Achieving Vinylic Selectivity in Mizoroki-Heck Reaction of Cyclic Olefins
作者:Xiaojin Wu、Yunpeng Lu、Hajime Hirao、Jianrong Steve Zhou
DOI:10.1002/chem.201204427
日期:2013.5.3
In Heck reactions of cyclicolefins, the products usually have aryl groups that end up at the allylic and/or homoallylic position. We herein report new selectivity that adds aryl groups to the vinylic position. Cyclicolefins of various ring size worked well. The desired isomers were produced by palladium–hydride‐catalyzed isomerization of the initial products. Thus, a specific catalyst must be used
Vinyl azides in heterocyclic synthesis. Part 4. Thermal and photochemical decomposition of azidocinnamates containing ortho-cycloalkenyl substituents
作者:Christopher J. Moody、Graham J. Warrellow
DOI:10.1039/p19860001123
日期:——
Thermolysis of azidocinnamates containing ortho-cycloalkenyl substituents leads to isoquinolines and benzazepines formed by interception of the azide, or derived vinylnitrene, by the neighbouring double bond, the stability of the azide varying with the ring size of the cyclic alkene substituent. The cycloheptenyl (1a) and cyclopentenyl (1c) azidesdecompose at room temperature by intramolecular cycloaddition