Syntheses of Strychnine, Norfluorocurarine, Dehydrodesacetylretuline, and Valparicine Enabled by Intramolecular Cycloadditions of Zincke Aldehydes
作者:David B. C. Martin、Lucas Q. Nguyen、Christopher D. Vanderwal
DOI:10.1021/jo2020246
日期:2012.1.6
base-mediated intramolecular Diels–Alder cycloadditions of tryptamine-derived Zincke aldehydes is described. This important complexity-generating transformation provides the tetracyclic core of many indole monoterpene alkaloids in only three steps from commercially available starting materials and played a key role in short syntheses of norfluorocurarine (five steps), dehydrodesacetylretuline (six steps), valparicine
描述了由色胺衍生的锌醛的碱基介导的分子内Diels-Alder环加成反应的完整过程。这项重要的复杂性转化过程可从市售起始原料仅三步即可提供许多吲哚单萜生物碱的四环核,并且在正氟尿嘧啶的短合成(五步),脱氢脱乙酰基苯甲酸(六步),瓦尔帕比星(七步)的短合成中发挥了关键作用。 ,和士的宁(六个步骤)。还讨论了该反应的合理机理可能性,产物令人惊讶地容易的二聚化,以及在特定条件下出乎意料的环还原以再生锌酮醛。