Selectivity Controlled Palladium-Catalyzed Carbonylative Synthesis of Propiolates and Chromenones from Phenols and Alkynes
作者:Fengxiang Zhu、Xiao-Feng Wu
DOI:10.1021/acs.orglett.8b01368
日期:2018.6.1
interesting selectivity-controlled palladium-catalyzed oxidative carbonylation procedure for the synthesis of propiolates and chromenones has been developed. Starting from phenols and alkynes, under slightly different conditions, various propiolates and chromenones can be isolated in moderate to good yields. Additionally, this also presents the first example of direct carbonylative annulation of nonpreactivated
Cyclization of aryl 3-aryl propynoates into 4-arylcoumarins catalyzed by cyclometalated Platinum(II) complexes
作者:Olesia Zaitceva、Valérie Bénéteau、Dmitry S. Ryabukhin、Ivan I. Eliseev、Mikhal A. Kinzhalov、Benoit Louis、Aleksander V. Vasilyev、Patrick Pale
DOI:10.1016/j.tet.2020.131029
日期:2020.4
Cyclometalated (ppy)PtII complexes (ppy = 2-phenylpyridinato-C2,N) catalyze the intramolecular cyclization of aryl propynoates to form coumarins and benzocoumarins. The complex [(ppy)PtCl(MeCN)] (5 mol %) was the most active and efficient catalyst for such reaction, especially in the presence of AgSbF6 (15 mol %) in 1,2-dichloroethane. With this catalytic system, a wide range of substituents and functional