The synthesis, characterization and optical properties of novel 2-acyl 6-arylindolizines.

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作者单位: School of Chemistry and Chemical Engineering, Shandong University, Jinan, Shandong 250100, PR China School of Chemical Engineering, Taishan Medical University, Taian, Shandong 271016, PR China

关键词: Fluorescence Indolizine Nitrogen-bridgehead Synthesis Tandem UV absorption

摘要: A series of novel 2-acyl-6-aryl substituted indolizine derivatives was synthesized by a novel tandem reaction between 4-acyl-pyrrole-2-carbaldehyde derivatives and ethyl 4-bromo-3-arylbut-2-enoate under mild conditions. The compounds were characterized using IR, 1 H NMR 13 C NMR and HRMS. The crystal structure of 7a was determined using single crystal X-ray crystallography. The absorption results showed that compounds 7a–e presented their absorption maxima at ca. 270 nm, while compounds 7f and 7...更多; A series of novel 2-acyl-6-aryl substituted indolizine derivatives was synthesized by a novel tandem reaction between 4-acyl-pyrrole-2-carbaldehyde derivatives and ethyl 4-bromo-3-arylbut-2-enoate under mild conditions. The compounds were characterized using IR, 1 H NMR 13 C NMR and HRMS. The crystal structure of 7a was determined using single crystal X-ray crystallography. The absorption results showed that compounds 7a–e presented their absorption maxima at ca. 270 nm, while compounds 7f and 7g with a larger conjugation system exhibited red-shifted absorption character . Fluorescence spectra revealed that these compounds exhibited blue fluorescence in dilute solutions and showed quantum yields of fluorescence between 0.02 and 0.39 in dichloromethane.收起

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