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A novel transpurination reaction of tetraacetylguanosine was successfully applied for the preparation of 9-(2-hydroxyethoxymethyl)-and 9-(1,3-dihydroxy-2-propoxymethyl)guanines (compounds 1 and 2, respectively). Yield of the desired 9-isomers was significantly increased by application of the thermal 7=9 transglycosylation.
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