反应详情

Methyl 1,4-dioxaspiro[4,5]dec-7-ene-8-carboxylate [J. Org. Chem. 40, 538 (1975)] (1.00 g, 5.0 mmol) was stirred under Ar in dry THF (50 ml) at -78° C. as diisobutylaluminium hydride (1.5M in toluene, 8.4 ml, 12.6 mmol) was added dropwise. The mixture was stirred, warming to ambient temperature, for 2.5 h, and then quenched by successive addition of methanol (9 ml), ethanol (9 ml) and water (9 ml). The gelatinous mixture was diluted with ethyl acetate, and filtered through kieselguhr. The filtrate was washed with brine, dried (Na2SO4) and evaporated to give the title compound (0.79 g, 92%) as a colourless oil.

1. additionwas added dropwise
2. customquenched by successive addition of methanol (9 ml), ethanol (9 ml) and water (9 ml)
3. additionThe gelatinous mixture was diluted with ethyl acetate
4. filtrationfiltered through kieselguhr
5. washThe filtrate was washed with brine
6. dry with materialdried (Na2SO4)
7. customevaporated