Sodium Carbonate → 5-(6-Morpholino-1,5-naphthyridin-3-yl)benzo[d]oxazol-2-amine

Participants

Reaction Steps

A mixture of 7-bromo-2-morpholino-1,5-naphthyridine (F-32) (180 mg, 0.6 mmol, 1.0 eq), 2-aminobenzo[d]oxazol-5-ylboronic acid (131 mg, 0.73 mmol, 1.2 eq), Pd(PPh3)4 (71 mg, 0.06 mmol, 0.1 eq), and Na2CO3 (195 mg, 1.8 mmol, 3.0 eq) were dissolved in a mixture of 1,4-dioxane (10 mL) and water (10 mL). The resulting mixture was degassed and back-filled with argon three times and heated at reflux under an argon atmosphere for 2 h. The reaction was complete based on TLC analysis. The mixture was concentrated in vacuo and the residue was purified by column chromatography on silica gel (3-5% MeOH-DCM) to afford 5-(6-morpholino-1,5-naphthyridin-3-yl)benzo[d]oxazol-2-amine (73) (140 mg, 67.2% yield). 1H NMR (400 MHz, DMSO-d6) δ: 8.93 (s, 1H), 8.10 (m, 2H), 7.66 (s, 1H), 7.53 (s, 2H), 7.45 (m, 3H), 3.74 (m, 8H); ESI-MS m/z: 348.11 [M+H]+.

Provenance & Evidence