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Reaction of 5’ -O-p-methoxytritylthymidine with 1, 1’ - carbonyl - diimidazole gave the 3’-o-carbonylimidazolide, which was condensed in high yield with 3’-O-protected thymidine to givea dinucleoside carbonate. In the synthesis of dinucleoside carbonate, allyl can be used as a goodprotecting group for 3’-hydroxyl of thymidine. The condition of deprotection will not affect thecarbonate bridges.