Aromatic Nucleophilic Substitution of Halobenzenes with Amines under High Pressure
作者:Toshikazu Ibata、Yasushi Isogami、Jiro Toyoda
DOI:10.1246/bcsj.64.42
日期:1991.1
The nucleophilicsubstitutionreactions of aromatic halides having electron-attracting groups on ortho or para position with various primary and secondary amines were accelerated by highpressure to give the corresponding N-substituted anilines in high yields. The bulkiness of amines affects its reactivity to lower the yields of the products. Although the secondary amines are usually less reactive
Regular Trends in Nucleophilic Substitutions in 2-Alkylamino-4-chloronitrobenzenes
作者:N. V. Zotova、P. M. Kushakova、V. A. Kuznetsov、A. A. Rodin、A. V. Garabadzhiu
DOI:10.1007/s11178-005-0146-6
日期:2005.2
The effect of substituents in position 2 on the reactivity of 2-alkylamino-4-chloronitrobenzenes in nucleophilic substitution by N-nucleophiles of various character was studied.
Continuous Synthesis and Purification by Direct Coupling of a Flow Reactor with Simulated Moving-Bed Chromatography
作者:Alexander G. O'Brien、Zoltán Horváth、François Lévesque、Ju Weon Lee、Andreas Seidel-Morgenstern、Peter H. Seeberger
DOI:10.1002/anie.201202795
日期:2012.7.9
Continuoussynthesis meets continuouspurification to produce pure products from crude reaction mixtures. In the nucleophilic aromatic substitution of 2,4‐difluoronitrobenzene with morpholine the desired monosubstituted product can be continuously separated from the byproducts in a purity of over 99 % by coupling a flow reactor to a simulated moving bed (SMB) chromatography module (see scheme).
combined with quasi-continuous final-product purification to produce pure products from crude reaction mixtures. In the nucleophilic aromatic substitution of 2,4-difluoronitrobenzene with morpholine followed by a heterogeneous catalytic hydrogenation, the desired monosubstituted product can be continuously separated from the co- and by-products in a purity of over 99 % by coupling a flow reactor sequence