Enantioselective syntheses of (+)- and ()-nephrosteranic acid employing the Nicholas-Schreiber reaction
作者:Peter A. Jacobi、Prudencio Herradura
DOI:10.1139/cjc-79-11-1727
日期:——
(+)- and (-)-Nephrosteranic acid (16) have been prepared in an enantioselective fashion from alkyne acid 19 (or ent-19) by a three step sequence involving debenzylation-lactonization, oxidative cleavage, and selective epimerization at C-4. Acids 19 and ent-19 were obtained as single enantiomers employing a Nicholas-Schreiber reaction.