaction with enamines will be also discussed in this review.
Collapse
Affiliation(s)
- Pier Giorgio Cozzi
- Dipartimento di Chimica "G. Ciamician", Alma Mater Studiorum, Università di Bologna, Via Selmi 2, Bologna, Italy.
| | - Andrea Gualandi
- Dipartimento di Chimica "G. Ciamician", Alma Mater Studiorum, Università di Bologna, Via Selmi 2, Bologna, Italy
| | - Simone Potenti
- Scuola Normale Superiore, Piazza dei Cavalieri 7, 56126, Pisa, Italy
| | - Francesco Calogero
- Dipartimento di Chimica "G. Ciamician", Alma Mater Studiorum, Università di Bologna, Via Selmi 2, Bologna, Italy
| | - Giacomo Rodeghiero
- Dipartimento di Chimica "G. Ciamician", Alma Mater Studiorum, Università di Bologna, Via Selmi 2, Bologna, Italy
- Cyanagen Srl, Via Stradelli Guelfi 40/C, 40138, Bologna, Italy
| |
Collapse
|
11
|
Affiliation(s)
- Marta Meazza
- School of Chemistry, Highfield CampusUniversity of Southampton University Road Southampton SO17 1BJ UK
| | - Ramon Rios
- School of Chemistry, Highfield CampusUniversity of Southampton University Road Southampton SO17 1BJ UK
| |
Collapse
|
12
|
Wang Y, Wang K, Cao W, Liu X, Feng X. Diastereo- and Enantioselective 1,6-Conjugate Addition of 2-Azaarylacetamides to para-Quinone Methides. Org Lett 2019; 21:6063-6067. [PMID: 31334665 DOI: 10.1021/acs.orglett.9b02215] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
A chiral Mg(II)/N,N'-dioxide complex was found to be highly effective in promoting the diastereo- and enantioselective 1,6-conjugate addition of various azaarylacetamides to p-quinone methides under mild reaction conditions. Various chiral azaarene derivatives containing gem(1,1)-diaryl skeletons were obtained in good yields, dr, and excellent ee values. Meanwhile, on the basis of insight gained from the control experiments as well as the single-crystal structure of the Mg(II)/N,N'-dioxide complex and product, a possible transition state was proposed to explain the origin of coordination and stereoinduction.
Collapse
Affiliation(s)
- Yan Wang
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry , Sichuan University , Chengdu 610064 , China
| | - Kaixuan Wang
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry , Sichuan University , Chengdu 610064 , China
| | - Weidi Cao
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry , Sichuan University , Chengdu 610064 , China
| | - Xiaohua Liu
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry , Sichuan University , Chengdu 610064 , China
| | - Xiaoming Feng
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry , Sichuan University , Chengdu 610064 , China
| |
Collapse
|
13
|
Putatunda S, Alegre-Requena JV, Meazza M, Franc M, Rohal'ová D, Vemuri P, Císařová I, Herrera RP, Rios R, Veselý J. Proline bulky substituents consecutively act as steric hindrances and directing groups in a Michael/Conia-ene cascade reaction under synergistic catalysis. Chem Sci 2019; 10:4107-4115. [PMID: 31015949 PMCID: PMC6457335 DOI: 10.1039/c8sc05258a] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2018] [Accepted: 03/03/2019] [Indexed: 12/23/2022] Open
Abstract
In this study, we report a highly stereoselective and versatile synthesis of spiro pyrazolones, promising motifs that are being employed as pharmacophores.
In this study, we report a highly stereoselective and versatile synthesis of spiro pyrazolones, promising motifs that are being employed as pharmacophores. The new synthetic strategy merges organocatalysis and metal catalysis to create a synergistic catalysis using proline derivatives and Pd catalysts. This protocol is suitable for late-stage functionalization, which is very important in drug discovery. Additionally, a thorough computational study proved to be very useful to elucidate the function of the different catalysts along the reaction, showing a peculiar feature: the –CPh2OSiMe3 group of the proline catalyst switches its role during the reaction. In the initial Michael reaction, this group plays its commonly-assumed role of bulky blocking group, but the same group generates π–Pd interactions and acts as a directing group in the subsequent Pd-catalyzed Conia-ene reaction. This finding might be very relevant especially for processes with many steps, such as cascade reactions, in which functional groups are assumed to play the same role during all reaction steps.
