反应详情

2-(5-Methoxyhept-1-yl)bicyclo[3.3.0]octan-7-one {hexahydro-4-(5-methoxyheptyl)-2(1H)-pentalenone} (4 g, 0.0158 moles) diluted in ether is added dropwise to a stirring solution of ethyl magnesium bromide (0.0158 moles) dissolved with diethyl ether. The mixture is cooled in an ice bath during the addition. The ice bath is removed and the solution stirred for an additional hour. The reaction is quenched with water and a 15% sulfuric acid solution. The organic phase is separated and the solvent removed under vacuum. The aqueous layer is extracted with ether (2×200 ml) and the extracts are combined with the organic layer and dried over anhydrous sodium sulfate. The solid is filtered off and the remaining solvent removed leaving a clear, pale yellow oil. The crude product is subsequently chromatographed on silica gel yielding desired product as a clear colorless oil (1.7 g, 6.3 mmoles).

1. temperatureThe mixture is cooled in an ice bath during the addition
2. customThe ice bath is removed
3. customThe reaction is quenched with water
4. customThe organic phase is separated
5. customthe solvent removed under vacuum
6. extractionThe aqueous layer is extracted with ether (2×200 ml)
7. dry with materialdried over anhydrous sodium sulfate
8. filtrationThe solid is filtered off
9. customthe remaining solvent removed
10. customleaving a clear, pale yellow oil