Electrochemical Aziridination by Alkene Activation Using a Sulfamate as the Nitrogen Source
作者:Jin Li、Wenhao Huang、Jingzhi Chen、Lingfeng He、Xu Cheng、Guigen Li
DOI:10.1002/anie.201801106
日期:2018.5.14
direct aziridination of triaryl‐substituted alkenes was achieved by means of an electrochemical process that could extend to multisubstituted styrenes. Specifically, hexafluoroisopropanol sulfamate was used as a nucleophilic nitrogen source. Mechanistic experiments suggest that this electrochemical process proceeds by stepwise formation of two C−N bonds through reactions between cationic carbon species
A Novel Photochemical Vinylcyclopropane Rearrangement Yielding 6,7-Dihydro-5<i>H</i>-benzocycloheptene Derivatives
作者:Diego Armesto、Ana Ramos、Elena P. Mayoral、Maria J. Ortiz、Antonia R. Agarrabeitia
DOI:10.1021/ol991277a
日期:2000.1.1
[reaction: see text] 1-Substituted 1-(2,2-diphenylvinyl)cyclopropanes with electron-accepting groups at C1 undergo a novelrearrangement to benzocycloheptenes on triplet-sensitized irradiation. In some instances competition between rearrangement to cyclopentenes and formation of cycloheptenes takes place. When electron-acceptor groups are not present at C1, conventional ring opening to cyclopentenes
N-tosylhydrazones has been developed. In the presence of copper(I) iodide and base, H-phosphonates react with N-tosylhydrazones to afford the corresponding coupled alkylphosphonates in good to excellent yields without any ligands. Alkylphosphonates can also be prepared in a one-pot process directly from carbonyl compounds without the isolation of tosylhydrazone intermediates.