5'-N-[4-{(2S)-2-(N-tert-butoxycarbonyl)aminobutyric acid}]-tert-butyl ester-5'-deoxy-2',3'-O,O-(1-methyl ethylidene)adenosine 、
1-[4-(formyl)phenyl]-2,3-bis-(tert-butoxycarbonyl)guanidine 在
三乙酰氧基硼氢化钠 、 magnesium sulfate 作用下,
以
1,2-二氯乙烷 为溶剂,
以71%的产率得到5'-deoxy-5'-[[(3S)-4-(tert-butoxy)-3-[[(1,1-dimethylethoxy)carbonyl]amino]-4-oxobutyl][[4-[2,3-bis(tert-butoxycarbonyl)]guanidinophenyl]methyl]amino]-2',3'-O-(1-methylethylidene)adenosine