Asymmetric Synthesis of α-Amino-β-hydroxy Acids Using a Chiral Pyridoxal-Like Pyridinophane–Zinc Complex as an Enzyme Mimic; Scope and Limitation
作者:Makoto Ando、Jun Watanabe、Hiroyoshi Kuzuhara
DOI:10.1246/bcsj.63.88
日期:1990.1
A chelate complex (4) with high homogeneity was precipitated upon stirring a mixture of zinc(II) ion and a Schiff base produced from glycine and (R)- or (S)-15-formyl-14-hydroxy-2,8-dithia[9](2,5)pyridinophane, chiral pyridoxal-like pyridinophane. A four-coordinated zinc chelate complex was newly proposed as the structure of 4. Aldol condensations between 4 and several aldehydes were attempted at pH
在搅拌锌(II)离子和由甘氨酸和(R)-或(S)-15-甲酰基-14-羟基-2,8-产生的席夫碱的混合物时,沉淀出具有高均匀性的螯合物(4) dithia[9](2,5)pyridinophane,手性吡哆醛样吡啶酚。新提出了一种四配位的锌螯合物作为 4 的结构。在 pH 10.0 下尝试了 4 和几种醛之间的羟醛缩合。在这些条件下,只有小的直链醛,如乙醛和丙醛,才能与 4 反应,得到相应的 α-氨基-β-羟基酸,对映体过量 27-77%。