New Generation of Organosilyl Radicals by Photochemically Induced Homolytic Cleavage of Silicon−Boron Bonds
作者:Akira Matsumoto、Yoshihiko Ito
DOI:10.1021/jo000547w
日期:2000.9.1
wavelength than 300 nm, undergo photolysis to afford pairs of an organosilylradical and a bis(diisopropylamino)boryl radical by homolytic scission of the silicon-boron bonds. Generation of organosilylradical and organoboryl radical was confirmed by trapping experiments using TEMPO (2,2,6,6-tetramethylpiperidine N-oxyl). The organosilylradical thus generated induces not only silylation of mono-olefins
Intramolecular Cyclopropanation of Unsaturated Terminal Epoxides
作者:David M. Hodgson、Ying Kit Chung、Jean-Marc Paris
DOI:10.1021/ja047346k
日期:2004.7.1
Efficient lithium amide-induced intramolecular cyclopropanation of bishomoallylic and trishomoallylic epoxides is described. The methodology is used in an asymmetric synthesis of sabina ketone.
Stereoselective cyclomagnesiation of 1,6-heptadienes catalyzed by zirconocenes: Effects of substituents, solvent and magnesium reagents
作者:Ulrike Wischmeyer、Kyle S. Knight、Robert M. Waymouth
DOI:10.1016/0040-4039(93)88032-e
日期:1992.12
Zirconocene dichloride acts as a catalyst precursor for the stereoselective cyclomagnesiation of an array of substituted 1,6-heptadienes in the presence of butylmagnesium chloride to form trans 1,2-(bis)methylmagnesium substituted carbocycles.