Process and novel intermediates for preparing 2-aminocarboxylic acid esters of the 5-hydroxymethyl group of levovirin (1-(3S,4R-dihydroxy-5S-hydroxymethyl-tetrahydro-furan-2S-yl)-1H-[1,2,4]triazole-3-carboxylic acid amide; Id: R
1
═R
2
═R
3
═H) and acid addition salts thereof. The present process provides the monoesters selectively in high purity with increased efficiency with reduced number of production steps. The process involves condensation of a cyclopentylidene levovirin compound with a N-urethane-N-carboxylic anhydride and subsequent deprotection to directly provide the hydrochloride salt of the product. The mono esters are useful for treatment of viral diseases and are absorbed more efficiently than the parent compound.
制备左旋维林(1-(3S,4R-dihydroxy-5S-hydroxymethyl-tetrahydro-furan-2S-yl)-1H-[1,2,4]triazole-3-carboxylic acid amide)
5-羟甲基的 2-
氨基
羧酸酯的工艺和新型中间体;Id:R
1
═R
2
═R
3
═H)及其酸加成盐。本工艺可选择性地提供高纯度的单酯,提高了生产效率,减少了生产步骤。该工艺包括将
环戊烯基左旋维林化合物与 N-
氨基
乙烷-N-
羧酸酐缩合,然后进行脱保护,以直接提供产品的盐酸盐。单酯可用于治疗病毒性疾病,其吸收效率高于母体化合物。