Collapse
Affiliation(s)
- Salil Putatunda
- Department of Organic Chemistry , Faculty of Science , Charles University , Hlavova 2030 , 128 43 Praha 2 , Czech Republic .
| | - Juan V Alegre-Requena
- Laboratorio de Organocatálisis Asimétrica , Departamento de Química Orgánica , Instituto de Síntesis Química y Catálisis Homogénea (ISQCH) , CSIC-Universidad de Zaragoza , C/Pedro Cerbuna 12 , 50009 Zaragoza , Spain .
| | - Marta Meazza
- University of Southampton , School of Chemistry , Highfield Campus , Southampton , SO17 1BJ , UK .
| | - Michael Franc
- Department of Organic Chemistry , Faculty of Science , Charles University , Hlavova 2030 , 128 43 Praha 2 , Czech Republic .
| | - Dominika Rohal'ová
- Department of Organic Chemistry , Faculty of Science , Charles University , Hlavova 2030 , 128 43 Praha 2 , Czech Republic .
| | - Pooja Vemuri
- University of Southampton , School of Chemistry , Highfield Campus , Southampton , SO17 1BJ , UK .
| | - Ivana Císařová
- Department of Inorganic Chemistry , Faculty of Science , Charles University , Hlavova 2030 , 128 43 Praha 2 , Czech Republic
| | - Raquel P Herrera
- Laboratorio de Organocatálisis Asimétrica , Departamento de Química Orgánica , Instituto de Síntesis Química y Catálisis Homogénea (ISQCH) , CSIC-Universidad de Zaragoza , C/Pedro Cerbuna 12 , 50009 Zaragoza , Spain .
| | - Ramon Rios
- University of Southampton , School of Chemistry , Highfield Campus , Southampton , SO17 1BJ , UK .
| | - Jan Veselý
- Department of Organic Chemistry , Faculty of Science , Charles University , Hlavova 2030 , 128 43 Praha 2 , Czech Republic .
| |
Collapse
|
14
|
Meazza M, Sitinova G, Poderi C, Mancinelli M, Zhang K, Mazzanti A, Torres RR. Synergistic Catalysis: Highly Enantioselective Acetyl Aza-arene Addition to Enals. Chemistry 2018; 24:13306-13310. [PMID: 29989264 DOI: 10.1002/chem.201802303] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Revised: 06/21/2018] [Indexed: 01/08/2023]
Abstract
A novel catalytic enantioselective methodology based on synergistic catalysis for the synthesis of chiral 2-acyl pyridines and pyrazines is reported. The strategy involves the metal-Lewis acid activation of acetyl aza-arenes and the secondary-amine activation of enals. The proposed mechanism is supported by DFT calculations.
Collapse
Affiliation(s)
- Marta Meazza
- Faculty of Natural & Environmental Sciences, University of Southampton, Highfield Campus, Southampton, SO17 1BJ, UK
| | - Gabriela Sitinova
- Faculty of Natural & Environmental Sciences, University of Southampton, Highfield Campus, Southampton, SO17 1BJ, UK
| | - Cecilia Poderi
- Faculty of Natural & Environmental Sciences, University of Southampton, Highfield Campus, Southampton, SO17 1BJ, UK.,Department of Industrial Chemistry "Toso Montanari", University of Bologna, Viale Risorgimento 4, 40136, Bologna, Italy
| | - Michele Mancinelli
- Department of Industrial Chemistry "Toso Montanari", University of Bologna, Viale Risorgimento 4, 40136, Bologna, Italy
| | - Kaiheng Zhang
- Faculty of Natural & Environmental Sciences, University of Southampton, Highfield Campus, Southampton, SO17 1BJ, UK
| | - Andrea Mazzanti
- Department of Industrial Chemistry "Toso Montanari", University of Bologna, Viale Risorgimento 4, 40136, Bologna, Italy
| | - Ramon Rios Torres
- Faculty of Natural & Environmental Sciences, University of Southampton, Highfield Campus, Southampton, SO17 1BJ, UK
| |
Collapse
|
15
|
Tong M, Wang S, Zhuang J, Qin C, Li H, Wang W. Direct Access of the Chiral Quinolinyl Core of Cinchona Alkaloids via a Brønsted Acid and Chiral Amine Co-catalyzed Chemo- and Enantioselective α-Alkylation of Quinolinylmethanols with Enals. Org Lett 2018; 20:1195-1199. [PMID: 29411985 DOI: 10.1021/acs.orglett.8b00118] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A strategy for the facile construction of the chiral quinolinylmethanolic structure, a core featured in cinchona alkaloids, is reported. A new reactivity is harnessed by TfOH-promoted chemoselective activation of α-C-H over O-H bond in quinolinylmethanols. The new reactivity is successfully engineered with an iminium catalysis in a synergistic manner to create a powerful conjugate addition-cyclization cascade process for synthesis of chiral quinoline derived γ-butyrolactones in good yields and with good to excellent enantioselectivities. The method enables the first total synthesis of natural product broussonetine in three steps.
