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.
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
A Rearrangement of 4-Phenylbenzo[d]oxazoles to Phenanthridin-4-ols
作者:Alexander S. Fisyuk、Anton L. Shatsauskas、Ekaterina S. Keyn、Anton J. Stasyuk、Sergey A. Kirnosov、Vladislav Yu. Shuvalov、Anastasia S. Kostyuchenko
DOI:10.1055/a-2193-5593
日期:2024.2
A new approach was developed for the synthesis of phenanthridin-4-ols and 4-hydroxyphenanthridin-6(5H)-one derivatives in 43–89% yields based on the AlCl3-mediated rearrangement of available 4-phenylbenzo[d]oxazoles and 4-phenyl-1,3-benzoxazol-2(3H)-one. The quantum chemical calculations were used to describe the mechanism and predict the thermodynamic parameters of the reaction under study.
Thiophene-Rich Benzoxazines with an Amide Moiety: Integration of Structural and Hydrogen Bonding Influence on the Polymerization Mechanism by Experimental and Computational Studies
作者:Nan Li、Shengfu Yang、Kan Zhang
DOI:10.1021/acs.macromol.3c01515
日期:2023.9.12
spectroscopy. Ring-opening polymerization processes of benzoxazines and thermal properties of their resulting polybenzoxazines were studied by differential scanning calorimetry, in situ FT-IR spectroscopy, and thermogravimetric analysis. In addition, a combined experimental and computational study using both 1D and 2D NMR as well as density functional theory calculations provided kinetic insights into