Fused Dihydropyrimidines by a Tandem Aza-Wittig-Heterocumulene-Mediated Annulation Reaction: Synthesis of 4,5-Dihydropyrazolo[3,4-d]pyrimidine Derivatives
Fused Dihydropyrimidines by a Tandem Aza-Wittig-Heterocumulene-Mediated Annulation Reaction: Synthesis of 4,5-Dihydropyrazolo[3,4-d]pyrimidine Derivatives