A method for the preparation of orotic acid and thioorotic acid is described which includes the formation of carboxymethylene-hydantoin or -thiohydantoin and subsequent rearrangement and isolation of orotic acid and thioorotic acid, respectively.
Efficient Synthesis of Tetraacetylglycoluril in the Presence of Phosphorus-Containing Catalysts
作者:A. A. Bakibaev、S. Yu. Panshina、N. F. Hoang、D. A. Kurgachev、A. E. Ukhov、V. S. Malkov、K. B. Zhumanov
DOI:10.1134/s1070428021010085
日期:2021.1
Abstract The effect of phosphorus-containing catalysts, namely phosphorousacid, phosphoricacid, diethyl hydrogen phosphite, and 1-hydroxyethane-1,1-diyldiphosphonic acid (HEDP), in the synthesis of tetraacetylglycoluril by acylation of glycoluril with acetic anhydride at 140°C has been studied. The use of 4 equiv of phosphorous or phosphoricacid with respect to glycoluril has been found to be the most