反应详情

2 g of 4-(4-(piperazin-1-yl)phenyl)-3,4-dihydro-2H-quinoxaline-1-carboxylic acid tert-butyl ester are placed in a 250 ml round-bottomed flask under an inert atmosphere. 72 ml of anhydrous dichloromethane are added and then, at 0° C., 1.22 ml of chloroethylsulphonyl chloride are added, followed by 3.67 ml of triethylamine. The reaction mixture is allowed to return gently to ambient temperature. The reaction mixture is stirred at ambient temperature for 3 h before being diluted with dichloromethane. The organic phase is washed with a saturated aqueous sodium hydrogencarbonate solution and the aqueous phase is extracted with dichloromethane. The organic phases are combined and washed with water, then dried over sodium sulphate, filtered through a sintered glass filter and concentrated under reduced pressure. 1.01 g of 4-[4-(4-(ethenesulphonyl)piperazin-1-yl)phenyl]-3,4-dihydro-2H-quinoxaline-1-carboxylic acid tert-butyl ester are obtained in the form of a white solid, after purification on a silica column, elution being carried out with a heptane/ethyl acetate gradient varying from 95/5 to 40/60.

1. customto return gently to ambient temperature
2. washThe organic phase is washed with a saturated aqueous sodium hydrogencarbonate solution
3. extractionthe aqueous phase is extracted with dichloromethane
4. washwashed with water
5. dry with materialdried over sodium sulphate
6. filtrationfiltered through a sintered glass
7. filtrationfilter
8. concentrationconcentrated under reduced pressure