反应详情

Add together 7-bromo-benzofuran (300 mg, 1.50 mmol), potassium acetate (431 mg, 2 Eq.), and bis(pinacolato)diboron (390 mg, 1.6 Eq.) in DMF (30 mL) and stir for 10 minutes while degassing with nitrogen. Add [11′bis(diphenylphosphino) ferrocene]dichloro-palladium(II) (30 mg) to the reaction mixture and stir at 80° C. for 2 hours under a nitrogen atmosphere. Cool mixture to room temperature and add 4-cyano-5-ethyl-1-methyl-3-(4-trifluoromethanesulfonyloxyphenyl)-1H-pyrrole-2-carboxylic acid ethyl ester (prepared in example E-97a or E-97b) (1.3 g, 2 Eq.), 2.0M sodium carbonate/water (3.6 mL ), and [11′bis(diphenylphosphino)ferrocene]dichloro-palladium(II) (30 mg) to the mixture and heat at 80° C. overnight. Cool to room temperature and pour into water and extract the desired product into ethyl acetate. Separate layers, and wash the organic layer once with water, dry over potassium carbonate, filter, and concentrate under reduced vacuum to give 1.08 g as a dark solid. Purify the material by silica gel chromatography (Chromatotron™) eluting with hexane/ethyl acetate 7:3 to provide 275 mg of the title compound as a white solid. Mass spectrum (m/e): 399.2 (M*+1).

1. customwhile degassing with nitrogen
2. stirringAdd [11′bis(diphenylphosphino) ferrocene]dichloro-palladium(II) (30 mg) to the reaction mixture and stir at 80° C. for 2 hours under a nitrogen atmosphere
3. temperatureheat at 80° C. overnight
4. temperatureCool to room temperature
5. extractionextract the desired product into ethyl acetate
6. washSeparate layers, and wash the organic layer once with water
7. dry with materialdry over potassium carbonate
8. filtrationfilter
9. concentrationconcentrate under reduced vacuum
10. customto give 1.08 g as a dark solid
11. customPurify the material by silica gel chromatography (Chromatotron™)
12. washeluting with hexane/ethyl acetate 7:3