Synthesis of Fluorenones through Rhodium-Catalyzed Intramolecular Acylation of Biarylcarboxylic Acids
摘要:
An efficient approach to the synthesis of fluorenones via the rhodium-catalyzed intramolecular acylation of biarylcarboxylic acids was developed. Using this procedure, fluorenones with various substituents can be synthesized in good to high yields. This work marks the first recorded use of catalytic intramolecular acylation to synthesize fluorenones.
Synthesis of Fluorenones from Benzaldehydes and Aryl Iodides: Dual C–H Functionalizations Using a Transient Directing Group
作者:Xiao-Yang Chen、Seyma Ozturk、Erik J. Sorensen
DOI:10.1021/acs.orglett.7b00161
日期:2017.3.3
The first synthesis of substituted fluorenones directly frombenzaldehydes and aryl iodides via a Pd(II)-catalyzed C(sp2)-H functionalization cascade is reported. Featuring anthranilic acid as an inexpensive transient directing group, the process is compatible with a variety of benzaldehydes and aryl iodides. A three-step synthesis of the antiviral drug Tilorone was completed in an excellent overall
C−H Bond Functionalization of Aryl Acids and Amines by ‘On‐water’ Reaction: Bi‐dentate Directing Group Enabled Synthesis of Biaryl and <i>m</i>‐Teraryl Carboxamides
作者:Ashutosh Verma、Anil J. Elias
DOI:10.1002/asia.202300191
日期:2023.6.15
conditions: A catalytic system involving ‘on-water’ methodology has been developed to synthesize mono and bis C−H bond functionalized aryl carboxamide and aryl picolinamide derivatives assisted by 8-aminoquinoline, 2-thiomethylaniline, and picolinamide directing groups.
Norbornene Derivatives-Controlled Palladium-Catalyzed Divergent Synthesis of Dibenzo[<i>a</i>,<i>c</i>]cycloheptenones and Fluorenones from Aryl Iodides and α-Oxocarboxylic Acids
作者:Liwei Zhou、Pengyang Jing、Zhiwei Li、Rui Liu、Jiannan Chen、Guobo Deng、Yun Liang、Yuan Yang
DOI:10.1021/acs.orglett.3c04065
日期:2024.1.26
A palladium-catalyzed divergent cascade decarboxylative annulation of aryliodides and α-oxocarboxylic acids using norbornene (NBE) derivatives as a controlled switch is reported. When NBE is used as a mediator, fluorenones are synthesized with moderate to excellent yields via a Catellani reaction that involves sequential ortho-C–H arylation and ipso-decarboxylative acylation of aryliodides. Employing
据报道,使用降冰片烯(NBE)衍生物作为受控开关,钯催化芳基碘化物和α-氧代羧酸的发散级联脱羧成环。当 NBE 用作介体时,通过 Catellani 反应以中等至优异的产率合成芴酮,该反应涉及芳基碘化物的连续邻位-C–H 芳基化和本身脱羧酰化。使用氧杂降冰片二烯 (ONBD) 代替 NBE 可以通过逆狄尔斯-阿尔德反应组装二苯并[ a , c ]环庚烯酮,而不是释放 ONBD。此外,该方法的合成效用通过产品的多样化得到证明。
Pd-Catalyzed C−H Functionalizations of <i>O</i>-Methyl Oximes with Arylboronic Acids
作者:Chang-Liang Sun、Na Liu、Bi-Jie Li、Da-Gang Yu、Yang Wang、Zhang-Jie Shi
DOI:10.1021/ol902552v
日期:2010.1.1
Useful methods have been developed to construct ortho-arylated aryl aldoximes, aryl ketoximes, and fluorenones via Pd(II)-catalyzed direct C-H arylation by using arylboronic acids as arylating reagents based on the analysis of the pathways of direct functionalization of aryl aldoximes.