Photochemical and thermal transformations of 2(3H)-furanones and bis(benzofuranones). A laser flash photolysis study
作者:B. B. Lohray、C. V. Kumar、P. K. Das、M. V. George
DOI:10.1021/ja00336a010
日期:1984.11
Photochemical and thermal transformations of a few 2(3H)-furanones and bis(benzofuranones) were investigated in detail. Laser flash photolysis technique was employed for the first time to examine the mechanistic aspects of these photochemical reactions. Spectral and kinetic data are presented for the triplets of 2(3H)-furanones containing styrene and cis-stilbene moieties constrained into planar geometries
Catalytic Oxidation of 3-Arylbenzofuran-2(3<i>H</i>)-ones with PCC-H<sub>5</sub>IO<sub>6</sub>: Syntheses of 3-Aryl-3-hydroxy/3-amido-3-arylbenzofuran-2(3<i>H</i>)-ones
作者:Bhaskar B. Dhotare、Mukesh Kumar、Sandip K. Nayak
DOI:10.1021/acs.joc.8b01395
日期:2018.9.7
A pyridinium chlorochromate (PCC)-mediated facile oxidative dimerization of 3-arylbenzofuran-2-ones at ambient temperature was developed which undergo oxidative cleavage to 3-aryl-3-hydroxy-benzofuran-2-ones with PCC at elevated temperatures. Finally, direct oxidation of 3-arylbenzofuran-2-ones to 3-aryl-3-hydroxy-benzofuran-2-ones was realized using a combination of PCC (10 mol %) and 2.0 equiv of
Recyclable nickel-catalyzed C–H/O–H dual functionalization of phenols with mandelic acids for the synthesis of 3-aryl benzofuran-2(3<i>H</i>)-ones under solvent-free conditions
Cooperative catalysis: Green synthesis of 3-aryl benzofuran-2(3H)-ones under solvent-free conditions from phenols and mandelic acids using recyclable Ni(OTf)2 as a catalyst.
A metal-free approach to highly functionalized 3-substituted-3-arylbenzofuran-2(3<i>H</i>)-ones
作者:Bhaskar B. Dhotare、Sahil Kumar、Amey Wadawale、Sandip K. Nayak、Mukesh Kumar、Dibakar Goswami
DOI:10.1039/d2nj03404b
日期:——
A novel metal-free approach to the synthesis of a variety of 3-substituted-3-arylbenzofuran-2(3H)-ones is developed via H2SO4-mediated dehydrative substitution of 3-hydroxy-3-phenylbenzofuran-2(3H)-ones with electron-rich arenes/1,3-diones/alcohols/thiols as nucleophiles in moderate to good yields. Mechanistically, the substitution with the alkoxy group proceeds via a phenolic–hydroxyester intermediate
通过H 2 SO 4介导的3-羟基-3-苯基苯并呋喃-2( 3 H )-具有富电子芳烃/1,3-二酮/醇/硫醇作为亲核试剂,产率适中。从机理上讲,烷氧基的取代通过酚-羟基酯中间体进行,并通过级联脱水-再内酯化步骤形成所需的产物。
Peroxidation and Skeletal Rearrangement for the Synthesis of Dioxole‐2‐Carboxamide Derivatives under Continuous‐Flow Conditions
作者:Akash S. Ubale、Moseen A. Shaikh、Nirmala Mohanta、Boopathy Gnanaprakasam
DOI:10.1002/adsc.202300591
日期:2023.9.19
Herein, we report peroxidative dearomatization of 2-naphthol and C−H peroxidation of 3-arylbenzofuran-2-ones with 66–94% yield under catalyst-free conditions using continuous flow module. Besides, an approach for the synthesis of N-substituted-2-phenylbenzo[d][1,3]dioxole-2-carboxamide has been achieved via the skeletalrearrangement of peroxybenzofuranone using amines in the absence of catalyst under
在此,我们报道了使用连续流模块在无催化剂条件下进行 2-萘酚的过氧化脱芳构化和 3-芳基苯并呋喃-2-酮的 C−H 过氧化,产率达 66-94%。此外,在连续流动下,通过过氧苯并呋喃酮的骨架重排,在没有催化剂的情况下,实现了合成N-取代-2-苯基苯并[ d ][ 1,3 ]二氧杂环戊烯-2-甲酰胺的方法。机理研究表明,这种过氧化反应是在热解条件下通过自由基形成进行的。