A Facile Cu(I)/TF-BiphamPhos-Catalyzed Asymmetric Approach to Unnatural α-Amino Acid Derivatives Containing <i>gem</i>-Bisphosphonates
作者:Zhi-Yong Xue、Qing-Hua Li、Hai-Yan Tao、Chun-Jiang Wang
DOI:10.1021/ja2043563
日期:2011.8.3
A novel catalyticasymmetricMichaeladdition of azomethine ylide with β-substituted alkylidene bisphosphates was realized in the presence of a chiral copper(I)/TF-BiphamPhos complex. The present system provides a unique and facile access to enantioenriched unnatural α-amino acid derivatives containing gem-bisphosphonates (gem-BPs) in high yields with excellent diastereoselectivities and enantioselectivities
在手性铜 (I)/TF-BiphamPhos 配合物存在下,实现了一种新型催化不对称迈克尔加成与 β-取代的亚烷基双磷酸盐的偶氮甲碱叶立德。本系统提供了一种独特且简便的途径,可以高产率地获得富含对映体的非天然 α-氨基酸衍生物,其中含有 gem-双膦酸盐 (gem-BPs),具有出色的非对映选择性和对映选择性。随后的转化可以方便地制备含有 BP 和双膦酸的生物活性非天然 α-氨基酸衍生物,而不会损失非对映体和对映体过量。
Dioxirane Oxidation of 2-Aryl-1-vinyl-1, 1-diphosphane Dioxide: A Convenient Approach for the Synthesis of Novel 1,2-Epoxy-2-aryl Ethyl<i>gem</i>bisphosphonates