4-Phenoxypiperidine → 5-Bromo-3-nitro-4-(4-phenoxypiperidin-1-yl)pyridin-2-amine

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Reaction Steps

This was prepared using the same procedure as for 2-(4-(2-amino-5-bromo-3-nitropyridin-4-yl)piperazin-1-yl)-N-(thiazol-2-yl)acetamide, but here using 5-bromo-4-chloro-3-nitropyridin-2-amine (162 mg, 0.64 mmol), DIPEA (3.5 eq, 2.24 mmol, 0.39 mL), isopropanol (3 mL) and 4-phenoxypiperidine (1.1 eq, 0.70 mmol, 125 mg). Concentration in vacuo to half volume after 18 h gave a bright yellow solid, which was filtered and washed with cold water (2×2 mL) to give the product (212 mg, 84%) as a yellow solid; δH (500 MHz, DMSO-d6) 1.74-1.81 (m, 2H, 2× piperidine CHAHB), 2.04-2.08 (m, br, 2H, 2× piperidine CHAHB), 2.98-3.03 (m, 2H, 2× piperidine NCHAHA), 3.24-3.27 (m, 2H, 2× piperidine NCHAHA), 4.63 (quintet, J=3.9 Hz, 1H, piperidine CH), 6.92 (t, J=7.4 Hz, 1H, phenyl H-6), 6.98 (s, br, 2H, NH2), 6.99 (d, J=7.8 Hz, 2H, phenyl H-2 & H-4), 7.28 (dd, J=8.6, 7.8 Hz, 2H, phenyl H-3 & H-5), 8.17 (s, 1H, pyridine H-6);

Provenance & Evidence