摘要:
Simplified, high yielding syntheses of suitably protected 2'-O-allylribonucleoside-3'-O-phosphoramidites starting from standard ribonucleosides have been elucidated. Specific 2'-O-allylation is readily achieved using amidine protection of the exocyclic amino groups of adenosine and cytidine and in the case of guanosine the allylation is carried out on an easily prepared intermediate bearing transient protection of the lactam function.