REGIO- AND STEREOSELECTIVE 1,3-DIPOLAR CYCLOADDITION REACTIONS BETWEEN ARYLIDENEACETONES AND STABILIZED AZOMETHINE YLIDES OBTAINED FROM NINHYDRIN AND INDENOQUINOXALINONES
DOI:
https://doi.org/10.1007/4148Keywords:
arylideneacetones, spiropyrrolidines, spiropyrrolizidines, stabilized azomethine ylides, 1, 3-dipolar cycloaddition.Abstract
Stabilized azomethine ylides, generated in situ from proline/sarcosine and ninhydrin or indenoquinoxalinones, underwent 1,3-dipolarcycloaddition at the activated double bond of arylideneacetones, leading predominantly to endo-spiro adducts. These products formed as
a result of addition between the less substituted carbon atom of azomethine ylide and the most electrophilic site of the dipolarophile.