反应详情

温度

90 °C

A suspension of 2-formyl-4,5-dimethoxy-benzoic acid (6.43 g, 30.62 mmoles), obtained as described in example 2, triphenyl-phosphine (8.3 g, 30.62 mmoles), 30% HBr in acetic acid (8.26 ml, 30.62 mmoles) and glacial acetic acid (20 ml) under N2 was heated at 90° C. for 4.5 hours. The mixture was brought to dryness, re-dissolved in acetonitrile (50 ml) and diluted with ethyl ether up to turbidity, then cooled and filtered, and the filtrate was washed with ethyl ether and dried under vacuum to give 13.6 g of the title compound (yield: 83%).

1. customobtained
2. temperaturecooled
3. filtrationfiltered
4. washthe filtrate was washed with ethyl ether
5. customdried under vacuum