Sulfonium ylide formation and subsequent C S bond cleavage of aromatic isopropyl sulfide catalyzed by hemin in aqueous solvent
作者:Xiaojing Yan、Chang Li、Xiaofei Xu、Quan He、Xiaoyong Zhao、Yuanjiang Pan
DOI:10.1016/j.tet.2019.04.035
日期:2019.6
Heme is an abundant and widely existed cofactor for a variety of metalloenzymes, whose broader use is generally impeded by its high instability and poor solubility. Here we report an environment-benign and efficient strategy for the sulfonium ylide formation and subsequent CS bondcleavage of aromatic isopropyl sulfides, which was catalyzed by hemin in assistance of Triton X-100. This aqueous catalytic
Highly Chemo- and Stereoselective Intermolecular Coupling of Diazoacetates To Givecis-Olefins by Using Grubbs Second-Generation Catalyst
作者:David M. Hodgson、Deepshikha Angrish
DOI:10.1002/chem.200601692
日期:2007.4.16
Highly stereoselective formation of cis-2-ene-1,4-diesters by homo- and heterocoupling of alpha-diazoacetates in the presence of Grubbs second-generation catalyst is demonstrated. The dual reactivity of the catalyst in alkene metathesis and diazocoupling has been exploited in the synthesis of 12-26-membered macrocyclic dienyl dilactones by one-pot carbene dimerisation/ring-closing metathesis.
Regioselective Synthesis of <i>N</i>-Vinyl Pyrazoles from Vinyl Sulfonium Salts with Diazo Compounds
作者:Shichong Wang、Huayan Xu、Ruoyu Zhang、Siyu Zhang、Yun Chai、Bingchuan Yang、Jingjing Zhao、Yuanqing Xu、Pan Li
DOI:10.1021/acs.orglett.3c02653
日期:2023.9.15
regioselective synthesis of N-vinyl pyrazoles fromvinyl sulfonium salts with diazo compounds. This metal-free synthetic protocol provides an efficient and practical approach to diverse N-vinyl pyrazoles in good to excellent yields under mild conditions. The reaction appears to experience a [3 + 2] annulation of vinyl sulfonium salts and diazo anions rather than diazo compounds, followed by N-vinylation.