N
2-isobutyryl-2',3'-O-isopropylideneguanosine 、
(4S,5R)-3-Acetyl-2,2-dimethyl-4-phenyl-oxazolidine-5-carboxylic acid 在
N,N'-二环己基碳二亚胺 、
4-二甲氨基吡啶 作用下,
以
甲苯 、
氯仿 为溶剂,
反应 3.5h,
以39%的产率得到(4S,5R)-3-Acetyl-2,2-dimethyl-4-phenyl-oxazolidine-5-carboxylic acid (3aR,4R,6R,6aR)-6-(2-isobutyrylamino-6-oxo-1,6-dihydro-purin-9-yl)-2,2-dimethyl-tetrahydro-furo[3,4-d][1,3]dioxol-4-ylmethyl ester