Diazo(trimethylsilyl)methylmagnesium bromide reacted with (o-methoxyphenyl)(oxo)acetates to readily afford 2-unsubstituted benzofuran-3-carboxylates via oxonium ylides formed from the initially generated alkylidenecarbene intermediates. (C) 2009 Elsevier Ltd. All rights reserved.
Palladium-catalyzed cross-coupling of terminal alkynes with di-tert-butyl dicarbonate: Facile access to functionalized alkynoate esters
作者:Jing-Hui Liu、Yao-Wei Liu、Chuang Geng、Bin Zhao、Guo-Qin Hu
DOI:10.1016/j.tet.2023.133418
日期:2023.6
An efficientpalladium-catalyzed alkoxycarbonylation of terminalalkynes was developed using di-tert-butyl dicarbonate as the ester source. This protocol proceeded under mild conditions and exhibited a board substrate scope. The successful application of gram-scale synthesis and product derivatization further confirmed the synthetic utility of this method. Thus it provides a powerful route to the synthesis