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An Improved Synthesis of Isonucleoside of Tubercidin

An efficient approach for the synthesis of isonucleoside of tubercidin was described. The key step in the synthesis was the direct coupling of pyrrolo [2,3-d] pyrimidine with the cyclic sulfate of 1-deoxy-D-ribose. This reaction proceeded with high regiospecificity and stereospecificity and could have broad application for the synthesis a series of isonucleoside.