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。