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温度

0 °C

To a solution of tert.-butyl 4-(2-methyl-5-oxo-1,3-dioxolan-4-yl)-3-oxobutanoate (5.16 g, 20.0 mmol) in toluene (40.0 ml), sodium methoxide (1M in methanol) (20.5 was added at 0° C. over 10 minutes in an argon atmosphere and stirred at 0° C. for 30 minutes. After dropwise adding 1N hydrochloric acid (21.0 ml), the mixture was stirred at 0° C. for 10 minutes. After evaporating off the most of the organic solvent under reduced pressure, the mixture was extracted with ethyl acetate and washed with a saturated saline and a phosphate buffer (pH 7.0). The organic layers were combined, dried over sodium sulfate and concentrated under reduced pressure. The residue was subjected to silica gel column chromatography (hexane:acetone=2:1) to give pure 1-methyl 6-tert.-butyl 2-hydroxy-4-oxoadipate (4.39 g, 17.83 mmol). Yield, 89.2 %.

1. stirringthe mixture was stirred at 0° C. for 10 minutes
2. customAfter evaporating off the most of the organic solvent under reduced pressure
3. extractionthe mixture was extracted with ethyl acetate
4. washwashed with a saturated saline
5. dry with materialdried over sodium sulfate
6. concentrationconcentrated under reduced pressure