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.
(+)和(-)-肾甾烷酸(16)已经通过一个三步反应序列以高对映选择性的方式从炔酸19(或ent-19)制备而成,该序列包括脱苄基化-内酯化、氧化裂解和C-4位的选择性异构化。酸19和ent-19通过Nicholas-Schreiber反应作为单一的对映异构体获得。