在
苯磺酸 作用下,
以84%的产率得到4-Oxo-pentanoic acid (2R,3S,5R)-5-(6-benzyloxy-2-benzyloxycarbonylamino-purin-9-yl)-2-[[(2R,3S,5R)-5-(6-benzyloxycarbonylamino-purin-9-yl)-2-hydroxymethyl-tetrahydro-furan-3-yloxy]-(2-chloro-phenoxy)-phosphoryloxymethyl]-tetrahydro-furan-3-yl ester