Collapse
Affiliation(s)
- Mengchao Tong
- State Key Laboratory of Bioengineering Reactor, Shanghai Key Laboratory of New Drug Design, and School of Pharmacy, East China University of Science and Technology , 130 Mei-long Road, Shanghai 200237, China
| | - Sinan Wang
- State Key Laboratory of Bioengineering Reactor, Shanghai Key Laboratory of New Drug Design, and School of Pharmacy, East China University of Science and Technology , 130 Mei-long Road, Shanghai 200237, China
| | - Jinchen Zhuang
- State Key Laboratory of Bioengineering Reactor, Shanghai Key Laboratory of New Drug Design, and School of Pharmacy, East China University of Science and Technology , 130 Mei-long Road, Shanghai 200237, China
| | - Cong Qin
- State Key Laboratory of Bioengineering Reactor, Shanghai Key Laboratory of New Drug Design, and School of Pharmacy, East China University of Science and Technology , 130 Mei-long Road, Shanghai 200237, China
| | - Hao Li
- State Key Laboratory of Bioengineering Reactor, Shanghai Key Laboratory of New Drug Design, and School of Pharmacy, East China University of Science and Technology , 130 Mei-long Road, Shanghai 200237, China
| | - Wei Wang
- State Key Laboratory of Bioengineering Reactor, Shanghai Key Laboratory of New Drug Design, and School of Pharmacy, East China University of Science and Technology , 130 Mei-long Road, Shanghai 200237, China.,Department of Chemistry and Chemical Biology, University of New Mexico , Albuquerque, New Mexico 87131-0001, United States
| |
Collapse
|
16
|
Wei J, Li Y, Tao C, Wang H, Cheng B, Zhai H, Li Y. Organocatalytic Synthesis of 4-Aryl-1,2,3,4-tetrahydropyridines from Morita-Baylis-Hillman Carbonates through a One-Pot Three-Component Cyclization. J Org Chem 2018; 83:835-842. [DOI: 10.1021/acs.joc.7b02818] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Jian Wei
- The
State Key Laboratory of Applied Organic Chemistry, College of Chemistry
and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Yuntong Li
- The
State Key Laboratory of Applied Organic Chemistry, College of Chemistry
and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Cheng Tao
- The
State Key Laboratory of Applied Organic Chemistry, College of Chemistry
and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Huifei Wang
- Laboratory
of Chemical Genomics, School of Chemical Biology and Biotechnology, Shenzhen Graduate School of Peking University, Shenzhen 518055, China
| | - Bin Cheng
- The
State Key Laboratory of Applied Organic Chemistry, College of Chemistry
and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Hongbin Zhai
- Laboratory
of Chemical Genomics, School of Chemical Biology and Biotechnology, Shenzhen Graduate School of Peking University, Shenzhen 518055, China
| | - Yun Li
- The
State Key Laboratory of Applied Organic Chemistry, College of Chemistry
and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
- State
Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai
Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| |
Collapse
|
17
|
Meazza M, Polo V, Merino P, Rios R. Synergistic catalysis: enantioselective cyclopropanation of alkylidene benzoxazoles by Pd(ii) and secondary amine catalysis. Scope, limitations and mechanistic insight. Org Chem Front 2018. [DOI: 10.1039/c7qo00858a] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An enantioselective synergistic cascade cyclopropanation/NHC catalyzed ring opening has been reported. DFT calculations have been performed to confirm the mechanism.
