Iron(III) Chloride Mediated
<i>para</i>
‐Selective C‐H Functionalization: Access to C5‐Chloro and C5,C7‐Dichloro/Dianisyl Substituted 2‐Arylbenzoxazoles
作者:Kanchanbala Sahoo、Niranjan Panda
DOI:10.1002/adsc.202101359
日期:2022.3
Iron(III) chloride mediated para-selective C−H chlorination and subsequent annulation of 2-amidophenol to synthesize C5- and C5, C7-chlorinated benzoxazoles was developed. Further, the oxidative cross-dehydrogenative coupling of amidophenol with anisole by ferricchloride was explored to achieve the remotely anisylated benzoxazoles.
Multicomponent Synthesis of Isoindolinone Frameworks via Rh<sup>III</sup>-Catalysed in situ Directing Group-Assisted Tandem Oxidative Olefination/Michael Addition
作者:Liang Wang、Xi Liu、Jian-biao Liu、Jun Shen、Qun Chen、Ming-yang He
DOI:10.1002/asia.201800120
日期:2018.4.4
A RhIII‐catalysed three‐component synthesis of isoindolinone frameworks via direct assembly of benzoyl chlorides, o‐aminophenols and activated alkenes has been developed. The process involves in situ generation of o‐aminophenol (OAP)‐based bidentate directing group (DG), RhIII‐catalysed tandem ortho C−H olefination and subsequent cyclization via aza‐Michael addition. This protocol exhibits good chemoselectivity
Access to C4-arylated benzoxazoles from 2-amidophenol through C–H activation
作者:Kanchanbala Sahoo、Priyanka Pradhan、Niranjan Panda
DOI:10.1039/d0ob00061b
日期:——
A Pd-catalyzed aerobic approach to access C4-aryl benzoxazoles by tandem C-H ortho-arylation and acid-mediated annulation of 2-amidophenol has been presented. The directing potential of the -NHCOR group over the -OH group was exploited for selective arylation adjacent to the amide group. Deuterium labeling experiments suggest that palladation predominantly occurs adjacent to the -NHCOR group and is
Synthesis of 4‐Alkenyl Benzoxazoles via Pd‐catalyzed
<i>ortho</i>
C−H Functionalization of 2‐Amidophenols
作者:Niranjan Panda、Kanchanbala Sahoo
DOI:10.1002/adsc.201801272
日期:2019.2
A one‐pot direct transformation to remotely C−H alkene functionalized 2‐aryl benzoxazoles from the reaction of amidophenol and electronically deficient olefin was reported. Control experiments confirm that the Pd‐catalyzed regioselective C−Hactivation/alkenylation occurs at the first step by leading to ortho‐alkenylated amidophenol; which subsequently underwent tandem intramolecular annulation to
Supported Pd-catalyzed ring opening and chemoselective aminocarbonylative coupling of benzoxazoles with aryl iodides
作者:Pushkar Mehara、Ajay Kumar Sharma、Ashish Kumar、Poonam Sharma、Pralay Das
DOI:10.1039/d4cy00070f
日期:——
A tandem approach using polystyrene supported Pd catalyzed ring opening aminocarbonylative coupling of benzoxazoles with aryl iodides has been developed for the synthesis of N-(2-hydroxyphenyl)benzamides using solid oxalic acid as the CO source.
以固体草酸为 CO 源,开发了一种串联方法,利用聚苯乙烯支撑的钯催化苯并恶唑与芳基碘化物的开环氨基羰基偶联合成 N-(2-羟基苯基)苯甲酰胺。