Asymmetric Total Syntheses of (−)-α-Lycorane, (−)-Zephyranthine, and Formal Synthesis of (+)-Clivonine
作者:Yong-Jian Chen、Sen-Lin Cai、Chuan-Chuan Wang、Jin-Duo Cheng、Søren Kramer、Xing-Wen Sun
DOI:10.1002/asia.201700555
日期:2017.6.19
An asymmetric route to (−)-α-lycorane and (−)-zephyranthine, and a formal totalsynthesis of (+)-clivonine were achieved. A pivotal intermediate, which serves as a potent precursor for the divergent syntheses of these natural products, was accessed by a diastereoselective Pd-catalyzed cinnamylation of an N-tert-butanesulfinyl imine.
Catalytic, Asymmetric Total Synthesis of (+)-α-, (+)-β-, (+)-γ-, and (−)-δ-Lycorane
作者:Tian-Yuan Zhang、Lu-Yue Zhang、Xiao Liang、Kun Wei、Yu-Rong Yang
DOI:10.1021/acs.orglett.2c00905
日期:2022.4.22
The first collectively asymmetrictotalsynthesis of all members of lycorane, including (+)-α, (+)-β, (+)-γ, and (−)-δ, in a catalytic manner has been achieved. The cornerstone of this synthesis features an asymmetric, stereodivergent Ir/amine dual catalytic α-allylation of 2-phthalimidoacetaldehyde.
An Enantioselective Approach to
<scp>Heteroatom‐Containing</scp>
Bicyclic Derivatives via
<scp>Inverse‐Electron‐Demand</scp>
Diels−Alder Reactions
作者:Jun‐Xiong He、Xu‐Ge Si、Qi‐Tao Lu、Qian‐Wei Zhang、Quan Cai
DOI:10.1002/cjoc.202200441
日期:2023.1
important pharmacophores and prevalent in bioactive natural products and drug molecules. Herein, we report a unified approach for the divergent synthesis of chiral heteroatom-containing bicyclic derivatives by lanthanide (III)-catalyzed asymmetric inverse-electron-demand Diels–Alder reactions of 2-pyrones. These reactions occur with various readily available dihydropyrroles and dihydrofurans as dienophiles
A palladium/PC-Phos-catalyzed asymmetricHeck/Tsuji–Trost reaction of amino-tethered 1,3-cyclohexadiene with aryl and alkenyl halides was developed. This method delivered various functionalized chiral hexahydroindoles in good yields with up to 98 % ee. The application of this reaction to the concise synthesis of (−)-α-Lycorane was demonstrated.
开发了钯/PC-Phos 催化的氨基系链 1,3-环己二烯与芳基和烯基卤化物的不对称 Heck/Tsuji–Trost 反应。该方法以高达 98% ee 的良好产率提供了各种功能化的手性六氢吲哚。证明了该反应在 (−)-α-Lycorane 简明合成中的应用。
Interconversions of Amaryllidaceae Alkaloids by Sodium and Amyl Alcohol<sup>1</sup>