[C:1]([N:8]1[CH2:11][C:10](=O)[CH2:9]1)([O:3][C:4]([CH3:7])([CH3:6])[CH3:5])=[O:2].[CH3:13][NH:14][CH2:15][C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1.[BH-](OC(C)=O)(OC(C)=O)OC(C)=O.[Na+]>ClCCCl.C(O)(=O)C>[CH2:15]([N:14]([CH3:13])[CH:10]1[CH2:11][N:8]([C:1]([O:3][C:4]([CH3:7])([CH3:6])[CH3:5])=[O:2])[CH2:9]1)[C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1
To a solution of 1-Boc-azetidin-3-one 1d (1.0 g, 5.85 mmol) and N-methyl-benzylamine 6a (1.02 g, 8.43 mmol) in 1,2-dichloroethane (12 mL) and acetic acid (1 mL) was added Na(OAc)3BH (1.30 g, 6.13 mmol). The reaction mixture was stirred at room temperature for 20 h. The reaction was quenched by the addition of aq. NaHCO3. The resulting mixture was extracted with CH2Cl2. The organic solution was dried over Na2SO4 and concentrated. Purification by flash column chromatography (silica gel, 40% EtOAc/heptane) gave compound 6b (1.40 g).
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