Transition-Metal-Free Method for the Synthesis of Benzo[b]thiophenes from o-Halovinylbenzenes and K2S via Direct SNAr-Type Reaction, Cyclization, and Dehydrogenation Process
摘要:
A new, highly efficient procedure for the synthesis of benzothiophenes from easily available o-halovinylbenzenes and potassium sulfide has been developed. The reaction tolerated a wide range of functionalities, and various 2-substituted benzo[b]thiophenes are provided in the high yields in the absence of a transition-metal catalyst.
A General Method for Suzuki–Miyaura Coupling Reactions Using Lithium Triisopropyl Borates
作者:Matthias A. Oberli、Stephen L. Buchwald
DOI:10.1021/ol302063g
日期:2012.9.7
Conditions for the Suzuki–Miyauracoupling of lithium triisopropyl borates are reported, as well as a procedure for a one-pot lithiation, borylation, and subsequent Suzuki–Miyauracoupling of various heterocycles with aryl halides. These borate species are much more stable toward protodeboronation than the corresponding boronic acids and can conveniently be stored on benchtop at room temperature.
Various practical methods for the selective C−Hfunctionalization of the ortho and recently also of the meta position of an arene have already been developed. Following our recent development of the directing‐group‐assisted para C−Hfunctionalization of toluene derivatives, we herein report the first remote para C−Hfunctionalization of phenol derivatives by using a recyclable silicon‐containing biphenyl‐based
Transition-Metal-Free Method for the Synthesis of Benzo[b]thiophenes from o-Halovinylbenzenes and K2S via Direct SNAr-Type Reaction, Cyclization, and Dehydrogenation Process
A new, highly efficient procedure for the synthesis of benzothiophenes from easily available o-halovinylbenzenes and potassium sulfide has been developed. The reaction tolerated a wide range of functionalities, and various 2-substituted benzo[b]thiophenes are provided in the high yields in the absence of a transition-metal catalyst.