A highly efficient method for the synthesis of 2-hydroxy-2,3-dihydrofuran derivatives from 1,4-enediones and phenacyl pyridinium halides via a domino reaction has been developed. This is a simple and beneficial strategy for the construction of 2-hydroxy-2,3-dihydrofuran compounds from readily available starting materials under mild conditions. Moreover, the application of this reaction provides a straightforward
Direct synthesis of 3,5‐diaryl‐1,2,
<scp>4‐oxadiazoles</scp>
using 1‐(2‐oxo‐2‐arylethyl)pyridin‐1‐iums with benzamidines
作者:Yue Zhang、Chengjun Wu、Xinyi Wan、Cunde Wang
DOI:10.1002/jhet.4354
日期:2021.12
An efficient domino protocol for the synthesis of 1,2,4-oxadiazole derivatives from readily available 1-(2-oxo-2-arylethyl)pyridin-1-iums and amidine hydrochlorides was developed. In this practical approach, N-acyl amidine precursors were formed firstly via a simple nucleophilic substitution, without the purification of N-acylamidine intermediates, and the following intramolecularly dehydrative cyclization
开发了一种用于从容易获得的 1-(2-oxo-2-arylethyl)pyridin-1-iums 和脒盐酸盐合成 1,2,4-恶二唑衍生物的有效多米诺协议。在该实用的方法,Ñ酰基脒前体通过简单的亲核取代首先形成,未经纯化Ñ -acylamidine中间体和分子内下列脱水闭环中的我的存在下,得到1,2,4-恶二唑衍生物2 / K 2 CO 3 /DMSO 表现出优异的官能团耐受性并在简单的实验条件下进行。
Facile Synthesis of Cyclometalated Ruthenium Complexes with Substituted Phenylpyridines
作者:Isabelle Sasaki、Laure Vendier、Alix Sournia‐Saquet、Pascal G. Lacroix
DOI:10.1002/ejic.200600359
日期:2006.8
We have developed a new strategy that uses the Krohnke synthesis for the preparation of various substituted phenylpyridines in excellent yields (up to 88 %). Starting with the appropriate commercially available acetophenone, a variety of phenylpyridines substituted by either electron-donating (i.e. methyl, methoxy) or -withdrawing groups (i.e. bromide, nitro) on the phenyl ring are obtained in a two-step
Acid-Catalyzed Condensation of o-Phenylenediammines and o-Aminophenols with α-Oxodithioesters: A Divergent and Regioselective Synthesis of 2-Methylthio-3-aryl/Heteroarylquinoxalines and 2-Acylbenzoxazoles
作者:Kuppalli R Kiran、Toreshettahally R Swaroop、Kodipura P Sukrutha、Jeegundipattana B Shruthi、Seegehally M Anil、Kanchugarakoppal S Rangappa、Maralinganadoddi P Sadashiva
DOI:10.1055/s-0039-1690616
日期:2019.11
Abstract o-Phenylenediammines and o-aminophenols were reacted with α-oxodithioesters in a highly regioselective fashion to give 2-methylthio-3-aryl/heteroarylquinoxalines and 2-acylbenzoxazoles in 55–94% and 45–86%, respectively, in the presence of p-toluene sulfonic acid catalyst. Control experiments involving reaction of aniline with a α-oxodithioester indicated that the thiocarbonyl group is more
Iodine-promoted synthesis of acylindolizine derivatives from acetylenecarboxylates and pyridinium, isoquinolinium, or quinolinium ylides
作者:Juanjuan Liu、Peiyun Yan、Yan Li、Zhengquan Zhou、Weijian Ye、Juan Yao、Cunde Wang
DOI:10.1007/s00706-013-1120-6
日期:2014.4
AbstractAn iodine-promoted synthesis of acylindolizinecarboxylates via 1,3-dipolar cycloaddition of nitrogen ylides with acetylenecarboxylates and subsequent aromatization for the generation of a wide range of structurally interesting, pharmacologically and photoelectrically significant compounds is reported. Only readily available materials, mild conditions, and operationally trivial reaction protocols