1,2-Dichloroethane → Biphenyl-2-ylcarbamic Acid 1-{2-[(4-Formylbenzoyl)methylamino]ethyl}piperidin-4-yl Ester

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Reaction Steps

To a three-necked 1-L flask was added 4-carboxybenzaldehyde (4.77 g, 31.8 mmol), EDC (6.64 g, 34.7 mmol), HOBT (1.91 g, 31.8 mmol), and DCM (200 mL). When the mixture was homogenous, a solution of biphenyl-2-ylcarbamic acid 1-(2-methylaminoethyl)piperidin-4-yl ester (10 g, 31.8 mmol; prepared as described in Preparation 9) in DCM (100 mL) was added slowly. The reaction mixture was stirred at room temperature for 16 hours and then washed with water (1×100 mL), 1N HCl (5×60 mL), 1N NaOH (1×100 mL) brine (1×50 mL), dried over sodium sulfate, filtered and concentrated to afford 12.6 g of the title compound (92% yield; 85% purity based on HPLC). MS m/z: [M+H+] calcd for C29H31N3O4, 486.2; found, 486.4. Rf=3.12 min (10-70 ACN:H2O, reverse phase HPLC).

Provenance & Evidence