Aldehyde Olefination with Arylboroxines Enabled by Binary Rhodium Catalysis
作者:Zihao Zhang、Jie Jia、Fangdong Hu、Ying Xia
DOI:10.1021/acs.orglett.3c00916
日期:2023.5.12
olefination of aliphatic aldehydes with arylboroxines is described. The simple rhodium(I) complex [Rh(cod)OH]2 without any external ligands or additives is able to catalyze the reaction in air and neutral conditions, allowing the construction of aryl olefins in an efficient manner with a good functional group tolerance. The mechanistic investigation illustrates that the binary rhodium catalysis is the key
Rhodium‐Catalyzed Regio‐ and Diastereoselective [3+2] Cycloaddition of <i>gem</i>‐Difluorinated Cyclopropanes with Internal Olefins
作者:Yaxin Zeng、Ying Xia
DOI:10.1002/anie.202307129
日期:2023.8.7
A rhodium-catalyzed [3+2] cycloaddition reaction between readily available gem-difluorinated cyclopropanes and internal olefins has been developed, providing a wide range of multisubstituted gem-difluorinated cyclopentanes. This reaction shows an example where the “CF2” motif can be kept upon ring extension. The process is atom-economic and allows to reach numerous gem-difluorinated cyclopentanes with
Arylation and vinylation of 2-carboethoxyethylzinc iodide and 3-carboethoxypropylzinc iodide catalyzed by palladium
作者:Y. Tamaru、H. Ochiai、T. Nakamura、Z. Yoshida
DOI:10.1016/s0040-4039(00)84147-7
日期:——
Synthesis of the Multisubstituted Halogenated Olefins via Cross-Coupling of Dihaloalkenes with Alkylzinc Bromides
作者:Daniela Andrei、Stanislaw F. Wnuk
DOI:10.1021/jo051980e
日期:2006.1.1
The 1-fluoro-1-haloalkenes undergo Pd-catalyzed Negishi cross-couplings with primary alkylzinc bromides to give multisubstituted fluoroalkenes. The alkylation was trans-selective giving pure Z-fluoroalkenes in most cases. The highest yields were obtained with Pd-2(dba)(3) and PdCl2(dppb) catalysts but the best stereochemical outcome was obtained with less reactive Pd(PPh3)(4). The tertiary alkylzincs also produced desired fluoroalkenes in high yields. Coupling of beta,beta-dichloro styrene with organozinc reagent resulted in the formation of monocoupled product.
Alkyl-alkenyl cross coupling via alkyl cobaloxime radical chemistry.An alkyl equivalent to the heck reaction compatible with common organic functional groups
作者:Bruce P. Branchaud、Mark S. Meier、Youngshin Choi