Studies on Chemical Synthesis of mRNAs. I. Synthesis and Properties of<i>N</i><sup>2</sup>-Tritylguanosine Derivatives and Application to Synthesis of pGpUpU
group of 2′,3′,5′-tri-O-acetylguanosine by treatment with the corresponding trityl chlorides in pyridine to afford the N2-tritylated guanosinederivatives in high yields. Similarly, the N6-tritylated adenosine derivatives were synthesized. The stability of the three kinds of trityl groups under acidic conditions were described. The MMTr and Tr groups were found to be suitable for the protection of the 2-amino