(N-Heterocyclic Carbene)2-Pd(0)-Catalyzed Silaboration of Internal and Terminal Alkynes: Scope and Mechanistic Studies

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• 作者：Melvyn B. Ansell ; John Spencer ; Oscar Navarro
• 刊名：ACS Catalysis
• 出版年：2016
• 出版时间：April 1, 2016
• 年：2016
• 卷：6
• 期：4
• 页码：2192-2196
• 全文大小：364K
• ISSN：2155-5435

文摘

Pd(ITMe)b>2b>(PhC≡CPh) acts as a highly reactive precatalyst in the silaboration of terminal and internal alkynes to yield a number of known and novel 1-silyl-2-boryl alkenes. Unprecedented mild reaction temperatures for terminal alkynes, short reaction times, and low catalytic loadings are reported. During mechanistic studies, cis-Pd(ITMe)b>2b>(SiMeb>2b>Ph)(Bpin) was directly synthesized by oxidative addition of PhMeb>2b>SiBpin to Pd(ITMe)b>2b>(PhC≡CPh). This represents a very rare example of a (silyl)(boryl)palladium complex. A plausible catalyst decomposition route was also examined.