Efficient Syntheses of Korupensamines A, B and Michellamine B by Asymmetric Suzuki-Miyaura Coupling Reactions
作者:Guangqing Xu、Wenzhen Fu、Guodu Liu、Chris H. Senanayake、Wenjun Tang
DOI:10.1021/ja409669r
日期:2014.1.15
Efficient asymmetricSuzuki-Miyauracouplingreactions are employed for the first time in total syntheses of chiral biaryl natural products korupensamine A and B in combination with an effective diastereoselective hydrogenation, allowing ultimately a concise and stereoselective synthesis of michellamine B. Chiral monophosphorus ligands L1-3 are effective for the syntheses of a series of functionalized
高效的不对称 Suzuki-Miyaura 偶联反应首次用于手性联芳基天然产物 korupensamine A 和 B 的全合成,并结合有效的非对映选择性氢化,最终实现了米歇尔胺 B 的简洁立体选择性合成。 手性单磷配体 L1-3通过不对称 Suzuki-Miyaura 偶联反应以优异的产率和对映选择性(高达 99% ee)合成一系列官能化手性联芳基化合物是有效的。高度极化的 BOP 基团与芳基硼酸偶联物的扩展 π 系统之间存在极性-π 相互作用被认为对于高对映选择性很重要。
Preparation and Application of Solid, Salt-Stabilized Zinc Amide Enolates with Enhanced Air and Moisture Stability
various N‐morpholino amides with TMPZnCl⋅LiCl (TMP=2,2,6,6‐tetramethylpiperidyl) and Mg(OPiv)2 in THF at 25 °C provides solid zinc enolates with enhanced air and moisture stability (t1/2 in air: 1–3 h) after solvent evaporation. These enolates undergo Pd‐ and Cu‐catalyzed cross‐couplings with (hetero)aryl bromides as well as allylic and benzylic halides. The arylated N‐morpholino amides were converted into
Palladium‐Catalyzed Dearomative
<i>syn</i>
‐1,4‐Carboamination with Grignard Reagents
作者:Conghui Tang、Mikiko Okumura、Yunbo Zhu、Annie R. Hooper、Yu Zhou、Yu‐Hsuan Lee、David Sarlah
DOI:10.1002/anie.201905021
日期:2019.7.22
functionalization of simple, nonactivated arenes with Grignardreagents has been established. This one‐pot method features a visible‐light‐mediated [4+2] cycloaddition between an arene and an arenophile, and subsequent palladium‐catalyzed allylic substitution of the resulting cycloadduct with a Grignardreagent. A variety of arenes and Grignardreagents can participate in this process, forming carboaminated
A dearomative 1,4-carboamination of arenes has been achieved using arenophile cycloaddition and subsequent palladium-catalyzed substitution with nonstabilized lithium enolates. This protocol delivers products with exclusive syn-1,4-selectivity and can be also conducted in an asymmetric fashion. The method allows rapid dearomative difunctionalization of simple aromatic compounds into functional small