乙酸酐 、
5'-O-(4,4'-dimethoxytriphenylmethyl)-3'-O-[(diisopropylamino)(2-cyanoethyl)phosphino]-9-hydroxy-1,N6-benzetheno-2'-deoxyadenosine 在
吡啶 作用下,
以52%的产率得到Acetic acid 3-{(2R,4S,5R)-5-[bis-(4-methoxy-phenyl)-phenyl-methoxymethyl]-4-[(2-cyano-ethoxy)-diisopropylamino-phosphanyloxy]-tetrahydro-furan-2-yl}-3H-1,3,4,5a,10-pentaaza-cyclopenta[a]fluoren-8-yl ester