反应详情

A solution of 3-[(trifluoroacetyl)amino]succinic anhydride (4.00 g, 19.0 mmol) and aluminum chloride (5.56 g, 41.7 mmol) in benzene (80 mL) was refluxed for 5 h, then cooled in an ice bath and quenched by the slow addition of water. The reaction mixture was worked up with ethyl acetate and 10% hydrochloric acid. The residue was purified by chromatography (silica gel, 100% methylene chloride to 90/10/1/1 methylene chloride/methanol/acetic acid/water gradient elution). Recrystallization of the resulting oil from methylene chloride/hexanes produced the title compound as a white solid (3.00 g). 1H NMR (500 MHz, (d6-acetone) □ 11.56 (bs, 1H), 8.63 (bs, 1H), 8.06 (dd, J=8.3, 1.2 Hz, 2H), 7.70-7.67 (m, 1H), 7.57 (t, J=7.7 Hz, 2H), 5.14-5.10 (m, 1H), 3.84 (dd, J=18.3, 6.8 Hz, 1H), 3.77 (dd, J=18.1, 4.6 Hz, 1H).

1. temperaturecooled in an ice bath
2. customquenched by the slow addition of water
3. customThe residue was purified by chromatography (silica gel, 100% methylene chloride to 90/10/1/1 methylene chloride/methanol/acetic acid/water gradient elution)
4. customRecrystallization of the resulting oil from methylene chloride/hexanes