反应详情

A 2 liter round bottom flask was charged with 15.7 grams (55 mmol) methyl-2-methoxy-5-benzamidobenzoate and 22.2 grams (55 mmol) of Lawesson's reagent followed by 500 mL of toluene. The reaction mixture was heated under reflux for 1.5 hours. The mixture was diluted with 500 mL of ethyl acetate, and washed with 250 mL of saturated aqueous bicarbonate solution, followed by washes with water and brine. The organic layer was dried over sodium sulfate, filtered and evaporated. The residue was chromatographed on silica eluting with 96/4 methylene chloride-ether. There was obtained 14.8 grams (89%) of desired material.

1. temperatureThe reaction mixture was heated
2. temperatureunder reflux for 1.5 hours
3. washwashed with 250 mL of saturated aqueous bicarbonate solution
4. dry with materialThe organic layer was dried over sodium sulfate
5. filtrationfiltered
6. customevaporated
7. customThe residue was chromatographed on silica eluting with 96/4 methylene chloride-ether