A stereoselective synthesis of the (2R, 3S)- and (2S, 3R)-3-amino-2-hydroxybutyric acid derivatives, the key components of a renin inhibitor and bestatin.
作者:Yuko Kobayashi、Yoshiji Takemoto、Tetsuhide Kamijo、Hiromu Harada、Yoshio Ito、Shiro Terashima
DOI:10.1016/s0040-4020(01)88510-0
日期:1992.1
The title synthesis was achieved by featuring the [2+2]-cycloaddition reaction of benzyloxyketene with a chiral imine derived from methyl (R)- or (S)-mandelate, alcoholysis of the formed 3,4-cis disubstituted β-lactam under acidic conditions, and reductive removal obtained by the [2+2]-cycloaddition reaction employing achiral and chiral imines derived from benzylamine, p-anisidine, di-panisylmethylamine
通过特征在于苄氧乙烯酮与衍生自(R)-或(S)-扁桃酸甲酯的手性亚胺的[2 + 2]-环加成反应,在以下条件下醇解所形成的3,4-顺式双取代β-内酰胺,从而实现标题合成。还报道了在酸性条件下,以及使用衍生自苄胺,对苯胺,二潘尼基甲胺和(S)-1-苯基乙胺的非手性和手性亚胺通过[2 + 2]-环加成反应获得的还原性去除。[2 + 2]-环加成反应的立体选择性可以通过两性离子中间体的初步形成及其随后的旋转性闭环来解释。