Palladium-catalyzed hydroalkylation of methylenecyclopropanes with simple hydrazones
作者:Jinzhong Yao、Zhangpei Chen、Lin Yu、Leiyang Lv、Dawei Cao、Chao-Jun Li
DOI:10.1039/d0sc01221a
日期:——
A palladium-catalyzed hydroalkylation reaction of methylenecyclopropanes via highly selective C–C σ-bond scission was achieved under mild conditions, in which simple hydrazones served as carbanion equivalents. This method featured good functional group compatibility, affording high yields of C-alkylated terminal alkenes.
Acylation of Alkylidenecyclopropanes for the Facile Synthesis of α,β-Unsaturated Ketone and Benzofulvene Derivatives with High Stereoselectivity
作者:Xian Huang、Yewei Yang
DOI:10.1021/ol070331h
日期:2007.4.1
[reaction: see text] A variety of substituted alpha,beta-unsaturated ketone and benzofulvene derivatives were readily prepared in good to excellent yields via the reaction of alkylidenecyclopropanes with various acyl chlorides in the presence of aluminum chloride. The stereochemistry of the acylation and cyclization is discussed.
Intramolecular Cycloisomerization of Aryl-Substituted Alkylidenecyclopropanes via NHC Palladium-Catalyzed Cascade C-C Bond Cleavage/C-H Activation/C-C Bond Formation
作者:Xian Huang、Yewei Yang
DOI:10.1055/s-2008-1078404
日期:2008.5
A well-defined N-heterocyclic carbene (NHC) palladium-catalyzed intramolecular cyclization reaction of aryl-substituted alkylidenecyclopropanes (ACP) to 1-aryl dihydronaphthalenes is described. The NHC salts were found to suppress β-hydride elimination from the homoallylpalladium intermediate, which may lead to unwanted alkene formation. A plausible mechanism for the cycloisomerization was proposed.
Selective Access to Silacyclopentanes and Homoallylsilanes by La-Catalyzed Hydrosilylations of 1-Aryl Methylenecyclopropanes
作者:Xiaoming Xu、Ailin Gao、Xiufang Xu、Jianfeng Li、Chunming Cui
DOI:10.1021/jacs.3c12355
日期:2024.2.14
their unique reactivity. However, metal-catalyzed hydrosilylation of MCPs has met with very limited successes. In this paper, catalytic selective hydrosilylations of MCPs with some primary silanes using an ene-diamido lanthanum ate complex as the catalyst were described. The catalytic reactions resulted in the selective formation of silacyclopentanes and (E)-homoallylsilanes, respectively, depending on