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An efficient protocol was developed for the recyclable nano CuO powder catalyzed synthesis of quinoline derivatives from acetylenedicarboxylates and 2-aminocarbonyl compounds using acetonitrile as solvent at 40 C in air. A variety of quinoline derivatives were synthesized in good yields with good chemoselectivity in the presence of a catalytic amount of CuO nano powder under ligand/additive free conditions. The catalyst is air-stable, inexpensive and recyclable up to four cycles.

An efficient, highly versatile and simple protocol was developed for the synthesis of xanthones and thio-xanthones via an intermolecular catalytic coupling of 2-substituted benzaldehydes and various phenols under ligand free conditions by using nano-CuFe 2 O 4 as a catalyst and K 3 PO 4 as a base in DMF sol-vent at 80 0 C in air. The reaction proceeds smoothly with a wide range of starting materials and furthermore, the explored copper ferrite catalyst is air-stable, inexpensive, magnetically separated, recyclable and reusable up to four cycles.

A simple, efficient and novel methodology has been developed for the synthesis of substituted furans mediated by triflic acid. In the reaction initial step involves the Friedel–Crafts arylation, followed by the dehydrative cyclization.

Highly efficient and facile methodology has been developed for the ring opening reaction of spiro‐epoxy oxindoles with electron rich arenes in presence of molecular iodine. These reactions can be carried out easily under mild reaction conditions to afford functionalized 2‐indolinone derivatives in excellent yields.

Recyclable Nano Copper Oxide Catalyzed Synthesis of Quinoline-2,3-dicarboxylates under Ligand Free Conditions. -16 Title compounds are prepared using CuO nanoparticles as catalyst. The catalyst can be used four times with only a slight loss in activity. -(VENKANNA, A.; SWAPNA, K.; RAO*, P. V.; RSC Adv. 4 (2014) 29, 15154-15160, http://dx.doi.org/10.1039/c3ra47212d ; Dep. Chem., Nizam Coll., Osmania Univ., Hyderabad 500 001, India; Eng.) -M. Bohle 48-154

A broad spectrum of substituted phenols and thiophenol (IVb) can be used in the title reaction with o‐substituted benzaldehydes.

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