反应详情

Thionyl chloride (10 mL) and 3,5-dimethoxy-4-methylbenzoic acid (1.0 g, 5.1 mmol) was refluxed under argon until no starting material was observed by TLC. After cooling reaction mixture to rt, concentrated mixture in vacuo. The resulting brown oil was added to a mixture of 2-aminophenol (580 mg, 5.3 mmol), diisopropylethyl amine (1.1 mL, 6.3 mmol) and THF (40 mL) at 0° C. and then brought to rt overnight. After concentrating mixture in vacuo, the resulting brown oil was purified by flash chromatography on silica gel, using a gradient elution from 1:9 EtOAc:hexanes to 1:1 EtOAc:hexanes. This afforded the desired intermediate, 3,5-dimethoxy-N-(2-methoxyphenyl)-4-methylbenzamide, as a colorless solid.

1. temperatureAfter cooling
2. customreaction mixture to rt
3. concentrationconcentrated mixture in vacuo
4. concentrationAfter concentrating mixture in vacuo
5. customthe resulting brown oil was purified by flash chromatography on silica gel
6. washa gradient elution from 1:9 EtOAc