Enantioselective Synthesis of 2‐Substituted Indoles Bearing Trifluoromethyl Moiety by the Friedel‐Crafts Alkylation Reaction of 4,7‐Dihydroindole with
<i>N</i>
−H Trifluoromethyl Ketimines
作者:Tatsuhiro Uchikura、Riku Suzuki、Yusuke Suda、Takahiko Akiyama
DOI:10.1002/cctc.202000920
日期:2020.10.6
The Friedel‐Crafts alkylation reaction of 4,7‐dihydroindole with N‐unprotected trifluoromethyl ketimines by means of chiral phosphoric acid and the subsequent oxidation with DDQ afforded chiral 2‐indolylmethylamines bearing a trifluoromethyl moiety in good to high yields with excellent enantioselectivities under one‐pot conditions. The adduct was transformed without loss of enantioselectivity and the
通过手性磷酸将4,7-二氢吲哚与N-未保护的三氟甲基酮亚胺进行Friedel-Crafts烷基化反应,随后用DDQ氧化,可得到具有三氟甲基部分的手性2-吲哚基甲胺,具有良好的高收率,并且在一个条件下具有出色的对映选择性锅的条件。加合物被转化而不会损失对映选择性,并且通过X射线晶体学分析确定了绝对立体化学。