[C:1]([N:8]1[CH2:15][CH2:14][CH2:13][C@@H:9]1[C:10](O)=O)([O:3][C:4]([CH3:7])([CH3:6])[CH3:5])=[O:2].[CH3:16]O>>[C:1]([N:8]1[CH2:15][CH2:14][CH2:13][C@@H:9]1[C:10]#[CH:16])([O:3][C:4]([CH3:7])([CH3:6])[CH3:5])=[O:2]The title compound was prepared from N-BOC-(R)-proline according to the procedures of Examples 1a-c above. [α]D≤ +113.0 (c 0.94, MeOH).
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