Hydrochloric Acid → 5-Iodo-2-[2-(5-methyl-2-phenyl-4-oxazolyl)ethoxy]pyridine

Participants

Reaction Conditions

Reaction Steps

To a mixture of 5-amino-2-[2-(5-methyl-2-phenyl-4-oxazolyl)ethoxy]pyridine (10.0 g), conc. HCl (8.47 ml) and acetone (100 ml) was added dropwise a solution of sodium nitrite (NaNO2) (2.46 g) in water (10 ml) at temperatures below 10° C. The mixture was stirred for 30 minutes at 10° C, to which was dropwise added a solution of potassium iodide (KI) (2.46 g) in water (10 ml) at 10° C. The reaction mixture was stirred for further one hour at temperatures raging from 30° to 35° C. and for another one hour at temperatures ranging from 35° to 40° C., followed by concentration under reduced pressure. The concentrate was poured into water, which was subjected to extraction with ethyl acetate. The ethyl acetate layer was washed with water and dried (MgSO4), then the solvent was distilled off under reduced pressure. The residual oily product was subjected to a silica gel chromatography. From the fractions eluted with ethyl acetate--hexane (1:3, v/v) was obtained 5-iodo-2-[2-(5-methyl-2-phenyl-4-oxazolyl)ethoxy]pyridine (7.22 g, 52%). Recrystallization from ethyl acetate--hexane gave colorless crystals, m.p.105°-106° C.

Provenance & Evidence