Triaryl-Substituted Divinyl Ketones Cyclization: Nazarov Reaction versus Friedel–Crafts Electrophilic Substitution
作者:Valerii Z. Shirinian、Andrey G. Lvov、Anton V. Yadykov、Liana V. Yaminova、Vadim V. Kachala、Ashot I. Markosyan
DOI:10.1021/acs.orglett.6b03023
日期:2016.12.16
triaryl-substituted divinyl ketones has been studied. It was found that the reaction pathway strongly depends on the nature of the aryl substituent at the α-position to the carbonyl group. An electron-rich aromatic substituent promotes the reaction to proceed through the intramolecular Friedel–Crafts electrophilic substitution giving dihydronaphthalene derivatives. In contrast, the presence of an electron-deficient
已经研究了广泛的三芳基取代的二乙烯基酮的酸催化环化。发现反应路径强烈取决于羰基的α位上的芳基取代基的性质。富电子的芳族取代基通过分子内的Friedel-Crafts亲电取代促进反应进行,从而生成二氢萘衍生物。相反,缺电子取代基的存在有利于Nazarov4π-旋转环化,产生三芳基取代的环戊烯酮。亲电取代反应应用于噻吩和噻唑衍生物。