Abstract
Several chiral phosphoric acids were evaluated as organocatalysts for the enantioselective Biginelli reaction of aliphatic aldehydes. With a chiral phosphoric acid derived from 3,3′-bis(3,5-di-tert-butyl-4-methoxyphenyl)-1,1′-binaphthalene-2,2′-diol, and after extensive optimization of the reaction conditions, the corresponding dihydropyrimidines were obtained in moderate to high yields with 73–87% ee by a three-component reaction of an aliphatic aldehyde, urea, and a β-keto ester.
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