Carbamic acid, ethyl ester → 2-(3-ethoxycarbonyl-N-methyl-3-aza-propanamido)-5-chlorobenzophenone hydrochloride

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Reaction Steps

7.3 g of 2-(N-methyl-bromoacetamido)-5-chlorobenzophenone are heated in 200 ml of anhydrous xylene with 2.2 g of triethylamine and 2 g of urethane (NH2COOC2H5) for 12 hours under reflux whilst stirring. The triethylamine hydrobromide which has precipitated is filtered off with suction after cooling, the filtrate is extracted by shaking with three times 250 ml of water and the organic phase is dried over potassium carbonate, filtered and evaporated in vacuo. The oily residue is dissolved in 400 ml of anhydrous diethyl ether and filtered and 6.5 g of 2-(3-ethoxycarbonyl-N-methyl-3-aza-propanamido)-5-chlorobenzophenone hydrochloride (79% of theory), with a melting point of 156°-158°, are obtained by passing dry hydrogen chloride gas into the ethereal solution.

Provenance & Evidence