Phosphoric acid (2R,3S,5R)-5-(6-amino-purin-9-yl)-2-[bis-(4-methoxy-phenyl)-phenyl-methoxymethyl]-tetrahydro-furan-3-yl ester (2R,3S,5R)-5-(6-amino-purin-9-yl)-3-(tert-butyl-dimethyl-silanyloxy)-tetrahydro-furan-2-ylmethyl ester 2-cyano-ethyl ester 在
六氟异丙醇 作用下,
反应 4.5h,
以68%的产率得到