Acid-catalyzed reactions of aromatic aldehydes with ethyl diazoacetate

ORGN 590

Matthew E. Dudley, M. Mahmun. Hossain, Courtney L. Brennan, Syed J. Mahmood, Shahidul Islam, Syarhabil Ahmad, Monzur Morshed, Mary Rose Atuu, and Bryan Branstetter. University of Wisconsin-Milwaukee, 3210 N. Cramer Street, Milwaukee, WI 53211
We have found that several commercial Lewis acids, including those of the Brønsted series, are able to catalyze the reaction between aromatic aldehydes and ethyl diazoacetate (EDA) to produce β-hydroxy acrylates and β-keto esters. We have since discovered that reactions catalyzed by the iron Lewis acid [(h5-C5H5)Fe+(CO)2(THF)]BF4- or HBF4∙OEt2 have the best yields and greatest ratio of β-hydroxy acrylate.