Intramolecular cycloaddition of azomethine ylides, from imines of O-acylsalicylic aldehyde and ethyl diazoacetate, to ester carbonyl--experimental and DFT computational study

Org Biomol Chem. 2012 Aug 7;10(29):5582-91. doi: 10.1039/c2ob25676b. Epub 2012 Jun 21.

Abstract

Intramolecular 1,3-dipolar cycloaddition of alkoxycarbonyl-substituted azomethine ylides to ester carbonyl was realized for the first time in the reaction of imines of O-acylsalicylic aldehyde with ethyl diazoacetate in the presence of Cu(tfacac)(2). The stereoselectivity of the cycloaddition is explained using DFT calculations.