1,3-Dipolar cycloaddition of 2-azetidinone-tethered azomethine ylides. Application to the rapid, stereocontrolled synthesis of optically pure highly functionalised pyrrolizidine systems
1,3-Dipolar cycloaddition of 2-azetidinone-tethered azomethine ylides. Application to the rapid, stereocontrolled synthesis of optically pure highly functionalised pyrrolizidine systems
1,3-Dipolar cycloaddition of 2-azetidinone-tethered azomethine ylides. Application to the rapid, stereocontrolled synthesis of optically pure highly functionalised pyrrolizidine systems
作者:Benito Alcaide、Pedro Almendros、Jose M. Alonso、Moustafa F. Aly
DOI:10.1039/b000249f
日期:——
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.
Rapid and Stereocontrolled Synthesis of Racemic and Optically Pure Highly Functionalized Pyrrolizidine Systems via Rearrangement of 1,3-Dipolar Cycloadducts Derived from 2-Azetidinone-Tethered Azomethine Ylides
作者:Benito Alcaide、Pedro Almendros、Jose M. Alonso、Moustafa F. Aly
DOI:10.1021/jo005686s
日期:2001.2.1
a convenient procedure for the straightforward preparation of polyfunctionalized enantiopure pyrrolizidine systems. The methodology capitalizes on a HCl(g)-promoted reaction of the 1,3-dipolar cycloadducts derived from 2-azetidinone-tethered azomethine ylides, smoothly affording different types of highly functionalized bi- and tricyclic systems in racemic and optically pure forms. This process involves