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red by tlc using hexanes/ethyl acetate (3:1) as the mobile phase. the reaction was quenched after 24 h by pouring the mixture into 100 ml of ice-cold water with stirring. in the synthesis of 14, a sticky mass was observed in the aqueous solution after quenching. thus, the product was extracted using ethyl acetate (3 100 ml), dried over sodium sulfate, and concentrated under reduced pressure. on the other hand, in the synthesis of 5 and 6, a precipitate formed after quenching with cold water, which was then filtered and crystallized with hot acetone and ethanol (1:1). for compounds 16, the crude product was purified by flash chromatography using hexanes and ethyl acetate as the solvent system in increasing order of polarity. all compounds were identi
最終更新： 2020-09-23
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