Isopropyl iodide → 2-(3,5-Bis-trifluoromethyl-phenyl)-3-methyl-butyric Acid Methyl Ester

Temperatur

0 °C

Sodium bis(trimethylsilyl) amide (1.0M in THF—177 μL) was added drop-wise to a solution of (3,5-bis-trifluoromethyl-phenyl)-acetic acid methyl ester (389 mg) in dry THF (2 mL) at 0° C., under nitrogen atmosphere. After ten minutes, isopropyl iodide (143 μL) was added and the reaction mixture was stirred at 0° C. for 30 min. Further isopropyl iodide (143 μL) was added and the solution stirred at r.t. for 1 hour. The reaction was quenched with a 2N hydrochloric acid solution (2 mL) and the product was extracted with Et2O (2×). The combined organic extracts were dried and concentrated in vacuo to a residue which was purified by flash chromatography (CH/AcOEt 95:5) to give the title compound (184 mg) as a colourless oil.

1. waitAfter ten minutes
2. stirringthe solution stirred at r.t. for 1 hour
3. customThe reaction was quenched with a 2N hydrochloric acid solution (2 mL)
4. extractionthe product was extracted with Et2O (2×)
5. customThe combined organic extracts were dried
6. concentrationconcentrated in vacuo to a residue which
7. customwas purified by flash chromatography (CH/AcOEt 95:5)

ORD-Eintrag

ord-be6c99b2b16b4f939114963e9941791e

Quelldatensatz

uspto-grants-2003_11

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06642240B2