Highly β-Regioselective Friedel-Crafts Aminoalkylation of Pyrroles with Cyclic Perfluoroalkylated Imines
作者:Olga I. Shmatova、Nikolay E. Shevchenko、Elisabeth S. Balenkova、Gerd-Volker Röschenthaler、Valentine G. Nenajdenko
DOI:10.1002/ejoc.201201725
日期:2013.5
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。