A series of 3-acylidene-4-methylazetidin-2-one derivatives bearing various substituents at the 1-position of the azetidin-2-one ring was synthesized. These compounds were evaluated for plateletaggregationinhibitory activities. Most of the compounds synthesized showed potent inhibitory activities against rabbit plateletaggregation induced by adenosine diphosphate or collagen in vitro. Structure-activity
Mechanistic Insight into the Spirocyclopropane Isoxazolidine Ring Contraction
作者:Stefan Diethelm、Franziska Schoenebeck、Erick M. Carreira
DOI:10.1021/ol403693t
日期:2014.2.7
A mechanistic study of the ringcontraction of spirocyclopropane isoxazolidines to form β-lactams is reported. Based on experimental and computational investigations, we propose a concerted mechanism that proceeds with retention of configuration during cyclopropane cleavage.
Stereochemical effects in the reactions of n-alkyl-4-substituted azetidine 2-carboxylic acids with oxalyl chloride. Rearrangement to chloro-γ-lactams.
作者:Harry H. Wasserman、William T. Han、John M. Schaus、John W. Faller
DOI:10.1016/0040-4039(84)80021-0
日期:——
Treatment of N-alkylazetidine 2-carboxylates with oxalyl chloride may yield acid chlorides, iminium salts or chloro-γ-lactams depending on the stereochemistry and nature of the substituents on the azetidine ring.