Ethyl Acetate → 3-((R)-2-(methoxymethyl)pyrrolidine-1-carbonyl)-5-(oxazol-2-yl)benzoic acid

関与物質

反応条件

反応手順

To a solution of (R)-methyl 3-bromo-5-(2-(methoxymethyl)pyrrolidine-1-carbonyl)benzoate (Step H (1), 350 mg, 1.0 mmol) in dioxane (5 mL) were added Pd(PPh3)4 (173.5 mg, 0.15 mmol) and 2-(tributylstannyl)oxazole (1.8 g, 5.0 mmol) above made and the reaction mixture was stirred at 95° C. with sealed cap for 16 h. Ethyl acetate (200 mL) was added and the mixture was washed with H2O and concentrated under vacuum. The crude mixture was purified by silica gel Flash Chromatography (0% to 30% to 50% to 70% EtOAc/Hexane step gradient) to give 250 mg of the title compound: 1H NMR (CDCl3, 500 MHz) δ ppm 1.75-2.11 (4H, m), 3.08 (1H, brd s), 3.38 (3H, s), 3.50 (1H, m), 3.63 (2H, s), 3.83 (3H, s), 4.43 (1H, s), 7.24 (1H, s), 7.73 (1H, s), 8.22 (1H, s), 8.35 (1H, s), 8.71 (1H, s). MS (ESI) (M+H)+ 345.26.

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