Kumada Coupling of Aryl and Vinyl Tosylates under Mild Conditions
摘要:
Aryl and alkenyl tosylates are easily prepared, inexpensive and, thus, attractive for transition-metal-catalyzed couplings, but their reactivity is low. We report examples of mild, palladium-catalyzed coupling of aryl, alkenyl, and alkyl Grignard reagents with aryl and alkenyl tosylates. The resulting biaryls, vinylarenes, and alkylarenes were isolated in good to excellent yield. These couplings were conducted with a nearly equimolar ratio of the two reactants, and many examples were conducted at room temperature.
Main Group-Catalyzed Cationic Claisen Rearrangements via Vinyl Carbocations
作者:Chloe G. Williams、Sepand K. Nistanaki、Krista Dong、Woojin Lee、Kendall N. Houk、Hosea M. Nelson
DOI:10.1021/acs.orglett.4c00837
日期:2024.6.14
interception of vinyl carbocations with allylethers. The reaction utilizes commercially available borate salts as catalysts and is effective at constructing sterically hindered C–C bonds. The reaction mechanism is studied experimentally and computationally to support a charge-accelerated [3,3] rearrangement of a silyloxonium cation. Our reaction is also applied to the highlystereoselectivesynthesis of fully