A Nazarov‐Ene Tandem Reaction for the Stereoselective Construction of Spiro Compounds
作者:Christoph Etling、Giada Tedesco、Markus Kalesse
DOI:10.1002/chem.202101041
日期:2021.6.25
cyclization tandem reaction is presented, terminating the oxyallyl cation by an ene-type reaction, and leading stereoselectively to bicyclic spiro compounds. The terminal olefin of this motif represents a useful handle for further functionalization, making it a strategic intermediate in total syntheses. The tandem Nazarov/ene cyclization was shown to be preferred over a Nazarov/[3+2] tandem reaction for all our
研究了在路易斯酸和布朗斯台德酸催化下三烯酮的不同反应性,产生了不同的环化产物和碳骨架,它们源自共轭 Prins 环化或中断的 Nazarov 环化。特别是,提出了前所未有的 Nazarov 环化串联反应,通过烯型反应终止氧烯丙基阳离子,并立体选择性地导致双环螺环化合物。该基序的末端烯烃代表了进一步功能化的有用手柄,使其成为全合成中的战略中间体。对于我们的所有底物,串联 Nazarov/ene 环化反应优于 Nazarov/[3+2] 串联反应,与链长无关。氘化研究进一步支持终止烯反应的机理假设。