4-(Dimethylamino)Benzaldehyde → 4-(6-Bromo-7-(4-(pyridin-3-ylmethyl)piperazin-1-yl)-3H-imidazo[4,5-b]pyridin-2-yl)-N,N-dimethylaniline

HRID 416737

Reaction equation

[Br:1][C:2]1[C:3]([N:12]2[CH2:17][CH2:16][N:15]([CH2:18][C:19]3[CH:20]=[N:21][CH:22]=[CH:23][CH:24]=3)[CH2:14][CH2:13]2)=[C:4]([N+:9]([O-])=O)[C:5]([NH2:8])=[N:6][CH:7]=1.[CH3:25][N:26]([CH3:35])[C:27]1[CH:34]=[CH:33][C:30]([CH:31]=O)=[CH:29][CH:28]=1.[O-]S(S([O-])=O)=O.[Na+].[Na+]>C(O)C>[Br:1][C:2]1[C:3]([N:12]2[CH2:17][CH2:16][N:15]([CH2:18][C:19]3[CH:20]=[N:21][CH:22]=[CH:23][CH:24]=3)[CH2:14][CH2:13]2)=[C:4]2[N:9]=[C:31]([C:30]3[CH:33]=[CH:34][C:27]([N:26]([CH3:35])[CH3:25])=[CH:28][CH:29]=3)[NH:8][C:5]2=[N:6][CH:7]=1

Participants

Conditions

Temperature: 70 °C

Procedure

To a mixture of 5-bromo-3-nitro-4-(4-(pyridin-3-ylmethyl)piperazin-1-yl)pyridin-2-amine (0.043 g, 0.11 mmol), ethanol (4 ml), and 4-dimethylaminobenzaldehyde (0.021 g, 0.14 mmol) was added a freshly prepared aqueous solution of Na2S2O4 (1M; 0.44 ml, 0.44 mmol). The reaction mixture was heated at 70° C. for 3.5 h, then allowed to cool to room temperature and the solvents were removed in vacuo. The residue was absorbed on silica gel and the free running powder was placed on a 10 g isolute silica column which was eluted with 90% ethyl acetate in dichloromethane and then 3% and 5% methanol in ethyl acetate. The title compound was obtained as a pale yellow solid after trituration with diethyl ether (0.012 g, 22%); 1H-NMR (500 MHz, DMSO-d6) 2.61 (br s, 4H, piperazine N(CH2)2), 3.00 (s, 6H, N(CH3)2), 3.61 (s, 2H, NCH2CO), 3.63 (br s, 4H, piperazine N(CH2)2), 6.81 (d, J=9.00 Hz, 2H) and 8.01 (d, J=8.80 Hz, 2H) (3,5-C6H4NMe2 and 2,6-C6H4—NMe2), 7.40 (dd, J=7.06, 3.92 Hz, 1H, pyridyl 5-H), 7.78 (d, J=8.64 Hz, 1H, pyridyl 4-H), 8.15 (s, 1H, imidazo[4,5-b]pyridine 5-H), 8.50 (dd, J=4.75, 1.50 Hz, 1H, pyridyl 6-H), 8.56 (d, J=1.50 Hz, 1H, pyridyl 2-H), 13.15 (s, 1H, imidazo[4,5-b]pyridine N—H);

Workup

temperatureto cool to room temperature
customthe solvents were removed in vacuo
customThe residue was absorbed on silica gel
washwas eluted with 90% ethyl acetate in dichloromethane

Sources & evidence

ORD record: ord-142d71860b9743e584fe5f570a1ce451
Source dataset: uspto-grants-2012_01
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08088761B2

Linked notes

Loading…