[EN] PRINS REACTION AND COMPOUNDS USEFUL IN THE SYNTHESIS OF HALICHONDRIN MACROLIDES AND ANALOGS THEREOF<br/>[FR] RÉACTION DE PRINS ET DE COMPOSÉS UTILES DANS LA SYNTHÈSE DE MACROLIDES D'HALICHONDRINE ET DE SES ANALOGUES
申请人:EISAI R&D MAN CO LTD
公开号:WO2019136145A1
公开(公告)日:2019-07-11
The invention provides methods utilizing Prins reaction in the preparation of compounds that may be useful as intermediates in the synthesis of halichondrin macrolides and analogs thereof. The invention also provides compounds that may be useful as intermediates in the synthesis of a halichondrin macrolides and methods for preparing the same.
[EN] INTERMEDIATES FOR PREPARING HALICHONDRIN COMPOUNDS AND PREPARATION METHOD THEREFOR<br/>[FR] INTERMÉDIAIRES POUR LA PRÉPARATION DE COMPOSÉS HALICHONDRINE ET LEUR PROCÉDÉ DE PRÉPARATION<br/>[ZH] 用于制备软海绵素类化合物的中间体及其制备方法
Dramatic Improvement in Catalyst Loadings and Molar Ratios of Coupling Partners for Ni/Cr-Mediated Coupling Reactions: Heterobimetallic Catalysts
作者:Xiang Liu、James A. Henderson、Takeo Sasaki、Yoshito Kishi
DOI:10.1021/ja9079308
日期:2009.11.25
Two new ligands 1a,b are reported. Upon treatment with 1 equiv of NiCl2 center dot(MeOCH2)(2), 1a,b give the corresponding Ni complexes. X-ray analysis of 1a-NiCl2 established that the NiCl2 is selectively coordinated to the phenanthroline nitrogens. Ni/Cr heterobimetallic catalysts 1a,b center dot CrCl2/NiCl2, prepared from 1a,b center dot NiCl2, have been shown to behave exceptionally well in catalytic asymmetric Ni/Cr-mediated couplings, with highlights including the following: (1) 1-2 mol % catalyst is sufficient to complete the coupling; (2) only negligible amounts of the dimers, byproducts formed through the alkenyl Ni species, are observed; (3) the coupling goes to completion even with a 1:1 molar ratio of the coupling partners; and (4) the asymmetric induction is practically identical with that obtained from the coupling with the Cr catalysts prepared from (S)-sulfonamides 2a,b. The scope of the new Ni/Cr heterobimetallic catalysts was briefly studied using four additional aldehydes. The applicability of the new catalysts to polyfunctional substrates was demonstrated by two C-C bond formations chosen from the hatichondrin/E7389 synthesis as examples.
PRINS REACTION AND COMPOUNDS USEFUL IN THE SYNTHESIS OF HALICHONDRIN MACROLIDES AND ANALOGS THEREOF
申请人:EISAI R&D MANAGEMENT CO., LTD.
公开号:US20200331928A1
公开(公告)日:2020-10-22
The invention provides methods utilizing Prins reaction in the preparation of compounds that may be useful as intermediates in the synthesis of halichondrin macrolides and analogs thereof. The invention also provides compounds that may be useful as intermediates in the synthesis of a halichondrin macrolides and methods for preparing the same.