Convenient Synthesis of 2,7-Disubstituted 5<i>H</i>-1,3,4-Thiadiazolo[3,2-<i>a</i>]pyrimidin-5-ones and Related Compounds
作者:Tadakazu Tsuji、Keiko Takenaka
DOI:10.1246/bcsj.55.637
日期:1982.2
2,7-Disubstituted 5H-1,3,4-thiadiazolo[3,-2-a]pyrimidin-5-ones were synthesized from the reaction of 3-amino-6-methyl-2-thiouracil with carboxylic acid or from that of thiosemicarbazide with carboxylic acid and β-keto ester in the presence of phosphorus pentaoxide and methanesulfonic acid. The synthesis of related compounds is also described.