反应详情

温度

5 °C

At 5° C., a solution of 2.5 g of potassium tert-butoxide in 25 ml of tetrahydrofuran (THF) was added dropwise to 8.2 g of ethyltriphenylphosphonium bromide dissolved in 50 ml of THF. The mixture was then stirred at 5° C. for about 10 min, and a solution of 3.9 g of 2,2-dimethoxy-1-phenylpropan-1-one from Example 1 in 10 ml of THF was added dropwise. The reaction mixture was stirred at 20 to 25° C. for 72 h and then admixed with about 300 ml of water and extracted with methyl tert-butyl ether (MTBE). The organic phases were washed with water, dried and freed of the solvent. Silica gel chromatography (MTBE/cyclohexane 1:10) of the residue gave 2.2 g of product as an isomer mixture which can be further reacted without purification.

1. stirringThe reaction mixture was stirred at 20 to 25° C. for 72 h
2. extractionextracted with methyl tert-butyl ether (MTBE)
3. washThe organic phases were washed with water
4. customdried