This study presents the atroposelective alkylation of 2-arylindoles catalyzed by a substituted cinchonium salt as a phase-transfer catalyst. Under the optimized reaction conditions, various substrates are employed to yield products with high enantioselectivity. The presence of an ortho-nitro group at the aromatic ring is essential for high atroposelectivity, because it facilitates favorable interactions
本研究提出了由取代的
金鸡
铵盐作为相转移催化剂催化的 2-芳基
吲哚的对转选择性烷基化。在优化的反应条件下,采用多种底物,得到具有高对映选择性的产物。芳环上邻硝基的存在对于高对位选择性至关重要,因为它有利于催化剂和底物之间的良好相互作用。对映选择性的起源揭示了对映体有利的 π-π 相互作用和对不需要的对映体不利的空间张力。