[1-[2',5'-bis-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
potassium carbonate 作用下,
以
乙腈 为溶剂,
以75%的产率得到[1-[2',5'-bis-O-(thexyldimethylsilyl)-β-D-ribofuranosyl]-3-N-methylthymine]-3'-spiro-5''-[4''-(3-benzoylureido)-1'',2''-oxathiole-2'',2''-dioxide]