反应详情

A solution of methyl 2-amino-6-chlorobenzoate (3.00 g, 16.2 mM) and dimethyl acetylenedicarboxylate (2.64 g, 18.6 mM) in t-butanol (25 mL) was refluxed under a nitrogen atmosphere for 18 hr. The reaction mixture was cooled to room temperature and potassium t-butoxide (2.09 g, 18.6 mM) was added in one portion whereupon a precipitate formed. After refluxing this mixture for 1.5 hr, it was cooled to room temperature and filtered to separate the solids. The solids were dissolved in rarer and the resulting solution acidified with 1N H2SO4 to form a precipitate. The mixture was filtered and the collected solids were washed with water and air dried to give dimethyl 5-chloro-4-hydroxyquinoline-2,3-dicarboxylate (3.84 g, 80.2%) as a tan solid. An 0.25 g portion of this material was recrystallized from ethyl acetate to provide an analytical sample (0.152 g) of the title compound as an off-white solid, mp 174°-176° C.; MS(CI): 296 (M+H). Analysis for C13H10ClNO5.0.01 H2O: Calculated: C, 52.78; H, 3.41; N, 4.73 Found: C, 52.39; H, 3.38; N, 4.67

1. customformed
2. temperatureAfter refluxing this mixture for 1.5 hr
3. temperatureit was cooled to room temperature
4. filtrationfiltered
5. customto separate the solids
6. dissolutionThe solids were dissolved in rarer and the resulting solution
7. customto form a precipitate
8. filtrationThe mixture was filtered
9. washthe collected solids were washed with water and air
10. customdried