Water → ethyl 3-{2-chloro-5-[1-methyl-1-(4-trifluoromethyl-6H-pyrazolo[4',3':3,4]benzo[1,2-d]thiazol-2-ylcarbamoyl)-ethylamino]-benzoylamino}-propionate

Participants

Reaction Steps

0.1 g (0.25 mmol) of 2-bromo-2-methyl-N-(4-trifluoromethyl-6H-pyrazolo[4′,3′:3,4]benzo[1,2-d]thiazol-2-yl)-propionamide and 0.23 g (0.85 mmol) of ethyl 3-(5-amino-2-chlorobenzoylamino)-propionate were heated at 100° C. in 4 ml of ethylene glycol. After the completion of the reaction was confirmed by HPLC, the mixture was cooled to room temperature, and 4 ml of water was added to the mixture. The mixture was extracted with 4 ml of ethyl acetate twice, dried over 3 g of anhydrous magnesium sulfate, and then concentrated under reduced pressure. The crude product was purified by silica gel column chromatography (hexane/ethyl acetate=1/1) to give 20 mg of ethyl 3-{2-chloro-5-[1-methyl-1-(4-trifluoromethyl-6H-pyrazolo[4′,3′:3,4]benzo[1,2-d]thiazol-2-ylcarbamoyl)-ethylamino]-benzoylamino}-propionate.

Provenance & Evidence