Water → Methyl 3-(2-phenoxyethoxy)-6-(1,2,3,4-tetrahydroquinolin-7-yl)picolinate

Participants

Reaction Steps

Methyl 6-bromo-3-(2-phenoxyethoxy)picolinate (27A) (327 mg, 0.93 mmol), 7-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,2,3,4-tetrahydroquinoline (27B) (181 mg, 0.7 mmol), tetrabutylammonium bromide (30 mg, 0.09 mmol), dichlorobis(triphenylphosphine)palladium(II) (26 mg, 0.04 mmol) and K2CO3 (322 mg, 2.33 mmol) were stirred in 1,4-dioxane (2 mL) and water (1 mL) at 90° C. for 45 minutes. The reaction mixture was allowed to cool to rt and diluted with EtOAc (5 ml), washed with H2O, dried over MgSO4, filtered, and concentrated under reduced pressure. The crude material was purified by column chromatography on silica gel eluting with a gradient of PE/EtOAc 9:1-7:3, to provide 205 mg (72%) of the desired product methyl 3-(2-phenoxyethoxy)-6-(1,2,3,4-tetrahydroquinolin-7-yl)picolinate (27C): 1H NMR (300 MHz, CDCl3) δ7.69 (1H, m), 7.44 (1H, m), 7.27 (2H, m), 7.13 (2H, s), 6.94 (4H, m), 4.40 (2H, m), 4.34 (2H, m), 3.90 (3H, s), 3.27 (2H, t), 2.76 (2H, t), 1.92 (2H, m).

Provenance & Evidence