反应详情

The well-dried compound (18) (2.1 g) was dissolved in benzene (150 ml), and then trichloroacetic acid (0.4 g) was added. The mixture was heated under reflux for 2 hours on an oil bath. The reaction mixture was cooled to room temperature, and then passed through a column of alumina. From the eluted solution the solvent was distilled off to obtain the crude product (19), at a yield of 1.02 g. The crude product was purified on an alumina (20 g) column, eluting with hexane, to obtain the product (19) at a yield of 725 mg (91.2%) as a blue oily substance.

1. temperatureThe mixture was heated
2. temperatureunder reflux for 2 hours on an oil bath
3. distillationFrom the eluted solution the solvent was distilled off