Preparation of Ethyl 2-Aryl 2,3-Alkadienoates via Palladium-Catalyzed Selective Cross-Coupling Reactions
摘要:
Pd-catalyzed cross-coupling reactions of aryl iodides containing not only an electron-donating group but also an electron-withdrawing group on the aryl ring with organoindium reagents generated in situ from indium and ethyl 4-bromo-2-alkynoates produced selectively ethyl 2-aryl-2,3-alkadienoates in good yield.
Synthesis of 4-allenyl and 4-proparyl-2-azetidinone via Zn-mediated Barbier-type reaction and Pt-catalyzed intramolecular amidation to carbapenem skeletons
作者:Biao Jiang、Hua Tian
DOI:10.1016/j.tetlet.2007.09.061
日期:2007.11
4-Propargyl-2-azetidinone and 4-allenyl-2-azetidinone derivatives can be facilely obtained from 4-acetoxy-2-azetidinone and propargyl bromides via zinc-mediated Barbier-type reaction. A new method has been developed to construct the carbapenem bicyclic nucleus by cyclization of 4-propargyl-2-azetidinone and 4-allenyl-2-azetidinone derivatives catalyzed by PtCl2. (c) 2007 Elsevier Ltd. All rights reserved.