反应详情

In 5 ml of methylene chloride was dissolved 0.2 ml of oxalyl chloride and at a constant temperature between -50° C. and -60° C., a solution prepared by dissolving 0.34 ml of dimethyl sulfoxide in 1 ml of methylene chloride was added dropwise. The mixture was stirred for 2 minutes, after which a solution of 0.54 g of 6-cyano-3,4-dihydro-2,2-dimethyl-4-(2-hydroxycyclopentan-1-yl)-2H-1,4-benzoxazine in 2 ml of methylene chloride was added dropwise. The mixture was further stirred for 15 minutes and 0.7 ml of triethylamine was added. The mixture was stirred for an additional 5 minutes, after which it was allowed to return to room temperature. The reaction mixture was diluted with 10 ml of water and extracted with methylene chloride. The extract was washed with aqueous sodium chloride solution and dried over anhydrous magnesium sulfate and the solvent was distilled off under reduced pressure. The residue was recovered by filtration, washed with ethanol and recrystallized from ethyl acetate to give 0.28 g of 6-cyano-3,4-dihydro-2,2-dimethyl-4(2-oxocyclopentyl)-2H-1,4-benzoxazine.

1. customat a constant temperature between -50° C. and -60° C., a solution prepared
2. additionwas added dropwise
3. stirringThe mixture was further stirred for 15 minutes
4. stirringThe mixture was stirred for an additional 5 minutes
5. customto return to room temperature
6. extractionextracted with methylene chloride
7. washThe extract was washed with aqueous sodium chloride solution
8. dry with materialdried over anhydrous magnesium sulfate
9. distillationthe solvent was distilled off under reduced pressure
10. filtrationThe residue was recovered by filtration
11. washwashed with ethanol
12. customrecrystallized from ethyl acetate