[F:1][C:2]1[CH:19]=[CH:18][C:5]([CH2:6][CH2:7][CH:8]2[CH2:13][CH:12]([C:14]([O:16][CH3:17])=[O:15])[CH2:11][CH2:10][NH:9]2)=[CH:4][CH:3]=1.CCN(C(C)C)C(C)C.[C:29](Cl)(=[O:32])[O:30][CH3:31].Cl>ClCCl>[F:1][C:2]1[CH:19]=[CH:18][C:5]([CH2:6][CH2:7][CH:8]2[CH2:13][CH:12]([C:14]([O:16][CH3:17])=[O:15])[CH2:11][CH2:10][N:9]2[C:29]([O:30][CH3:31])=[O:32])=[CH:4][CH:3]=1
Methyl 2-(4-fluorophenethyl)piperidine-4-carboxylate (3.89 g, 14.65 mmol) was dissolved in dichloromethane (150 mL). DIPEA (3.06 mL, 17.58 mmol) was added, followed by methyl carbonochloridate (1.615 mL, 20.51 mmol). The mixture was stirred at room temperature for 2 h. 0.1 HCl and DCM were added. The phases were separated and the aqueous phase was extracted with DCM. The combined organic layers were washed with satd NaHCO3, filtered through a phase separator and evaporated. Dimethyl 2-(4-fluorophenethyl)piperidine-1,4-dicarboxylate (3.19 g, 67%) was isolated. MS m/z 324 (M+H)+
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