Pd-catalyzed couplings of (α-fluoro)vinyl tris(trimethylsilyl)germanes
作者:Zhizhong Wang、Aurelio Gonzalez、Stanislaw F. Wnuk
DOI:10.1016/j.tetlet.2005.06.023
日期:2005.8
The (alpha-fluoro)vinyl tris(trimethylsilyl)germanes undergo Pd-catalyzed cross-couplings with aryl and alkenyl halides upon oxidative treatment with hydrogen peroxide under basic aqueous conditions to give access to fluoroalkenes and fluorodienes with retention of stereochemistry. (c) 2005 Elsevier Ltd. All rights reserved.
Synthesis of the Multisubstituted Halogenated Olefins via Cross-Coupling of Dihaloalkenes with Alkylzinc Bromides
作者:Daniela Andrei、Stanislaw F. Wnuk
DOI:10.1021/jo051980e
日期:2006.1.1
The 1-fluoro-1-haloalkenes undergo Pd-catalyzed Negishi cross-couplings with primary alkylzinc bromides to give multisubstituted fluoroalkenes. The alkylation was trans-selective giving pure Z-fluoroalkenes in most cases. The highest yields were obtained with Pd-2(dba)(3) and PdCl2(dppb) catalysts but the best stereochemical outcome was obtained with less reactive Pd(PPh3)(4). The tertiary alkylzincs also produced desired fluoroalkenes in high yields. Coupling of beta,beta-dichloro styrene with organozinc reagent resulted in the formation of monocoupled product.
Concise preparation of fluorine-containing carbocycles involving the Diels–Alder reaction using fluorinated alkene or diene derivatives
作者:S. Yamada、K. Hondo、T. Konno、T. Ishihara
DOI:10.1039/c6ra00569a
日期:——
The Diels–Alderreaction of trifluorovinyl substances with various dienes proceeded well to give the corresponding trifluorinated cyclohexene derivatives in a regiospecific manner, while 2,3-difluorobuta-1,3-diene molecules also underwent a smooth Diels–Alderreaction with various dienophiles to afford the corresponding vic-difluorocyclohexene structure.