Synthesis of Polysubstituted Pyrimidines from Ketene Dithioacetals Using KF/Al<sub>2</sub>O<sub>3</sub>Catalyst
作者:Shen-Yi Yu、Ya-Xian Cai
DOI:10.1081/scc-120026325
日期:2003.12
Abstract KF/Al2O3 was first used to catalyze the synthesis of 2-alkylthio-4- amino-5-cyano-6-methylthiopyrimidines 3a–f via the reaction of the ketenedithioacetals 1 (prepared from malononitrile) with isothiuronium salts 2a–f. Six pyrimidine compounds were prepared and all of their structures were confirmed by elemental analysis, 1H NMR, and IR. The reaction conditions (solvents, catalyst amounts