Development of a novel synthetic process for 2-deoxy-3,5-di-O-p-toluoyl-alpha-L-ribofuranosyl chloride: A versatile intermediate in the synthesis of 2 '-deoxy-L-ribonucleosides

摘要

A novel synthetic route to 2-deoxy-3,5-di-O-p-toluoyl-alpha-L-ribofuranosyl chloride (1) from inexpensive D-xylose (3) is described. 1 is a key intermediate in the synthesis of the antiviral agent 1-(2-deoxy-beta-L-ribofuranosyl)thymine (beta-L-thymidine) (2) and other 2'-deoxy-L-ribonucleosides. This seven-step synthesis employs a key conversion of the D to the L configuration of the sugar moiety (6 to 7 in Scheme 1) using simple reagents and reaction conditions. The entire process involves only three isolation steps. The key compound (1) was produced in 11% overall yield without chromatography.