Pd-Catalyzed Highly Regio- and Stereoselective Formation of C–C Double Bonds: An Efficient Method for the Synthesis of Benzofuran-, Dihydrobenzofuran-, and Indoline-Containing Alkenes
A highly regio- and stereoselective C–C double bond formation reactionvia Pd-catalyzed Heck-type cascade process with N-tosylhydrazones has been developed. Various N-tosylhydrazones derived from both ketones and aldehydes are found to be efficient substrates to provide di- and trisubstitutedolefins with high regio- and stereoselectivity. Furthermore, this reaction has a good functional group tolerance
Insertion Reaction of 2-Halo-N-allylanilines with K2S Involving Trisulfur Radical Anion: Synthesis of Benzothiazole Derivatives under Transition-Metal-Free Conditions
benzothiazole derivatives through the reaction of 2-halo-N-allylanilines with K2S in DMF is developed. The trisulfur radical anion S3·–, which is generated in situ from K2S in DMF, initiates the reaction without transition-metal catalysis or other additives. In addition, two C–S bonds are formed and heteroaromatization of benzothiazole is triggered by radical cyclization and H-shift.
cyclizative cross-coupling reactions have attracted enormous attention due to their unique cascade nature. We demonstrated, herein, a dual-cyclizative coupling of ynone oxime ethers with acrylamides for the synthesis of methylene-linked isoxazolyl 2-oxindoles. The cascade was triggered by a palladium(II)-catalyzed ynone oxime ether cyclization, which underwent a Heck-type coupling intercepted by an aryl iodide
金属催化的环化交叉偶联反应由于其独特的级联性质而引起了极大的关注。我们在此展示了 ynone 肟醚与丙烯酰胺的双环化偶联,用于合成亚甲基连接的异恶唑基 2-羟吲哚。级联反应由钯 ( II ) 催化的炔酮肟醚环化引发,该环化经历了被芳基碘插入物拦截的 Heck 型偶联。进行对照实验以了解机理。
Microwave-Assisted Domino Heck Cyclization and Phosphorylation: Synthesis of Phosphorus Containing Heterocycles
作者:Karu Ramesh、Gedu Satyanarayana
DOI:10.1002/ejoc.201900510
日期:2019.6.30
A domino [Pd]‐catalyzed intramolecular Heck cyclization followed by intermolecular phosphorylation, for the construction of phosphorus containing heterocycliccompounds, is presented. Notably, the process is accelerated by microwave heating conditions and enabled the construction of C−C and C−P bonds in short reaction times.
Nickel-Catalyzed Reductive Cascade Arylalkylation of Alkenes with Alkylpyridinium Salts
作者:Jun Yang、Lina Yang、Jing Gu、Li Shuai、Hui Wang、Qin Ouyang、Yu-Long Li、Haibin Liu、Liang Gong
DOI:10.1021/acs.orglett.2c00599
日期:2022.4.1
Herein, we describe a nickel-catalyzed reductive deaminative arylalkylation of tethered alkenes with pyridinium salts as C(sp3) electrophiles. This two-component dicarbofunctionalization reaction enables the efficient synthesis of various benzene-fused cyclic compounds bearing all-carbon quaternary centers. The approach presented in this paper proceeds under mild conditions, tolerating a wide variety