Aromaticity in azlactone anions and its significance for the Erlenmeyer synthesis
作者:Sosale Chandrasekhar、Phaneendrasai Karri
DOI:10.1016/j.tetlet.2006.06.006
日期:2006.8
Azlactone anions—the key intermediates in the classical Erlenmeyersynthesis of amino acids—apparently possess aromatic stabilization, as indicated by the relative rate of base catalyzed deuterium exchange in the following analogs: 1-methyl-2-phenyl-5(4H)-imidazolone > 2-phenyl-5(4H)-oxazolone (azlactone) > 3,3-dimethyl-2-phenyl-4(3H)-pyrrolone. This is paralleled by the relative rate of condensation