作者:Annette D. Allen、John Andraos、Thomas T. Tidwell、Sinisa Vukovic
DOI:10.1021/jo402438w
日期:2014.1.17
zwitterions, and these undergo amine catalyzed dealkylation forming N,N-disubstituted amides. Reactions of N-methyldialkylamines show a strong preference for methyl group loss by displacement, as predicted by computational studies. Loss of ethyl groups in reactions with triethylamine also occur by displacement, but preferential loss of isopropyl groups in the phenylketene reaction with diisopropylethylamine
叔胺在乙腈中与芳基烯酮快速可逆地反应,形成可观察到的两性离子,并且这些胺经历胺催化的脱烷基化反应,形成N,N-二取代的酰胺。N-甲基二烷基胺的反应显示出对取代引起的甲基损失的强烈偏好,如计算研究所预测的那样。与三乙胺反应中乙基的损失也可通过置换而发生,但苯乙烯酮与二异丙基乙胺反应中异丙基的优先损失显然涉及消除。奎尼丁与芳基乙烯酮迅速形成长寿命的两性离子,为金鸡纳和相关生物碱在乙烯酮的立体选择性加成中提供了催化模型。