Pd-Catalyzed Selective Carbonylative and Non-carbonylative Couplings of Propiolic Acid: One-Pot Synthesis of Diarylalkynones
作者:Wonyoung Kim、Kyungho Park、Ahbyeol Park、Juseok Choe、Sunwoo Lee
DOI:10.1021/ol4004349
日期:2013.4.5
Diarylalkynones were synthesized from one-potPd-catalyzedcarbonylative and noncarbonylative coupling reactions of propiolicacid with aryl iodides under a carbon monoxide atmosphere. Aryl iodide (2.0 equiv), propiolicacid (1.0 equiv), Pd(PPh3)2Cl2 (5 mol %), CuCl (10 mol %), Et3N (6.0 equiv), and CO (8 atm) were reacted under optimized conditions in CH3CN at 80 °C for 1 h. This process afforded
Iron(III) Chloride/Diorganyl Diselenides-Promoted Regioselective Cyclization of Alkynyl Aryl Ketones: Synthesis of 3-Organoselenyl Chromenones under Ambient Atmosphere
作者:Benhur Godoi、Adriane Sperança、Cesar A. Bruning、Davi F. Back、Paulo Henrique Menezes、Cristina W. Nogueira、Gilson Zeni
DOI:10.1002/adsc.201100189
日期:2011.8
benign synthesis of 3-organoselenylchromenones was accomplished via iron(III) chloride/diorganyldiselenides-promoted intramolecular 6-endo-dig cyclization of alkynylarylketone derivatives. The cyclization reactions proceeded cleanly under mild reaction conditions, and the desired chromenone derivatives were smoothly isolated in good yields. The methodology proved to be highly regioselective, giving
Base-Catalyzed Synthesis of Flavones via Thiol-Assisted Sequential Demethylation/Cyclization of 1-(2-Methoxyphenyl)prop-2-yn-1-ones
作者:Benhur Godoi、Ritiele Heck、Thiago Anjos、Maira R. Giehl、Ricardo F. Schumacher
DOI:10.1055/a-1874-5283
日期:2022.10
metabolites. Herein, an efficient and regioselective synthetic strategy for the preparation of functionalized flavones is demonstrated through sequential demethylation/6-endo-dig intramolecular cyclization of propyn-1-ones, using catalytic amounts of base in the presence of a thiol, by employing NMP as the solvent. The reactions proceeded smoothly under transition-metal-free and open to air conditions