Sodium Carbonate → HCID 44176975, compound

Participants

Reaction Steps

A mixture of benzothiazol-5-yl-(6-chloro-pyrazin-2-yl)-amine (0.06 g, 0.228 mmol), pyridine-4-boronic acid (0.043 g, 0.342 mmol), sodium carbonate (0.124 g, 1.14 mmol) and tetrakis(triphenylphosphine)palladium(0) (0.013 g, 0.0114 mmol) in DME:water (3:2, 5 mL) was heated at reflux for 22 h. The reaction mixture was concentrated under reduced pressure and the residue obtained was extracted with dichloromethane. The organic layer was washed with water, brine, dried over sodium sulfate and concentrated. The crude product was purified by flash chromatography (5% methanol in CH2Cl2 as eluent) to yield N-(6-pyridin-4-ylpyrazin-2-yl)-1,3-benzothiazol-5-amine (0.035 g, 50%) as a yellow solid. 1H NMR (CD3OD) δ 9.31 (s, 1H), 8.98 (d, J=2.02 Hz, 1H), 8.75-8.74 (d, J=5.31 Hz, 2H), 8.64 (s, 1H), 8.31 (s, 1H), 8.24-8.22 (d, J=5.99 Hz, 2H), 8.06-8.04 (d, J=8.77 Hz, 1H), 7.74-7.71 (dd, J=10.73, 2.01 Hz, 1H); MS (API-ES/Positive); m/z: 306 (M+H)+.

Provenance & Evidence