Regioselective Three-Component Synthesis of Highly Fluorescent 1,3,5-Trisubstituted Pyrazoles
作者:Benjamin Willy、Thomas J. J. Müller
DOI:10.1002/ejoc.200800444
日期:2008.8
3,5-Disubstituted and 1,3,5-trisubstituted pyrazoles are readily synthesized from acyl chlorides, terminal alkynes, and hydrazines by a consecutive one-pot three-component Sonogashira coupling/Michael addition/cyclocondensation sequence in good to excellent yields. These pyrazoles are highly fluorescent, both in solution and in the solid state. Investigation of the electronic properties by UV/Vis and
3,5-二取代和 1,3,5-三取代的吡唑很容易从酰氯、末端炔烃和肼通过连续的一锅三组分 Sonogashira 偶联/迈克尔加成/环缩合序列合成,产率很好。这些吡唑在溶液和固态中都具有很强的荧光性。通过 UV/Vis 和荧光光谱以及 DFT 和 ZINDO CI 计算对电子特性的研究表明,激发态是高度极性的,可以对吸收和发射特性进行微调。3,5-二取代吡唑的 X 射线结构分析揭示了通过氢键和 π 堆积的自组织。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)