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Jiao M, Long J, Chen J, Yang H, Wang T, Fang X. Nickel-Catalyzed Regio- and Enantioselective Migratory Hydrocyanation of Internal Alkenes: Expanding the Scope to α,ω-Diaryl Internal Alkenes. Angew Chem Int Ed Engl 2024; 63:e202402390. [PMID: 38523071 DOI: 10.1002/anie.202402390] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2024] [Revised: 03/11/2024] [Accepted: 03/22/2024] [Indexed: 03/26/2024]
Abstract
Metal-hydride-catalyzed migratory functionalization of alkenes witnessed extensive development in the past few years. However, the asymmetric version of this reaction has remained largely underdeveloped owing to the difficulty in simultaneous control of both regio- and stereoselectivity. In addition, exploring the wider alkene substrate scope to enable more synthetically valuable applications represents another challenge in this field. In this context, a nickel-catalyzed asymmetric hydrocyanation of internal alkenes involving a chain-walking process is demonstrated. The reaction exhibits excellent regio- and enantioselectivity, proceeds under mild reaction conditions, and delivers benzylic nitriles in high yields. Even α,ω-diaryl internal alkenes, which are known to be one of the most challenging substrates of this type, could be successfully converted to the desired products with good regio- and stereoselectivity by modifying the electronic and steric effects. Theoretical calculations suggest that the η3-benzyl coordination mode and the aryl substituent (3,5-(OMe)2C6H3) on the diphosphite ligand are both key factors in regulating regio- and enantioselectivity.
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Affiliation(s)
- Mingdong Jiao
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Key Laboratory of Organosilicon Material Technology of Zhejiang Province, College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, 2318 Yuhangtang Road, Hangzhou, 311121, P. R. China
- College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan, 410083, P. R. China
| | - Jinguo Long
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Key Laboratory of Organosilicon Material Technology of Zhejiang Province, College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, 2318 Yuhangtang Road, Hangzhou, 311121, P. R. China
| | - Jianxi Chen
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Key Laboratory of Organosilicon Material Technology of Zhejiang Province, College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, 2318 Yuhangtang Road, Hangzhou, 311121, P. R. China
| | - Hua Yang
- College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan, 410083, P. R. China
| | - Ting Wang
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Key Laboratory of Organosilicon Material Technology of Zhejiang Province, College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, 2318 Yuhangtang Road, Hangzhou, 311121, P. R. China
| | - Xianjie Fang
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Key Laboratory of Organosilicon Material Technology of Zhejiang Province, College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, 2318 Yuhangtang Road, Hangzhou, 311121, P. R. China
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Yang H, Poznik M, Tang S, Xue P, Du L, Liu C, Chen X, Chruma JJ. Synthesis of Conformationally Liberated Yohimbine Analogues and Evaluation of Cytotoxic Activity. ACS OMEGA 2021; 6:19291-19303. [PMID: 34337266 PMCID: PMC8320076 DOI: 10.1021/acsomega.1c02784] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Accepted: 07/07/2021] [Indexed: 05/09/2023]
Abstract
A modular synthetic approach to strategically unique structural analogues of the alkaloid yohimbine is reported. The overall synthetic strategy couples the transition-metal-catalyzed decarboxylative allylation of 2,2-diphenylglycinate imino esters with a scandium triflate-mediated highly endo-selective intramolecular Diels-Alder (IMDA) cycloaddition to generate a small collection of de-rigidified yohimbine analogues lacking the ethylene linkage between the indole and decahydroisoquinoline units. One compound generated in this study contains an unprecedented pentacyclic urea core and appears to demonstrate increased cytotoxicity against the gastric cancer cell line SGC-7901 in comparison to a pancreatic cancer cell line (PATU-8988) and a normal human gastric mucosal cell line (GES-1).
