Synthesis of Methyl 1-(2,3,5-Tri-<i>O</i>-acetyl-β-<scp>l</scp>-ribofuranosyl)-1,2,4- triazole-3-carboxylate from <scp>l</scp>-Ribose: From a Laboratory Procedure to a Manufacturing Process
作者:Pingsheng Zhang、Zhiming E. Dong、Thomas P. Cleary
DOI:10.1021/op050051m
日期:2005.9.1
A two-step manufacturing process for methyl 1-(2,3,5-tri-O-acetyl-beta-L-ribofuranosyl)-1,2,4-triazole-3-carboxylate (1) was developed. In step 1, L-ribose was converted to a beta/alpha mixture of 1,2,3,5-tetra-O-acetyl-L-ribofuranoses (2 and 4). The step contained four chemical transformations and was completed in "one-pot" in approximately 95% yield. The crude step 1 product was reacted with methyl 1,2,4-triazole-3-carboxylate (3) in step 2 to produce 1. The successful utilization of both isomers (2 and 4) in step 2 offered advantages of higher overall yield and a much simplified process by eliminating the isolation of pure 2. The process was successfully scaled up to the pilot plant and subsequently in a manufacturing campaign using commercial production facilities.