Stereoselective synthesis of hydroxy stilbenoids and styrenes by atom-efficient olefination with thiophthalides
作者:Prithiba Mitra、Brateen Shome、Saroj Ranjan De、Anindya Sarkar、Dipakranjan Mal
DOI:10.1039/c2ob06991a
日期:——
The synthesis of stilbenoids and styryl carboxylic acids is accomplished with high E-stereoselectivity by olefination of aldehydes with thiophthalides under basic conditions. The olefination is highly atom-efficient as it only loses elemental sulfur during the reaction. This olefination, in conjunction with retro Kolbe–Schmitt reaction, allows facile synthesis of E-hydroxystilbenoids with minimal employment of protecting groups. This study also discloses two important findings: formation of i) 4-methylsulfanyl isocoumarins and ii) an 2-arylindenone.
在碱性条件下,通过硫代邻苯二甲酸酯对醛进行烯化反应,可以高E-立体选择性地合成芪类化合物和苯乙烯基羧酸。该烯化反应具有高度的原子效率,因为在反应过程中仅损失了元素硫。这种烯化反应与逆科尔比-施密特反应相结合,能够简便地合成E-羟基芪类化合物,并最小程度地使用保护基团。这项研究还揭示了两个重要发现:i) 形成4-甲硫基异香豆素和ii) 形成2-芳基茚满酮。