Dehydrogenative Aromatic Ring Fusion for Carbazole Synthesis via C–C/C–N Bond Formation and Alkyl Migration
作者:Saikat Maiti、Prasenjit Mal
DOI:10.1021/acs.orglett.7b01117
日期:2017.5.5
reported. Using the hypervalent iodine(III) reagent PhI(OAc)2 (PIDA), in a one-pot operation, up to five C(sp2)–H bonds, one N(sp3)–H bond functionalization, and one alkyl (Me, Et) group migration could all be achieved from non-prefunctionalized 1,3,5-trialkylbenzenes and anilides under ambient laboratory conditions. Mechanistically, it is shown that PIDA reacts with anilides to generate a nitrenium ion
据报道,咔唑通过顺序的C–C / C–N键形成和选择性的烷基迁移而合成了分子间脱氢环化(IDA)。使用一锅操作中的高价碘(III)试剂PhI(OAc)2(PIDA),最多可实现5个C(sp2)–H键,1个N(sp3)–H键功能化和1个烷基(Me ,Et)组迁移都可以在环境实验室条件下由未预官能化的1,3,5-三烷基苯和苯胺类化合物实现。从机理上讲,它表明PIDA与苯甲酸酯反应生成氮离子或同等的碳正离子,这会影响第二个芳环被活化以形成C-C / C-N键。从战略上讲,描述了芳烃与苯胺的区域选择性融合。