Currently, catalytically transferable carbenes are limited to electron-deficient and neutral derivatives, and electron-rich carbenes bearing an alkoxy group (i.e., Fischer-type carbenes) cannot be used in catalyticcyclopropanation because of the lack of appropriate carbene precursors. We report herein that acylsilanes can serve as a source of electron-rich carbenes under palladium catalysis, enabling
gold(I)‐catalyzed synthesis of indanones from trimethylsilylacetylenes and acylsilanes is presented. The reaction is initiated through a synergistic acylsilane activation–gold acetylide formation and involves consecutive alkyne σ‐gold(I) addition, π‐activation, and 1,2‐migration of a silyl group. Studies performed on the reaction mechanism allowed to establish the nature of the silyl migrating group and invoke the
Palladium-catalyzed carbonylative coupling reactions of aryl iodides with hexamethyldisilane (HMDS) to benzoyl silanes
作者:Xiao-Feng Wu、Helfried Neumann、Matthias Beller
DOI:10.1016/j.tetlet.2011.11.104
日期:2012.2
A novel procedure for the palladium-catalyzedcarbonylative synthesis of acyl silanes has been developed. Starting from aryliodides and hexamethyldisilane (HMDS) various benzoyl silanes are produced in moderate to good yields.
Stereoselective Synthesis of Silylated Vinylboronates by a Boron‐Wittig Reaction and Their Application to Tetrasubstituted Olefins
作者:Subrata Hazra、Santanu Panda
DOI:10.1002/chem.202303056
日期:2024.2.12
series of tetrasubstituted silylated pinacol vinylboronates and trisubstituted silylated vinyl MIDA-boronates was synthesized by using the boron-Wittig approach. By using this protocol, the boryl and the silyl groups can be directly and highly stereoselectively incorporated into the olefin‘s anti-position. Further, sequential Suzuki coupling of the silylated vinyl boronates allows access to several
Visible-Light-Induced Catalyst-Free Carboxylation of Acylsilanes with Carbon Dioxide
作者:Zhengning Fan、Yaping Yi、Shenhao Chen、Chanjuan Xi
DOI:10.1021/acs.orglett.1c00435
日期:2021.3.19
Intermolecular carbon–carbon bond formation between acylsilanes and carbondioxide (CO2) was achieved by photoirradiation under catalyst-free conditions. In this reaction, siloxycarbenes generated by photoisomerization of the acylsilanes added to the C═O bond of CO2 to give α-ketocarboxylates, which underwent hydrolysis to afford α-ketocarboxylic derivatives in good yields. Control experiments suggest