- Catalytic [3+3] Annulation of β-Ketoethers and Cyclopropenones via C(sp3)—O/C—C Bond Cleavage under Transition-Metal Free Conditions
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The efficient cleavage of carbon-oxygen (C—O) bond is highly important for the transformation of oxygen-rich biomass and industry chemicals. Herein, an efficient [3+3] annulation of β-ketoethers with cyclopropenones in the presence of catalytic base has b
- Bai, Dachang,Chen, Junyan,Zheng, Bingbing,Li, Xueyan,Chang, Junbiao
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supporting information
p. 2769 - 2773
(2021/08/09)
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- Synthesis method of 2-pyrone compound and alpha, beta-unsaturated chain ester compound
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The invention provides a synthesis method of a 2-pyrone compound 3 and an alpha, beta-unsaturated chain ester compound 4, and belongs to the technical field of organic synthesis. According to the synthesis method, lignin and cyclopropenone are catalyzed by potassium tert-butoxide to be subjected to [3 + 3] cycloaddition reaction to prepare the 2-pyrone compound. In an organic solvent, potassium tert-butoxide is used as a catalyst, and the lignin compound 1 and the cyclopropenone compound 2 react under a heating condition to obtain a 2-pyrone compound 3; when R is aryl, alpha, beta unsaturated chain ester compounds 4 are also generated; according to the method, the beta-O-4 bond in the lignin model is selectively broken to synthesize the 2-pyrone compound; the used raw materials are simple and easy to obtain, the adopted catalyst is low in price, wide in source, easy to obtain and small in dosage, the reaction conditions are relatively mild, and the product can be obtained at a relatively high yield.
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Paragraph 0048-0050
(2021/08/07)
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- Rh(III)-Catalyzed [3 + 3] Annulation Reaction of Cyclopropenones and Sulfoxonium Ylides toward Trisubstituted 2-Pyrones
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A new Rh(III)-catalyzed [3 + 3] annulation reaction between cyclopropenones and β-ketosulfoxonium ylides has been reported, enabling metal carbene insertion to access a wide range of trisubstituted 2-pyrones with moderate to excellent yields via C-C single-bond cleavage, in which sulfoxonium ylides serve as potential safe precursors of metal carbenes. This reaction occurred under redox-neutral conditions with a broad substrate scope.
- Zhou, Peng,Yang, Wei-Tao,Rahman, Anis Ur,Li, Guigen,Jiang, Bo
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p. 360 - 366
(2019/11/14)
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- Synthesis and biological evaluation of 3,4,6-triaryl-2-pyranones as a potential new class of anti-breast cancer agents
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A series of 3,4,6-triaryl-2-pyranones, new class of anti-breast cancer agents, have been synthesized as a structural variants of cyclic triphenylethylenes by replacing the fused benzene ring with pendant phenyl ring to mimic the phenolic A ring of estradi
- Shankar, Ravi,Chakravarti, Bandana,Singh, Uma Sharan,Ansari, Mohd. Imran,Deshpande, Shreekant,Dwivedi, Shailendra Kumar Dhar,Bid, Hemant Kumar,Konwar, Rituraj,Kharkwal, Geetika,Chandra, Vishal,Dwivedi, Anila,Hajela
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experimental part
p. 3847 - 3856
(2009/10/17)
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- Novel fluorescent aluminum complexes based on N-hydroxy-3,6-diaryl-4- phenyl-2-pyridone ligands
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Novel fluorescent aluminium complexes of N-hydroxy-3,6-diaryl-4-phenyl-2- pyridone derivatives were synthesized and their fluorescent properties were investigated. The complexes having a trifluoromethyl group and a methoxy group at the para-position on th
- Minakata, Satoshi,Inada, Hiroshi,Komatsu, Mitsuo,Kajii, Hirotake,Ohmori, Yutaka,Tsumura, Manabu,Namura, Kiyoyuki
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p. 248 - 249
(2008/09/20)
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- Synthesis and spectroscopic properties of new fluorescent 3,6-Diaryl-4-phenyl-2-pyridone derivatives
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Novel fluorescent 3,6-diaryl-4-phenyl-2-pyridone derivatives were synthesized and their fluorescent properties were investigated. These compounds emit intense brilliant blue fluorescence only in the solid state, not in solution. An electron-donating subst
- Minakata, Satoshi,Moriwaki, Shouta,Inada, Hiroshi,Komatsu, Mitsuo,Kajii, Hirotake,Ohmori, Yutaka,Tsumura, Manabu,Namura, Kiyoyuki
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p. 1014 - 1015
(2008/02/10)
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- Unusual fluorescent properties of novel fluorophores, 6-aryl-3,4-diphenyl-α-pyrone derivatives
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Novel fluorophores, 6-aryl-3,4-diphenyl-α-pyrones, were synthesized and their spectroscopic properties investigated in the form of evaporated films on plain glass slides, as well as in the solid and solution states. An electron-donating aryl group on the 6-position of the pyrones causes a red-shift in the absorption and fluorescent maxima. In the solid states, they show intense blue-to-orange fluorescence, but not in solution. This unusual fluorescent property is caused by fixing the 6-aryl group of the pyrones, and is the result of molecular packing. These interactions induce a pathway for radiative decay, which is associated with intense fluorescence emission only in the solid state.
- Hirano,Minakata,Komatsu
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p. 1567 - 1575
(2007/10/03)
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- Unusual fluorescent properties of 3,4,6-triphenyl-α-pyrones
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Novel fluorophores, 3,4,6-triphenyl-α-pyrone derivatives, were synthesized and their spectroscopic properties have been investigated. In the solid state they show intense greenish-yellow fluorescence, but not in solution. It is concluded that the 6-phenyl
- Hirano, Keisuke,Minakata, Satoshi,Komatsu, Mitsuo
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