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Tan Z, Yihuo A, Wu Z, Wang F, Dong S, Feng X. Concise synthesis of chiral γ-butenolides via an allylation/lactonization cascade reaction. Chem Commun (Camb) 2024. [PMID: 38982972 DOI: 10.1039/d4cc02781g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/11/2024]
Abstract
A highly enantioselective allylation/lactonization cascade was developed, which provides a concise and efficient route to chiral γ-butenolides under mild conditions. Most of the reaction examples can be completed in 10 minutes with high selectivity.
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Affiliation(s)
- Zheng Tan
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China.
| | - Aying Yihuo
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China.
| | - Zhao Wu
- Center for Natural Products Research, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610064, China
| | - Fei Wang
- Center for Natural Products Research, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610064, China
| | - Shunxi Dong
- 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.
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2
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Xu Y, Liu D, Gao F, Li S, Zhang X, Wang L, Yang D. Harnessing Dpp-Imine as a Powerful Achiral Cocatalyst to Dramatically Increase the Efficiency and Stereoselectivity in a Magnesium-Mediated Oxa-Michael Reaction. JACS AU 2024; 4:164-176. [PMID: 38274262 PMCID: PMC10806778 DOI: 10.1021/jacsau.3c00584] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/02/2023] [Revised: 12/06/2023] [Accepted: 12/11/2023] [Indexed: 01/27/2024]
Abstract
Dpp-imines are classic model substrates for synthetic method studies. Here, we disclose their powerful use as achiral coligands in metal-catalyzed reactions. It is highly interesting to find that the Dpp-imine can not only act as powerful ligand to create excellent chiral pockets with magnesium complexes but also, more importantly, this coligand can dramatically enhance the catalytic ability of the metal catalyst. The underlying reaction mechanism was extensively explored by conducting a series of experiments, including 31P NMR studies of the coordination complex between the Dpp-imine coligand and magnesium complexes, ESI capture results, multiple control experiments, studies and comparison of different coligands, 1H NMR studies on the relationship between the substrate and Dpp-imine coligand, as well as the relationship between the substrate and the full complexes. Furthermore, DFT calculation provided valuable insights in the role of the imine additive and demonstrated that adding the Dpp-imine coligand in the magnesium catalyst can switch the deprotonation/nucleophilic addition steps from a stepwise mechanism to a concerted process during the oxa-cyclization reaction. The crucial factors responsible for the excellent enantioselectivity and enhanced reaction efficiency brought by Dpp-imine have been extracted from the calculation model. These mechanistic experiments and DFT calculation data clearly disclose and prove the powerful and interesting functions of the Dpp-imine coligand, which also direct a novel application of this type of active imine as useful ligands in metal-catalyzed asymmetric reactions.
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Affiliation(s)
- Yingfan Xu
- Key
Laboratory of Preclinical Study for New Drugs of Gansu Province, School
of Basic Medical Sciences & Research Unit of Peptide Science,
2019RU066, Lanzhou University, Lanzhou 730000, Gansu, P. R. China
| | - Dan Liu
- Institute
of Systems and Physical Biology, Shenzhen
Bay Laboratory, Shenzhen 518055, P. R. China
| | - Feiyun Gao
- Key
Laboratory of Preclinical Study for New Drugs of Gansu Province, School
of Basic Medical Sciences & Research Unit of Peptide Science,
2019RU066, Lanzhou University, Lanzhou 730000, Gansu, P. R. China
| | - Shixin Li
- Key
Laboratory of Preclinical Study for New Drugs of Gansu Province, School
of Basic Medical Sciences & Research Unit of Peptide Science,
2019RU066, Lanzhou University, Lanzhou 730000, Gansu, P. R. China
| | - Xiaoyong Zhang
- Institute
of Systems and Physical Biology, Shenzhen
Bay Laboratory, Shenzhen 518055, P. R. China
| | - Linqing Wang
- Key
Laboratory of Preclinical Study for New Drugs of Gansu Province, School
of Basic Medical Sciences & Research Unit of Peptide Science,
2019RU066, Lanzhou University, Lanzhou 730000, Gansu, P. R. China
| | - Dongxu Yang
- Key
Laboratory of Preclinical Study for New Drugs of Gansu Province, School
of Basic Medical Sciences & Research Unit of Peptide Science,
2019RU066, Lanzhou University, Lanzhou 730000, Gansu, P. R. China
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3
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Cui J, Oriez R, Samanta S, Noda H, Watanabe T, Shibasaki M. Catalytic Asymmetric Vinylogous Conjugate Addition of Butenolide to 2-Ester-Substituted Chromones: Access to Chiral Chromanone Lactones via Trapping of a Copper(I) Enolate by Trimethyl Borate. Org Lett 2023; 25:8367-8371. [PMID: 37962864 DOI: 10.1021/acs.orglett.3c03503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2023]
Abstract
A copper-catalyzed asymmetric vinylogous conjugate addition of butenolide to 2-ester-substituted chromones is described, and it delivers syn- or anti-chromanone lactones with high stereoselectivities. The enantioselectivity-determining step varied with the use of B(OMe)3 as an additive, resulting in enhanced stereoselectivities, as revealed by density functional theory calculations, which also provided theoretical insight into the origin of the ligand-dependent diastereodivergence.
