One-pot Preparation of 2,6-Disubstituted 4-(Trifluoromethyl)pyrimidines <i>via</i> the Tandem Cyclization, Dehydration, and Oxidation Reaction of α,β-Unsaturated Trifluoromethyl Ketones Using POCl<sub>3</sub>-Pyridine-Silica Gel and MnO<sub>2</sub> Systems
作者:Kazumasa Funabiki、Hiroko Nakamura、Masaki Matsui、Katsuyoshi Shibata
DOI:10.1055/s-1999-2741
日期:1999.6
The treatment of α,β-unsaturated trifluoromethyl ketones with amidines in acetonitrile gave the corresponding 4-hydroxy-4-(trifluoromethyl)-3,5,6-trihydropyrimidines, followed by successive dehydration with phosphorus oxychloride-pyridine-silica gel and oxidation with manganese(IV) oxide, producing 2,6-disubstituted 4-(trifluoromethyl)pyrimidines in good to excellent yields.
在乙腈中,以酰胺处理α,β-不饱和三氟甲基酮,得到了相应的4-羟基-4-(三氟甲基)-3,5,6-三氢嘧啶,随后通过磷酰氯-吡啶-硅胶依次脱水,再以二氧化锰氧化,在优良至极佳的产率下生成2,6-二取代4-(三氟甲基)嘧啶。