H-Y zeolite is a versatile heterogeneous catalyst for the synthesis of β-nitroamines
Heterogeneous aza-Henry reactions of aldimes with nitromethane were examined with zeolites as catalysts. Among the zeolite used, H-Y zeolite showed satisfactory catalytic activity for various aldimines, resulting in corresponding β-nitroamines in good yields. H-Y zeolite also showed the excellent reusability until the 3rd usage without loss of its activity; further, the calcination of deactivated H-Y zeolite allowed it to rejuvenate its catalytic activity. Solid-state 13C MAS NMR revealed the predominant activation of an aldimine into the H-Y zeolite.
Synthesis of aza-Henry products and enamines in water by Michael addition of amines or thiols to activated unsaturated compounds
Nitroamines and nitrothiols were synthesized in high yields by the Michael addition of amines and thiols to nitroolefins without using any catalyst. Also, the reaction of amines with dimethylacetylene dicarboxylate (DMAD) in water afforded the corresponding enamines.
Ziyaei-Halimehjani, Azim,Saidi, Mohammad R.
p. 1244 - 1248
(2008/09/17)
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