The organometallic intermediate (3) can be used to prepare iodo-allenes, and allenic and β-acetylenic ketones as well as ethers; the site of the reaction of an electrophile on the organometallic intermediate seems to depend on the hard or soft nature of the reagent according to Pearson's theory.
One-Step Ethynylation of Silyl Enol Ether with Chlorosilylethyne
作者:Mieko Arisawa、Ryo Amemiya、Masahiko Yamaguchi
DOI:10.1021/ol026050l
日期:2002.6.1
[reaction: see text] In the presence of GaCl(3), silyl enol ethers are ethynylated at the alpha-carbon atom with chlorotrimethylsilylethyne. This reaction can provide alpha-ethynylated aryl ketones possessing acidic alpha-protons without isomerization to conjugated allenyl ketones.