New synthetic routes to furans and dihydrofurans from 1-propargylbenzotriazole
摘要:
Base-assisted cyclizations of 1-[3-[hydroxy(substituted methyl)]propargyl]benzotriazoles, derived from lithiated 1-propargylbenzotriazole (1) and aromatic aldehydes or ketones, gave 2-arylfurans 5 or 1-(5,5-diaryl-2,5-dihydrofuran-2-yl)benzotriazoles 7, respectively, in high yields. Compounds 7 with Grignard reagents yielded trisubstituted 2,5-dihydrofurans 9.
Regio- and Stereoselective Copper-Catalyzed Allylation of 1,3-Dicarbonyl Compounds with Terminal Allenes
作者:Rémi Blieck、Racha Abed Ali Abdine、Marc Taillefer、Florian Monnier
DOI:10.1021/acs.orglett.8b00575
日期:2018.4.20
stereoselective reaction has been accomplished in the presence of malonates, 1,3-ketoesters, and 1,3-diketones with good to excellent yields under mild conditions. This methodology represents the first allylation of 1,3-dicarbonyl compounds with allenes catalyzed by copper.
Copper-Catalyzed Hydrocarboxylation of <i>N</i>-Allenyl Derivatives
作者:Rémi Blieck、Marc Taillefer、Florian Monnier
DOI:10.1021/acs.joc.9b01510
日期:2019.9.6
The addition of carboxylicacids to allenes was performed with copper catalysis. This hydrocarboxylation reaction, occurring on the terminal carbon of the allenes, is totally regio- and stereoselective. It represents the first copper-catalyzed example of intermolecular C–O bond formation by allene hydrofunctionalization. This ligand-free system is based on the use of catalytic amounts of copper combined
在铜催化下将羧酸加成至烯丙基。这种发生在丙二烯末端碳上的加氢羧化反应完全是区域和立体选择性的。它代表了铜通过丙二烯加氢官能化形成分子间C-O键的第一个铜催化实例。该无配体体系基于催化量的铜与碱(10 mol%的K 2 CO 3)结合使用。
Diez-Barra, Enrique; Hoz, Antonio de la; Loupy, Andre, Heterocycles, 1994, vol. 38, # 6, p. 1367 - 1374
作者:Diez-Barra, Enrique、Hoz, Antonio de la、Loupy, Andre、Sanchez-Migallon, Ana
DOI:——
日期:——
Synthesis of quinol-4-ones and chroman-4-ones via a palladium-catalysed cascade carbonylation–allene insertion
作者:Ronald Grigg、Angela Liu、Duncan Shaw、Selvaratnam Suganthan、Diane E Woodall、Gnanamoly Yoganathan
DOI:10.1016/s0040-4039(00)01176-x
日期:2000.9
Palladium(0)-catalysed termolecular queuing processes involving oxidative addition to aryl iodides followed by low pressure carbonylation, allene insertion and capture of the resulting pi-allyl palladium(II) species by an internal O- or N-nucleophile occur in good yields. One-pot 3-methylene chromanone/quinolone synthesis-Michael addition-stereoselective reduction are also reported. (C) 2000 Elsevier Science Ltd. All rights reserved.
Katritzky, Alan R.; Li, Jianqing; Malhotra, Nageshwar, Liebigs Annalen der Chemie, 1992, # 8, p. 843 - 854
作者:Katritzky, Alan R.、Li, Jianqing、Malhotra, Nageshwar