Under relatively strong Lewis acidic conditions (a softer counter ion) using TMSOTf and TMSI, the aminomethylation of indole or pyrrole with a typical N,O-acetal preferentially produced the kinetically favored N-aminomethylated indole or pyrrole derivative. Use of a relatively weak Lewis acid (a harder counter ion), such as TMSCl and TMSBr, preferentially produced the thermodynamically favored C-aminomethylated indole and pyrrole derivative.
在使用 TMSOTf 和 TMSI 的相对较强的
路易斯酸条件下(较软的反离子),
吲哚或
吡咯与典型的 N,O-
缩醛的
氨基甲基化反应优先产生动力学上有利的 N-
氨基甲基化
吲哚或
吡咯衍
生物。使用相对较弱的
路易斯酸(较硬的反离子),如 TMSCl 和 TMSBr,优先产生热力学上有利的 C-
氨基甲基化
吲哚和
吡咯衍
生物。