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1,3,5-取代吡唑-4-亚甲基环丙烷羧酸酯的合成及生物活性黄润秋,宋健,冯磊(南开大学元素有机化学研究所,元素有机化学国家重点实验室,天津,300071)关键词吡唑,环丙烷羧酸酯,杀虫剂,杀病毒剂吡唑类杂环化合物有广泛的生物活性,并有若干高效的杀虫... 相似文献
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Weibo Yang Shengqing Ye Dewey Fanning Timothy Coon Yvonne Schmidt Paul Krenitsky Dean Stamos Jin‐Quan Yu 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2015,127(8):2531-2534
A sequential triple C H activation reaction directed by a pyrazole and an amide group leads to the well‐controlled construction of sterically congested dihydrobenzo[e]indazole derivatives. This cascade reaction demonstrates that the often problematic competing C H activation pathways in the presence of multiple directing groups can be harvested by design to improve step economy in synthesis. Pyrazole as a relatively weak coordinating group is shown to direct C H activation for the first time. 相似文献
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《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2017,129(51):16480-16484
Regioselective C4‐, C5‐, and di‐alkenylations of pyrazoles were achieved. An electrophilic Pd catalyst generated by trifluoroacetic acid (TFA) and 4,5‐diazafluoren‐9‐one (DAF) leads to C4‐alkenylation, whereas KOAc and mono‐protected amino acid (MPAA) ligand Ac‐Val‐OH give C5‐alkenylation. A combination of palladium acetate, silver carbonate, and pivalic acid affords dialkenylation products. Annulation through sequential alkenylation, thermal 6π‐electrocyclization, and oxidation gives functionalized indazoles. This comprehensive strategy greatly expands the range of readily accessible pyrazole and indazole derivatives, enabling useful regiodivergent C−H functionalization of pyrazoles and other heteroaromatic systems. 相似文献
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A novel diarylethene containing a 3-(4-methylphenyl)-1H-pyrazol-5-amine was synthesized. Its multi-responsive properties induced by UV/Vis lights and metal ions were studied in detail by absorption and fluorescence emission spectroscopy. It showed excellent fluorescence sensing ability for Al3+ and Zn2+ with very low detection limit. In addition, based on the multi-responsive characteristics, a logic circuit was constructed by using both UV/Vis lights and chemical species stimuli as inputs and fluorescence intensity as outputs. Moreover, the diarylethene was successfully applied to effectively detect Al3+ and Zn2+ in actual water samples. 相似文献
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