4-Benzylpiperidine → 4-(4-Benzylpiperidin-1-yl)-5-bromo-3-nitropyridin-2-amine

Participants

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 (1.00 g, 3.96 mmol), DIPEA (3.5 eq, 13.86 mmol, 2.41 mL), isopropanol (20 mL) and 4-benzylpiperidine (1.1 eq, 4.36 mmol, 0.77 mL). Concentration in vacuo to half volume after 18 h gave a bright yellow solid, which was filtered and washed with cold water (2×5 mL) to give the product (1.12 g, 72%) as a yellow solid; δH (500 MHz, DMSO-d6) 1.38 (qd, br, J=12.2, 3.5 Hz, 2H, 2× piperidine CHAHB), 1.60 (d, br, J=10.9 Hz, 2H, 2× piperidine CHAHB), 1.69-1.76 (m, 1H, piperidine CH), 2.55 (d, J=7.1 Hz, 2H, 2× piperidine NCHAHA), 2.74 (t, br, J=11.9 Hz, 2H, 2× piperidine NCHAHA), 3.22 (d, br, J=12.5 Hz, 2H, PhCH2), 6.93 (s, br, 2H, NH2), 7.16-7.18 (1H, m, phenyl H-4), 7.19 (d, J=7.4 Hz, 2H, phenyl H-2 & H-6), 7.28 (t, J=7.1 Hz, 2H, phenyl H-3 & H-5), 8.13 (s, 1H, pyridine H-6);

Provenance & Evidence