{S-[N4-(benzyloxycarbonyl)-1-(ω-carbonylmethyl)cytosine-6-methyl]-L-cysteine ester}-{S-[N4-(benzyloxycarbonyl)-1-(ω-carbonylmethyl)cytosine-6-methyl]-L-cysteine methyl ester}-{S-[1-(ω-carbonylmethyl)uracil-6-methyl]-L-cysteine methyl ester}-S-{1-[(tert-butoxy)carbonylmethyl]uracil-6-methyl}-L-cysteine methyl ester 、
乙酸酐 在
2,6-二甲基吡啶 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
反应 4.5h,
以90%的产率得到{N-acetyl S-[N4-(benzyloxycarbonyl)-1-(ω-carbonylmethyl)cytosine-6-methyl]-L-cysteine ester}-{S-[N4-(benzyloxycarbonyl)-1-(ω-carbonylmethyl)cytosine-6-methyl]-L-cysteine methyl ester}-{S-[1-(ω-carbonylmethyl)uracil-6-methyl]-L-cysteine methyl ester}-S-{1-[(tert-butoxy)carbonylmethyl]uracil-6-methyl}-L-cysteine methyl ester