p-Toluenesulfonic acid monohydrate (p-TsOHÁ H 2 O) is a highly effective and efficient catalyst for the onepot multicomponent coupling of aldehydes, amines, and b-ketoesters in EtOH at ambient temperature to give highly functionalized piperidines in high yields. This one-pot reaction has some important advantages such as the easy workup procedure, simple and readily available precursors, nontoxic and inexpensive catalyst, and good to high yields.

The catalytic effects of two forms of nano‐TiO2, which are prepared via an ordinary or a magnetized process, are investigated in the synthesis of pyridine dicarbonitriles by one‐pot multicomponent reaction of 4‐methyl thiophenol, malononitrile, and aryl aldehydes. The results have shown that both prepared nano‐TiO2 exhibited high catalytic activities toward the synthesis of pyridine dicarbonitrile derivatives but the nano‐TiO2, which is prepared via a magnetized process, has shown better catalytic activity. Furthermore, this new catalytic method for the synthesis of pyridine dicarbonitriles provides rapid access to the desired compounds in high yields and so a simple work‐up procedure in the presence of water at room temperature. Therefore, this method represents a significant improvement incompatible of the other methods that are available for the synthesis of pyridine dicarbonitriles.

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In conclusion, we describe an efficient, green procedure and high yielding synthesis of thiazole derivatives using acid chlorides, potassium thiocyanate, alkyl bromides and amino acids in the presence of NR-ZnO as the catalyst in water at room temperature.

One-Pot Multicomponent Synthesis of Highly Substituted Piperidines Using p-Toluenesulfonic Acid Monohydrate as Catalyst. -(SAJADIKHAH, S. S.; MAGHSOODLOU*, M. T.; HAZERI, N.; HABIBI-KHORASSANI, S. M.; SHAMS-NAJAFI, S. J.; Monatsh. Chem. 143 (2012) 6, 939-945, http://dx.doi.org/10.1007/s00706-011-0671-7 ; Dep. Chem., Fac. Sci., Sistan & Baluchestan Univ., Zahedan, Iran; Eng.) -M. Bohle 40-165