Dimethylamine → HCID 70393278, compound

Participants

Reaction Steps

To a stirred solution of dimethylamine (25 ml, 0.38 mol) in 150 ml of methanol at 0° C. under nitrogen, was added 2-chloro-N-[1,2-diphenyl-1-(trifluoromethyl)ethyl]acetamide (from Example 1) (7.0 g, 0.020 mol). The mixture was allowed to slowly warm to ambient temperature and stirred for 48 hours. The solvent was evaporated and the residue was dissolved in 150 ml of chloroform and 150 ml of water. The aqueous solution was basified to a pH of 10 with 50% NaOH. The phases were separated, the aqueous phase extracted with chloroform (2×75 ml) and the combined organic phases were washed with brine (75 ml), dried and evaporated to a dark oil, 7.2 g. This oil was purified by chromatograhy on a Prep 500 HPLC on silica gel, eluting with 10% ethylacetate/hexane. Pure fractions were combined and evaporated to 4.0 g of an oil. This oil was dissolved in 125 ml of methanol and treated with maleic acid (1.3 g, 0.012 mol) at reflux. The solution was concentrated to a volume of 75 ml. The crystalline salt which formed, was vacuum dried to give 3.61 g of 2-(dimethylamino)-N-[1,2-diphenyl-1-(trifluoromethyl)ethyl]acetamide maleate as a white solid, mp 213°-215° C.

Provenance & Evidence