Photoinduced, Copper-Promoted Regio- and Stereoselective Decarboxylative Alkylation of α,β-Unsaturated Acids with Alkyl Iodides
作者:Chao Wang、Yingjie Lei、Mengzhun Guo、Qinyu Shang、Hong Liu、Zhaoqing Xu、Rui Wang
DOI:10.1021/acs.orglett.7b03289
日期:2017.12.1
The first example of UV light-induced, copper-catalyzed regio- and stereoselective decarboxylative coupling of α,β-unsaturated acids with alkyl iodides was reported. Under standard conditions, the 1°, 2°, and 3° alkyl iodides proceeded smoothly with the E-selective alkenes obtained in uniformly good yields and high stereoselectivities.
Stereoselective Rhodium-Catalyzed Isomerization of Stereoisomeric Mixtures of Arylalkenes
作者:Tao Li、Wanxiang Zhao、Hongxuan Yang、Wenke Dong、Wencan Wang
DOI:10.1055/s-0040-1707166
日期:2020.10
Abstract A new efficient method for the synthesis of a high ratio of E-alkenes from E/Z mixtures of alkenes with B2pin2 in the presence of a rhodium catalyst is described. This reaction features mild reaction conditions, broad functional group tolerance, and highly great application potential.
The first thioether elimination reaction utilizing a low-valent titanocene has been discovered. This reaction occurs under mild conditions and affords stereospecifically a variety of dienes and styrenes. Our data suggest that this new reaction involves an intermediate of dimerization of titanocene as the reactant responsible for this elimination.
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