Perovskones、Hydrangenone 和 Hydrangenone B 的不对称全合成和生物合成意义
摘要:
Perovskones 和 hydrangenones 是结构复杂的三萜类化合物家族,主要从丹参属药用植物中分离出来。这些类异戊二烯表现出广泛的生物活性,例如抗肿瘤和抗疟原虫活性。在这里,我们报告了 perovskone、perovskone C、D、F、hydrangenone 和 hydrangenone B 的集体全合成。 这项工作的关键策略包括:(1)不对称光烯醇化/Diels-Alder 反应被开发来构建一个带有三个连续四元中心的三环环,用于构建核心icetexane骨架;(2) 受生物启发的钙钛矿 D 与反式的Diels-Alder 反应-α-罗勒烯被应用于立体定向生成钙酮;(3) 开发了后期氧化和成环步骤来合成钙酮和氢化物酮。我们的合成工作表明:(1)钙酮 D 可能作为钙酮生物合成的前体;(2)含有五元 D 环的三氢醌和三氢醌 B 的形成可能涉及氧化环裂解和环再生过程.
Four-Electron Electrocyclic Ring-Opening/Intermolecular [4+2] Cycloadditions of α-Hydroxycyclobutenones: Stereoselective Synthesis of Multiple Substituted δ-Lactams
作者:Peidong Song、Qing Li、Congcong Wang、Wenfa Wu、Xu Mao、Jiajia Wang、Xiangdong Hu
DOI:10.1002/adsc.201501152
日期:2016.4.14
four‐electron electrocyclic ring‐opening/intermolecular [4+2] cycloaddition of α‐hydroxycyclobutenones is reported. The reaction represents the first example for the intermolecular cycloaddition of the extensively studied enol‐ketene intermediate, and provides a new synthetic route to multiply substituted δ‐lactams in high stereoselectivity.
Described herein are compounds of Formulae (I)-(II), and pharmaceutically acceptable salts, and pharmaceutical compositions thereof. Also provided are methods and kits involving the inventive compounds or compositions for treating or preventing proliferative diseases such as cancers (e.g., lung cancer, large bowel cancer, pancreas cancer, biliary tract cancer, or endometrial cancer), benign neoplasms, angiogenesis, inflammatory diseases, autoinflammatory diseases, and autoimmune diseases in a subject.
Liebeskind, Lanny S.; Chidambaram, Ramakrishnan; Mitchell, David, Pure and Applied Chemistry, 1988, vol. 60, p. 27 - 34
作者:Liebeskind, Lanny S.、Chidambaram, Ramakrishnan、Mitchell, David、Foster, Bruce S.
DOI:——
日期:——
A Rh(II)-catalyzed cycloaddition approach toward the synthesis of komaroviquinone
作者:Albert Padwa、Majid J. Chughtai、Jutatip Boonsombat、Paitoon Rashatasakhon
DOI:10.1016/j.tet.2008.01.129
日期:2008.5
Using a rhodium (II)-catalyzed cyclization/cycloaddition sequence as the key reaction step, the icetexane core of komaroviquinone was constructed by an intramolecular dipolar-cycloaddition of a carbonyl ylide dipole across a tethered pi-bond. The ylide was arrived at by cyclization of a rhodium carbenoid intermediate onto a proximal ester group. Efforts toward the preparation of the required precursor for elaboration to the natural product are discussed. (C) 2008 Elsevier Ltd. All rights reserved.
Protecting-Group-Free Synthesis of Taiwaniaquinone H Using a One-Pot Thermal Ring Expansion/4π-Electrocyclization Strategy
作者:Xiuxiang Yan、Xiangdong Hu
DOI:10.1021/jo5008652
日期:2014.6.6
A strategy to the 6-5-6 tricyclic scaffold of taiwaniaquinoids was established on the basis of a one-pot thermal ring expansion/4 pi-electrocyclization process. The efficiency of this methodology has been demonstrated through its application in the total synthesis of taiwaniaquinone H, which has been accomplished in three steps and 14% overall yield in a protecting-group-free manner starting from commercially available materials.