反应详情

A suspension of 1.0 g (0.00263 mol) of 7-chloro-3-(4-chloromethyl-thiazol-2-yl)-5-methyl-5,6-dihydro-4H-imidazo[1,5-a][1,4]benzodiazepin-6-one in 60 ml of tetrahydrofuran was treated with 7.2 ml (0.0527 mol) of dipropylamine and 5 ml of dimethylformamide. After stirring at reflux for 16 hrs. the suspension obtained was filtered and the solution was completely freed from the solvents. The residue was chromatographed over silica gel with ethyl acetate as the eluent and recrystallized from hot isopropyl ether. There was obtained 0.52 g (44%) of 7-chloro-3-(4-dipropylaminomethyl-thiazol-2-yl)-5-methyl-5,6-dihydro-4H-imidazo(1,5-a][1,4]benzodiazepin-6-one as white crystals; m.p. 121-123°.

1. temperatureat reflux for 16 hrs
2. customthe suspension obtained
3. filtrationwas filtered
4. customThe residue was chromatographed over silica gel with ethyl acetate as the eluent
5. customrecrystallized from hot isopropyl ether