Chiral Tricyclic Iminolactone Derived from (1<i>R</i>)-(+)-Camphor as a Glycine Equivalent for the Asymmetric Synthesis of α-Amino Acids
作者:Peng-Fei Xu、Yuan-Shek Chen、Shu-I Lin、Ta-Jung Lu
DOI:10.1021/jo011139a
日期:2002.4.1
development of a highly efficient and stereoselective methodology for the preparation of alpha-amino acids is described. The chiral template, tricyclic iminolactone 7, was synthesized from (1R)-(+)-camphor in five steps in 50% overall yield. Alkylation of iminolactone 7 afforded the alpha-monosubstituted products in good yields (74-96%) and excellent diastereoselectivities (>98%). Hydrolysis of the
描述了用于制备α-氨基酸的高效和立体选择性方法的发展。由(1R)-(+)-樟脑分五个步骤合成手性模板三环亚氨基内酯7,总收率为50%。亚氨基内酯7的烷基化提供了高收率(74-96%)和出色的非对映选择性(> 98%)的α-单取代产物。烷基化的亚氨基内酯的水解以良好的收率和对映选择性提供了所需的α-氨基酸,并且几乎定量回收了手性助剂4。