[CH2:1]([O:3][C:4]([C:6]1([NH:18][C:19]([O:21][C:22]([CH3:25])([CH3:24])[CH3:23])=[O:20])[CH2:9][CH:8]([O:10]CC2C=CC=CC=2)[CH2:7]1)=[O:5])[CH3:2].C(OCC)(=O)C.[H][H]>C(O)C.[Pd]>[CH2:1]([O:3][C:4]([C:6]1([NH:18][C:19]([O:21][C:22]([CH3:23])([CH3:25])[CH3:24])=[O:20])[CH2:7][CH:8]([OH:10])[CH2:9]1)=[O:5])[CH3:2]The 1-(N-(t-butoxycarbonyl)amino)-3-benzyloxy-cyclobutane-1-carboxylic acid ethyl ester synthesized as above is dissolved in an alcohol solvent such as ethanol or an acetate ester solvent such as ethyl acetate ester, and palladium-on-activated carbon (amount: 10 w/w % or more relative to the substrate) is added to the solution in an atmosphere of hydrogen to allow them to react under stirring at room temperature. The reaction solution is then filtered through Celite, and the filtrate is concentrated and purified to yield 1-(N-(t-butoxycarbonyl)amino)-3-hydroxy-cyclobutane-1-carboxylic acid ethyl ester (Step 4).
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