Transition-Metal-Free Cascade Synthesis of 4-Quinolones: Umpolung of Michael Acceptors via Ene Reaction with Arynes
作者:R. Santhosh Reddy、Chandraiah Lagishetti、I. N. Chaithanya Kiran、Hengyao You、Yun He
DOI:10.1021/acs.orglett.6b01830
日期:2016.8.5
adducts through a cascade sequence involving an insertion/cyclization/ene reaction process to afford 4-quinolones in high yields with a broad substrate scope under mild reaction conditions. Essentially, an umpolung of reactivity at the β carbon of α,β-unsaturated ketone has been achieved by an inverse electron demand aryne–ene reaction to provide a C-arylated product.
描述了一种新颖的“一锅”芳烃转化,该转化可提供各种4-喹诺酮衍生物,而无需借助过渡金属催化。Arynes与aza-Morita–Baylis–Hillman(AMBH)加合物通过级联序列反应,涉及插入/环化/烯反应过程,从而在温和的反应条件下以高收率提供高产的4-喹诺酮类化合物。本质上,在α,β不饱和酮的β碳反应性的极性转换已经由逆电子需求芳炔-烯反应来实现,以提供Ç -arylated产物。