Synthesis of Carbocyclic Pyrimidine Nucleosides Using the Mitsunobu Reaction - Part I: Influence of the Alcohol on N1- versus O<sup>2</sup>-Alkylation
作者:Chris Meier、Olaf R. Ludek
DOI:10.1055/s-2005-922746
日期:——
The influence of the solvent on N- vs O-alkylation of N3-benzoylthymine under Mitsunobu conditions is described. The Mitsunobu reaction is an important tool in carbocyclicnucleoside chemistry for the direct coupling of alcohols with heterocyclic bases under mild conditions.
1-substituted uracil and thyminederivatives have been developed. The aminolysis of 2- or 4-nitrophenyl 3-ethoxyacryloylcarbamate and 3-ethoxy-2-methylacryloylcarbamate with a variety of primary amino derivatives proceeded smoothly under very mild reaction conditions yielding almost quantitatively the 1,3-disubstituted urea derivatives. Their subsequent cyclization provided the 1-substituted uracil and thymine