Collapse
Affiliation(s)
- Marta Meazza
- School of Chemistry
- University of Southampton
- Southampton
- UK
| | - Victor Polo
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI) Campus San Francisco
- Universidad de Zaragoza
- 50009 Zaragoza
- Spain
| | - Pedro Merino
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI) Campus San Francisco
- Universidad de Zaragoza
- 50009 Zaragoza
- Spain
| | - Ramon Rios
- School of Chemistry
- University of Southampton
- Southampton
- UK
| |
Collapse
|
18
|
Suzuki H, Igarashi R, Yamashita Y, Kobayashi S. Catalytic Direct-type 1,4-Addition Reactions of Alkylazaarenes. Angew Chem Int Ed Engl 2017; 56:4520-4524. [DOI: 10.1002/anie.201611374] [Citation(s) in RCA: 62] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2016] [Revised: 02/01/2017] [Indexed: 12/20/2022]
Affiliation(s)
- Hirotsugu Suzuki
- Department of Chemistry; School of Science; The University of Tokyo; Hongo, Bunkyo-ku Tokyo Japan
| | - Ryo Igarashi
- Department of Chemistry; School of Science; The University of Tokyo; Hongo, Bunkyo-ku Tokyo Japan
| | - Yasuhiro Yamashita
- Department of Chemistry; School of Science; The University of Tokyo; Hongo, Bunkyo-ku Tokyo Japan
| | - Shū Kobayashi
- Department of Chemistry; School of Science; The University of Tokyo; Hongo, Bunkyo-ku Tokyo Japan
| |
Collapse
|
19
|
Suzuki H, Igarashi R, Yamashita Y, Kobayashi S. Catalytic Direct-type 1,4-Addition Reactions of Alkylazaarenes. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201611374] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Hirotsugu Suzuki
- Department of Chemistry; School of Science; The University of Tokyo; Hongo, Bunkyo-ku Tokyo Japan
| | - Ryo Igarashi
- Department of Chemistry; School of Science; The University of Tokyo; Hongo, Bunkyo-ku Tokyo Japan
| | - Yasuhiro Yamashita
- Department of Chemistry; School of Science; The University of Tokyo; Hongo, Bunkyo-ku Tokyo Japan
| | - Shū Kobayashi
- Department of Chemistry; School of Science; The University of Tokyo; Hongo, Bunkyo-ku Tokyo Japan
| |
Collapse
|
20
|
Synergistic Diastereo‐ and Enantioselective Functionalization of Unactivated Alkyl Quinolines with α,β‐Unsaturated Aldehydes. Angew Chem Int Ed Engl 2017; 56:1634-1638. [DOI: 10.1002/anie.201611306] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2016] [Indexed: 12/17/2022]
|
21
|
Meazza M, Potter M, Pitak MB, Coles SJ, Mazzanti A, Rios R. Highly Enantioselective Synthesis of Alkylpyridine Derivatives through a Michael/Michael/Aldol Cascade Reaction. European J Org Chem 2017. [DOI: 10.1002/ejoc.201601491] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Marta Meazza
- School of Chemistry; University of Southampton; Southampton UK
| | - Michael Potter
- School of Chemistry; University of Southampton; Southampton UK
| | - Mateusz B. Pitak
- UK National Crystallography Service; School of Chemistry; University of Southampton; Southampton UK
| | - Simon J. Coles
- UK National Crystallography Service; School of Chemistry; University of Southampton; Southampton UK
| | - Andrea Mazzanti
- Department of Industrial Chemistry “Toso Montanari”; School of Science; University of Bologna; Viale Risorgimento 4 40136 Bologna Italy
| | - Ramon Rios
- School of Chemistry; University of Southampton; Southampton UK
| |
Collapse
|
22
|
Meazza M, Tur F, Hammer N, Jørgensen KA. Synergistic Diastereo- and Enantioselective Functionalization of Unactivated Alkyl Quinolines with α,β-Unsaturated Aldehydes. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201611306] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Marta Meazza
- Department of Chemistry; Aarhus University; 8000 Aarhus C Denmark
| | - Fernando Tur
- Department of Chemistry; Aarhus University; 8000 Aarhus C Denmark
| | - Niels Hammer
- Department of Chemistry; Aarhus University; 8000 Aarhus C Denmark
| | | |
Collapse
|
23
|
Abstract
This review collects the major progress in the field of enantioselective transformations promoted by chiral silver catalysts, covering the literature since 2008, well illustrating the power of these especially mild Lewis acid catalysts to provide novel asymmetric reactions.
