...
首页> 外文期刊>Bulletin of the Chemical Society of Japan >Total Syntheses of the Non-Peptide Bradykinin B1 Receptor Antagonist Velutinol A and Its Analogs, seco-Pregnanes with a Cage-Like Moiety
【24h】

Total Syntheses of the Non-Peptide Bradykinin B1 Receptor Antagonist Velutinol A and Its Analogs, seco-Pregnanes with a Cage-Like Moiety

机译:非肽Bradykinin B1受体拮抗剂velutinol a及其类似物,静碱基,笼状部分的总合成

获取原文
获取原文并翻译 | 示例
           

摘要

We describe here the syntheses of velutinol A (1) and the structurally similar compounds 2-4 sharing a highly oxygenated seco-pregnane cage-like structure. The synthesis of velutinol A (1, 15,16-seco-pregnane) features the highly regioselective construction of Delta(14) silyl enol ether from 15-keto-21,22-diol, followed by stereoselective introduction of a sterically hindered beta-hydroxy group at the C14 position by Rubottom oxidation. Prolonged reaction time and the use of an excess amount of mCPBA at this step allowed double Rubottom oxidation, enabling us to introduce the requisite hydroxy groups at the C14 and C16 positions in one pot. Subsequent oxidative cleavage of the C15-16 bond, deprotection, and intramolecular acetalization allowed the concise total synthesis of velutinol A (1). Utilization of alpha,alpha-dihydroxyketone, the double Rubottom oxidation product, for formation of the ether F-ring by 5-exo-cyclization, and subsequent C14-21 oxidative cleavage, effectively achieved the synthesis of pentalinonside-aglycon (2). Construction of the 14,15-seco-structures of two other analogs, argeloside aglycon (3) and illustrol (4), was achieved by Baeyer-Villiger oxidation of 15(21)-keto derivatives. Introduction of the 20-oxo group potentially embedded in argeloside aglycon was accomplished by Wacker oxidation of Delta(20), which was constructed by Grieco-Nishizawa syn-beta-elimination of the C21-primary alcohol obtained by reduction of the Baeyer-Villiger product. Intramolecular double acetalization of the 15,16-dihydroxy-14,20-oxo derivative to form the cage-like structure of the DEF-rings required a moderately weak acid. This step was the key to accessing argeloside aglycon (3), as otherwise the easily aromatized beta,gamma-dihydroxyketone moiety was transformed to furan. Sharpless asymmetric dihydroxylation of Delta(20) to set the C20 stereocenter, followed by intramolecular double acetalization, achieved the stereoselective synthesis of illustrol With all synthesized compounds, structural requirements of steroidal bradykinine B1 receptor antagonist would be revealed.
机译:在此描述Velutinol A(1)的合成和结构上类似的化合物2-4共用高氧化的Seco-Preakan笼状结构。 Velutinol A(1,15,16-妊娠)的合成具有来自15-酮-21,22-二醇的δ(14)甲硅烷基烯醇醚的高度区域选择性,其次是立体选择性引入空间抑制β-通过粗氧化物氧化在C14位置的羟基。延长反应时间和使用过量的MCPBA在该步骤中允许双粗咯醇氧化,使我们能够在一个罐中引入C14和C16位置的必需的羟基。随后的C15-16键,脱保护和分子内缩略化的随后氧化切割允许简明的全部合成Velutinol A(1)。用5-外环化形成α,α-二羟基酮酮,双粗酮氧化产物,用于形成醚F环,随后的C14-21氧化切割,有效地实现了蛋白贡献 - 蛋白(2)的合成。通过Baeyer-Villiger氧化为15(21) - 酮衍生物,实现了另外两种类似物,氨基硒酰胺酰胺(3)和Illustrol(4)的14,15秒结构。通过兼通过减少Baeyer-Villiger产品获得的C21-初级醇构建的δ氧化,通过兼通过减少Baeyer-Villiger产品获得的C21-初级醇构成的Δα(20)所完成的20-氧代组的引入。 15,16-二羟基-14,20-氧代衍生物的分子内双缩略化以形成遮转环的笼状结构需要适度的弱酸。该步骤是进入氨基硼胺氨基(3)的关键,否则易于芳族化β,γ-二羟基酮部分转化为呋喃。 δ(20)的可逆性不对称二羟基化,以设定C20立体封闭体,然后进行分子内的双缩醛化,实现了所有合成化合物的Illustrol的立体选择性合成,术后甾体Bradykinine B1受体拮抗剂的结构要求将被揭示。

著录项

  • 来源
  • 作者单位

    Niigata Univ Pharm &

    Appl Life Sci Dept Appl Life Sci Akiha Ku 265-1 Higashijima Niigata 9658603 Japan;

    Niigata Univ Pharm &

    Appl Life Sci Dept Appl Life Sci Akiha Ku 265-1 Higashijima Niigata 9658603 Japan;

    Niigata Univ Pharm &

    Appl Life Sci Dept Appl Life Sci Akiha Ku 265-1 Higashijima Niigata 9658603 Japan;

    Niigata Univ Pharm &

    Appl Life Sci Dept Appl Life Sci Akiha Ku 265-1 Higashijima Niigata 9658603 Japan;

    Niigata Univ Pharm &

    Appl Life Sci Dept Appl Life Sci Akiha Ku 265-1 Higashijima Niigata 9658603 Japan;

    Niigata Univ Pharm &

    Appl Life Sci Dept Appl Life Sci Akiha Ku 265-1 Higashijima Niigata 9658603 Japan;

    Niigata Univ Pharm &

    Appl Life Sci Dept Appl Life Sci Akiha Ku 265-1 Higashijima Niigata 9658603 Japan;

    Niigata Univ Pharm &

    Appl Life Sci Dept Appl Life Sci Akiha Ku 265-1 Higashijima Niigata 9658603 Japan;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

    Bradykinin B1 receptor (B1R); seco-Pregnane; Natural product syntheses;

    机译:Bradykinin B1受体(B1R);Seco-Pregnane;天然产品合成;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号