A Stereodivergent Strategy for the Preparation of Corynantheine and Ipecac Alkaloids, Their Epimers, and Analogues: Efficient Total Synthesis of (−)-Dihydrocorynantheol, (−)-Corynantheol, (−)-Protoemetinol, (−)-Corynantheal, (−)-Protoemetine, and Related
作者:Wei Zhang、Juho Bah、Andreas Wohlfarth、Johan Franzén
DOI:10.1002/chem.201102012
日期:2011.12.2
Here we present a general and common catalytic asymmetric strategy for the total and formal synthesis of a broad number of optically active natural products from the corynantheine and ipecac alkaloid families, for example, indolo[2,3‐a]‐ and benzo[a]quinolizidines. Construction of the core alkaloid skeletons with the correct absolute and relative stereochemistry relies on an enantioselective and diastereodivergent
在这里,我们提出了一种通用和通用的催化不对称策略,用于从大红霉素和吐根碱生物碱家族中广泛合成光学活性天然产物,例如吲哚[2,3- a ]-和苯并[ a]]喹唑烷。具有正确的绝对和相对立体化学的核心生物碱骨架的构建依赖于对映选择性和非对映异构单锅级联序列,然后进行额外的非对映异构反应步骤。这允许对喹诺酮生物碱的四种可能的差向异构体中的三种进行对映异构和非对映选择性合成,这些异构体是通过使用常见的合成途径从常见且易于获得的起始原料开始的。已经集中在排除保护基和限制合成中间体的分离和纯化上。该方法适用于天然产物(-)-二氢甲氧萘酚,(-)-水苏糖醇,(-)-甲氧萘酚,(-)-异丙甲酚,(-)-二氢甲氧萘酚,(-)-甲氧乙醛,(- )-protoemetine,( - ) - (15小号)-羟基二氢二十烷醇及其一系列非天然差向异构体。这种策略的潜力在合成生物学上令人感兴趣的天然产物类似物时也得到了