[1-[2'-O-tert-butyldimethylsilyl-β-D-ribofuranosyl]-3-N-methylthymine]-3'-spiro-3''-(4''-amino-2'',3''-dihydro-2''-N-methyl-1'',1''-dioxo-isothiazole-5''-phenyl) 、
叔丁基二甲基氯硅烷 在
咪唑 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
以75%的产率得到[1-[2',5'-bis-O-tert-butyldimethylsilyl-β-D-ribofuranosyl]-3-N-methylthymine]-3'-spiro-3''-(4''-amino-2'',3''-dihydro-2''-N-methyl-1'',1''-dioxo-isothiazole-5''-phenyl)