Copper-Catalyzed Conjugate Additions of Alkylboranes to Imidazolyl α,β-Unsaturated Ketones: Formal Reductive Conjugate Addition of Terminal Alkenes
作者:Hirohisa Ohmiya、Mika Yoshida、Masaya Sawamura
DOI:10.1021/ol102819k
日期:2011.2.4
Conjugate addition of alkylboron compounds (alkyl-9-BBN) to imidazol-2-yl α,β-unsaturated ketones proceeded in the presence of a catalytic amount (10 mol %) of CuCl, 1,3-bis(2,4,6-trimethylphenyl)imidazol-2-ylidene (IMes), and t-BuOK. The alkylboranes are available through alkene hydroboration, and thus the overall process represents a reductive conjugate addition of alkenes to enone derivatives. A
在催化量(10 mol%)的CuCl,1,3-双(2,4, 6-三甲基苯基)咪唑-2-亚烷基(IMes)和t- BuOK。烷基硼烷可通过烯烃加氢硼化获得,因此整个过程代表了烯烃与烯酮衍生物的还原共轭加成。在烯烃和α,β-不饱和酮中都可以容忍多种官能团。2-酰基咪唑部分可以容易地转化为相应的羧酸,酯和酰胺衍生物。