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ZnO-beta zeolite, an inexpensive and mild catalyst, has been used for the synthesis of polyhydroquinolines in excellent yields from the one-pot four-component condensation of aldehydes, dimedone, ethyl acetoacetate, and ammonium acetate in ethanol at room temperature. The remarkable advantages offered by this method are a green catalyst, mild reaction conditions, simple work-up procedures, much faster reactions, and excellent yield of products. Furthermore, the catalyst could be reused several times keeping its initial activity in recycled reactions.

Abstract:A rapid and an efficient one-pot method for the synthesis of quinoxalines catalysed by ZnO-beta zeolite at room temperature is described. This environmentally benign method provides several advantages over methods that are currently employed such as asimplework-up,mildreactionconditions,goodtoexcellentyields,andaprocesstorecoverandreusethecatalystforseveralcycles withconsistentactivity. © Versita Sp. z o.o.

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on Silica as a Nitrating System. -The reported methodology shows a considerable enhancement in the reaction rate along with a high ortho-selectivity, excellent yields and ease of operation. -(PATIL, M. R.; MOHITE, P. H.; SHISODIA, S.; KERI*, R. S.; Lett. Org. Chem. 12 (2015) 2, 129-135, http://dx.doi.org/10.2174/1570178612666150108000402 ; Cent. Nano Mater Sci., Jain Univ., Bangalore 562 112, India; Eng.) -A. Forchert 30-099