acid-catalyzed [3+1+1] cycloaddition reaction between aliphatic isocyanides and azomethineylides generated in situ from aziridines, leading to pyrrolidine derivatives, has been developed. This reaction proceeds smoothly under mild conditions and can also be modified by employing aromatic isocyanides to generate four-membered heterocycles, azetidines, through a [3+1] cycloaddition reaction.
We developed an efficient method for synthesis of tetrafunctionalized 2-imidazolines using TfOH-catalyzed formal [3+2] cycloaddition of N-tosylaziridine dicarboxylates and nitriles. This is the first report of C-N bond cleavage of N-tosylaziridine dicarboxylates catalyzed by Brønsted acid and the reaction worked well over wide scope of substrates in good to excellent yields under mild conditions. The
Y(OTf)3-Catalyzed Diastereoselective [3+2] Cycloaddition of N-Tosylaziridines and Imines; Efficient Synthesis of Multisubstituted Imidazolidines
作者:Junliang Zhang、Xingxing Wu
DOI:10.1055/s-0031-1290816
日期:2012.7
Abstract An efficient Y(OTf)3-catalyzed generation of azomethine ylides from donor–acceptor aziridines and their [3+2] cycloaddition with imines was developed. The method provides facile access to multisubstituted imidazolidines, which have been extensively used in organic synthesis. Furthermore, a three-component reaction on a gram scale and an asymmetric variation were also developed in this work
Lewis Acid-catalyzed [3 + 2]Cyclo-addition of Alkynes with<i>N</i>-Tosyl-aziridines via Carbon–Carbon Bond Cleavage: Synthesis of Highly Substituted 3-Pyrrolines
作者:Lei Li、Junliang Zhang
DOI:10.1021/ol202603e
日期:2011.11.18
A novel, efficient, and highly regioselective Lewis acid-catalyzed [3 + 2] cycloaddition of alkynes with azomethine ylides, which are easily obtained from N-tosylaziridines via C–C bond heterolysis at room temperature was developed. Moderate enantioselectivity (70% ee) can be achieved by the application of the commercially available chiral Pybox 7 as the ligand.
Efficient Synthesis of Diarylmethylamines via Lewis Acid Catalyzed Friedel–Crafts Reactions of Donor–Acceptor Aziridines with N,N-Dialkylanilines
作者:Yerin Kim、Yong Il Kwon、Sung-Gon Kim
DOI:10.1055/s-0039-1690731
日期:2020.1
A method for efficient and mild synthesis of diarylmethylamine scaffold, via Lewis acidcatalyzed Friedel–Crafts reaction of donor–acceptor aziridines with N,N-dialkylanilines to afford a biologically important diarylmethylamine derivatives in high yields (up to 88%), is presented. This reaction is suitable for the synthesis of various diarylmethylamine derivatives and has a broad scope for electron-rich