Triethylamine → Ethyl 2-{4-[2-(2-chlorocinnamoylamino)-ethyl]-phenoxy}-2-methylpropionate

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

To a mixture of 11.50 g. (63 mMol) o-chlorocinnamic acid, 200 ml. anhydrous tetrahydrofuran and 6.38 g. (63 mMol) anhydrous triethylamine, there are added dropwise at -15° C., 7.50 g. (69 mMol) ethyl chloroformate. The reaction mixture is then stirred for 15 minutes at -15° C. Subsequently, a solution of 15.80 g. (63 mMol) ethyl 2-[4-(2-aminoethyl)phenoxy]-2-methylpropionate in 50 ml. anhydrous tetrahydrofuran is added dropwise thereto and the reaction mixture is stirred for a further 2 hours at -10° C. and then left to stand for a day at ambient temperature. Thereafter, the tetrahydrofuran is distilled off in a vacuum and the residue is taken up in methylene chloride. The methylene chloride phase is extracted with 0.5 N aqueous sodium hydroxide solution, filtered, dried over anhydrous sodium sulphate and evaporated. After recrystallization of the residue from a mixture of ligroin and acetone (30:5 v/v), there is obtained, in a yield of 65% of theory, ethyl 2-{4-[2-(2-chlorocinnamoylamino)-ethyl]-phenoxy}-2-methylpropionate, which melts at 76° C.

Herkunft & Nachweise