S(Cl)(Cl)=O.[Br:5][C:6]1[CH:14]=[CH:13][CH:12]=[CH:11][C:7]=1[C:8]([OH:10])=O.[N+:15]([C:18]1[CH:24]=[CH:23][C:21]([NH2:22])=[CH:20][CH:19]=1)([O-:17])=[O:16]>C1(C)C=CC=CC=1.CN(C)C=O.CN1C(=O)CCC1>[Br:5][C:6]1[CH:14]=[CH:13][CH:12]=[CH:11][C:7]=1[C:8]([NH:22][C:21]1[CH:23]=[CH:24][C:18]([N+:15]([O-:17])=[O:16])=[CH:19][CH:20]=1)=[O:10]
Thionyl chloride (120.5 g) was added to a stirred mixture of 2-bromobenzoic acid (194 g) in toluene (500 ml) and N,N-dimethylformamide (DMF) (5 ml) and the mixture heated at 80° C. for 4 hours. The solution was cooled to 20° C. and added slowly to a solution of 4-nitroaniline (133.1 g) in toluene (500 ml) and NMP (120 ml), maintaining the temperature of the reaction mixture between 20°-25° C. The reaction mixture was then stirred for 24 hours when a solid precipitated. Water (360 ml) was added with rigorous stirring and the suspended solid collected by filtration, and washed successively with water, toluene and acetonitrile to give 2-bromo-N-(4-nitrophenyl)benzamide (B) as a solid, in 87% yield; m.p. 200°-202° C.; NMR(d6 -DMSO): 7.4-7.8(m, 7H), 8.0(d, 2H), 8.3(d, 2H), 11.5(brs, 1H); which was used without further purification.
불러오는 중…
