Recent progress in the field of transition‐metal‐catalyzed cross‐coupling reactions on various azole systems is summarized. Most important C–C‐ and C–X‐bond formation methodologies (Negishi, Suzuki–Miyaura, Stille, Kumada–Corriu–Tamao, Hiyama, Sonogashira, Heck, C–H activation) are reviewed and discussed for the imidazole, oxazole, thiazole, pyrazole, isoxazole, and isothiazole system, as well as for azoles with more than two heteroatoms. This review covers the literature that appeared in the past ten years up to the end of 2005 with corresponding azoles used either as metal organyl or halide (including triflates and some other less frequently applied leaving groups); literature describing azole structures only as ligands was not included.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)

Novel coumarin derivatives, 2-oxo-2H-chromenecarbaldehyde hydrazones were prepared by reaction of substituted 2-oxo-2H-chromenecarbaldehydes with N-aminoimides in ethanol in the presence of 4-toluenesulfonic acid as catalyst. The photochromic and thermochromic properties of the prepared compounds were investigated.

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Organic chemistry Z 0200Cross-Coupling Reactions on Azoles with Two and More Heteroatoms -[178 refs.]. -(SCHNUERCH, M.; FLASIK, R.; KHAN, A. F.; SPINA, M.; MIHOVILOVIC, M. D.; STANETTY*, P.; Eur.

Efficient Synthesis of 3-Methyl-2H-chromen-2-one: Classic versus Microwave Conditions. -Different methods for the multigram synthesis of title compound (III) are compared. Best results are achieved using a microwave-assisted Perkin reaction. -(FLOREKOVA, L.; FLASIK, R.; STANKOVICOVA*, H.; GAPLOVSKY, A.; Synth. Commun. 41 (2011) 10, 1514-1519, http://dx.doi.org/10.1080/00397911.2010.487174 ; Inst. Chem., Fac. Nat. Sci., Comenius Univ., SK-842 15 Bratislava, Slovakia; Eng.) -H. Haber 44-135