反应详情

温度

0 °C

0.8 g (5.8 mmols) of bicyclo[3.2.1]octan-2,4-dione (the preparation thereof is described for example in U.S. Pat. No. 5,608,101 and in the references cited therein) are dissolved in 15 ml of methylene chloride at 20° C. The solution is mixed with 0.97 ml of triethylamine and cooled to a temperature of 0° C. Then, a solution of 1.6 g (5.8 mmols) of 4-methylsulphonyl-3-methoxymethyl-2-methylbenzoic acid chloride in 10 ml of methylene chloride is added dropwise. The reaction mixture is stirred for half an hour at a temperature of 0° C. and is subsequently diluted with methylene chloride. After washing and drying, the organic phase is concentrated by evaporation. 2.23 g of 4-methylsulphonyl-3-methoxymethyl-2-methylbenzoic acid-4-oxo-bicyclo[3.2.1]oct-2-en-2-yl-ester is obtained in amorphous form. This can be used for the next step without purification.

1. washAfter washing
2. customdrying
3. concentrationthe organic phase is concentrated by evaporation