Reaktion #9193

Reaktionsgleichung

3-nitrophenol

K2CO3

NaI

→

nitrobenzene

Lösungsmittel

DMF

Reaktionsbedingungen

Aufarbeitung

1. 1
   TemperaturAfter cooling to RT
2. 2
   Filtrationthe reaction was filtered
3. 3
   Waschenthe filter cake was washed with DMF
4. 4
   SonstigeThe solvent was removed from the filtrate
5. 5
   Sonstigethe residue was chromatographed (radial chromatography
6. 6
   Waschen4 mm silica gel plate that was eluted with a step gradient of DCM containing 0, 1, 2.5, 5, 7.5% MeOH)

Vorschrift

A suspension of 3-nitrophenol (837 mg, 6.02 mmole), 1-chloro-3-[imidazo-1-yl]-propane (871 mg, 1 eq), K2CO3 (3.3 gm, 4 eq) and NaI (1.0 gm, 1.1 eq) in DMF was heated at 120° C. for 6 hr. After cooling to RT, the reaction was filtered and the filter cake was washed with DMF. The solvent was removed from the filtrate and the residue was chromatographed (radial chromatography; 4 mm silica gel plate that was eluted with a step gradient of DCM containing 0, 1, 2.5, 5, 7.5% MeOH) to afford 400 mg of 3-[3-imidazo-1-ylpropyloxy]]-nitrobenzene. This was treated with 10% palladium on charcoal (400 mg) in EtOH under a hydrogen atmosphere for 4 hr. Removal of the catalyst and the solvent left 3-[3-imidazo-1-ylpropyloxy]]-aniline was then coupled with 319A as described for 570 to afford 576 (HPLC retention time (YMC ODS S5 4.6×30 mm): 1.33 min). Beginning with 4-nitrophenol and 1-chloro-3-[imidazo-1-yl]-propane 577 (HPLC retention time (YMC ODS S5 4.6×30 mm): 1.42 min) was prepared in a similar manner as 576.

Quelle