Introduction of Electrophiles to the α-Position of α,β-Unsaturated Aldehydes and Ketones by Sequential Conjugate Aminosilylation-Alkylation-Deamination
作者:Makoto Hojo、Masayuki Nagayoshi、Atsuko Fujii、Toshiharu Yanagi、Naruyasu Ishibashi、Katsukiyo Miura、Akira Hosomi
DOI:10.1246/cl.1994.719
日期:1994.4
Silylamines add to α,β-unsaturated aldehydes and ketones in 1,4-addition mode to generate amino-substituted silyl enol ethers without any catalysts. These easily isolable silyl enol ethers react with acetals and aldehydes in the presence of a Lewis acid to give α-alkoxyalkyl and α-hydroxyalkyl substituted α,β-unsaturated carbonyl compounds, respectively, after deamination by treatment with silica gel
甲硅烷基胺以 1,4-加成模式与 α,β-不饱和醛和酮加成,生成氨基取代的甲硅烷基烯醇醚,无需任何催化剂。这些易于分离的甲硅烷基烯醇醚在路易斯酸存在下与缩醛和醛反应,在通过硅胶处理脱氨基后分别生成 α-烷氧基烷基和 α-羟烷基取代的 α,β-不饱和羰基化合物。