Cyanomethylene triphenylphosphoranes of N-protected amino acids were synthesized from the corresponding N-urethane protected α-amino acid N-carboxyanhydrides (UNCAs) by reaction with cyanomethyltriphenylphosphonium chloride in good yields. These compounds are precursors of α-keto esters which are candidates for mimicking the tetrahedric transition state in enzyme inhibitors.
Synthesis of the Cyclic Peptidic Protease Inhibitor Eurystatin A Using Acyl Cyano Phosphorane Methodology
作者:Harry H. Wasserman、Anders K. Petersen
DOI:10.1021/jo9718253
日期:1997.12.1
Application of acyl cyanophosphorane methodology to the synthesis of protease inhibitors: poststatin, eurystatin, phebestin, probestin and bestatin
作者:Harry H Wasserman、Anders K Petersen、Mingde Xia
DOI:10.1016/s0040-4020(03)00860-3
日期:2003.8
Full details are given for the syntheses of the proteaseinhibitors, poststatin and eurystatin by the acyl cyanophosphorane coupling procedure used for the formation of α-keto amides. We have also extended this methodology to the syntheses of the related α-hydroxy amide natural products, phebestin, probestin and bestatin. The key step in the latter synthetic sequences involved diastereomeric selectivity