A practical synthesis of ethyl 1,2,4-triazole-3-carboxylate and its use in the formation of chiral 1′,2′-<i>seco</i>-nucleosides of ribavirin
作者:Purushotham Vemishetti、Robert W. Leiby、Elie Abushanab、Raymond P. Panzica
DOI:10.1002/jhet.5570250253
日期:1988.3
A practical and efficient synthesis of ethyl 1,2,4-triazole-3-carboxylate (6a, R' = H) from ethyl carboethoxyformimidate hydrochloride (7) is described. Alkylation of this heterocycle with the chloromethyl ethers of 1,3-O-dibenzylbutane-1,2R,3S-triol (8a) and 1,3,4-O-tribenzylbutane-1,2R,3S,4-tetrol (8b), followed by conversion of the ester function to the amide and deprotection, furnished the chiral