Reactions of 5-bromo-6-methoxy-5,6-dihydrouridine and its 2-thioanalogue with both of some guanidines and mercapto acrylicacid derivatives

5-bromo-6-methoxy-5,6-dihydrouridine and its 2-thioanalogue were allowed to react with some substituted guanidine tautomers and alpha- mercapto-beta-phenylacrylic acid. The products are 5,6-cyclized derivatives of both of uridine and 2-thiouridine