Divergent synthesis of flavones and flavanones from 2′-hydroxydihydrochalcones <i>via</i> palladium(<scp>ii</scp>)-catalyzed oxidative cyclization
作者:Seung Hwan Son、Yang Yil Cho、Hyung-Seok Yoo、Soo Jin Lee、Young Min Kim、Hyu Jeong Jang、Dong Hwan Kim、Jeong-Won Shin、Nam-Jung Kim
DOI:10.1039/d1ra01672e
日期:——
Divergent and versatile synthetic routes to flavones and flavanones via efficient Pd(II) catalysis are disclosed. These Pd(II) catalyses expediently provide a variety of flavones and flavanones from 2′-hydroxydihydrochalcones as common intermediates, depending on oxidants and additives, via discriminate oxidative cyclization sequences involving dehydrogenation, respectively, in a highly atom-economic
公开了通过有效的 Pd( II ) 催化合成黄酮和黄烷酮的不同且通用的合成路线。根据氧化剂和添加剂,这些 Pd( II ) 催化剂分别以高度原子经济的方式通过涉及脱氢的区分氧化环化序列,方便地从 2'-羟基二氢查耳酮中提供各种黄酮和黄烷酮作为常见的中间体。
A novel route to synthesis of flavones from salicylaldehyde and acetophenone derivatives
作者:Koneni V. Sashidhara、Manoj Kumar、Abdhesh Kumar
DOI:10.1016/j.tetlet.2012.02.108
日期:2012.5
Convenient, facile, and alternate synthesis of medicinally important flavones is reported. The 2-hydroxychalcones derived from condensation between acetophenones and salicylaldehyde, underwent oxidative cyclization on heating in the presence of catalytic iodine, generating diversified flavones under solvent-free conditions. Eleven compounds have been synthesized in good to excellent yields and their
Ionic liquid mediated Cu-catalyzed cascade oxa-Michael-oxidation: efficient synthesis of flavones under mild reaction conditions
作者:Zhiyun Du、Huifen Ng、Kun Zhang、Huaqiang Zeng、Jian Wang
DOI:10.1039/c1ob06209c
日期:——
Flavonoids are a class of natural products, found in a wide range of vascular plants and dietary components. Their low toxicity and extensive biological activities, including anti-cancer and anti-bacterial, have made them attractive candidates to serve as therapeutic agents for many diseases. Herein, we disclose a highly efficient synthetic method of CuI-catalyzed cascade oxa-Michael-oxidation, using chalcones as substrates, mediated by the ionic liquid [bmim][NTf2] at a low temperature. This efficient synthetic method has demonstrated high synthetic utility and can afford flavones in good to high yields (up to 98%).
Regioselective Hydrodehalogenation of Aromatic α‐ and β‐Halo carbonyl Compounds by CuI in Isopropanol
作者:Iram Parveen、Danish Khan、Naseem Ahmed
DOI:10.1002/ejoc.201801385
日期:2019.1.31
An efficient and regioselective hydrodehalogenation of aromatic α‐ and β‐halo carbonylcompounds has been developed using CuI in isopropanol under basic condition. This reaction system effectively reduces chloride, bromide and iodide groups and affords high yield (up to 97 %) as carbonylcompounds. The method is environmentally friendly and demonstrates excellent tolerance to a broad range of electronically
Green Synthesis of 6-[2-Aminothiazol-4-yl]-2-furylchromone
作者:Vinay Prabha Sharma、Rakesh Kumar
DOI:10.14233/ajchem.2014.16376
日期:——
Synthesis of 2-aminothiazoles through Hantzsch method involves the use of bromine. An 2-aminothiazole system 6-[2-aminothiazol-4-yl]-2-furylchromone has been synthesized green chemically from 6-chloroacetyl-2-furylchromone and 6-acetyl-2-furylchromone during present study. The structures of new compounds were elucidated on the basis of IR and PMR-spectra.