Dimethyl Sulfoxide → HCID 178521578, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of 6-(5-chloro-2-fluoropyridin-4-yl)-N-((tetrahydro-2H-pyran-4-yl)methyl)pyrazin-2-amine (375 mg, 1.162 mmol), DMSO (3.5 ml) and trans-4-aminocyclohexanol (1204 mg, 10.46 mmol) was stirred at 100° C. for 18 hours and the progress was followed by LCMS. The reaction mixture was let cool, added 300 ml of ethyl acetate, washed with saturated sodium bicarbonate solution (3×), water (2×), saturated salt solution (1×), dried with sodium sulfate, filtered and concentrated to crude solid. The crude material was purified by silica gel chromatography using 40 g column, eluting slowly from (80%> ethyl acetate 20% heptane with 2% MeOH) to 100% ethyl acetate with 2% MeOH. The desired fractions are concentrated to a constant mass, lyophilized from 1:1 ACN/water (does not fully dissolve), re-lyophilized from 80 ml of (60/40) ACN/water solution with sonicating to dissolve solid, giving 270 mg of title compound as free base. LCMS (m/z): 418.3 (MH+), retention time=0.52 min.; 1H NMR (300 MHz, METHANOL-d4, 25° C.) δ ppm 1.19-1.55 (m, 6H) 1.71 (d, J=12.89 Hz, 2H) 1.85-2.15 (m, 5 H) 3.28-3.32 (dMeOH, 2H App.) 3.40 (td, J=11.72, 1.76 Hz, 2H) 3.50-3.73 (m, 2H) 3.94 (dd, J=11.28, 3.08 Hz, 2 H) 6.66 (s, 1 H) 7.86 (s, 2H) 7.99 (s, 1 H)

Provenance & Evidence