in formal insertions into CHbonds, activated by phenyl or vinyl groups, or by O-substituents. Scope and limitations of the reaction were investigated. Yields of up to 84% were achieved in the most favorable cases. Yields were enhanced by electron-releasing substituents and decreased by steric hindrance. Aziridination competed with allylic insertion with olefinic substrates. The insertion reaction proceeded
Iodine-Catalyzed Aminosulfonation of Hydrocarbons by Imidoiodinanes. a Synthetic and Mechanistic Investigation
作者:Angus A. Lamar、Kenneth M. Nicholas
DOI:10.1021/jo1015213
日期:2010.11.19
benzylic and some aliphatic saturated and unsaturatedhydrocarbons by reaction with imido-iodinanes (PhI═NSO2Ar) is catalyzed by I2 under operationally simple and mild conditions. The first examples of 1,2-functionalization of unactivated C−H bonds using imido-iodinanes as aminating agents are reported. Mechanistic investigations, including Hammett analysis, kinetic isotope effects, a cyclopropane clock experiment
The [Rh-2(OAc)(4)]-catalyzed decomposition of NsN=IPh [N-(p-nitrobenzenesulfonyl)imino]phenyliodinane} in the presence of olefins affords aziridines in yields of up to 85%. The aziridination of cis-hex-2-ene and cis-beta- methylstyrene is stereospecific, but, cis-stilbene affords a 3:1 mixture of cis- and trans-aziridines in low yield. With chiral Rh(II) catalysts, optically active aziridines are formed having enantiomeric excesses of up to 73%. The NsN=IPh-[Rh-2(OAc)(4)] system is also efficient for the allylic amination of olefins and for insertion into CH bonds, activated by phenyl or oxygen substituents.