Novel Routes to Chiral 2-Alkoxy-5-/6- methoxycarbonylmethylidenepyrrolidines/-piperidines
摘要:
We report the results of a study aimed at the diastereoselective synthesis of chiral 2-alkoxy-5-/6-methoxy-carbonylmethylidenepyrrolidines/-piperidines by condensation of chiral amines onto omega-oxo alkynoates and omega-oxo beta-keto esters.
作者:Han-Young Kang、Yong Seo Cho、Hun Yeong Koh、Moon Ho Chang
DOI:10.1016/0040-4039(91)85084-i
日期:1991.6
It is demonstrated that the [3+2] cycloaddition of a nitrone to an alkyne is facile when the length of the tether connecting the two reacting sites is appropriate. The resulting [3+2] cycloaddition products, isoxazolidines can be further converted to 3-hydroxy-3-pyrrolin-2-ones and alpha-keto-beta, gamma-unsaturated esters by reductive and oxidative cleavage, respectively.