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
Synthesis of Multisubstituted Allenes via Nickel-Catalyzed Cross-Electrophile Coupling
作者:Youxiang Jin、Hao Wen、Feiyan Yang、Decai Ding、Chuan Wang
DOI:10.1021/acscatal.1c04143
日期:2021.11.5
context, we report the successful application of a cross-electrophile strategy in the synthesis of multisubstituted allenes. Under the catalysis of nickel, reductive cross-couplingbetween propargyl carbonates and organoiodides provides an entry to prepare tri- or tetrasubstituted allenes without employing any pregenerated organometallics. Furthermore, propargyl carbonates also prove to be suitable allenylating
A palladium-catalyzed carbothiolation via the reaction of a σ-alkyl palladium intermediate with a TIPS thioether is described. It was found that the use of Cs2CO3, (IPr)Pd(allyl)Cl, and a TIPS thioether was key to obtaining alkyl aryl and dialkyl sulfides in high yield through the reaction of a σ-alkyl palladium intermediate. The developed reaction is applicable to a wide range of substrates and thiols
描述了通过σ-烷基钯中间体与TIPS硫醚反应的钯催化的羰基硫醇化。发现使用Cs 2 CO 3,(IPr)Pd(烯丙基)Cl和TIPS硫醚是通过σ-烷基钯中间体反应以高收率获得烷基芳基和二烷基硫化物的关键。所开发的反应适用于多种底物和硫醇。
Palladium-Catalyzed Carboacylation of Alkenes by Using Acylchromates as Acyl Donors
作者:Motoki Yamane、Yuko Kubota、Koichi Narasaka
DOI:10.1246/bcsj.78.331
日期:2005.2
Palladium-catalyzed arylacylation of alkenes proceeds by employing acylchromates as acyl donors. When active alkenes such as norbornene and methoxyallene are treated with an aryl iodide, an acylchromate, and a catalytic amount of Pd(OAc)2/2P(o-Tol)3, arylacylation of these alkenes proceeds at room temperature. From aryl iodides having an intramolecular alkene moiety, cyclization–acylation products are obtained via intramolecular arylpalladation followed by acylation with acylchromates.