S. Obika et al., SYNTHESIS AND CONFORMATION OF 3'-O,4'-C-METHYLENERIBONUCLEOSIDES, NOVEL BICYCLIC NUCLEOSIDE ANALOGS FOR 2',5'-LINKED OLIGONUCLEOTIDE MODIFICATION, Chemical communications, (17), 1997, pp. 1643-1644
Novel bicyclic nucleoside analogues 3'-O,4'-C-methylene-ribonucleoside
s 1 are conveniently prepared starting from uridine; the sugar puckeri
ng of 1 is found to be nearly in the S-conformation by means of PM3 ca
lculations and H-1 NMR studies.