反应详情

0.76 ml (5.4 mmol) of triethylamine, 807 mg (5.4 mmol) of 4-(1-pyrrolidinyl)pyridine and 674 mg (4.5 mmol) of 2-ethyl-2-methylbutyryl chloride were added to a solution of 500 mg (0.91 mmol) of (4R,6R)-6-{2-[(1S,2S,6S,8S,8aR)-1,2,6,7,8,8a-hexahydro-6-t-butyldimethylsilyloxy-8-hydroxy-2-methyl-1-naphthyl]ethyl}tetrahydro-4-t-butyldimethylsilyloxy-2H-pyran-2-one [prepared as described in Example B, above] in 10 ml of benzene and the resulting mixture was heated under reflux for 5 hours. At the end of this time, the reaction mixture was diluted with 50 ml of ethyl acetate. The diluted mixture was then washed with 30 ml of water, 30 ml of a 10% w/v aqueous solution of citric acid, a saturated aqueous solution of sodium hydrogencarbonate and a saturated aqueous solution of sodium chloride, in that order. The organic phase was then dried over anhydrous magnesium sulfate, after which this phase was filtered. The filtrate was concentrated by evaporation under reduced pressure and the concentrate was purified by flash column chromatography through silica gel, using a 5:1 by volume mixture of hexane and ethyl acetate as the eluent, to give 601 mg (100% yield) of the title compound.

1. customprepared
2. temperatureunder reflux for 5 hours
3. washThe diluted mixture was then washed with 30 ml of water, 30 ml of a 10% w/v aqueous solution of citric acid
4. dry with materialThe organic phase was then dried over anhydrous magnesium sulfate
5. filtrationafter which this phase was filtered
6. concentrationThe filtrate was concentrated by evaporation under reduced pressure
7. customthe concentrate was purified by flash column chromatography through silica gel
8. additionby volume mixture of hexane and ethyl acetate as the eluent