New chiral auxiliaries derived from β -pinene: Their use in the asymmetric reduction of β-keto-esters
摘要:
3-Ketobutyrates 6, derived from chiral auxiliary alcohols 5 - themselves efficiently prepared from beta-pinene 4 - were reduced with zinc borohydride, giving 3-hydroxybutyrates 7 with 2-70 % de, depending on the nature of aryl group in alcohols 5.
New chiral auxiliaries derived from β -pinene: Their use in the asymmetric reduction of β-keto-esters
摘要:
3-Ketobutyrates 6, derived from chiral auxiliary alcohols 5 - themselves efficiently prepared from beta-pinene 4 - were reduced with zinc borohydride, giving 3-hydroxybutyrates 7 with 2-70 % de, depending on the nature of aryl group in alcohols 5.
Asymmetric Friedel - Crafts Reaction: An Application to the Synthesis of an Etodolac Analogue
作者:L. M. Cabral、P. R. R. Costa、M. L. A. A. Vasconcellos、E. J. Barreiro、R. N. Castr
DOI:10.1080/00397919608003781
日期:1996.10
Abstract An Etodolac analogue, (-)-7, was prepared in 40% ee. by asymmetric Friedel-Crafts reaction, involving tryptophol 4 and chiral β-ketobutyrate 5f, followed by hydrolysis.
3-Ketobutyrates 6, derived from chiral auxiliary alcohols 5 - themselves efficiently prepared from beta-pinene 4 - were reduced with zinc borohydride, giving 3-hydroxybutyrates 7 with 2-70 % de, depending on the nature of aryl group in alcohols 5.