O2',O3'-isopropylidene-5-methylaminomethyl-2-thio-uridine 、
氯甲酸-2,2,2-三氯乙酯 以
吡啶 为溶剂,
以71%的产率得到[1-((3aR,4R,6R,6aR)-6-Hydroxymethyl-2,2-dimethyl-tetrahydro-furo[3,4-d][1,3]dioxol-4-yl)-4-oxo-2-thioxo-1,2,3,4-tetrahydro-pyrimidin-5-ylmethyl]-methyl-carbamic acid 2,2,2-trichloro-ethyl ester