反应详情

1-[3-Bromo-5-(pentafluorosulfanyl)phenyl]ethanone (835 mg, example 26c) was dissolved in methanol (50 ml), and admixed at RT with DL-10-camphorsulfonic acid (0.9 mg) and with trimethyl orthoformate (0.85 ml). The reaction mixture was stirred at RT for 2 h and then stood overnight. Then the mixture was stirred at RT for a further 5 h. Subsequently, saturated sodium hydrogencarbonate solution was used to adjust the pH to 9, and a large amount of EA and water were added. The organic phase was removed and the aqueous phase was extracted five times with EA. The combined EA phases were dried over magnesium sulfate, filtered and concentrated. 900 mg of the title compound were obtained.

1. waitstood overnight
2. stirringThen the mixture was stirred at RT for a further 5 h
3. customThe organic phase was removed
4. extractionthe aqueous phase was extracted five times with EA
5. dry with materialThe combined EA phases were dried over magnesium sulfate
6. filtrationfiltered
7. concentrationconcentrated