[1-[2'-O-(tert-butyldimethylsilyl)-5'-O-(thexyldimethylsilyl)-β-D-ribofuranosyl]-3-N-methylthymine]-3'-spiro-5''-[4''-amino-1'',2''-oxathiole-2'',2''-dioxide] 、
苯甲酰异氰酸脂 在
sodium hydride 作用下,
以
四氢呋喃 为溶剂,
以98%的产率得到[1-[2'-O-(tert-butyldimethylsilyl)-5'-O-(thexyldimethylsilyl)-β-D-ribofuranosyl]-3-N-methylthymine]-3'-spiro-5''-[4''-(3-benzoylureido)-1'',2''-oxathiole-2'',2''-dioxide]