Free-radical approach to the synthesis of fluorine-substituted cyclic compounds. Cyclization reactions of trifluoromethyl-and difluoromethylene-substituted carbon radicals
作者:Tsutomu Morikawa、Masayuki Uejima、Yoshiro Kobayashi、Takeo Taguchi
DOI:10.1016/s0022-1139(00)80477-7
日期:1993.11
Trifluoromethyl- or difluoromethylene-substituted alkyl radicals (CF3C or CF2C) and trifluoromethyl- substituted alkenyl radicals (CF3CC) cyclize effectively intramolecularly to allow the synthesis of fluorine- substituted cyclic compounds. Radical reactions of thiocarbonylimidazolide derivatives (7a,b, 13a–d, 14e,f) gave CF3-substituted cyclopentane derivatives (22a, 25a–d) or cyclohexane
三氟甲基或二氟亚甲基-取代的烷基基团(CF 3 C或CF 2 C)和三氟甲基取代的烯基的基团(CF 3 CC)环化分子内有效,以允许合成氟取代的环状化合物。硫代羰基咪唑啉衍生物(7a,b,13a–d,14e,f)的自由基反应通过5或6- exo选择性生成CF 3取代的环戊烷衍生物(22a,25a–d)或环己烷衍生物(22b,26e,f)环化。CF 3取代的环戊烯衍生物(27a,b)或环己烯衍生物(27c)也通过自由基环化从烯基碘化物(17a–c)中获得。含有CF 2 CO 2 Et基团的环戊烷衍生物(29a-f,31)是通过Reformatsky反应和自由基环化反应合成的。