Verfahren zur Herstellung von N4-acyl-5'-desoxy-5-fluorocytidinderivate

摘要

A novel process for producing N<4>-acyl-5'-deoxy-5-fluorocytidine derivatives using the novel 5'-deoxy-5-fluoro-N<4>,2'-O,3'-O-triacylcytidine derivatives are provided. 5-Deoxy-1,2,3-tri-O-acyl- beta -D-ribofuranoside is reacted with 5-fluorocytosine to produce 5'-deoxy-2',3'-di-O-acyl-5-fluorocytidine, followed by acylation. The acyl radicals of the obtained 5'-deoxy-5-fluoro-N<4>,2'-O,3'-O-triacylcytidine derivatives are selectively de-O-acylated to obtain N<4>-acyl-5'-deoxy-5-fluorocytidine derivatives. From fluorocytosine, N<4>-acyl-5'-deoxy-5-fluorocytidine derivatives can be obtained through very few steps in high yield.