Catalytic generation of cobalt enolates through ring-opening of easily accessible cyclopropanols, subsequent β-hydride elimination and site-selective reinsertion followed by diastereo- and enantioselective additions to aldimines is presented. Such a process represents an unprecedented reaction pathway of cobalt homoenolates, affording a wide range of β-amino-ketones in up to 95% yield, 90:10 dr and 99:1 er without the need of any stoichiometric amount of additive or reagent.
通过易得的
环丙醇环开,随后进行β-氢消除和位点选择性重新插入,最后对醛
亚胺进行非对映体选择性和对映体选择性加成,构建了
钴烯醇盐的催化生成。这一过程代表了一条前所未有的
钴同烯醇盐反应路径,能够在不需要任何
化学计量的添加剂或试剂的情况下,获得高达95%的产率、90:10的非对映体选择比和99:1的对映体选择比,生成多种β-
氨基酮。