Synthesis of [1,2-a]-fused tricyclic dihydroquinolines by palladium-catalyzed intramolecular C–N cross-coupling of polarized heterocyclic enamines
作者:Břetislav Brož、Zdeňka Růžičková、Petr Šimůnek
DOI:10.3998/ark.5550190.p009.723
日期:——
A simple methodology for [1,2-a]-fused tricyclic dihydroquinolines is established. The key step of the methodology is an intramolecular Buchwald-Hartwig amination reaction of suitable halogenated (both bromo and chloro) cyclic enaminoketones, enaminoesters and enaminonitriles with various ring size (from fiveto seven-membered). Optimal reaction conditions (palladium source, base, ligand) depend on
建立了 [1,2-a]-稠合三环二氢喹啉的简单方法。该方法的关键步骤是合适的卤化(溴和氯)环状烯氨基酮、烯氨基酯和具有各种环大小(从五元到七元)的烯氨基腈的分子内 Buchwald-Hartwig 胺化反应。最佳反应条件(钯源、碱、配体)取决于起始烯胺的环大小,三环产物的产率为 65-98%。用高氯酸处理产物得到相应的高氯酸喹啉鎓。