Trifluoroethanol solvent facilitates selective N-7 methylation of purines
作者:Honorine Lebraud、Celine Cano、Benoit Carbain、Ian R. Hardcastle、Ross W. Harrington、Roger J. Griffin、Bernard T. Golding
DOI:10.1039/c3ob27473j
日期:——
Purines protected at N-9 by p-methoxybenzyl are methylated or ethylated in 2,2,2-trifluoroethanol at N-7 by trimethyl- or triethyl-oxonium borofluorate, respectively. Subjecting the resulting cationic species to microwave irradiation releases an N7-methyl- or ethyl-purine. This one-pot procedure is an efficient regiospecific method applicable to diverse substrates.