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.
Synthesis of the enantiomers of 5-hexadecanolide, the pheromone of the queen of the oriental hornet, vespa orientalis,employing enzymic resolution of (±)-2-aminotridecanoic acid as the key-step
作者:Kenji Mori、Tatsuya Otsuka
DOI:10.1016/s0040-4020(01)96498-1
日期:1985.1
Optical resolution of(±)-2-chloroacetylaminotridecanoic acid with amino acylase gave (S)-2-aminotridecanoic add, which was converted into highly optically pure (S)-5-hexadecanolide (the pheromone of Vespa orientalls). Similarly (R)-2-chloroacetylammotridecanoic acid recovered after the enzymic hydrolysis yielded (R)-5-hexadecanolide. The existing methods for the preparation of the enantiomers of 5-hexadecanolide