Enantiomerically enriched preparation of enolizable β-keto amides. Diastereoselective α-acylation and subsequent aminolysis of 2-acyl-3-phenyl-l-menthopyrazoles

Article abstract of DOI:10.1016/0040-4020(96)00550-9

After deprotonation with LDA, 2-acyl-3-phenyl-l-menthopyrazoles (13) were diastereomerically α-acylated to give N-(3-phenyl-l-menthopyrazolyl) β-keto amides (14-19). The subsequent amides were converted into the corresponding N-alkyl amides (21-24) retain