Direct Catalytic Enantio- and Diastereoselective Mannich Reaction of Isocyanoacetates and Ketimines
作者:Irene Ortín、Darren J. Dixon
DOI:10.1002/anie.201309719
日期:2014.3.24
A catalytic asymmetric synthesis of imidazolines with a fully substituted β‐carbon atom by a Mannich‐type addition/cyclization reaction of isocyanoacetate pronucleophiles and N‐diphenylphosphinoyl ketimines has been developed. When a combination of a cinchona‐derived aminophosphine precatalyst and silver oxide was employed as a binary catalyst system, good reactivity, high diastereoselectivities (up
通过异氰基乙酸酯亲核试剂和N-二苯基膦酰基酮亚胺的曼尼希式加成/环化反应,已开发出具有完全取代的β-碳原子的咪唑啉催化不对称合成方法。当使用金鸡纳衍生的氨基膦预催化剂和氧化银的组合作为二元催化剂体系时,在一定范围内可获得良好的反应性,高非对映选择性(高达99:1 dr)和出色的对映选择性(高达99%ee)。的基板。