反应详情

Tetrahydrophthalic anhydride (0.58 g, 0.0039 mole), and 4-chloro-5-ethoxymethyl-2-fluoroaniline in glacial acetic acid from Step C was heated at 100° C. overnight. Acetic acid was removed under reduced pressure. The residue was dissolved in ethyl acetate (100 ml) and washed successively with a saturated aqueous solution of sodium bicarbonate (5×50 ml) and a 10% aqueous solution of hydrochloric acid. The dried (magnesium sulfate) organic layer was concentrated under reduced pressure. The residue was passed through a column of silica gel eluting with ethyl acetate:heptane (3:17). Appropriate fractions were combined and concentrated under reduced pressure yielding N-[4-chloro-2-fluoro-5-ethoxymethylphenyl]-3,4,5,6-tetrahydrophthalimide as an amber solid, m.p. 89°-91° C. The nmr spectrum was consistent for the proposed structure.

1. customAcetic acid was removed under reduced pressure
2. dissolutionThe residue was dissolved in ethyl acetate (100 ml)
3. washwashed successively with a saturated aqueous solution of sodium bicarbonate (5×50 ml)
4. dry with materialThe dried (magnesium sulfate) organic layer
5. concentrationwas concentrated under reduced pressure
6. concentrationconcentrated under reduced pressure