A Friedel–Crafts-type alkylation reaction was studied between various pyrroles and α-polyfluoroalkylated cyclic imines that were activated by Lewis acids. The reaction proceeded under mild conditions and provided a high yielding synthesis of α-CF3-substituted pyrrolidines and piperidines as well as seven-membered analogues that contained a pyrrole ring. The unpredictably high β-selectivity for the
研究了各种
吡咯和由
路易斯酸活化的 α-多氟烷基化环状
亚胺之间的 Friedel-Crafts 型烷基化反应。该反应在温和的条件下进行,并提供了 α-
CF3-取代的
吡咯烷和
哌啶以及含有
吡咯环的七元类似物的高产合成。由于热力学控制的亲电取代反应,观察到 1H-
吡咯和 N-取代的
吡咯的
氨基烷基化的不可预测的高β-选择性。计算数据与实验结果完全一致,这证实了观察到的区域选择性,这是由于含有 α-三
氟甲基取代
吡咯烷、
哌啶和氮杂
环庚烷环的 β 取代
吡咯的能量较低。