Efficient and β-Stereoselective Synthesis of Pyrazole C-Nucleosides

Abstract

3(5)-(β-d-Ribofuranosyl)pyrazole 1 and 3(5)-(2-deoxy-β-d-ribofuranosyl)pyrazole (2) were stereoselectively synthesized by cyclization of 1,2-diazafulvene intermediates obtained from 2,3,5-tri-O-benzyl-d-ribose (5) and 3,5-di-O-benzyl-2-deoxy-d-ribose (10), respectively.

Key words

pyrazole - C-nucleoside - β-anomer - stereoselective synthesis - diazafulvene

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