Chloroacetic anhydride → HCID 22914351, compound
Reaction equation
[F:1][C:2]1[CH:3]=[CH:4][C:5]2[N:11]3[CH:12]=[N:13][C:14]([C:15](=[N:17][OH:18])[NH2:16])=[C:10]3[CH2:9][N:8]([CH3:19])[C:7](=[O:20])[C:6]=2[CH:21]=1.[Cl:22][CH2:23][C:24](OC(=O)CCl)=O>CN(C)C=O>[Cl:22][CH2:23][C:24]1[O:18][N:17]=[C:15]([C:14]2[N:13]=[CH:12][N:11]3[C:5]4[CH:4]=[CH:3][C:2]([F:1])=[CH:21][C:6]=4[C:7](=[O:20])[N:8]([CH3:19])[CH2:9][C:10]=23)[N:16]=1Participants
4
Procedure
A suspension of 5.8 g (0.020 mol) of 8-fluoro-5,6-dihydro-5-methyl-6-oxo-4H-imidazo[1,5-a][1,4]benzodiazepine-3-carboxamidoxime in 60 ml of dimethylformamide was treated with 3.9 g (0.023 mol) of chloroacetic anhydride. The yellow solution obtained was stirred at 100° for 11/2 hr. and then completely freed from solvents. The oily product crystallized from acetonitrile and was filtered off. The mother liquor was concentrated, the residue was chromatographed over silica gel with dichloromethane/methanol 97:3 as the eluent and the additional portion of product obtained was recrystallized from acetonitrile. There were obtained a total of 4.05 g (59%) of 3-(5-chloromethyl-1,2,4-oxadiazol-3-yl)-8-fluoro-5-methyl-5,6-dihydro-4H-imidazo[1,5-a][1,4]benzodiazepin-6-one as white crystals; m.p. 245°-247°.