Methanol → Urea, N-(5-(2-fluorophenyl)-2,3-dihydro-1-methyl-2-oxo-1H-1,4-benzodiazepin-7-yl)-N(sup 1)-(2-hydroxyethyl)-

反応式

C([N:8]([CH2:32][CH2:33][O:34]C(C)(C)C)[C:9]([NH:11][C:12]1[CH:13]=[CH:14][C:15]2[N:21]([CH3:22])[C:20](=[O:23])[CH2:19][N:18]=[C:17]([C:24]3[CH:29]=[CH:28][CH:27]=[CH:26][C:25]=3[F:30])[C:16]=2[CH:31]=1)=[O:10])C1C=CC=CC=1.C(=O)(O)[O-].[Na+].CO>Br>[F:30][C:25]1[CH:26]=[CH:27][CH:28]=[CH:29][C:24]=1[C:17]1[C:16]2[CH:31]=[C:12]([NH:11][C:9]([NH:8][CH2:32][CH2:33][OH:34])=[O:10])[CH:13]=[CH:14][C:15]=2[N:21]([CH3:22])[C:20](=[O:23])[CH2:19][N:18]=1

参加物

実験手順

1.5 g (0.003 M) of 1-benzyl-1-(2-tert.butoxyethyl)-3-[5-(o-fluorophenyl)-2,3-dihydro-1-methyl-2-oxo-1H-1,4-benzodiazepin-7-yl]urea are dissolved in 15 ml of 48% aqueous hydrogen bromide solution, the mixture is heated on a steam-bath for 10 minutes, made alkaline with sodium bicarbonate, treated with a small amount of methanol and extracted three times with methylene chloride. The extracts are combined, dried over sodium sulphate, filtered and concentrated. The residue is purified in a pressure column (0.2-0.4 atmospheres of nitrogen) on 300 g of silica gel (particle size 0.04-0.06 mm) using acetone as the eluting agent and crystallised from acetone/ether. There is obtained 1-[5-(o-fluorophenyl)-2,3-dihydro-1-methyl-2-oxo-1H-1,4-benzodiazepin-7-yl]-3-(2-hydroxyethyl)urea which, according to the IR spectrum, is identical with a sample of this substance prepared in another manner (see Example 7).