Hydrochloric Acid → 5-tert-Butyl-2-fluoro-benzaldehyde

Temperatur

-45 °C

A solution of 1-tert-butyl-4-fluoro-benzene (4.54 g, 30 mmol) in THF (100 mL) cooled at −78° C. was treated dropwise with a 2.5M solution of nBuLi in hexane (24 mL, 59 mmol). The reaction mixture was stirred for 5 h at −45° C. then DMF (3.5 mL, 44 mmol) was added at −75° C. and the reaction mixture was stirred for 0.5 h at −75° C. The reaction mixture was poured onto 1N aq. HCl and extracted with Et2O. Combined organic layers were washed with brine, dried over Na2SO4, filtered and evaporated. The title compound was obtained after chromatographic purification (Combi Flash, 40 g silica gel, hexane to hexane-EtOAc 10:1) as a light yellow oil: TLC (hexane-EtOAc 10:1) Rf=0.48, HPLC RtA=2.10 min; 1H NMR (400 MHz, CDCl3): δ10.36 (s, 1H), 7.85 (dd, 1H), 7.62 (m, 1H), 7.08 (dd, 1H), 1.32 (s, 9H).

1. stirringthe reaction mixture was stirred for 0.5 h at −75° C
2. extractionextracted with Et2O
3. washCombined organic layers were washed with brine
4. dry with materialdried over Na2SO4
5. filtrationfiltered
6. customevaporated

ORD-Eintrag

ord-4272a5c506464c4e8293a5d378306f8b

Quelldatensatz

uspto-grants-2012_01

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08093406B2