Nitrene Transfer Reactions Catalyzed by Gold Complexes
作者:Zigang Li、Xiangyu Ding、Chuan He
DOI:10.1021/jo060016t
日期:2006.8.1
We report here the first gold-catalyzed nitrenetransferreaction. A gold(I) compound, supported by 4,4‘,4‘ ‘-tri-tert-butyl-2,2‘:6‘,2‘ ‘-terpyridine (tBu3tpy) as the ligand, efficiently catalyzes olefin aziridination with the use of the commercially available oxidant PhI(OAc)2 and sulfonamides. This system also mediates carbene insertion into benzene.
我们在这里报告了第一个金催化的腈转移反应。由4,4',4''-三叔丁基-2,2':6',2'-叔吡啶(t Bu 3 tpy)担载的金(I)化合物有效催化烯烃使用可商购的氧化剂PhI(OAc)2和磺酰胺进行叠氮化。该系统还介导卡宾插入苯中。
A method for rhodium(II)-catalyzed aziridination of olefins
作者:Paul Müller、Corine Baud、Yvan Jacquier
DOI:10.1016/0040-4020(95)00999-x
日期:1996.1
decomposition of (N-(p-nitrobenzenesulfonyl)imino)phenyliodinane (PhINNs) in the presence of olefins affords aziridines in yields of 18–85%. The aziridination of cis-β- methylstyrene (1h) and cis-hex-2-ene (1k) is stereospecific. However, with cis-stilbene (1m) a ca. 3:1 mixture of cis- and trans aziridines 2m and 21 is obtained. With chiral catalysts asymmetric inductions in up to 73% ee are obtained
The rhodium(II)-catalyzed aziridination of olefins with {[(4-nitrophenyl)sulfonyl]imino}phenyl-lambda<sup>3</sup>-iodane
作者:Paul Müller、Corine Baud、Yvan Jacquier
DOI:10.1139/cjc-76-6-738
日期:——
The aziridination of olefins with (4-nitrophenylsulfonyl)imino)phenyl-lambda(3)-iodane, NsN=IPh (1c), in the presence of [Rh-2(OAc)(4)] proceeds in yields of up to 85% when the olefin is used in large excess. Under optimized conditions, styrene (4a) is aziridinated with 1 equiv. of NsN=IPh (1c) in 64% yield with 2 mol% of catalyst. The aziridines derived from electron-rich olefins undergo ring-opening under the conditions of the aziridination and afford rearrangement products or pyrrolidines. The aziridination is sterospecific with 1,2-dialkyl- and 1,2-arylalkyl-disubstituted olefins, but nonstereospecific with stilbene. The rho-value for aziridination of substituted styrenes is -0.61. No ring-opened products are observed upon aziridination of vinylcyclopropanes. Tn the presence of chiral Rh-II catalysts, the aziridination is enantioselective, affording an ee of 73% with cis-beta-methylstyrene (4k) and Pirrungs [Rh-2(R)-(-)-bnp}(4)] catalyst. The experimental results are consistent with a one-step mechanism for transfer of the nitrenoid moiety from the catalyst to the olefin.
Rhodium(II)-catalyzed aziridinations and CH insertions with [N-(p-nitrobenzenesulfonyl)imino]phenyliodinane
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.
Readily available nitrene precursors increase the scope of Evans' asymmetric aziridination of olefins
作者:Mikael J. Södergren、Diego A. Alonso、Pher G. Andersson
DOI:10.1016/s0957-4166(97)00496-5
日期:1997.11
The performance of the copper-catalyzed asymmetric aziridination of olefins is highly dependent on the properties of the nitrene precursor. Our preliminary results show significant improvements of both enantioselectivity and chemical yields when [N-(4-nitrobenzenesulfonyl)imino] phenyliodinane 1b (p-NO2C6H4SO2N=IPh) is employed instead of the commonly used p-tolyl analog 1a (PhI=NTs). This paper reports the comparison of some nitrene precursors for the copper-catalyzed asymmetric aziridination of olefins, utilizing the olefin as the limiting component and 1.5 equivalents of the nitrene precursor. The aziridine derivatives of several olefins were obtained in moderate to excellent yields and with enantioselectivity up to 95% ee. (C) 1997 Elsevier Science Ltd.