作者:Shozo Fujii、Yasuo Maki、Hiroshi Kimoto、Louis A. Cohen
DOI:10.1016/s0022-1139(00)81992-2
日期:1987.4
yields of 19% and 27%, respectively. Alkaline hydrolysis converts the 2-pentafluoroethyl group to trifluoroacetyl. The reaction mechanism, involving a diazafulvene intermediate, is analogous to that elucidated for (trifluoromethyl)imidazoles; however, the pentafluoroethyl group is markedly more reactive to hydrolysis than the trifluoromethyl group. For imidazole derivatives, the ratio of reactivities is
组胺和L-组氨酸甲酯的N-三氟乙酰基衍生物被五氟乙基自由基的光化学环取代提供相应的2-和4-五氟乙基化产物,产率分别为19%和27%。碱水解将2-五氟乙基转化为三氟乙酰基。涉及二氮杂富烯中间体的反应机理类似于对(三氟甲基)咪唑的阐明。但是,五氟乙基比三氟甲基对水解的反应性强。对于咪唑衍生物,反应性比率在C-2处为75,在C-4处为40。4-(五氟乙基)组胺的水解得到双环产物4-(三氟甲基)-6,7-二氢-1H-咪唑并[4,5-c]-吡啶,产率为65.4%。