Enantioselective Friedel−Crafts Alkylation of Indoles with Nitroalkenes Catalyzed by Bifunctional Tridentate Bis(oxazoline)−Zn(II) Complex
作者:Shao-Feng Lu、Da-Ming Du、Jiaxi Xu
DOI:10.1021/ol060586f
日期:2006.5.1
[reaction: see text] A more practical and efficient catalytic asymmetric Friedel-Craftsalkylation of indoles with nitroalkenes using bifunctional tridentate bis(oxazoline)-Zn(OTf)(2) as catalyst has been developed. Various types of the nitroalkylated indoles were obtained in excellent yields (85-99%) and high enantioselectivities (up to 98% ee).
1,1-Diamino-2-nitroethylenes as excellent hydrogen bond donor organocatalysts in the Michael addition of carbon-based nucleophiles to β-nitrostyrenes
作者:Rodrigo C. da Silva、Gustavo P. da Silva、Diego P. Sangi、João G. de M. Pontes、Antônio G. Ferreira、Arlene G. Corrêa、Márcio W. Paixão
DOI:10.1016/j.tet.2013.08.040
日期:2013.10
A new class of hydrogen bond donor catalysts based on the 1,1-diamino-2-nitreethylene scaffold has been introduced for the activation of trans-beta-nitrostyrenes toward reactions with a range of carbon-based nucleophiles, affording the corresponding adducts in excellent yields. Importantly, this new set of organocatalysts is easily prepared from commercially available starting materials in mild reaction conditions. (C) 2013 Elsevier Ltd. All rights reserved.
Tandem Catalytic Asymmetric Friedel-Crafts/Henry Reaction: Control of Three Contiguous Acyclic Stereocenters
作者:Takayoshi Arai、Naota Yokoyama
DOI:10.1002/anie.200801373
日期:2008.6.23
Montmorillonite K10–Catalyzed Michael Addition of Indoles to Nitroolefins Under Solvent-Free Conditions
作者:Wei-Yi Chen、Xin-Sheng Li
DOI:10.1080/00397910802632555
日期:2009.5.7
Montmorillonite K10 is a very inexpensive and readily available reagent and efficiently catalyzes the Michael addition of indoles to nitroolefins under solvent-free conditions. Reasonable to excellent yields of the desired products were obtained in most cases.