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Affiliation(s)
- Jin Cui
- Institute of Microbial Chemistry (BIKAKEN), Tokyo, 3-14-23 Kamiosaki Shinagawa-ku, Tokyo 141-0021, Japan
- Center for Innovative Drug Discovery, Greater Bay Area Institute of Precision Medicine (Guangzhou), School of Pharmacy, Fudan University, Shanghai 200437, P.R. China
| | - Raphaël Oriez
- Institute of Microbial Chemistry (BIKAKEN), Tokyo, 3-14-23 Kamiosaki Shinagawa-ku, Tokyo 141-0021, Japan
| | - Sadhanendu Samanta
- Institute of Microbial Chemistry (BIKAKEN), Tokyo, 3-14-23 Kamiosaki Shinagawa-ku, Tokyo 141-0021, Japan
| | - Hidetoshi Noda
- Institute of Microbial Chemistry (BIKAKEN), Tokyo, 3-14-23 Kamiosaki Shinagawa-ku, Tokyo 141-0021, Japan
| | - Takumi Watanabe
- Institute of Microbial Chemistry (BIKAKEN), Tokyo, 3-14-23 Kamiosaki Shinagawa-ku, Tokyo 141-0021, Japan
| | - Masakatsu Shibasaki
- Institute of Microbial Chemistry (BIKAKEN), Tokyo, 3-14-23 Kamiosaki Shinagawa-ku, Tokyo 141-0021, Japan
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4
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Wang S, Zhu C, Ning L, Li D, Feng X, Dong S. Regioselective C-H alkylation of anisoles with olefins by cationic imidazolin-2-iminato scandium(iii) alkyl complexes. Chem Sci 2023; 14:3132-3139. [PMID: 36970095 PMCID: PMC10033784 DOI: 10.1039/d2sc06725k] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Accepted: 01/20/2023] [Indexed: 01/22/2023] Open
Abstract
A new type of rare-earth alkyl complexes supported by monoanionic imidazolin-2-iminato ligands were synthesised and structurally characterised by X-ray diffraction and NMR analyses. The utility of these imidazolin-2-iminato rare-earth alkyl complexes in organic synthesis was demonstrated by their performance in highly regioselective C-H alkylation of anisoles with olefins. With as low as 0.5 mol% catalyst loading, various anisole derivatives without ortho-substitution or 2-methyl substituted anisoles reacted with several alkenes under mild conditions, producing the corresponding ortho-Csp2-H and benzylic Csp3-H alkylation products in high yield (56 examples, 16-99% yields). Control experiments revealed that rare-earth ions, ancillary imidazolin-2-iminato ligands, and basic ligands were crucial for the above transformations. Based on deuterium-labelling experiments, reaction kinetic studies, and theoretical calculations, a possible catalytic cycle was provided to elucidate the reaction mechanism.
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Affiliation(s)
- Shiyu Wang
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University Chengdu 610064 China
| | - Chenhao Zhu
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University Chengdu 610064 China
| | - Lichao Ning
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University Chengdu 610064 China
| | - Dawei Li
- 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
| | - Shunxi Dong
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University Chengdu 610064 China
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5
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Lin Y, Wan JP, Liu Y. Cascade in Situ Iodination, Chromone Annulation, and Cyanation for Site-Selective Synthesis of 2-Cyanochromones. J Org Chem 2023; 88:4017-4023. [PMID: 36862999 DOI: 10.1021/acs.joc.3c00206] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/04/2023]
Abstract
A facile cascade reaction for the site selective synthesis of 2-cyanochromones is described. By using simple o-hydroxyphenyl enaminones and potassium ferrocyanide trihydrate (K4[Fe(CN)6]3·3H2O) as starting materials and I2/AlCl3 as promoters, the products are furnished via tandem chromone ring formation and C-H cyanation. The in situ formation of 3-iodochromone and a formal 1,2-hydrogen atom transfer (HAT) process account for the unconventional site selectivity. In addition, the synthesis of 2-cyanoquinolin-4-one has been realized by employing corresponding 2-aminophenyl enaminone as substrate.
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Affiliation(s)
- Yan Lin
- National Engineering Research Center for Carbohydrate Synthesis, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
| | - Jie-Ping Wan
- National Engineering Research Center for Carbohydrate Synthesis, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China
| | - Yunyun Liu
- National Engineering Research Center for Carbohydrate Synthesis, College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, China.,International Innovation Center for Forest Chemicals and Materials, Nanjing Forestry University, Nanjing 210037, China
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6
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Samanta S, Cui J, Noda H, Watanabe T, Shibasaki M. Asymmetric Syn-Selective Vinylogous Addition of Butenolides to Chromones via Al-Li-BINOL Catalysis. J Org Chem 2023; 88:1177-1184. [PMID: 36622901 DOI: 10.1021/acs.joc.2c02731] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
A gram-scale syn-selective asymmetric vinylogous addition of butenolides to chromones, catalyzed by an Al-Li-BINOL (ALB) complex, was developed in this study. For various combinations of substrates, the observed diastereoselectivity approached 20:1 with 84-98% ee. This protocol is complementary to previously reported ones and improves the selectivity for several chromones. This methodology can be applied to a quinolone substrate, affording another type of heterocyclic scaffolds substituted with five-membered lactones. Computational studies support the role of ALB as a bifunctional catalyst in this reaction and provide insights into the origin of the observed stereoselectivity.
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Affiliation(s)
| | - Jin Cui
- Institute of Microbial Chemistry, Tokyo 141-0021, BIKAKEN, Japan
| | - Hidetoshi Noda
- Institute of Microbial Chemistry, Tokyo 141-0021, BIKAKEN, Japan
| | - Takumi Watanabe
- Institute of Microbial Chemistry, Tokyo 141-0021, BIKAKEN, Japan
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7
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Mo Y, Chen Q, Li J, Ye D, Zhou Y, Dong S, Liu X, Feng X. Asymmetric Catalytic Conjugate Addition of Cyanide to Chromones and β-Substituted Cyclohexenones. ACS Catal 2022. [DOI: 10.1021/acscatal.2c05509] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Yuhao Mo
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Qiyou Chen
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Jinzhao Li
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Dong Ye
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Yuqiao Zhou
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, China
| | - Shunxi Dong
- 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
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