ethyl 4-(2'tert.-butyldimethylsilyloxy-2'-methoxy-6'-methyl-5'-phenylthio-3',4'-dihydro-2'H-pyran-4-yl)-butanoate 在
Raney-nickel(W-2)
氢气 作用下,
以
乙醇 为溶剂,
反应 2.0h,
以92%的产率得到methyl 4-(2'-tert.-butyldimethylsilyloxy-2'-methoxy-6'-methyl-3',4'-dihydro-2'H-pyran-4'-yl)butanoate