Selective 2′-<i>O</i>-Methylation of Pyrimidine-Ribonucleosides by Trimethylsulfonium Hydroxide in the Presence of Mg<sup>2+</sup>and Ca<sup>2+</sup>Ions
Reactions of various ribonucleosides with trimethylsulfoniumhydroxide were investigated in the presence of Mg2+ and Ca2+ ions. The 2′-OH groups of pyrimidine-ribonucleosides were methylated selectively.