Reaktion #73335

Reaktionsgleichung

1-Benzyloxy-2-fluoro-3-methyl-4-nitrobenzene

N,N-dimethylformamide dimethyl acetal

→

4-fluoro-1H-indol-5-ol

Ausbeute 52.0%

Reaktionsbedingungen

Aufarbeitung

1. 1
   EinengenThe solution is then concentrated under reduced pressure
2. 2
   workup.DISSOLUTIONThe resulting residue is dissolved in THF
3. 3
   Filtrationbefore being filtered through a pad of Celite®
4. 4
   Einengenconcentrated
5. 5
   SonstigeThe residue is separated by FCC (EtOAc/heptane from 0 to 40%)

Vorschrift

1-Benzyloxy-2-fluoro-3-methyl-4-nitrobenzene (5 g, 19 mmol) is dissolved N,N-dimethylformamide dimethyl acetal (15 mL) and heated in a microwave reactor at 180° C. in a sealed vial for 1 hour. The solution is then concentrated under reduced pressure. The resulting residue is dissolved in THF and Pd/C (1.0 g, 10%, 0.95 mmol) is added. The mixture is stirred under a hydrogen atmosphere at room temperature for 16 h before being filtered through a pad of Celite® and concentrated. The residue is separated by FCC (EtOAc/heptane from 0 to 40%) to give 4-fluoro-1H-indol-5-ol (1.5 g, 52% yield). MS (ESI) m/z 152.1 (M+1); 1H NMR (400 MHz, DMSO-d6) δ ppm 11.02 (br. s., 1H), 8.79 (s, 1H), 7.26 (t, J=2.78 Hz, 1H), 7.00 (d, J=8.59 Hz, 1H), 6.75 (t, J=8.46 Hz, 1H), 6.34 (m, 1 H).

Quelle