반응 #49227

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(R)-methyl 3-bromo-5-(2-(methoxymethyl)pyrrolidine-1-carbonyl)benzoate

2-(tributylstannyl)oxazole

Ethyl acetate

→

title compound

수율 75.7%

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

수율 75.7%

용매

dioxane

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후처리

1. 1
   기타with sealed
2. 2
   기타cap for 16 h
3. 3
   세척the mixture was washed with H2O
4. 4
   농축concentrated under vacuum
5. 5
   기타The crude mixture was purified by silica gel Flash Chromatography (0% to 30% to 50% to 70% EtOAc/Hexane step gradient)

실험 절차

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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