Total synthesis of antitumor agent at-125, (αS,5S)-α-amino-3-chloro-4,5-dihydro-5-isoxazoleacetic acid
作者:Jack E. Baldwin、Jin K. Cha、Lawrence I. Kruse
DOI:10.1016/s0040-4020(01)96774-2
日期:1985.1
A short and efficient total synthesis of racemic AT-125 and its racemic threo isomer proceeds via an intramolecular Michael cyclization of a protected α,β-dehydroglutamic acid γ-hydroxamate. Separation of diastereomers and deprotection to racemic AT-125 followed by enzymatic resolution of the N-chloroacetamide with hog-kidney acylase provides the natural αS,5S isomer.
外消旋AT-125及其外消旋苏式异构体的短而有效的全合成通过受保护的α,β-脱氢谷氨酸γ-异羟肟酸酯的分子内迈克尔环化进行。分离非对映异构体并将其脱保护为外消旋AT-125,然后用猪肾酰化酶酶促拆分N-氯乙酰胺,即可提供天然αS,5 S异构体。