Collapse
Affiliation(s)
- Hélène Pellissier
- Aix Marseille Univ., CNRS , Centrale Marseille, iSm2, Marseille, France
| |
Collapse
|
24
|
Afewerki S, Córdova A. Combinations of Aminocatalysts and Metal Catalysts: A Powerful Cooperative Approach in Selective Organic Synthesis. Chem Rev 2016; 116:13512-13570. [PMID: 27723291 DOI: 10.1021/acs.chemrev.6b00226] [Citation(s) in RCA: 322] [Impact Index Per Article: 40.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The cooperation and interplay between organic and metal catalyst systems is of utmost importance in nature and chemical synthesis. Here innovative and selective cooperative catalyst systems can be designed by combining two catalysts that complement rather than inhibit one another. This refined strategy can permit chemical transformations unmanageable by either of the catalysts alone. This review summarizes innovations and developments in selective organic synthesis that have used cooperative dual catalysis by combining simple aminocatalysts with metal catalysts. Considerable efforts have been devoted to this fruitful field. This emerging area employs the different activation modes of amine and metal catalysts as a platform to address challenging reactions. Here, aminocatalysis (e.g., enamine activation catalysis, iminium activation catalysis, single occupied molecular orbital (SOMO) activation catalysis, and photoredox activation catalysis) is employed to activate unreactive carbonyl substrates. The transition metal catalyst complements by activating a variety of substrates through a range of interactions (e.g., electrophilic π-allyl complex formation, Lewis acid activation, allenylidene complex formation, photoredox activation, C-H activation, etc.), and thereby novel concepts within catalysis are created. The inclusion of heterogeneous catalysis strategies allows for "green" chemistry development, catalyst recyclability, and the more eco-friendly synthesis of valuable compounds.
Collapse
Affiliation(s)
- Samson Afewerki
- Department of Natural Sciences, Mid Sweden University , SE-851 70 Sundsvall, Sweden.,Berzelii Center EXSELENT, The Arrhenius Laboratory, Stockholm University , SE-106 91 Stockholm, Sweden
| | - Armando Córdova
- Department of Natural Sciences, Mid Sweden University , SE-851 70 Sundsvall, Sweden.,Berzelii Center EXSELENT, The Arrhenius Laboratory, Stockholm University , SE-106 91 Stockholm, Sweden
| |
Collapse
|
25
|
Roudier M, Constantieux T, Quintard A, Rodriguez J. Triple Iron/Copper/Iminium Activation for the Efficient Redox Neutral Catalytic Enantioselective Functionalization of Allylic Alcohols. ACS Catal 2016. [DOI: 10.1021/acscatal.6b01102] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Mylène Roudier
- Aix Marseille Univ, CNRS, Centrale Marseille, iSm2, Marseille 13397, France
| | | | - Adrien Quintard
- Aix Marseille Univ, CNRS, Centrale Marseille, iSm2, Marseille 13397, France
| | - Jean Rodriguez
- Aix Marseille Univ, CNRS, Centrale Marseille, iSm2, Marseille 13397, France
| |
Collapse
|
26
|
Meazza M, Rios R. Synergistic Catalysis: Enantioselective Ring Expansion of Vinyl Cyclopropanes Combining Four Catalytic Cycles for the Synthesis of Highly Substituted Spirocyclopentanes Bearing up to Four Stereocenters. Chemistry 2016; 22:9923-8. [PMID: 27198468 DOI: 10.1002/chem.201601893] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2016] [Indexed: 01/01/2023]
Abstract
A double synergistic cascade reaction is reported, combining transition metal and amine catalysis. The reaction between vinyl cyclopropanes and enals renders the final cyclopentane derivatives in excellent yields and stereoselectivities.
