Reactions of chiral (2S)-enolates of dioxolan-4-ones, derived from lactic, mandelic, and phenyllactic acids, with aliphatic (SS)- and (SR)-tert-butylsulfinyl aldimines afforded conformationally restrained C2-disubstituted N,O-orthogonally protected 3-amino-2-hydroxyalkanoates in the form of N-sulfinyl protected 1′-aminodioxolan-4-ones. The product distribution showed that there is significant kinetic
手性(2的反应小号)-enolates二
氧戊环-4-酮的,从
乳酸,
扁桃酸,和phenyllactic酸衍生的,与脂族(小号小号) -和(小号- [R )-叔丁基亚醛
亚胺,得到构象约束C2二取代Ñ,以N-亚磺酰基保护的1'-
氨基二
氧戊环-4-酮的形式,由O-正交保护的3-
氨基-2-羟基链烷酸酯。产物分布表明,由于(S)-或(R)-叔
丁基亚砜基
亚胺与(2 S)-
1,3-二氧戊环-4-酮的烯酸酯。选择性
甲醇盐诱导的N-亚磺酰基-1'-
氨基二
氧戊环酮的
缩醛基的去除产生相应的N-亚磺酰基保护的链烷酸甲酯。另外,选择性酸诱导的N-亚磺酰基-1'-
氨基二氧杂
环戊酮的亚磺酰基的去除提供了相应的N-未保护的1'-
氨基二氧杂
环戊酮,其碱诱导的环化作用提供了相应的β-内酰胺。