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.
A Highly Effective Cobalt Catalyst for Olefin Aziridination with Azides: Hydrogen Bonding Guided Catalyst Design
摘要:
[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.
Imido Transfer from Bis(imido)ruthenium(VI) Porphyrins to Hydrocarbons: Effect of Imido Substituents, C−H Bond Dissociation Energies, and Ru<sup>VI/V</sup> Reduction Potentials
(BDE) of the hydrocarbons. A linear correlation was observed between log k' (k' is the k2 value divided by the number of reactive hydrogens) and BDE and between log k2 and E(1/2)(Ru(VI/V)); the linearity in the former case supports a H-atom abstraction mechanism. The amidation by [Ru(VI)(TMP)(NNs)2] reverses the thermodynamic reactivity order cumene > ethylbenzene/toluene, with k'(tertiary C-H)/k'(secondary
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.
Phosphine-promoted [4 + 3] annulation of allenoate with aziridines for synthesis of tetrahydroazepines: phosphine-dependent [3 + 3] and [4 + 3] pathways
In this manuscript, phosphine-dependent [3 + 3] and [4 + 3] annulation reactions of allenoate with aziridines were disclosed. The alkyldiphenylphosphine-promoted [4 + 3] annulation of allenoate with aziridines has been achieved under mild conditions, providing biologically interesting functionalized tetrahydroazepines in moderate to excellent yield with moderate to excellent regioselectivity and diastereoselectivity
Guo, Hongchao; Xu, Qihai; Kwon, Ohyun, Journal of the American Chemical Society, 2009, vol. 131, p. 6318 - 6319
作者:Guo, Hongchao、Xu, Qihai、Kwon, Ohyun
DOI:——
日期:——
Metal Porphyrin Catalyzed Olefin Aziridination with Sulfonyl Azides
申请人:Zhang X. Peter
公开号:US20110112288A1
公开(公告)日:2011-05-12
Cobalt(II) complex of P1 [Co(P1)], a new porphyrin that was designed on the basis of potential hydrogen bonding interactions in the metal-nitrene intermediate, is a highly active catalyst for olefin aziridination with azides. The [Co(P1)]-based system can be effectively employed for different combinations of aromatic olefins and arysulfonyl azides, synthesizing various sulfonylated aziridines in excellent yields. Besides its mild catalytic conditions, the Co-catalyzed aziridination process enjoys several attributes associated with the relatively low cost of cobalt and widely accessible arylsulfonyl azides. Furthermore, it generates stable dinitrogen as the only by-product.