反应详情

A solution of 23.72 g of diethyl 2-(5-methyl-3-isoxazolyloxy)malonate (prepared as described in Preparation 19) in 120 ml of tetrahydrofuran was added dropwise to a suspension of 14.00 g of lithium aluminum hydride in 140 ml of tetrahydrofuran over a period of 30 minutes, whilst ice-cooling. The mixture was stirred at room temperature for 40 hours, after which 56 ml of a 4% w/v aqueous solution of sodium hydroxide was added dropwise to it over a period of 30 minutes, whilst ice-cooling. An insoluble material was filtered off using a Celite (trade mark) filter aid, and the filtrate was concentrated by evaporation under reduced pressure. The residue was subjected to column chromatography through 300 g of silica gel. 11.26 g of the title compound was isolated as a colorless oil from the fractions eluted with ethyl acetate.

1. temperaturecooling
2. temperaturecooling
3. filtrationAn insoluble material was filtered off
4. filtrationfilter aid
5. concentrationthe filtrate was concentrated by evaporation under reduced pressure