反应详情

A solution of 10.2 grams (33 mmol) of 4-n-butylamino-1-cyclohexyloxy-2,2,6,6-tetramethylpiperidine (prepared in Example 8), 3.3 grams (33 mmol) of triethylamine, and 30 ml of tetrahydrofuran is added to a solution of 3.0 grams (30 mmol) of succinic anhydride in 20 ml of tetrahydrofuran over a 5-minute period. The reaction mixture is stirred for six hours and then diluted with ethyl acetate (200 ml). The organic solution is washed with 1N hydrochloric acid (2×50 ml), washed with water (50 ml), washed with saturated sodium chloride solution (50 ml), dried over anhydrous magnesium sulfate and concentrated under reduced pressure to give an oil which crystallizes on standing. Recrystallization from heptane affords 5.6 grams (46% yield) of the title compound as a white solid melting at 110°-113° C.

1. washThe organic solution is washed with 1N hydrochloric acid (2×50 ml)
2. washwashed with water (50 ml)
3. washwashed with saturated sodium chloride solution (50 ml)
4. dry with materialdried over anhydrous magnesium sulfate
5. concentrationconcentrated under reduced pressure
6. customto give an oil which
7. customcrystallizes
8. customRecrystallization from heptane