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。
α-Fluoroacrylonitriles: Horner–Wittig synthesis and conversion into 2-fluoroallylamines and C-(1-fluorovinyl)nitrones
作者:Jan Hein van Steenis、Adrianus M.C.H van den Nieuwendijk、Arne van der Gen
DOI:10.1016/j.jfluchem.2003.11.001
日期:2004.1
alpha-Fluoroacrylonitriles 2 were synthesized in moderate to good yields by Homer-Wittig (HW) reaction of aldehydes and ketones with (diphenylphosphinoyl)fluoroacetonitrile (1), prepared in situ from commercially available fluoroacetonitrile and diphenylphosphinyl chloride. New synthetic applications of 2 are presented with the one-pot conversion into 2-fluoroallylamines 6 and C-(1-fluorovinyl)nitrones 8 through a diisobutylaluminum hydride (DIBALH)-reduction transimination protocol. The scope and limitations of this procedure are discussed. (C) 2003 Elsevier B.V. All rights reserved.
Preparation of fluoroalkenes from fluoroacetonitrile