反应详情

6.84 g of methyl 4-chloro-3-hydroxy-5-nitro-benzoate were dissolved in acetone (150 ml), treated at RT in succession with 10.19 g of potassium carbonate and 11.19 g of 2-(2-iodo-ethoxy)-tetrahydro-pyran and the mixture was heated at reflux for 16 hours. Subsequently, the mixture was poured into water, extracted with ethyl acetate, the organic phase was dried over sodium sulphate and concentrated on a rotary evaporator. The residue was flash chromatographed on silica gel with hexane/ether (2/1) as the eluent. There was thus obtained the desired methyl 4-chloro-3-nitro-5-[2-(tetrahydro-pyran-2-yloxy)-ethoxy]-benzoate as as a pale yellow solid.

1. temperaturethe mixture was heated
2. temperatureat reflux for 16 hours
3. extractionextracted with ethyl acetate
4. dry with materialthe organic phase was dried over sodium sulphate
5. concentrationconcentrated on a rotary evaporator
6. customchromatographed on silica gel with hexane/ether (2/1) as the eluent