The 1,3-dipolar cycloaddition reaction of unsymmetrically N-substituted and N-unsubstituted 1,3-oxazolium-5-olates with selected 3-substituted coumarins has been examined. Various types of pyrrole derivatives are isolated and their formation seems to be a function of the regio- and diastereochemistry of the initial cycloaddition step.
N-SUBSTITUTED AND N-UNSUBSTITUTED 1,3-OXAZOLIUM-5-OLATES CYCLOADDITION REACTIONS WITH 3-SUBSTITUTED COUMARINS
CORDARO, Massimiliano;GRASSI, Giovanni;RISITANO, Francesco;SCALA, ANGELA
2010-01-01
Abstract
The 1,3-dipolar cycloaddition reaction of unsymmetrically N-substituted and N-unsubstituted 1,3-oxazolium-5-olates with selected 3-substituted coumarins has been examined. Various types of pyrrole derivatives are isolated and their formation seems to be a function of the regio- and diastereochemistry of the initial cycloaddition step.File in questo prodotto:
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