Phosphorus oxychloride → HCID 178506089, Verbindung

Beteiligte Stoffe

Reaktionsschritte

Reflux 5-trifluoromethyl-1,3-dihydro-benzimidazol-2-one (17 g; Meanwell et al. (1995) J. Org. Chem. 60(6):1565-1582) for 14 hours in POCl3 (200 mL). Evaporate the solvent in vacuo, then carefully neutralize with saturated NaHCO3, and extract with EtOAc. Dry over Na2SO4, concentrate under vacuum, and purify by flash chromatography (1:1 hexanes/EtOAc) to obtain 2-chloro-5-trifluoromethyl-1H-benzimidazole. B. 1′-(5-Trifluoromethyl-1H-benzimidazol-2-yl)-spiro[isobenzofuran-1,4′-piperidin]-3-one hydrochloride

Herkunft & Nachweise