[(2R,3R,4S,5R,6R)-3,4,5-triacetyloxy-6-[(Z)-[[(E)-dimethylaminomethylideneamino]-methylsulfanylmethylidene]amino]oxan-2-yl]methyl acetate 、
丙二酸甲酯酰氯 在
三乙胺 作用下,
以
二氯甲烷 为溶剂,
反应 4.0h,
以82%的产率得到methyl 2-methylsulfanyl-6-oxo-1-[(2R,3R,4S,5R,6R)-3,4,5-triacetyloxy-6-(acetyloxymethyl)oxan-2-yl]pyrimidine-5-carboxylate