Sodium Dithionite → HCID 178419446, Verbindung

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

To a mixture of 5-bromo-3-nitro-4-(4-pyridin-4-ylmethyl-piperazin-1-yl)-pyridin-2-ylamine (0.040 g, 0.10 mmol) and EtOH (3.0 ml) was added 4-(2-morpholin-4-yl-ethoxy)-benzaldehyde (0.031 g, 0.13 mmol) with the aid of ethanol (1 ml) followed by a freshly prepared aqueous solution of Na2S2O4 (1M; 0.40 ml, 0.40 mmol). The reaction mixture was stirred at 80° C. for 20 h, then allowed to cool to room temperature and concentrated in vacuo. The resulting residue was absorbed on silica, and the free-running powder was placed on a 10 g isolute silica column. Elution with a gradient of methanol (0 to 10%) in ethyl acetate/dichloromethane (v:v; 1:1). afforded a pale yellow solid. This material was triturated with diethyl ether, and the resulting white precipitate was collected by filtration, and successively washed with diethyl ether, water, and diethyl ether, then dried in vacuo (0.014 g, 24%); 1H-NMR (500 MHz, DMSO-d6) 2.63 (br s, 4H, piperazine N(CH2)2), 2.72 (t, J=5.7 Hz, 2H, OCH2CH2N), 3.59 (t, J=4.7 Hz, 4H, morpholine O(CH2)2), 3.62, (s, 2H, NCH2-pyridyl), 3.68 (br t, 4H, piperazine N(CH2)2), 4.18 (t, J=5.8 Hz, 2H, OCH2CH2N), 7.11 (d, J=8.9 Hz, 2H) and 8.12 (d, J=8.9 Hz, 2H) (3,5-C6H4— and 2,6-C6H4—), 7.39 (d, J=5.9 Hz, 2H, pyridine 3-H, 5-H), 8.20 (s, 1H, imidazo[4,5-b]pyridine 5-H), 8.54 (d, J=5.9 Hz, 2H, pyridine 2-H, 6-H), 13.34 (br s, 1H, imidazo[4,5-b]pyridine N—H);

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