1,3-Dipolar cycloaddition of 2-azetidinone-tethered azomethine ylides. Application to the rapid, stereocontrolled synthesis of optically pure highly functionalised pyrrolizidine systems
Abstract
A new straightforward methodology to prepare polyfunctionalised enantiopure pyrrolizidine systems, based on the 1,3-dipolar cycloaddition of 2-azetidinone-tethered azomethine ylides as the key reaction, is presented.