Potassium Carbonate → HCID 59418747, compound

Participants

Reaction Conditions

Reaction Steps

To 7-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,2,3,4-tetrahydroquinoline (27B) (1.16 g, 4.48 mmol), methyl 3-(benzyloxy)-6-bromopicolinate (29A) (1.44 g, 4.48 mmol), K2CO3 (1.546 g, 11.2 mmol), tetrabutylammonium bromide (0.144 g, 0.45 mmol), and dichlorobis(triphenylphosphine)palladium(II) (126 mg, 0.18 mmol) was added 1,4-dioxane (30 mL) and water (15 mL). The reaction mixture was heated to 90° C. for 1.5 hours, cooled to rt, concentrated, diluted with EtOAc, washed sequentially with water, brine, dried over MgSO4, filtered, and concentrated under reduced pressure. The crude material was precipitated from EtOAc/PE to provide the product methyl 3-(benzyloxy)-6-(1,2,3,4-tetrahydroquinolin-7-yl)picolinate (29B). Additional material was isolated from the filtrate by column chromatography on silica gel eluting with a gradient of PE:EtOAc 73:27-63:37, to provide the desired product (29B): 1H NMR (300 MHz, CDCl3) δ7.67 (1H, d), 7.48-7.44 (2H, m), 7.43-7.31 (4H, m), 7.21 (1H, d), 7.16 (1H, dd), 7.01 (1H, d) 5.21 (2H, s), 3.98 (3H, s), 3.34 (2H, m), 2.79 (2H, t), 1.96 (2H, m).

Provenance & Evidence