Regioselective synthesis of O2- and O6-cyclopyrimidine nucleoside analogues
摘要:
Regioselective synthesis of two new series of cyclonucleoside analogues from the 1,2-carbonucleoside of uracil 1a: O-2 7 '-cyclo-nucleosides (3a-c) and O-6 7 '-cyclonucleosides (4a-c), analogues of pyrimidine (cyclohexane derivatives) is reported. Synthesis Of O-2-cyclo- nucleoside analogues was performed by activation of the hydroxymethyl group of carbocyclic moiety and using the carbonyl group at position 2 of the heterocyclic base as a nucleophile. Synthesis of O-6-cyclonucleoside analogues was achieved by nucleophilic attack of the 7 '-hydroxyl group on the electron-deficient 6-position and subsequently dehydrohalogenation in basic conditions. (c) 2006 Elsevier Ltd. All rights reserved.