8-(3,4-bis-benzoyloxy-5-benzoyloxymethyl-3-methyl-tetrahydro-furan-2-yl)-2-methylsulfanyl-4,5-dioxo-3,4,5,8-tetrahydro-pyrido[2,3-d]pyrimidine-6-carboxylic acid ethyl ester 在
氨 作用下,
反应 48.0h,
以25%的产率得到8-(2'-C-methyl-β-D-ribofuranosil)-2-methylsulfanyl-4,5-dioxo-3,4,5,8-tetrahydropyrido[2,3-d]pyrimidine-6-carboxylic acid amide