(S)-2-carboxymethylamino-4-iodobutyric acid methyl ester 、
7-iodo-4,6-dimethyl-3-(2,3,5-tri-O-acetyl-β-D-ribofuranosyl)-4,9-dihydro-3H-imidazo<1,2-a>purin-9-one 在
异丙基氯化镁 、 copper(I) cyanide di(lithium chloride) 作用下,
以
四氢呋喃 为溶剂,
反应 16.5h,
以50%的产率得到(S)-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