Collapse
Affiliation(s)
- Marta Meazza
- School of Chemistry, University of Southampton, UK
| | - Ramon Rios
- School of Chemistry, University of Southampton, UK.
| |
Collapse
|
27
|
Meazza M, Light ME, Mazzanti A, Rios R. Synergistic catalysis: cis-cyclopropanation of benzoxazoles. Chem Sci 2016; 7:984-988. [PMID: 29081942 PMCID: PMC5633913 DOI: 10.1039/c5sc03597j] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2015] [Accepted: 10/30/2015] [Indexed: 11/25/2022] Open
Abstract
In the present paper we report our latest efforts in pushing the boundaries of synergistic catalysis. We propose the use of 3 different catalytic cycles working in concert for the formation of cis cyclopropane derivatives of benzoxazoles with excellent stereoselectivities. This is the proof of concept that synergistic catalysis could be successfully used in cascade reactions.
Collapse
Affiliation(s)
- Marta Meazza
- Faculty of Natural & Environmental Sciences , University of Southampton , Highfield Campus , Southampton , SO17 1BJ , UK . ; http://www.riosresearchgroup.com
| | - Mark E Light
- Faculty of Natural & Environmental Sciences , University of Southampton , Highfield Campus , Southampton , SO17 1BJ , UK . ; http://www.riosresearchgroup.com
| | - Andrea Mazzanti
- Department of Industrial Chemistry "Toso Montanari" , School of Science , University of Bologna , Viale Risorgimento 4 , 40136 Bologna , Italy
| | - Ramon Rios
- Faculty of Natural & Environmental Sciences , University of Southampton , Highfield Campus , Southampton , SO17 1BJ , UK . ; http://www.riosresearchgroup.com
| |
Collapse
|
28
|
Ceban V, Tauchman J, Meazza M, Gallagher G, Light ME, Gergelitsová I, Veselý J, Rios R. Expanding the scope of Metal-Free enantioselective allylic substitutions: Anthrones. Sci Rep 2015; 5:16886. [PMID: 26592555 PMCID: PMC4655356 DOI: 10.1038/srep16886] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Accepted: 10/19/2015] [Indexed: 11/09/2022] Open
Abstract
The highly enantioselective asymmetric allylic alkylation of Morita–Baylis–Hillman carbonates with anthrones is presented. The reaction is simply catalyzed by cinchona alkaloid derivatives affording the final alkylated products in good yields and excellent enantioselectivities.
Collapse
Affiliation(s)
- Victor Ceban
- School of Chemistry, University of Southampton, Highfield Campus SO17 1BJ, UK
| | - Jiří Tauchman
- School of Chemistry, University of Southampton, Highfield Campus SO17 1BJ, UK.,Department of Organic Chemistry, Charles University in Prague, 128 43 Praha 2, Czech Republic
| | - Marta Meazza
- School of Chemistry, University of Southampton, Highfield Campus SO17 1BJ, UK
| | - Greg Gallagher
- School of Chemistry, University of Southampton, Highfield Campus SO17 1BJ, UK
| | - Mark E Light
- School of Chemistry, University of Southampton, Highfield Campus SO17 1BJ, UK
| | - Ivana Gergelitsová
- Department of Organic Chemistry, Charles University in Prague, 128 43 Praha 2, Czech Republic
| | - Jan Veselý
- Department of Organic Chemistry, Charles University in Prague, 128 43 Praha 2, Czech Republic
| | - Ramon Rios
- School of Chemistry, University of Southampton, Highfield Campus SO17 1BJ, UK
| |
Collapse
|
29
|
Wang S, Li X, Liu H, Xu L, Zhuang J, Li J, Li H, Wang W. Organocatalytic Enantioselective Direct Additions of Aldehydes to 4-Vinylpyridines and Electron-Deficient Vinylarenes and Their Synthetic Applications. J Am Chem Soc 2015; 137:2303-10. [DOI: 10.1021/ja511143b] [Citation(s) in RCA: 72] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Sinan Wang
- Shanghai
Key Laboratory of New Drug Design, School of Pharmacy, and State Key
Laboratory of Bioengineering Reactor, East China University of Science and Technology, 130 Mei-long Road, Shanghai 200237, China
| | - Xiangmin Li
- Shanghai
Key Laboratory of New Drug Design, School of Pharmacy, and State Key
Laboratory of Bioengineering Reactor, East China University of Science and Technology, 130 Mei-long Road, Shanghai 200237, China
- Department
of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131-0001, United States
| | - Hongwei Liu
