反应详情

A solution of 2-fluoro-4-(3-hydroxy)propyl-1-triphenylmethylimidazole (386 mg. in dry pyridine (2 ml.) and acetyl chloride (78.5 μl.) was heated with stirring at 85° for 100 minutes. The solution was poured into water (25 ml.) and the mixture extracted with CH2Cl2 (3×15 ml.). The extract was washed with water and brine, dried (MgSO4), filtered, evaporated, and the residue azeotroped with toluene. The resulting orange oil was purified by column chromatography on silica gel eluting with CH2Cl2 /MeOH 100:0 to 98:2 v/v to give 4-(3-acetoxy)propyl-2-fluoro-1-triphenylmethylimidazole (127 mg.) having the following n.m.r. in CDCl3 : 1.9 (m, 2H); 2.02 (s, 3H); 2.47 (t, 2H); 4.07 (t, 2H) 6.22 (s, 1H); 7.0-7.5 (m, 15H).

1. extractionthe mixture extracted with CH2Cl2 (3×15 ml.)
2. washThe extract was washed with water and brine
3. dry with materialdried (MgSO4)
4. filtrationfiltered
5. customevaporated
6. customthe residue azeotroped with toluene
7. customThe resulting orange oil was purified by column chromatography on silica gel eluting with CH2Cl2 /MeOH 100:0 to 98:2 v/v