Enamine chemistry. Part IX. Synthesis, structure, and spectra of acyclic dienamines; linear versus cross-conjugation
作者:P. W. Hickmott、B. J. Hopkins、C. T. Yoxall
DOI:10.1039/j29710000205
日期:——
formation of an equilibrium mixture of linear and cross-conjugated dienamines, the latter being the more stable thermodynamically. The stereochemistry and spectra of the dienamines and of the corresponding unsaturated ketones formed on hydrolysis are reported, and the course of the conversion of methyl alkyl ketones, and of their monoenamines, into dienamines is discussed.
已经证明无环αβ-不饱和酮与仲胺的反应方式取决于酮中存在的取代基。对于含有一个C(β)取代基的αβ-不饱和酮,会在碳-碳双键中出现胺加成反应,或形成线性二烯胺。当存在另外的C(α)-取代基时,仅形成交叉共轭的二烯胺。两种C(β)取代基的存在导致线性和交叉共轭二烯胺的平衡混合物的形成,后者在热力学上更稳定。报道了二烯胺和在水解时形成的相应的不饱和酮的立体化学和光谱,并讨论了甲基烷基酮及其单烯胺向二烯胺的转化过程。