6-Methylthiouracil and 6-Methyluracil Derivatives Synthesized by Reaction of Acetylketene With Thiourea and Urea Compounds in Presence of Yb(Tfa)3

Abstract

Thiouracil and uracil derivatives are among the bioactive molecules used in the treatment of many diseases, such as 6-propylthiouracil and 5-fluorouracil. A new synthesis method of 6-methylthiouracil and 6-methyluracil was developed in this study. Various 6-methylthiouracil and 6-methyluracil derivatives were obtained by reacting 2,2,6-trimethyl-4H-1,3-dioxin-4-one with thiourea and urea compounds in the presence of Yb(TFA)(3) according to this new method. Optimization of this new method was performed. The structures of 6-methylthiouracil and 6-methyluracil derivatives were characterized.