[O:1]=[C:2]1[CH2:6][CH2:5][C@H:4]([C:7]([OH:9])=[O:8])[CH2:3]1>C(Cl)(Cl)Cl>[O:1]=[C:2]1[CH2:6][CH2:5][C@H:4]([C:7]([O:9][C:4]([CH3:7])([CH3:5])[CH3:3])=[O:8])[CH2:3]1The title compound tert-Butyl (1S)-3-Oxocyclopentane carboxylate was prepared starting from (1S)-3-Oxocyclopentane carboxylic acid (Sung, S-Y., Frahm, A. W. Arch. Pharm. Pharm. Med. Chem. 1996 329, 291-300) according to Procedure A. [α]D20=25.5° (c=7.93, chloroform).
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