Cobalt-Catalyzed Arylative Cyclization of Acetylenic Esters and Ketones with Arylzinc Reagents through 1,4-Cobalt Migration
作者:Jianming Yan、Naohiko Yoshikai
DOI:10.1021/acscatal.6b01039
日期:2016.6.3
reported a cobalt-catalyzed migratory arylzincation reaction of an alkyne that features alkenyl-to-aryl 1,4-cobalt migration and cobalt-to-zinc transmetalation as key steps. We report herein that the cobalt/arylzinc combination can also promote a cascade arylative cyclization reaction of alkynes bearing pendant ester or ketone moieties to afford benzo-fused cyclic ketone or alcohol products, respectively
1,4-迁移的有机钯和有机or物种已被用于发展涉及远程C–H键活化的各种级联反应。最近,我们报道了以炔基到芳基1,4-钴迁移和钴到锌的过渡金属化为关键步骤的炔烃的钴催化迁移性芳基锌化反应。我们在本文中报道,钴/芳基锌的组合还可以促进带有侧链酯或酮部分的炔烃的级联芳基环化反应,以分别提供苯并稠合的环酮或醇产物。该反应被认为是通过将炔烃插入芳基钴物种,1,4-钴迁移以及向羰基的分子内有机钴加成而进行的。