Reversal of Selectivity in Gold-Catalyzed Cyclizations of 3,3-Disubstituted 1,4-Diynes
摘要:
A general synthetic access to 3,3-disubstituted 1,4-diynes bearing a quaternary carbon center from acetylacetone was developed. The compounds were cyclized to the corresponding enol ethers by cationic gold complexes. The reactions occur in complete exo-selectivity in contrast to compounds incorporating an alkoxy substituent in the 3-position. A mechanistic rationale for this reversal of selectivity is provided.
An Efficient and Mild CuI/<scp>l</scp>-Proline-Catalyzed Arylation of Acetylacetone or Ethyl Cyanoacetate
作者:Yongwen Jiang、Nan Wu、Haihong Wu、Mingyuan He
DOI:10.1055/s-2005-918921
日期:——
The coupling reaction of aryl iodides with acetylacetone or ethyl cyanoacetate under catalysis of CuI/l-proline works at relatively mild conditions to provide 3-aryl-2, 4-pentanediones and α-aryl cyanoacetates in moderate to good yields.
[EN] DINUCLEAR PLATINUM EMITTER COMPLEXES AND METHODS OF MAKING AND USING THEREOF<br/>[FR] COMPLEXES ÉMETTEURS DE PLATINE DINUCLÉAIRES ET LEURS PROCÉDÉS DE FABRICATION ET D'UTILISATION
申请人:[en]VERSITECH LIMITED
公开号:WO2022253220A1
公开(公告)日:2022-12-08
Described herein are dinuclear platinum (II) emitter complexes and their methods of making and using thereof. The design of the dinuclear platinum (II) emitters results in short radiative lifetimes and high quantum yields. The dinuclear platinum (II) emitter complexes can be used to fabricate blue emitting OLEDs.
Reversal of Selectivity in Gold-Catalyzed Cyclizations of 3,3-Disubstituted 1,4-Diynes
A general synthetic access to 3,3-disubstituted 1,4-diynes bearing a quaternary carbon center from acetylacetone was developed. The compounds were cyclized to the corresponding enol ethers by cationic gold complexes. The reactions occur in complete exo-selectivity in contrast to compounds incorporating an alkoxy substituent in the 3-position. A mechanistic rationale for this reversal of selectivity is provided.