The synthesis of polyhydroquinoline derivatives via a four-component unsymmetric Hantzsch reaction induced by solar thermal energy is reported. The process proved to be simple, environmentally friendly, economic and high yielding.

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Simple, Three-Component, Highly Efficient Green Synthesis of Thiazolo[3,2-a]pyridine Derivatives under Neat Conditions. -Changing the molar ratios, compounds (IV) or (V) become the main product. The reaction is very fast and neither prolonged conventional heating nor microwave irradiation are necessary. However, the presence of a basic catalyst is essential according to the proposed reaction mechanism. -(MEKHEIMER, R. A.; HILMY, N. M.; ABDEL HAMEED, A.; DACRORY, S.; SADEK*, K. U.; Synth. Commun. 41 (2011) 17, 2511-2516, http://dx.

An efficient one-pot synthesis of N 2-(tetrazol-5-yl)-6-aryl/heteroaryl-1,3,5-triazine-2,4-diamine derivatives was developed by reacting 5-amino-1,2,3,4-tetrazole with aromatic aldehydes and cyanamide in pyridine under controlled microwave heating with high yields. X-ray crystallography confirmed the structure of obtained products.