Treatment, of 5'-O-dimethoxytritylthymidine 1 and of 4-N-benzyloxycarbonyl-2'-deoxy-5'-O-dimethoxytrityl-cytidine 12 with a mixture of 6-(benzyloxycarbonylamino)hexanoic acid, dicyclohexylcarbodiimide and 4-(dimethy1amino)pyridine yielded 3'-O-acylated derivatives 2 and 13.These were further converted into Paper 4/06243D
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