Dimethylformamide → 2,3-Dihydro-1-benzoxepine-4-carboxamide

Participants

Reaction Steps

To a suspension of 7-(4-methylphenyl)-2,3-dihydro-1-benzoxepine-4-carboxylic acid (0.15g) in dichloromethane (6ml) were added oxalyl chloride (0.14ml) and dimethylformamide (catalytic amount) under ice-cooling, and the mixture was stirred at room temperature for 2 hours. The solvent was evaporated, and the residue was dissolved in tetrahydrofuran. The mixture was dropwise added to a solution of 4-((N-(3,5-dimethylcyclohexyl)-N-methyl)-aminomethyl)aniline (0.13g) and triethylamine (0.23ml) in tetrahydrofuran (10ml), under ice-cooling. Under nitrogen atmosphere, the mixture was stirred at room temperature over night. The solvent was evaporated, and to the residue was added water. The mixture was extracted with ethyl acetate. The organic layer was washed with water and saturated sodium chloride solution, and dried with anhydrous magnesium sulfate. Under reduced pressure, the solvent was evaporated to give crude crystals, which were recrystallized from diethyl ether-hexane to give N-(4-((N-methyl-N-(3,5-dimethylcyclohexyl))aminomethyl)-phenyl)-7-(4-methylphenyl)-2,3-dihydro-1-benzoxepine-4-carboxamide methylphenyl)-2,3-dihydro-1-benzoxepine-4-carboxamide (Compound 133) (0.22g) as colorless crystals.

Provenance & Evidence