The catalytic enantioselective diorganozinc additions to cyclic diketones including pyrazolin‐4,5‐diones and isatins have been developed. In the presence of morpholine‐containing chiral amino alcohol ligand, the corresponding chiral cyclic tertiary alcohols were produced in good to excellent yields (up to 97 %) and enantioselectivities (up to 95 % ee). The notable feature of this protocol includes
Selenium-Promoted Intramolecular Oxidative Amidation of 2-(Arylamino)acetophenones for the Synthesis of<i>N</i>-Arylisatins
作者:Yong Liu、Hui Chen、Xiong Hu、Wang Zhou、Guo-Jun Deng
DOI:10.1002/ejoc.201300477
日期:2013.7
A convenient method for the synthesis of N-arylisatins from 2-(arylamino)acetophenones by using SeO2 as an oxidant is described. Various substituted N-arylisatins were selectively obtained in good to excellent yields. The reaction tolerates a wide range of functionalities.
alcohols or amines as nucleophiles in the presence of CF3SO3H is established. A series of polycyclic acridine derivatives bearing large π-conjugated systems were obtained in high yields, including some key intermediates for the synthesis of biologically active molecules. The photophysical properties of these synthesized acridines were investigated, demonstrating that the sulfur heterocyclic acridine 9w
建立了在CF 3 SO 3 H存在下通过醇或胺作为亲核试剂将靛红环化和酯化或酰胺化制备吖啶酯和酰胺的简单有效的合成方案。以高产率获得了一系列带有大π共轭体系的多环吖啶衍生物,包括一些用于合成生物活性分子的关键中间体。研究了这些合成吖啶的光物理性质,表明硫杂环吖啶9w以高量子产率获得。
Catalytic Enantioselective Ynamide Additions to Isatins: Concise Access to Oxindole Alkaloids
作者:Max Moskowitz、Christian Wolf
DOI:10.1002/anie.201814074
日期:2019.3.11
catalyzed by a bisoxazolidine copper complex under mild, base‐free reaction conditions, is described. The reaction is broad in scope, scalable, applicable to unprotected isatins, and provides efficient access to 3‐hydroxyoxindoles carrying a tetrasubstituted chiral center with excellent yields and enantioselectivities. Synthetically versatile, multifunctional 3‐hydroxyindolinones are obtained by hydration
Organocatalytic Insertion of Isatins into Aryl Difluoronitromethyl Ketones
作者:Ransheng Ding、Pegah R. Bakhshi、Christian Wolf
DOI:10.1021/acs.joc.6b02704
日期:2017.1.20
An organocatalytic method that achieves insertion of isatins into aryl difluoronitromethyl ketones under mild conditions is described. The reaction occurs in the presence of 20 mol % of DBU and with 100% atom economy. A series of isatin derived difluoronitromethyl substituted tertiary alcohol benzoates and naphthoates were prepared in 81–99% yield. The general synthetic usefulness of these 3-hydroxyoxindole