Lewis Acid Catalyzed SN2-Type Ring Opening of N-Activated Aziridines with Electron-Rich Arenes/Heteroarenes
摘要:
An efficient Lewis acid catalyzed S(N)2-type ring opening of substituted aziridines with electron-rich arenes/heteroarenes to provide substituted 2,2-diaryl/heteroarylethylamines in excellent yields and stereoselectivity (er, dr >99:1) is described.
Iron(MCP) Complexes Catalyze Aziridination with Olefins As Limiting Reagents
作者:Mina F. Shehata、Suraj K. Ayer、Jennifer L. Roizen
DOI:10.1021/acs.joc.8b00402
日期:2018.5.4
N′-dimethyl-N,N′-bis(2-pyridinylmethyl)cyclohexane-1,2-diamine- (MCP-) and 2-(1-[(pyridin-2-ylmethyl)pyrrolidin-2-yl]pyrrolidin-1-yl}methyl)pyridine-type (PDP-type) complexes. These catalysts affect styreneaziridination under mild conditions based on a limiting quantity of olefin substrate.
Enantioselective Synthesis of 4,5-Dihydropyrroles via Domino Ring-Opening Cyclization (DROC) of<i>N</i>-Activated Aziridines with Malononitrile
作者:Manas K. Ghorai、Deo Prakash Tiwari
DOI:10.1021/jo302815m
日期:2013.3.15
An efficient and practical strategy for the synthesis of highly functionalized racemic and non-racemic 4,5-dihydropyrroles via dominoring-opening cyclization (DROC) of activated aziridines with malononitrile in excellent yield and stereoselectivity is described. The reaction serves as a tool for the synthesis of a large variety of substituted 4,5-dihydropyrroles in enantiomerically pure forms.
A Highly Effective Cobalt Catalyst for Olefin Aziridination with Azides: Hydrogen Bonding Guided Catalyst Design
作者:Joshua V. Ruppel、Jess E. Jones、Chelsea A. Huff、Rajesh M. Kamble、Ying Chen、X. Peter Zhang
DOI:10.1021/ol800588p
日期:2008.5.1
[Co(P1)], which was designed on the basis of potential hydrogen-bonding interactions in the metal-nitrene intermediate, is a highly active aziridination catalyst with azides. [Co(P1)] can effectively aziridinate various aromatic olefins with arylsulfonyl azides under mild conditions, forming sulfonylated aziridines in excellent yields. The Co-based system enjoys several attributes associated with the relatively low cost of cobalt and the wide accessibility of arylsulfonyl azides. Furthermore, it generates stable dinitrogen as the only byproduct.
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.
Guo, Hongchao; Xu, Qihai; Kwon, Ohyun, Journal of the American Chemical Society, 2009, vol. 131, p. 6318 - 6319