Nucleophilic Substitution of <i>gem</i>-Difluoroalkenes with TMSNu Promoted by Catalytic Amounts of Cs<sub>2</sub>CO<sub>3</sub>
作者:Ling-Feng Jiang、Bing-Tao Ren、Bin Li、Guang-Yi Zhang、Yi Peng、Zhen-Yu Guan、Qing-Hai Deng
DOI:10.1021/acs.joc.9b00999
日期:2019.6.7
The efficient and practical nucleophilic cyanation and trifluoromethylation with appropriate trimethylsilyl nucleophiles were developed. Catalytic amounts of cheap and nontoxic Cs2CO3 were used to maintain a sufficiently high concentration of nucleophilic anion (CN– or CF3–) which could begin the catalytic cycle. The present methodologies provide diverse functionalized monofluoroalkenes bearing a cyano
开发了有效和实用的亲核氰化和三氟甲基化反应以及适当的三甲基甲硅烷基亲核试剂。廉价和无毒性的Cs的催化量的2 CO 3被用来维持亲核阴离子(CN的足够高的浓度-或CF 3 - ),其可以开始催化循环。本方法提供了带有氰基和三氟甲基的各种官能化的单氟烯烃,具有优异至中等的立体选择性。
Stereoselective cyanation of β-bromo-β-fluorostyrenes using potassium cyanide and promoted by (CH3CN)4Cu+ BF4−
A general method for the synthesis of alpha-fluorocinnamonitrile based on the stereoselective reaction between beta-bromo-beta-fluorostyrene and potassium cyanide, promoted by (CH3CN)(4)Cu+ BF4- in 1-methyl-2-pyrrolidinone (NMP), is described. (C) 2011 Elsevier Ltd. All rights reserved.
Stereoselective synthesis of α-fluoroacrylonitriles <i>via</i> organocatalytic cyanation of <i>gem</i>-difluoroalkenes and TMSCN
作者:Yu-Chuan Ma、Yang Zhang、Cheng-Zhi Gu、Guang-Fen Du、Lin He
DOI:10.1039/c9nj02370d
日期:——
An organocatalytic cyanationreaction of gem-difluoroalkenes was developed. Under the catalysis of 10 mol% DBU, gem-difluoroalkenes undergo a nucleophilic addition-β-elimination reaction with trimethylsilylcyanide to provide α-fluoroacrylonitriles in 50–98% yields with excellent Z/E selectivity.