Access to unsaturated chiral epoxides. Part II. Synthesis of a component of the sex pheromone of Phragmatobia fuliginosa
作者:J Soulié、T Boyer、J.Y Lallemand
DOI:10.1016/0957-4166(95)00046-r
日期:1995.2
A generalmethod for the synthesis of chiral cis-epoxides substituted bearing a saturated chain and an unsaturated chain is described. This method is used to synthesize both enantiomers of compound 1.
A concise access to alpha,beta-dihydroxy alpha-amino acid-derived N-carboxyanhydrides (NCAs) with either like or unlike relative configuration is described. The key steps of the synthetic route are the preparation of the nonracemic 4-alkenyl beta-lactams, through either Horner-type olefination of a common 4-formyl beta-lactam or the Corey-Winter alkene synthesis applied to 4-dihydroxyalkyl beta-lactams