[EN] PROCESS FOR PREPARATION OF (3R)-2,4-DI-LEAVING GROUP-3-METHYLBUT-1-ENE [FR] PROCÉDÉ DE PRÉPARATION DE (3R)-2,4-DI-GROUPE PARTANT-3-MÉTHYLBUT-1-ÈNE
and eribulin families of compounds, this novel approach provides new opportunities for the development of improved syntheses of these complex and valuable compounds. In this Article, we report the syntheses of defined fragments I, MN, EFG, and A. Fragments I and MN were then coupled and elaborated to advancedintermediate IJKLMN, which was joined with fragment EFG to afford, after appropriate elaboration
描述了一种用于软海绵素 B 全合成的新策略,其特点是通过先形成 C-O 键,然后形成 C-C 键,从经典方法中逆转了许多环醚的顺序构建。利用尼古拉斯反应生成线性醚作为软海绵素 B 和软海绵素和艾日布林化合物家族其他成员全合成的前体,这种新方法为开发这些复杂且有价值的化合物的改进合成提供了新的机会。在本文中,我们报告了已定义片段I、MN、EFG和A的合成。片段I和MN然后将其偶联并细化为高级中间体IJKLMN,其与片段EFG结合,在适当的细化和大环内酯化后,提供更高级的多环中间体EFGHIJKLMN。后者的精心制作和与片段A 的偶联,然后进一步功能化,通过短而收敛的途径完成了软海绵素 B 的全合成。
[EN] FE/CU-MEDIATED KETONE SYNTHESIS<br/>[FR] SYNTHÈSE DE CÉTONE MÉDIÉE PAR FE/CU
申请人:HARVARD COLLEGE
公开号:WO2019009956A1
公开(公告)日:2019-01-10
Provided herein are methods for preparing ketone-containing organic molecules. The methods are based on novel iron/copper-mediated ("Fe/Cu-mediated") coupling reactions. The Fe/Cu-mediated coupling reaction can be used in the preparation of complex molecules, such as halichondrins and analogs thereof. In particular, the Fe/Cu-mediated ketolization reactions described herein are useful in the preparation of intermediates en route to halichondrins.
Asymmetric Ni(II)/Cr(II)-Mediated Coupling Reaction: Catalytic Process
作者:Hyeong-wook Choi、Katsumasa Nakajima、Damtew Demeke、Fu-An Kang、Hyuk-Sang Jun、Zhao-Kui Wan、Yoshito Kishi
DOI:10.1021/ol026981x
日期:2002.12.1
[reaction: see text] The stable, crystalline Cr(III)/sulfonamide complex 1a is shown to be an effective catalyst for the Ni/Cr-mediated couplingreaction. A possible mechanism is suggested for the process. 1a is also effective for other Cr-mediated couplingreactions. With this catalyst, a concise and efficient synthesis of the C14-C26 segment of halichondrins has been developed.
New Syntheses of E7389 C14−C35 and Halichondrin C14−C38 Building Blocks: Double-Inversion Approach
作者:Dae-Shik Kim、Cheng-Guo Dong、Joseph T. Kim、Haibing Guo、Jian Huang、Paolo S. Tiseni、Yoshito Kishi
DOI:10.1021/ja9058475
日期:2009.11.4
sequential use of catalytic asymmetric Cr-mediated coupling reactions, E7389 C14-C35 and halichondrin C14-C38 building blocks have been stereoselectively synthesized. The C19-C20 bond is first formed via the catalytic asymmetric Ni/Cr-mediated coupling, i.e., 8 + 9 --> 10 (90%; dr = 22:1), in which vinyl iodide 8 is used as the limiting substrate. The C23-C24 bond is then formed via the catalytic asymmetric