Hydrolysis of 2'- and 3'-C-methyluridine 2',3'-cyclic monophosphates and interconversion and dephosphorylation of the resulting 2'- and 3'-monophosphates: comparison with the reactions of uridine monophosphates

2',3'-Cyclic monophosphates of 2'- and 3'-C-methyluridines have been prepared and shown to hydrolyze to a mixture of the correaponding 2'- and 3'-monophosphates. The predominant product isomer is the one having the tertiary hydroxyl group phosphorylated, but on longer treatment a phosphate migration from the tertiary to secondary hydroxyl function takes place. Hydrolytic dephosphorylation competes with the phosphate migration, the tertiary hydroxyl group being dephosphorylated 1 order of magnitude faster than the secondary one