反应详情

Excess triethylamine (2 mL) was added to a suspension of 2,4,6-trimethoxyaniline hydrochloride (1.6 g, 7.3 mmol) in 500 mL THF and stirred for 1 hour before filtering to remove triethylamine hydrochloride. The filtrate was concentrated and redissolved in 500 mL dichloromethane along with (±)-4-dodecyl-α-phenyl-1H-imidazole-1-acetic acid (2.45 g, 6.6 mmol) at 0° C. Dicyclohexylcarbodiimide (1.43 g, 6.9 mmol) was added in one portion and the resulting suspension was warmed to room temperature and stirred for 16 hours. Filtered to remove a white solid and partitioned the filtrate between dichloromethane and 1N HCl. The organic layer was washed with 1N NaOH, dried over MgSO4, filtered, and concentrated. The resulting residue was chromatographed (20% EtOAc/hexanes on silica) to give the title compound as a white solid (1.25 g, 35%); mp 95°-102° C.

1. filtrationbefore filtering
2. customto remove triethylamine hydrochloride
3. concentrationThe filtrate was concentrated
4. stirringstirred for 16 hours
5. filtrationFiltered
6. customto remove a white solid
7. custompartitioned the filtrate between dichloromethane and 1N HCl
8. washThe organic layer was washed with 1N NaOH
9. dry with materialdried over MgSO4
10. filtrationfiltered
11. concentrationconcentrated
12. customThe resulting residue was chromatographed (20% EtOAc/hexanes on silica)