1-(3'-amino-5'-O-benzyl-2'-O-tert-butyldimethylsilyl-3'-C-cyano-3'-deoxy-3'-N-phenylmethanesulfonyl-β-D-ribofuranosyl)-3-N-tert-butoxycarbonylthymine 在
lithium diisopropyl amide 作用下,
以
四氢呋喃 为溶剂,
反应 0.25h,
以76%的产率得到[1-[5'-O-benzyl-2'-O-tert-butyldimethylsilyl-β-D-ribofuranosyl]-3-N-tert-butoxycarbonylthymine]-3'-spiro-3''-(2''-H-4''-amino-2'',3''-dihydro-1'',1''-dioxo-isothiazole-5''-phenyl)