Dichloromethane → 7-(4-Ethyl-5-fluoropyridin-3-yl)-6-fluoro-1-methyl-4,5-dihydro-[1,2,4]-triazolo[4,3-a]quinoline

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of 7-bromo-6-fluoro-1-methyl-4,5-dihydro-[1,2,4]triazolo[4,3-a]quinoline (146-7; 0.2 g, 0.00704 mol) and 4-ethyl-3-fluoro-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine (0.21 g, 0.0084 mol) in the mixture of 1,4-dioxan (5 mL) and water (5 mL) was added sodium carbonate (0.186 g, 0.0176 mol). Reaction mass was purged with argon for the next 20 min. Catalyst Pd(dppf)2Cl2.dichloromethane (0.28 g, 0.00352 mol) was added and again purged with argon for 10 min and allowed to stir at 100° C. for 12 h. The reaction mixture was filtered through CELITE bed and filter bed was thoroughly washed with ethyl acetate. The collected organic parts was concentrated under vacuum to afford the crude compound, which was purified by silica gel column chromatography followed by preparative HPLC (analytical conditions: column: ZORBAX XDB (150 mm×4.6 mm×3.5 μm), mobile phase (A): water, mobile phase (B): methanol, flow rate: 1.0 mL/min, gradient T/% B:0/20,8/70,25/70,27/20,30/20) to obtain title compound. 1H NMR (400 MHz, CDCl3-d6) δ 8.451 (s, 1H), 8.238 (s, 1H), 7.427-7.406 (d, J=8.4 Hz, 1H), 7.297-7.278 (d, J=7.6 Hz, 1H), 3.219-3.184 (t, J=6.4 Hz, 2H), 3.132-3.097 (t, J=7.6 Hz, 2H), 2.812 (s, 3H), 2.604-2.586 (d, J=7.2 Hz, 2H), 1.130-1.093 (t, J=7.6 Hz, 3H). MS (M+1): 327.1.

Provenance & Evidence