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
Dicarbofunctionalization of unactivated alkenes by palladium-catalyzed domino Heck/intermolecular direct hetero arylation with heteroarenes
作者:Km Ishu、Dharmendra Kumar、Naveen Kumar Maurya、Suman Yadav、Dhananjay Chaudhary、Malleswara Rao Kuram
DOI:10.1039/d1ob00195g
日期:——
A palladium-catalyzeddomino Heck/intermolecular direct hetero arylation sequence of unactivated alkenes was developed, providing 1,2,3-triazole containing bisheterocycles bearing all-carbon quaternary centers with yields of 25–90%. The protocol was extended to 1,3,4-oxadiazoles as well. The installed triazole was further exploited for late-stage functionalizations, and the mechanistic studies indicate
Based on the intramolecular Heck-type reaction, a convenient and efficient strategy to construct functionalized ynones by a palladium-catalyzed cascadeannulation reaction has been developed. This reaction possesses good functional group compatibility, a broad substrate scope, and high atom- and step-economy. Furthermore, this approach could also be extended to direct alkynylation that gave another
Nickel-Catalyzed Reductive Aryl Thiocarbonylation of Alkene via Thioester Group Transfer Strategy
作者:Yunxia Feng、Shimin Yang、Shen Zhao、Dao-Peng Zhang、Xinjin Li、Hui Liu、Yunhui Dong、Feng-Gang Sun
DOI:10.1021/acs.orglett.0c02091
日期:2020.9.4
Herein reported is a nickel-catalyzed reductive aryl thiocarbonylation of alkenevia thioester group transfer strategy by using simple and readily available thioesters. In contrast to traditional activation of weaker C(acyl)–S bond, the C(acyl)–C bond of thioester was selectively cleaved to enable this reaction under mild conditions. Furthermore, this approach features operational simplicity and broad
respect to data, studies have mainly focused on stereoconvergent reactions of racemic alkyl electrophiles. Here, we report an enantioselective cross-electrophile aryl-alkenylation reaction of unactivatedalkenes. This method provides access to a number of biologically important chiral molecules such as dihydrobenzofurans, indolines, and indanes. The incorporated alkenyl group is suitable for further