Highly chemo- and regioselective phosphitylation of unprotected 2′-deoxyribonucleosides
作者:Yukiko Kato、Natsuhisa Oka、Takeshi Wada
DOI:10.1016/j.tetlet.2006.02.060
日期:2006.4
regioselective phosphitylation of unprotected2′-deoxyribonucleosides by the use of di-tert-butyl N,N-diethylphosphoramidite, a sterically hindered phosphoramidite. Both N/O- and primary hydroxy group-selectivities were simultaneously achieved, and the selectivity for the 5′-hydroxy groups was up to 97% regardless of the base moiety of the 2′-deoxyribonucleosides. The 3′-O-isomers and the 5′-O-isomers were easily