33524-68-4Relevant academic research and scientific papers
Synthesis method of 2-pyrone compound and alpha, beta-unsaturated chain ester compound
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Paragraph 0039-0041, (2021/08/07)
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.
Catalytic [3+3] Annulation of β-Ketoethers and Cyclopropenones via C(sp3)—O/C—C Bond Cleavage under Transition-Metal Free Conditions
Bai, Dachang,Chen, Junyan,Zheng, Bingbing,Li, Xueyan,Chang, Junbiao
supporting information, p. 2769 - 2773 (2021/08/09)
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
