[CH3:1][C@@H:2]1[C@@H:7]([O:8][C:9](=[O:14])[C:10]([CH3:13])([CH3:12])[CH3:11])[CH2:6][CH2:5][NH:4][CH2:3]1.[CH3:15][C@@H:16]1[CH2:18][O:17]1>C(O)C>[OH:17][C@H:16]([CH3:18])[CH2:15][N:4]1[CH2:5][CH2:6][C@H:7]([O:8][C:9](=[O:14])[C:10]([CH3:13])([CH3:12])[CH3:11])[C@@H:2]([CH3:1])[CH2:3]1A solution of piperidine 17 (2 g, 10.8 mmol) and (R)-2-Methyl-oxirane (3.78 ml, 54 mmol) in 2 ml of ethanol is stirred for 24 hours in a closed flask. The solvent is evaporated and the residue distilled in a Kugelrohr apparatus (0.08 mbar, 75-90 C).
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