The diastereoselectivenucleophilicaddition of alkyllithium to N-alkylidene-alpha-naphthylethylamine was carried out. In the presence of Lewis acids or Lewis bases, organolithiums reacted smoothly with imines to give the corresponding amines in high stereoselectivity (up to 100% de). Furthermore, the resulting opticallyactive amines were found to be useful for asymmetric reactions as chiral ligands
1(2,6-dichlorophenyl)ethylamine: a new and efficient chiral auxiliary for the Staudinger β-lactam synthesis
作者:Yukihiko Hashimoto、Akiyoshi Kai、Kazuhiko Saigo
DOI:10.1016/0040-4039(95)01883-j
日期:1995.11
The diastereoseleCtive synthesis of β-lactams by the Staudinger reaction was examincd using chiral imines, derived from substituted 1-phenylethylamines. Among them, 1-(2,6-dichlorophenyl)ethylamine was found to be a new and efficient chiral auxiliary, and the corresponding cis-β-lactams were obtained in good to excellent yields with high diastereoselectivity.