Palladium‐Catalyzed Cascade to Benzoxepins by Using Vinyl‐Substituted Donor–Acceptor Cyclopropanes
作者:Matteo Faltracco、Koen N. A. Vrande、Martijn Dijkstra、Jordy M. Saya、Trevor A. Hamlin、Eelco Ruijter
DOI:10.1002/anie.202102862
日期:2021.6.21
A palladium-catalyzed intermolecular cascade (4+3) cyclocondensation of salicylaldehydes and vinylcyclopropanes is reported. A key feature of the reaction is the use of a phosphonate group as an acceptor moiety on the cyclopropane, exploiting its propensity to undergo olefination with aldehydes. Subsequent O-allylation enabled the formation of a range of substituted benzoxepinsWith a novel chiral ligand
报道了水杨醛和乙烯基环丙烷的钯催化分子间级联 (4+3) 环缩合反应。该反应的一个关键特征是使用膦酸酯基团作为环丙烷上的受体部分,利用其与醛进行烯化的倾向。随后的 O-烯丙基化能够形成一系列具有新型手性配体的取代苯并氧杂环己烷,产物通常具有良好的产率和合理的对映选择性。