Isopropylamine → HCID 118159347, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 2,3-dichloropyrido[3,4-b]pyrazine (2.5 g, 12.50 mmol) and DIPEA (6.53 mL, 37.5 mmol) in DCM (25 mL) was added propan-2-amine (1.065 mL, 12.50 mmol) at 0° C. The mixture was stirred at 0° C. for 30 min, warmed slowly to 23° C., and stirred for 12 h. The crude mixture was partitioned between EtOAc (100 mL) and saturated aqueous NH4Cl (100 mL). The layers were separated and the aqueous phase was washed with EtOAc (4×100 mL). The organic extracts were combined, washed with brine (50 mL), dried over Na2SO4, filtered, rinsed with EtOAc, and dried in vacuo. The crude material was dissolved in toluene (5 mL) and purified via medium pressure chromatography using a gradient eluant of 50% to 75% EtOAc in heptane on a 80 g silica gel column (Single Step™) to give the title compound (1.828 g, 65.7%) as a yellow-orange solid. 1H NMR (400 MHz, DMSO-d6) δ ppm 1.28 (d, J=6.6 Hz, 6H), 4.39-4.49 (m, 1H), 7.49 (dd, J=5.8, 0.8 Hz, 1H), 7.73 (d, J=7.8 Hz, 1H), 8.52 (d, J=5.6 Hz, 1H), 8.95 (d, J=0.8 Hz, 1H); ESI-MS m/z [M+H]+ 223.1.

Provenance & Evidence