Synthetic Studies of 5, 6-Dimethy1-1-(α-D-ribofuranosyl)benzimidazolet

Abstract

Two procedures for the synthesis of the title compound, i. e., the coupling reaction of 5, 6dimethylbenzimidazolew ith 2, 3, 5 -tri-O-benzyl-β-D-ribofuranosyblr omide, which was prepared from methyl 2, 3, 5 -tri-O-benzyl-α-o r -β-D-riboluranosideb y treatment with excess acetyl bromide in the presence of a catalytic amount of methanol, and the reaction of 5, 6dimethylbenzimidazolew ith N, N '-diisopropy1-O-(23, - O-isopropylidene-5-O-trityl-D-ribofuranosyl)isourea, which was prepared from diisopropylcarbodiimidaen d the correspongng 1 -OH sugar derivative with the catalytic amount of copper( I) chloride, are described in addition to some basic aspects of the above chemistry. t Partial Protection of Carbohydrate Derivatives. X.