A Green Approach to Synthesize Dihydropyrimidinone Derivatives by Using Anhydrous ZnCl2 Catalyst Under Refluxing Condition in Heptane-Toluene Medium via Biginelli Reaction
作者:Kawsari Akhter、Khorshada Jahan、U.K.R. Romman、M. Giasuddin Ahmed、Md. Sharifur Rahman、Md. Al-Amin
DOI:10.14233/ajchem.2015.18615
日期:——
Aldehydes, 1a-g (1a, Ar = 4-Cl-C6H4, 1b, Ar = 4-CH3-C6H4, 1c, Ar = 2-Cl-C6H4, 1d, Ar = 2-CH3- C6H4, 1e, Ar = -C6H5, Ar = 4-Cl-C6H4, 1g, Ar = 2-Cl-C6H4) reacted with acetylacetone 2a and urea/thiourea 3a-b in the presence of anhydrous zinc chloride under refluxing condition in heptane-toluene medium to give the corresponding 5-aceto-4-aryl-6-methyl-2-oxo-1,2,3,4-tetrahydropyridimidine 4a-d and 5-aceto-4-aryl-6-methyl-2-thio-1,2,3,4-tetrahydropyridimidine 4e-g. The structure of the compounds 4a-g were confirmed by their UV, IR, 1H NMR and 13C NMR analysis.
醛 1a-g (1a, Ar = 4-Cl-C6H4, 1b, Ar = 4-CH3-C6H4, 1c, Ar = 2-Cl-C6H4, 1d, Ar = 2-CH3- C6H4, 1e, Ar = -C6H5, Ar = 4-Cl-C6H4, 1g、Ar=2-Cl-C6H4)与乙酰丙酮 2a 和脲/硫脲 3a-b 在无水氯化锌存在下于庚烷-甲苯介质中回流反应,得到相应的 5-乙酰基-4-芳基-6-甲基-2-氧代-1,2,3,4-四氢吡啶脒 4a-d 和 5-乙酰基-4-芳基-6-甲基-2-硫代-1,2,3,4-四氢吡啶脒 4e-g。化合物 4a-g 的结构通过紫外、红外、1H NMR 和 13C NMR 分析得到了证实。