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Affiliation(s)
- Han Yang
- Key
Laboratory of Green Chemistry & Technology (MOE), College of Chemistry
and Sino-British Materials Research Institute, College of Physical
Sciences & Technology, Sichuan University, Chengdu, Sichuan 610064, P. R. China
| | - Michal Poznik
- Key
Laboratory of Green Chemistry & Technology (MOE), College of Chemistry
and Sino-British Materials Research Institute, College of Physical
Sciences & Technology, Sichuan University, Chengdu, Sichuan 610064, P. R. China
| | - Shaojian Tang
- School
of Pharmacy, Weifang Medical University, No. 7166, Baotong West Road, Weifang, Shandong 261053, P. R. China
| | - Peng Xue
- School
of Public Health, Weifang Medical University, No. 7166, Baotong West Road, Weifang, Shandong 261053, P. R. China
| | - Lidong Du
- School
of Clinical Medicine, Weifang Medical University, No. 7166, Baotong West Road, Weifang, Shandong 261053, P. R. China
| | - Chenlu Liu
- Key
Laboratory of Green Chemistry & Technology (MOE), College of Chemistry
and Sino-British Materials Research Institute, College of Physical
Sciences & Technology, Sichuan University, Chengdu, Sichuan 610064, P. R. China
| | - Xiaochuan Chen
- Key
Laboratory of Green Chemistry & Technology (MOE), College of Chemistry
and Sino-British Materials Research Institute, College of Physical
Sciences & Technology, Sichuan University, Chengdu, Sichuan 610064, P. R. China
| | - Jason J. Chruma
- Key
Laboratory of Green Chemistry & Technology (MOE), College of Chemistry
and Sino-British Materials Research Institute, College of Physical
Sciences & Technology, Sichuan University, Chengdu, Sichuan 610064, P. R. China
- Department
of Chemistry, University of Virginia, McCormick Road, PO Box 400319, Charlottesville, Virginia 22903-4319, United States
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Mori-Quiroz LM, Londhe SS, Clift MD. Formal α-Allylation of Primary Amines by a Dearomative, Palladium-Catalyzed Umpolung Allylation of N-(Aryloxy)imines. J Org Chem 2020; 85:14827-14846. [PMID: 33152244 DOI: 10.1021/acs.joc.0c01020] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
N-(Aryloxy)imines, readily accessible by condensation/tautomerization of (pseudo)benzylic primary amines and 2,6-di-tert-butyl-1,4-benzoquinone, undergo efficient allylation to afford a wide range of homoallylic primary amines following hydrolytic workup. Deprotonation of N-(aryloxy)imines generates a delocalized 2-azaallyl anion-type nucleophile that engages in dearomative C-C bond-forming reactions with allylpalladium(II) electrophiles generated from allylic tert-butyl carbonates. This reactivity umpolung enables the formal α-allylation of (pseudo)benzylic primary amines. Mechanistic studies reveal that the apparent regioselectivity of the desired bond-forming event is a convergent process that is initiated by unselective allylation of N-(aryloxy)imines to give several regioisomeric species, which subsequently rearrange via stepwise [1,3]- or concerted [3,3]-sigmatropic shifts, ultimately converging to provide the desired regioisomer of the amine products.
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Affiliation(s)
- Luis M Mori-Quiroz
- Department of Chemistry, The University of Kansas, 1140 Gray-Little Hall, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
| | - Shrikant S Londhe
- Department of Chemistry, The University of Kansas, 1140 Gray-Little Hall, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
| | - Michael D Clift
- Department of Chemistry, The University of Kansas, 1140 Gray-Little Hall, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
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Tsuji H, Kawatsura M. Transition‐Metal‐Catalyzed Propargylic Substitution of Propargylic Alcohol Derivatives Bearing an Internal Alkyne Group. ASIAN J ORG CHEM 2020. [DOI: 10.1002/ajoc.202000422] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Hiroaki Tsuji
- Department of Chemistry, College of Humanities & Sciences Nihon University Sakurajosui, Setagaya-ku Tokyo 156-8550 Japan
| | - Motoi Kawatsura
- Department of Chemistry, College of Humanities & Sciences Nihon University Sakurajosui, Setagaya-ku Tokyo 156-8550 Japan
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O’Broin CQ, Guiry PJ. Advances in Decarboxylative Palladium-Catalyzed Reactions of Propargyl Electrophiles. J Org Chem 2020; 85:10321-10333. [DOI: 10.1021/acs.joc.0c01218] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Calvin Q. O’Broin
- Centre for Synthesis and Chemical Biology, School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland
| | - Patrick J. Guiry
- Centre for Synthesis and Chemical Biology, School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland
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