Alkenyl (or aryl) iodide (or bromide) is readily reduced with CrCl2 is N,N-dimethylformamide at 25°C to gice the corresponding organochromium species which adds selectively to an aldehyde moiety without affecting the coexisting ketone or cyano group of the substrate.
Catalytic Enantioselective Hydroboration of Cyclopropenes
作者:Marina Rubina、Michael Rubin、Vladimir Gevorgyan
DOI:10.1021/ja034210y
日期:2003.6.1
2,2-Disubstituted cyclopropyl boronates have been synthesized with high degrees of diastereo- and enantioselectivity via the rhodium-catalyzed asymmetric hydroboration of 3,3-disubstituted cyclopropenes. A strong directing effect of ester and alkoxymethyl substituents has been demonstrated. The directing effect was found to be necessary in achieving high degrees of enantiomeric induction. Selected
Mild conversion of alkenyl boronic acids to alkenyl halides with halosuccinimides
作者:Nicos A. Petasis、Ilia A. Zavialov
DOI:10.1016/0040-4039(95)02262-7
日期:1996.1
Reaction of alkenylboronicacids with halosuccinimides (NIS, NBS or NCS) gives the corresponding alkenylhalides with the same geometry. This method is suitable for the synthesis of geometrically pure (E) and (Z) alkenylhalides, as well as 1,1- and 1,2-dihaloalkenes.
Hydrozirconation of alkynyl(phenyl)iodonium salts and stereoselective synthesis of (E )-trisubstituted olefins
作者:Xian Huang、Jun-Hua Wang、De-Yu Yang
DOI:10.1039/a900188c
日期:——
Hydrozirconation of alkynyl(phenyl)iodonium salts affords alkenylchlorozirconocenes with the Zr-C bond germinal to the iodonium moiety, and two subsequent substitution reactions proceed with retention of the configuration of the carbon-carbon double bond.
Cyclic Vinyl(aryl)iodonium Salts: Synthesis and Reactivity
作者:Konrad Kepski、Craig R. Rice、Wesley J. Moran
DOI:10.1021/acs.orglett.9b02540
日期:2019.9.6
A convenient, highly regioselective synthesis of five-membered cyclic vinyl(aryl)iodoniumsalts directly from β-iodostyrenes is presented. An X-ray crystal structure confirms the identity of these heterocycles. These λ3-iodanes can be converted rapidly into functionalized arylacetylenes by treatment with mild base or undergo SNV reactions with nonbasic nucleophiles.