菲尔:巴尔加斯巴尔加斯,迪迪埃法利。Consejo Nacional de Investigaciones Cientificas y Tecnicas。Centro Cientifico Tecnologico Conicet - 罗萨里奥。Instituto de Quimica Rosario。罗萨里奥国立大学。Facultad de Ciencias Bioquimicas y Farmaceuticas。Instituto de Quimica Rosario;阿根廷
Construction of Sulfonyl Oxabenzo[3.3.1]bicyclic Core via Cyclocondensation of β-Ketosulfones and <i>o</i>-Formyl Allylbenzenes
作者:Nai-Chen Hsueh、Hsing-Yin Chen、Meng-Yang Chang
DOI:10.1021/acs.joc.7b02425
日期:2017.12.15
NH4OAc mediated domino Knoevenagel/DielsAlder cyclocondensation of beta-ketosulfones 1 and o-formyl allylbenzenes 2 provides sulfonyl oxabenzo[3.3.1]bicyclic core 4 in a cosolvent of toluene and HOAc (v/v = 1/1) at reflux for 3 h. The intermediate 3 contains a chalcone motif. The uses of various ammonium salts and solvent systems are investigated for facile and efficient transformation. The plausible mechanisms have been proposed and the DFT calculations have been included.
One-pot access to 2-naphthols and benzofurans via the aerobic Wacker-type oxidation/intramolecular aldol cyclization
作者:Meng-Yang Chang、Chieh-Kai Chan、Shin-Ying Lin
DOI:10.1016/j.tet.2012.12.009
日期:2013.2
An aerobic Wacker-type oxidation/intramolecular aldol cyclization synthetic route toward two oxygenated 2-naphthols 3 and benzofurans 4 starting with skeleton 2 with good yields is described. The route has been carried by the one-pot transformation of the regioselective PdCl2/CuCl2-mediated Wacker oxidative cyclization of skeleton 2 with molecular oxygen under the alkaline methanolic condition. Skeleton 2 was prepared from skeleton 1 in moderate total yields via the known protocol. (c) 2012 Elsevier Ltd. All rights reserved.