Break‐and‐Build Strategy for the Synthesis of 2‐Benzoylbenzoxazoles from
<i>o</i>
‐Aminophenols and Acetophenones
作者:Le Anh Nguyen、Quoc Anh Ngo、Pascal Retailleau、Thanh Binh Nguyen
DOI:10.1002/adsc.202100150
日期:2021.4.13
required substrates bearing activating groups. Herein, we report an efficient method for the synthesis of such compounds by direct reactions of o‐aminophenols with acetophenones promoted by sulfur in DMSO. The reaction was found to proceed via a Willgerodt rearrangement‐type benzoxazolation of acetophenones followed by a benzylic oxidation to reinstall the carbonyl function. This method has a broad
A one-pot hypoiodite catalysed oxidative cycloetherification approach to benzoxazoles
作者:Siva Senthil Kumar Boominathan、Wan-Ping Hu、Gopal Chandru Senadi、Jaya Kishore Vandavasi、Jeh-Jeng Wang
DOI:10.1039/c4cc02425g
日期:——
A practical one-pot hypoiodite catalysed oxidative cyclization approach to synthesize alpha-ketobenzoxazole derivatives was successfully developed. This operationally simple protocol utilizes easily-accessible starting materials and has a broad substrate scope with excellent yields.
A Sustainable Synthesis of 2-Benzoxazyl and 2-Benzothiazyl Ketones from Alkynyl Bromides and 2-Amino(thio)phenols Promoted by a Recyclable Catalytic System
作者:Liangyan Cui、Yan He、Xuesen Fan
DOI:10.1002/cjoc.201100472
日期:2012.4
An environmentally and economically sustainablesynthesis of 2‐benzoxazyl ketones and 2‐benzothiazyl ketones through FeCl3·6H2O catalyzed tandem reactions of alkynylbromides with 2‐amino(thio)phenols in [bmim]BF4 has been developed. Remarkable advantages of this new synthetic strategy include high efficiency, readily available starting materials, and recyclable catalyst and reaction medium.
Palladium(II)/<i>N</i>-Heterocyclic Carbene-Catalyzed Direct C–H Acylation of Heteroarenes with <i>N</i>-Acylsaccharins
作者:Shanmugam Karthik、Thirumanavelan Gandhi
DOI:10.1021/acs.orglett.7b02877
日期:2017.10.6
N-Acylsaccharin represents a facile acyl group transfer agent to heteroarenes in the presence of Pd(II)/NHC complexes appended with a pyrene unit. Catalytic acylation of heteroarenes was enhanced by the noncovalent interaction between the pyrene unit and substrates. High functional group tolerance, broad substrate scope, and moderate to good yields of 2-acylated azoles are added features of this method
Synthesis of heteroaryl ketones via tandem reaction of 1,1-dibromoethenes
作者:Xuesen Fan、Yan He、Xinying Zhang、Shenghai Guo、Yangyang Wang
DOI:10.1016/j.tet.2011.05.111
日期:2011.8
A novel method for the synthesis of heteroaryl ketones through one-pot tandem reaction of 1,1-dibromoethenes with 2-amino(thio)phenols promoted by TBAF center dot 3H(2)O and RuCl3(5%)/air was developed. This novel method includes several reactions in one-pot and utilizes economical yet efficient reagents to generate synthetically and biologically interesting heteroaryl ketones under mild conditions with good efficiency. (C) 2011 Elsevier Ltd. All rights reserved.