Diethylamine → N-(4-{4-[Diethylcarbamoyl-(3-fluoro-phenyl)-methylene]-piperidin-1-yl}-3-fluoro-phenyl)-2-ethyl-butyramide

Participants

Reaction Steps

2-[1-(4-Amino-2-fluoro-phenyl)-piperidin-4-ylidene]-N,N-diethyl-2-(3-fluoro-phenyl)-acetamide. A solution of [1-(2-fluoro-4-nitro-phenyl)-piperidin-4-ylidene]-(3-fluoro-phenyl)-acetonitrile in 48% HBr (75 mL) was stirred at 100° C. for 8 h. The mixture was cooled to rt and diluted with H2O (500 mL). The resulting yellow solid was collected by filtration and dried under vacuum. A mixture of this yellow solid and DMF (0.50 mL) in DCE (100 mL) was treated with (COCl)2 (100 mmol) dropwise and was stirred at rt for 30 min. The mixture was concentrated and dried under vacuum. The residue was diluted with DCE (100 mL) and treated with TEA (2.8 mL, 20 mmol) and Et2NH (1.1 mL, 10 mmol). The reaction mixture was stirred at rt for 4 h, then was washed with H2O (100 mL). The organic layer was separated and concentrated. The residue was dissolved in 1:1 EtOH/EtOAc (100 mL), treated with SnCl2.2H2O (10 g), and heated at 100° C. for 16 h. The mixture was cooled to rt, diluted with ice water (100 mL), basified to pH=9 with NaHCO3, and extracted with EtOAc (3×200 mL). The organic layers were combined, dried (Na2SO4), and concentrated to give the crude title compound.

Provenance & Evidence