Regioselective Friedel−Crafts Alkylation of Anilines and Amino-Substituted Heteroarenes with Hexafluoroacetone Sesquihydrate
作者:Raffaello Masciadri、Matthias Kamer、Nadine Nock
DOI:10.1002/ejoc.200300501
日期:2003.11
aminopyridines, underwent regioselective Friedel−Crafts alkylation in neat hexafluoroacetone sesquihydrate in a broad range of temperatures, reaction times, and yields (2%−94%) depending strongly on the electron density of the substrate. Prior N,N-dibenzylation of aniline and 2-aminopyridine strongly promoted substrate reactivity and resulted in higher yields (> 80%). The described Friedel−Crafts alkylations in
各种芳烃,包括苯胺、吡咯、吲哚、氨基恶唑、氨基噻唑、氨基喹啉和氨基吡啶,在纯六氟丙酮倍半水合物中在广泛的温度、反应时间和产率 (2%−94%) 中进行区域选择性 Friedel-Crafts 烷基化很大程度上取决于基板的电子密度。苯胺和 2-氨基吡啶的先前 N,N-二苄基化强烈促进底物反应性并导致更高的产率 (> 80%)。六氟丙酮倍半水合物中所描述的 Friedel-Crafts 烷基化发生在苯胺的对位或杂芳烃中 sp2 杂化氮原子的 β 位置。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)