Tandem (2 + 2) Annulation/Retro-4π Electrocyclization/Imino-Nazarov Cyclization Reaction of <i>p</i>-Quinone Methides with Ynamides: Expeditious Construction of Functionalized Aminoindenes
作者:Ke-Yin Yu、Yu-Hua Deng、Xiao-Min Ge、Xian-Tao An、Peng-Fei Shu、Ye-Xing Cao、Xian-He Zhao、Chun-An Fan
DOI:10.1021/acs.orglett.1c02003
日期:2021.8.6
p-quinone methides (p-QMs) with ynamides is described. This cascade reaction features a unique combination of (2 + 2) annulation, retro-4π electrocyclization, and imino-Nazarov cyclization, wherein vinyl p-quinone methides (p-VQMs) as one of the key intermediates have been identified chemically. Significantly, an unusual structural reconstruction of p-QMs involving the cleavage of the C5–C6 bond and
描述了一种新的对-醌甲基化物 ( p- QMs) 与 ynamides 的串联环化。这种级联反应具有 (2 + 2) 环化、逆 4π 电环化和亚氨基-纳扎罗夫环化的独特组合,其中乙烯基对醌甲基化物 ( p- VQMs) 作为关键中间体之一已被化学鉴定。值得注意的是,涉及 C5-C6 键断裂和 C4-C6 键后期形成的p- QM的不寻常结构重建,导致构建功能化氨基茚的方法学发展。