A New Neighbouring-Group Reaction to Form Pyridopyrrolobenzoxazinediones
作者:Gerhard Hamprecht、Norbert Zimmermann、Thomas D. Weiß
DOI:10.1002/ejoc.200400307
日期:2004.8
The azaphthalimide 2a is the first phthalimide oxygen found to undergo a neighboring-group participation reaction with a vicinal N-phenyl carboxylic acid chloride upon nucleophilic addition with alcohols. Owing to the free rotation of the N-phenyl moiety, hetero-anellated benzoxazinedione isomers 3 and 4 are accessible, whereby 3 is preferred to 4 as the pyridine nitrogen in 2a preferentially activates