Stereoselective synthesis of 17,18-epoxy derivative of EPA and stereoisomers of isoleukotoxin diol by ring opening of TMS-substituted epoxide with dimsyl sodium
作者:Yutaro Nanba、Riku Shinohara、Masao Morita、Yuichi Kobayashi
DOI:10.1039/c7ob02291c
日期:——
corresponding mono mesylate was prepared and subjected to epoxide ring formation to afford 17(R),18(S)-EpETE stereoselectively. Similarly, a reaction of the anti epoxy alcohol derived from (R)-1-TMS-1-octen-3-ol with NaDMSO gave the anti form of 1-nonene-3,4-diol, which was converted to 12(S),13(R)-isoleukotoxin diol through Wittig reaction. 12(R),13(R)-Isoleukotoxin diol was synthesized in a similar manner
TMS取代的环氧醇(及其衍生物)与二甲基钠(NaDMSO)反应生成1-烯烃-3,4-二醇,用于合成对映异构体富集的17(R),18(S)-EpETE和两个异白细胞毒素二醇的非对映异构体。在17(R),18(S)-EpETE的合成中,衍生自(R)-1-TMS-1-戊烯-3-醇的环氧醇的α-乙氧基乙基醚(EE)与NaDMSO反应生成得到单EE保护的1-己烯-3,4-二醇。将通过硼氢化/氧化获得的醛进行Wittig反应,得到单EE-保护的二醇。制备相应的甲磺酸酯并使其形成环环,得到17(R),18(S)-EpETE立体选择。类似地,(R)-1-TMS-1-辛烯-3-醇衍生的抗环氧醇与NaDMSO的反应得到1-壬烯-3,4-二醇的抗形式,其转化为12(S),13(R)-异uk毒素二醇通过Wittig反应。以类似的方式合成了12(R),13(R)-异豆毒素二醇。