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The obtained residue was suspended in water (20 mL) and extracted with 3 ¡Á 50 mL of methylene chloride. The organic extracts were combined, washed with water and brine, and dried over with anhydrous sodium sulfate. The dried solution was then evaporated to obtain the crude product as yellow solid, which was purified by flash chromatographic column (petroleum ether/ethyl acetate: 10/1) to afford 5 Õâ¸öºó´¦ÀíÊÇÔõô²Ù×÷µÄ£¬ÓÐÈËÄܰïÎÒ¿´Ò»ÏÂÂ𣿷dz£¸Ðл£¡ |
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- Ó¦Öú: 452 (˶ʿ)
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- ×¢²á: 2014-07-17
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