Stereoselective sonochemical reductive silylation of geminal dibromocyclopropanes by bulk magnesium
作者:Jonathan Touster、Albert J. Fry
DOI:10.1016/s0040-4039(97)01453-6
日期:1997.9
trimethysilyl chloride and a bicyclic 1,1-dibromocyclopropane in the presence of bulk magnesium affords 1-trimethylsilyl-1-bromocyclopropanes in 72–93% yield. The sonochemical reactions proceed stereoselectively to afford as the major product the product in which the trimethylsilyl group is cis to the hydrogen atoms at the ring juncture.
On the stereoselectivity of iodocarbene and -carbenoid additions to cyclic alkenes
作者:Eckehard V. Dehmlow、Jörg Stütten
DOI:10.1016/0040-4039(91)80764-w
日期:1991.10
Exclusive formation of endo adducts 3d-f, 9, 10, 11 is observed in both carbene and carbenoid CHI additions with eight to twelve membered-ring alkenes. Cyclopentene, in contrast, gives exo compound 4a as only isolable product, whereas cyclohexene and cycloheptene yield both types of product. :CHBr (from HCBr3 and NaN(SiMe3)2) exhibits similar although less pronounced trends: only cyclodecene and cyclododecene lead to pure endo adducts 7e,f.
Sydnes,L.K.; Skattebol,L., Acta chemica Scandinavica. Series B: Organic chemistry and biochemistry, 1978, vol. 32, p. 632 - 638
作者:Sydnes,L.K.、Skattebol,L.
DOI:——
日期:——
Reduction of gem-dibromides with diethyl phosphite
Reaction of cyclopropylcarbene–metal complexes with nucleophiles, halogens and HX
作者:Margaret D. Reid、Liz Tirado、Jianwei Zhang、Nwamara Dike、James W. Herndon
DOI:10.1016/j.jorganchem.2005.07.044
日期:2005.12
The reaction of halogens, pseudohalogens, and HX with cyclopropyl(phenylthio)carbene-chromium complexes leads to the formation of 1,4-dihalo-1-thiophenyl-1-butene systems with a moderate-high degree of stereocontrol in the formation of the alkene. A mechanism involving electrophilic activation of the carbene complex followed by nucleophilic attack at the cyclopropane carbon has been proposed.