- Shanghai
Key Laboratory of New Drug Design, School of Pharmacy, and State Key
Laboratory of Bioengineering Reactor, East China University of Science and Technology, 130 Mei-long Road, Shanghai 200237, China
| | - Li Xu
- Shanghai
Key Laboratory of New Drug Design, School of Pharmacy, and State Key
Laboratory of Bioengineering Reactor, East China University of Science and Technology, 130 Mei-long Road, Shanghai 200237, China
| | - Jinchen Zhuang
- Shanghai
Key Laboratory of New Drug Design, School of Pharmacy, and State Key
Laboratory of Bioengineering Reactor, East China University of Science and Technology, 130 Mei-long Road, Shanghai 200237, China
| | - Jian Li
- Shanghai
Key Laboratory of New Drug Design, School of Pharmacy, and State Key
Laboratory of Bioengineering Reactor, East China University of Science and Technology, 130 Mei-long Road, Shanghai 200237, China
| | - Hao Li
- Shanghai
Key Laboratory of New Drug Design, School of Pharmacy, and State Key
Laboratory of Bioengineering Reactor, East China University of Science and Technology, 130 Mei-long Road, Shanghai 200237, China
| | - Wei Wang
- Shanghai
Key Laboratory of New Drug Design, School of Pharmacy, and State Key
Laboratory of Bioengineering Reactor, East China University of Science and Technology, 130 Mei-long Road, Shanghai 200237, China
- Department
of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131-0001, United States
| |
Collapse
|
30
|
Quintard A, Rodriguez J. Synergistic Cu–amine catalysis for the enantioselective synthesis of chiral cyclohexenones. Chem Commun (Camb) 2015; 51:9523-6. [DOI: 10.1039/c5cc02987b] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An unprecedented utilization of 1,3-acetonedicarboxylic acid as a 1,3-bis-pro-nucleophile and a reactive acetone surrogate in enantioselective catalysis has been reported.
Collapse
Affiliation(s)
- A. Quintard
- Aix Marseille Université
- Centrale Marseille
- CNRS
- Marseille
- France
| | - J. Rodriguez
- Aix Marseille Université
- Centrale Marseille
- CNRS
- Marseille
- France
| |
Collapse
|
31
|
Abstract
This review focuses on enantioselective cooperative catalytic reactions, wherein two catalysts work simultaneously to form products which cannot be obtained by the use of a single catalyst alone, which have attracted considerable attention in recent years.
Collapse
Affiliation(s)
- Suleman M. Inamdar
- Division of Organic Chemistry
- CSIR-National Chemical Laboratory
- Pune 411 008
- India
| | - Valmik S. Shinde
- Division of Organic Chemistry
- CSIR-National Chemical Laboratory
- Pune 411 008
- India
| | - Nitin T. Patil
- Division of Organic Chemistry
- CSIR-National Chemical Laboratory
- Pune 411 008
- India
| |
Collapse
|
32
|
Yao L, Wang CJ. AsymmetricN-Allylic Alkylation of Hydrazones with Morita-Baylis-Hillman Carbonates. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201400790] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
33
|
Meazza M, Ceban V, Pitak MB, Coles SJ, Rios R. Synergistic catalysis: enantioselective addition of alkylbenzoxazoles to enals. Chemistry 2014; 20:16853-7. [PMID: 25352171 DOI: 10.1002/chem.201404565] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2014] [Indexed: 01/25/2023]
Abstract
A novel catalytic enantioselective methodology based on synergistic catalysis is reported. The strategy involves: 1) the metal-Lewis-acid activation of alkylazaarenes, and 2) the secondary-amine activation of enals. Consequently, highly functionalized chiral alkylazaarenes were obtained in good yields and with reasonable stereoselectivity.
Collapse
Affiliation(s)
- Marta Meazza
- Faculty of Natural and Environmental Sciences, University of Southampton, Highfield Campus, Southampton, SO17 1BJ (UK) www.riosresearchgroup.com
| | | | | | | | | |
Collapse
|
34
|
Ren CL, Zhang T, Wang XY, Wu T, Ma J, Xuan QQ, Wei F, Huang HY, Wang D, Liu L. Highly enantioselective reaction of 2-oxindoles with (3-indolyl)methanols by cooperative Catalysis of a Lewis acid and organocatalyst. Org Biomol Chem 2014; 12:9881-6. [DOI: 10.1039/c4ob02035a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|