stereoselective synthesis of a variety of β-nitro-α-amino carboxylic acidsvia aza-Henry (nitro-Mannich) reaction of aldimines is disclosed, yielding either anti- or a rarely reported syn-configuration. The reaction operates directly on free glyoxylic acid and generates imine species in situ. Crystallization-controlled diastereoselectivity enables isolation of the target compounds in high enantio- and diastereomeric
A New Preparation of Aliphatic Nitro Compounds by S<sub>H</sub>2′ Reactions of<i>gem</i>-Halo Nitro Compounds with Allyltributylstannane
作者:Noboru Ono、Klaus Zinsmeister、Aritsune Kaji
DOI:10.1246/bcsj.58.1069
日期:1985.3
α-Nitroalkyl radicals generated from gem-halo nitro compounds are reactive enough to undergo the carbon–carbon bond forming reaction with allyltributylstannane via radical chain processes, which provides a new method for the introduction of an allyl group into nitroalkanes.
Benzylation of Nitroalkanes Using Copper-Catalyzed Thermal Redox Catalysis: Toward the Facile C-Alkylation of Nitroalkanes
作者:Peter G. Gildner、Amber A. S. Gietter、Di Cui、Donald A. Watson
DOI:10.1021/ja304561c
日期:2012.6.20
The C-alkylation of nitroalkanes under mild conditions has been a significant challenge in organic synthesis for more than a century. Herein we report a simple Cu(I) catalyst, generated in situ, that is highly effective for C-benzylation of nitroalkanes using abundant benzyl bromides and related heteroaromatic compounds. This process, which we believe proceeds via a thermal redox mechanism, allows
Efficient Docking–Migration Strategy for Selective Radical Difluoromethylation of Alkenes
作者:Jiajia Yu、Zhen Wu、Chen Zhu
DOI:10.1002/anie.201811346
日期:2018.12.21
Radical‐mediated difunctionalization of alkenes is a powerful tactic for olefin utilization. However, the transformation of unactivated alkenes still remains a formidable challenge. Now a conceptually new docking–migration strategy is presented for the difunctionalization of alkenes with photoredox catalysis. Both activated and unactivated alkenes are suitable substrates. A vast array of functional
Kinetic Diastereomer Differentiation in Au(III)- and Bi(III)-Catalyzed Benzylic Arylation: Concise and Stereocontrolled Synthesis of 2-Amino-1,1-diarylalkanes
作者:Etienne Chénard、Stephen Hanessian
DOI:10.1021/ol500902p
日期:2014.5.16
stereoselective reactions catalyzed by Brønsted and Lewis acids. Gold(III) chloride and bismuth(III) triflate were found to be especially efficient as catalysts, showing kinetically controlled differentiation in the reactivity of diastereomeric α-substituted benzyl alcohols. Applications to therapeutically relevant syn- and anti- 2-amino-1,1-diarylalkanes are projected.