The Synthesis of<i>trans</i>-Flavan-3-ol Gallates by Regioselective Oxidative Etherification and Their Cytotoxicity Mediated by 67 LR
作者:Nana Shiraishi、Motofumi Kumazoe、Shinichiro Fuse、Hirofumi Tachibana、Hiroshi Tanaka
DOI:10.1002/chem.201602817
日期:2016.9.5
approach for the synthesis of trans‐flavan‐3‐ol gallates from epichlorohydrin. The trans‐flavan‐3‐ol gallates were prepared by the cycloetherification of the phenol at the C2 benzylic position of 2‐acylozyl‐1,3‐diarylpropane during regioselective C−H oxidation. The 1,3‐diarylpropanes were prepared starting from epichlorohydrin by epoxide opening with A and B ring precursors, followed by acylation of the resultant
我们报告了一种从表氯醇合成反式黄烷-3-醇没食子酸酯的手性池方法。通过在区域选择性CH氧化过程中2-酰基唑基1,3-二芳基丙烷的C2苄基位置处的苯酚进行环醚化,可以制备反式-flavan-3-醇没食子酸酯。1,3-二芳基丙烷的制备是从环氧氯丙烷开始,先用A和B环前体进行环氧化物开环,然后用没食子酰氯酰化所得的醇。表氯醇的两种对映异构体均可用,因此可以使用相同的方法制备相应的对映异构体。测试了化合物对U266细胞的细胞毒性,其中5-脱氧-7,3'- O-没食子儿茶素没食子酸二甲酯的细胞毒性比天然(-)-EGCG强十倍以上。此外,衍生物的绝对构型不会严重影响生物学活性。