[C:1](Cl)(=[O:4])[CH2:2][CH3:3].CCN(C(C)C)C(C)C.[C:15]([SiH2:19][O:20][C:21]([CH3:32])([CH3:31])[C:22]1[CH:23]=[C:24]([CH:27]=[CH:28][C:29]=1[Cl:30])[CH2:25][NH2:26])([CH3:18])([CH3:17])[CH3:16]>C(Cl)Cl>[C:15]([SiH2:19][O:20][C:21]([CH3:32])([CH3:31])[C:22]1[CH:23]=[C:24]([CH:27]=[CH:28][C:29]=1[Cl:30])[CH2:25][NH:26][C:1](=[O:4])[CH2:2][CH3:3])([CH3:18])([CH3:16])[CH3:17]Propionyl chloride (2.02 mL, 23.1 mmol) and DIPEA (14.4 mL, 84.0 mL) were added to a sol. of 3-(tert-butyl-dimethyl-silanyloxymethyl)-4-chloro-benzylamine (6.00 g, 20.9 mmol) in CH2Cl2 (195 mL). The mixture was stirred for 15 min at rt, and more CH2Cl2 was added. The mixture was washed with aq. sat. NH4Cl (2×), with aq. 1M NaOH (1×) and with brine (1×). The org. layer was dried over MgSO4, filtered, and the solvents were removed under reduced pressure. Purification of the crude by FC (EtOAc/heptane 1:9→3:2) yielded the title compound (5.08 g, 71%). LC-MS: tR=1.09 min; ES+: 383.41.
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