Microwave assisted solid phase catalyst-free Biginelli synthesis of 3,4-dihydropyrimidin-2(1<i>H</i>)-one and 3,4-dihydropyrimidin-2(1<i>H</i>)-thione: A green approach, characterization and molecular crystal structures
作者:Minaxi S. Maru
DOI:10.1080/15421406.2016.1235928
日期:2016.12.11
phase catalyst-free Biginelli synthesis of novel 5-carbethoxy-4-(3-bromo-4-hydroxy-5-methoxyphenyl)-6-methyl-3,4-dihydropyrimidin-2(1H)-one (C15H17BrN2O5) and 5-carbethoxy-4-(3-bromo-4-hydroxy-5-methoxyphenyl)-6-methyl-3,4-dihydropyrimidin-2(1H)-thione (C15H17BrN2O4S) has been carried out under microwave irradiation at 400W. The structures of both compounds were confirmed by 1H NMR, 13C NMR, Mass, FT-IR
Nickel Chloride Hexahydrate Catalyzed Multicomponent Biginelli's Synthesis of 3,4-Dihydropyrimidin-2(1<i>H</i>)-Ones and Thiones
作者:Şirin Gülten
DOI:10.1002/jhet.2700
日期:2017.3
An efficient protocol is reported for the one‐pot three‐component Bignelli synthesis of a series of 3,4‐dihydropyrimidine‐2(1H)‐ones and thiones in good yields (66–90%) from the aldehydes (4‐benzyloxybenzaldehyde, 5‐bromovanilin, 4‐formyl‐1‐cyclohexene, and trans‐cinnamaldehyde), β‐keto esters (ethyl acetoacetate, allyl acetoacetate, and t‐butyl acetoacetate), and urea/thiourea in ethanol, using nickel