The α-arylation of sterically hindered silyl ketene acetals (SKAs) with sterically hindered aryl bromides occurs efficiently using Pd[P(t-Bu)3]2 as the optimal catalyst and ZnF2 as a promoter. Less sensitive P(t-Bu)3-based catalysts could be also employed but showed a lower activity. The reaction showed a broad scope with regard to both coupling partners, including heteroaryl bromides and cyclic SKAs
使用Pd [P(t- Bu)3 ] 2作为最佳催化剂,并使用ZnF 2作为
促进剂,可以有效地发生空间位阻的甲
硅烷基烯酮
缩醛(SKA)与空间位阻的芳基
溴的α-芳基化反应。敏感性较低的P(t- Bu)3基催化剂也可以使用,但显示出较低的活性。对于两种偶合伙伴,包括杂芳基
溴化物和环状SKA,反应均显示出广泛的范围。它也被证明可以扩展到几克数量级,这使我们能够进一步转化酯基并获得构象受限的苄基和苯
乙胺,这是合成新农药的备受追捧的构建基块。