在
三乙基硅烷 、
甲烷磺酸 作用下,
以95%的产率得到2,2-Dimethyl-propionic acid (2R,3S,5R)-3-[(2R,3S,5R)-3-mercapto-5-(5-methyl-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-tetrahydro-furan-2-ylmethoxymethylsulfanyl]-5-(5-methyl-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-tetrahydro-furan-2-ylmethyl ester