5-Chloro-6-methylthio-1-(2,3,4-tri-o-acetyl-beta-d-ribopyranosyl)-1h-benzimidazole 、
6-Chloro-5methylthio-1-(2,3,4-tri-O-acetyl-beta-D-ribopyranosyl)-1H-benzimidazole 、
N-溴代丁二酰亚胺(NBS) 、 在
silica gel 、
二氯甲烷 、
二氧化碳 、
甲醇 作用下,
以
四氢呋喃 为溶剂,
反应 2.0h,
以2-Bromo-5-chloro-6-methylthio-1-(2,3,4-tri-O-acetyl-beta-D-ribopyranosyl)-1H-benzimidazole eluted first (RT=5.78 min) and 0.047 g was obtained的产率得到2-bromo-5-chloro-6-methylthio-1-(2,3,4-tri-O-acetyl-beta-D-ribopyranosyl)-1H-benzimidazole