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

Reaktionsgleichung

[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

Komponenten

Reaktionsbedingungen

Temperatur: 70 °C

Versuchsvorschrift

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);

Aufarbeitung

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

Quellen und Nachweise

ORD-Eintrag: ord-142d71860b9743e584fe5f570a1ce451
Quelldatensatz: uspto-grants-2012_01
DOI: 10.6084/m9.figshare.5104873.v1
Patentnummer: US08088761B2

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