反应详情

A mixture of (1R*,5S*,6RS)-8-benzyl-6-(tert-butoxycarbonyl)-1-phenyl-8-azabicylco[3.2.1]oct-3-en-2-one (Description 18; 26 g, 66 mmol), 10% palladium on charcoal (3.5 g, 3.3 mmol), ethyl acetate (50 ml) and methanol (100 ml) was stirred under hydrogen atmosphere (1 atm) at room temperature for 1 hour. The reaction mixture was treated with dichloromethane (500 ml), filtered through a pad of Celite™. The filter cake was well washed with dichloromethane and the filtrate was concentrated to give the title compound as a solid (26 g, 100%). The isomers were separated on silica gel (isohexane:ethyl acetate) and crystallised from acetone:isohexane yielding pure ketones as a colourless crystals.

1. filtrationfiltered through a pad of Celite™
2. washThe filter cake was well washed with dichloromethane
3. concentrationthe filtrate was concentrated