(R)-4-<α-<(methoxycarbonyl)amino>-4,6-dimethyl-9-oxo-3-(2,3,5-tri-O-acetyl-β-D-ribofuranosyl)-4,9-dihydro-3H-imidazo<1,2-a>purin-7-yl>butanoic acid 、
三甲基硅烷化重氮甲烷 以
甲醇 、
苯 为溶剂,
以100%的产率得到(R)-4-<α-<(methoxycarbonyl)amino>-4,6-dimethyl-9-oxo-3-(2,3,5-tri-O-acetyl-β-D-ribofuranosyl)-4,9-dihydro-3H-imidazo<1,2-a>purin-7-yl>butanoic acid methyl ester