methyl 1,4-dioxaspiro[4.5]dec-7-ene-8-carboxylate

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: 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. was added dropwise quenched by successive addition of methanol (9 ml), ethanol (9 ml) and water (9 ml) The gelatinous mixture was diluted with ethyl acetate filtered through kieselguhr The filtrate was washed with brine dried (Na2SO4) evaporated