title: Regioselectivity in the multicomponent reaction of 5-aminopyrazoles, cyclic 1,3-diketones and dimethylformamide dimethylacetal under controlled microwave heating.
abstract: The multicomponent reaction of 5-aminopyrazole derivatives with cyclic 1,3-dicarbonyl compounds and dimethylformamide dimethylacetal (DMFDMA) in DMF at 150 °C under controlled microwave heating afforded regioselectively 8,9-dihydropyrazolo[1,5-a]quinazolin-6(7H)-ones 6 rather than the corresponding dihydropyrazolo[5,1-b]quinazolin-8(5H)-ones 4.
authors.affiliation: Chemistry Department, Faculty of Science, El-Minia University, El-Minia 61519, Egypt.
authors.forename: Kamal Usef
authors.initials: KU
authors.lastname: Sadek
authors.forename: Ramadan Ahmed
authors.initials: RA
authors.lastname: Mekheimer
authors.forename: Tahany Mahmoud
authors.initials: TM
authors.lastname: Mohamed
authors.forename: Moustafa Sherief
authors.initials: MS
authors.lastname: Moustafa
authors.forename: Mohamed Hilmy
authors.initials: MH
authors.lastname: Elnagdi