Convenient procedure for the stereospecific synthesis of optically active alkyl S-alkyl methylphosphonothioates, dialkyl S-alkyl phosphorothioates, dialkyl methylphosphonates, and trialkyl phosphates
作者:David B. Cooper、C. Richard Hall、Thomas D. Inch
DOI:10.1039/c39750000721
日期:——
Starting from the opticallyactive cyclic esters prepared from ephedrine and RPSCl2(R = Cl or Me), opticallyactive alkyl S-methyl methylphosphonothioates and dialkyl S-methyl phosphorothioates are isolated in yields of 32–60%, by a sequence which permits the assignment of absolute configuration to the products; bromine promoted methanolysis of the S–Me derivatives affords the corresponding O-methyl