反应详情

3.2 Grams (12 mmol) of 5,8-dimethyl-6-bromothiochroman-4-one and 1.9 g (23 mmol) of O-methylhydroxylamine hydrochloride were refluxed in a solvent mixture of 10 ml of ethanol and 10 ml of pyridine under heat for 30 minutes. The solvent was distilled off under reduced pressure, and then 50 ml of 5% hydrochloric acid was added to form a solid. The solid was recovered by filtration, washed with water and dried to give 3.4 g of 4-methoxyimino-5,8-dimethyl-6-bromothiochroman (yield 93%).

1. temperatureunder heat for 30 minutes
2. distillationThe solvent was distilled off under reduced pressure
3. addition50 ml of 5% hydrochloric acid was added
4. customto form a solid
5. filtrationThe solid was recovered by filtration
6. washwashed with water
7. customdried