1,2-Dichloroethane → 1-[(3,4-dihydro-6-methoxy-2,5,7,8-tetramethyl-2H-benzopyran-2-yl)acetyl]-4-(2,3,4-trimethoxybenzyl)piperazine

Participants

Reaction Steps

To a solution composed of 2.54 g (0.01 mol) of 1-(2,3,4-trimethoxyphenyl)methylpiperazine, 0.95 g of pyridine and 50 ml of 1,2-dichloroethane was added 3.56 g (0.012 mol) of the (3,4-dihydro-6-methoxy-2,5,7,8-tetramethyl-2H-benzopyran-2-yl)acetyl chloride prepared above and the mixture was stirred at room temperature overnight. The reaction mixture was poured into water and extracted with diethyl ether. The extract was washed with water and then with a saturated aqueous solution of sodium chloride, dried over anhydrous sodium sulfate and filtered. Low-boiling substances were distilled off from the filtrate under reduced pressure and the residue was purified by silica gel column chromatography. The eluate was further purified by recrystallization from a 95:5 (v/v) mixture of hexane and ethyl acetate to give 1.4 g of 1-[(3,4-dihydro-6-methoxy-2,5,7,8-tetramethyl-2H-benzopyran-2-yl)acetyl]-4-(2,3,4-trimethoxybenzyl)piperazine [Compound (28)] having the following physical characteristics.

Provenance & Evidence