Yoshimura Y, Sano T, Matsuda A, Ueda T
Nucleic Acids Symp Ser. 1986(17):53-5.
The nucleophilic attack of lithiated pyrimidines to a suitably-protected 3-ketosugar, afforded the 3-branched sugar stereospecifically, followed by intramolecular glycosylation to give 6,3'-methano-cyclo-pyrimidine nucleosides. The 2'-deoxygenation was achieved by sequential protection, deprotection and radical reduction.