Alkyl-C versus phenyl-C reactivity in unsymmetrical cyclopropenones. Reaction of methylphenylcyclopropenone with pyrazoles.
作者:Albert Kascheres、Jair Correa Filho、Sílvio Cunha
DOI:10.1016/s0040-4020(01)80307-0
日期:1993.1
Methylphenylcyclopropenone () reacts with pyrazole and 3,5-dimethylpyrazole to afford ketones () resulting from initial nucleophilic attack at methyl-C, in agreement with an AM1 calculation performed on . Intermediacy of dipolar species accounts for products and allows incorporation of other nucleophiles (2-aminothiazoole, 2-amino-4-methylpyridine, and o-phenylenediamine).