Facile stereoselective synthesis of (E)- and (Z)-α-substituted cinnamates: stereospecific dehydration reaction with 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDC) and copper(II) chloride
作者:Hiroshi Sai、Tsuyoshi Ogiku、Hiroshi Ohmizu
DOI:10.1016/j.tet.2007.07.069
日期:2007.10
(E)- and (Z)-α-substituted cinnamates in good yield has been achieved by dehydration reaction of anti- and syn-α-substituted-β-hydroxyphenylpropiolate using EDC. This facile method has been used to synthesize various (E)- and (Z)-α-substituted cinnamates and (E)- and (Z)-α-alkylidene-γ-butyrolactones. The reaction mechanism of this highly stereospecific dehydration using EDC can be elucidated by the
对的(合成甲高度立体选择性方法ë) -和(Ž)-α-取代的以良好的收率肉桂酸酯已经通过脱水反应实现的抗-和SYN使用EDC-α取代-β-hydroxyphenylpropiolate。该简便的方法已经用于合成各种(E)-和(Z)-α-取代的肉桂酸酯以及(E)-和(Z)-α-亚烷基-γ-丁内酯。可以通过EDC的ω-二甲基氨基基团阐明使用EDC的这种高度立体定向脱水的反应机理,据信这有助于去质子化步骤。