反应详情

To an ice-cooled suspension of 26.0 g 5,6-dihydro-5-oxo-2-[3-(trifluoromethyl)phenyl]-N-[4-(trifluoromethyl)-phenyl]-4H-1,3,4-oxadiazine-4-carboxamide (prepared in B above) in 300 ml dichloromethane and 300 ml methanol was added 2.3 g sodium borohydride in portions. The resultant mixture was stirred for 45 min and then quenched with 200 ml 1M HCl and diluted with 1 l dichloromethane. The phases were separated and the organic phase was washed with 200 ml 1 M HCl and 100 ml saturated sodium bicarbonate, dried over sodium sulfate and concentrated under vacuum to give 5,6-dihydro-5-hydroxy-2-[3-(trifluoromethyl)phenyl]-N-[4-(trifluoro-methyl)phenyl]-4H-1,3,4-oxadiazine-4-carboxamide. The structure was confirmed by 1H NMR.

1. customquenched with 200 ml 1M HCl
2. additiondiluted with 1 l dichloromethane
3. customThe phases were separated
4. washthe organic phase was washed with 200 ml 1 M HCl and 100 ml saturated sodium bicarbonate
5. dry with materialdried over sodium sulfate
6. concentrationconcentrated under vacuum