Potassium Carbonate → Tert-butyl 4-(6-(2-amino-5-bromonicotinoyl)pyridin-2-yl)-1,4-diazepane-1-carboxylate

Participants

Reaction Conditions

Reaction Steps

A mixture of (2-amino-5-bromopyridin-3-yl)(6-bromopyridin-2-yl)methanone (6.0 g, 16.8 mmol), 1-Boc-homopiperazine (3.64 ml, 18.48 mmol) and K2CO3 (8.13 g, 58.8 mmol) in DMF (50 ml) was heated at 95° C. for 17 hours. Additional 1-Boc-homopiperazine (0.3 ml, 0.1 eq) was added and the mixture heated at 95° C. for a further 4 hours for reaction to go to completion. Reaction mixture was then allowed to cool to room temperature and solvent removed in vacuo. The resulting solid was slurried in EtOAc and filtered through a short pad of silica, washing through with EtOAc and the resulting filtrate was then concentrated to dryness in vacuo. The crude product was purified by flash chromatography on silica (5 to 25% EtOAc/Petrol) to give pure title compound as a yellow solid (2.94 g, 37%). 1H NMR (DMSO-d6) (quoted as a mixture of rotamers) 1.25 (9H, d), 1.91-1.77 (2H, m), 3.34 (2H, masked signal), 3.57-3.50 (2H, m), 3.65-3.62 (2H, m), 3.77-3.70 (2H, m), 6.95 (1H, dd), 7.12 (1H, dd), 7.75-7.69 (1H, m), 7.80 (2H, br s), 8.32 (1H, d), 8.60 (1H, dd). ES+ 477.98.

Provenance & Evidence