Rapid C–H Transformation: Addition of Diarylmethanes to Imines in Seconds by Catalytic Use of Base
作者:Christian Weindl、Sebastian L. Helmbrecht、Lukas Hintermann
DOI:10.1021/acs.joc.2c02658
日期:——
The addition of diarylmethanes or methylarenes via activation of benzylic C(sp3)–H bonds to N-aryl imines proceeds under catalysis by alkali hexamethyldisilazide (HMDS) base to give N-(1,2,2-triarylethyl)anilines or N-(1,2-diarylethyl)anilines, respectively. In the presence of 10 mol % of LiHMDS at room temperature, the diarylmethane addition equilibrates within 20–30 s and is driven to near completion
二芳基甲烷或甲基芳烃通过活化苄基 C(sp 3 )–H 键与N -芳基亚胺的加成反应在碱金属六甲基二硅氮化物 (HMDS) 碱的催化下生成N -(1,2,2-三芳基乙基)苯胺或N - (1,2-二芳基乙基)苯胺,分别。在室温下存在 10 mol% LiHMDS 的情况下,二芳基甲烷加成在 20-30 秒内达到平衡,并通过将反应混合物冷却至 -25 °C 使其接近完成,提供 N -(1,2,2-三芳基乙基) 苯胺产率 >90%。