Cesium carbonate → Methyl 2-{[3'-fluoro-4'-(formylamino)-1,1'-biphenyl-4-yl]carbonyl}cyclopentanecarboxylate

温度

80 °C

To a suspension of 2-fluoro-4-iodophenylformamide (5.11 g, 19.28 mmol) bis(pinacolato)diboron (4.89 g, 19.28 mmol), potassium acetate (5.67 g, 57.84 mmol), and palladium acetate (129 mg, 0.58 mmol) in N,N-dimethylformamide (125 mL) was bubbled through argon for 30 minutes. The reaction mixture was then heated at 80° C. for 3 h. After the mixture was cooled to rt, methyl (R,R)-2-(4-bromobenzoyl)cyclopentanecarboxylate (2.2 g, 7.35 mmol, 97% ee), tetrakis(triphenylphosphine)palladium(0) (668 mg, 0.58 mmol), and cesium carbonate (9.43 g, 28.92 mmol) were added, and the reaction mixture was then heated at 80° C. for 16 h. The mixture was then cooled to rt, quenched with water, extracted with ethyl acetate, and dried over anhydrous sodium sulfate. Solvent was then removed under reduced pressure and the crude product was purified by flash chromatography (Biotage 75) using 1:1 ethylacetate/hexane to afford methyl 2-{[3′-fluoro-4′-(formylamino)-1,1′-biphenyl-4-yl]carbonyl}cyclopentanecarboxylate (4.6 g, 65%). LC-MS ret. time 3.15 min, m/z 342.0 (MH+); 1H NMR (300 MHz, DMSO-d6) δ 1.52–1.94 (m, 1H), 1.92–2.07 (m, 1H), 2.10–2.21 (m, 1H), 3.48 (m, 1H), 3.55 (s, 3H), 4.12 (q, 1H), 7.59 (dd, 1H), 7.62 (dd, 1H), 7.87 (d, 2H), 8.09 (d, 2H), 8.25 (t, 1H), 8.34 (s, 1H), 10.62 (s, 1H).

1. customwas bubbled through argon for 30 minutes
2. temperatureAfter the mixture was cooled to rt
3. temperaturethe reaction mixture was then heated at 80° C. for 16 h
4. temperatureThe mixture was then cooled to rt
5. customquenched with water
6. extractionextracted with ethyl acetate
7. dry with materialdried over anhydrous sodium sulfate
8. customSolvent was then removed under reduced pressure
9. customthe crude product was purified by flash chromatography (Biotage 75)

ORDレコード

ord-4206c7f805fd4769a8114cbbd699fa8a

出典データセット

uspto-grants-2006_08

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US07091228B2