Hetero-Diels–Alder Reaction of Phosphinyl and Phosphonyl Nitroso Alkenes with Conjugated Dienes: An Aza-Cope Rearrangement
作者:Jesús M. de los Santos、Roberto Ignacio、Gloria Rubiales、Domitila Aparicio、Francisco Palacios
DOI:10.1021/jo201116u
日期:2011.8.19
Phosphorylated nitroso alkenes react with cyclic dienes such as cyclopentadiene or cyclohexadiene to afford hetero Diels–Alder-type cycloadducts where the nitroso alkene participates as dienophile component and the cyclic olefin acts as the 4π-electron (diene) system. Subsequent aza-Cope rearrangement affords highly functionalized 5,6-dihydro-4H-1,2-oxazines. Conversely, the reaction of TMS-substituted
磷酸化的亚硝基烯烃与环二烯(例如环戊二烯或环己二烯)反应,生成杂Diels–Alder型环加合物,其中亚硝基烯烃作为亲二烯体组分参与其中,环烯烃充当4π电子(二烯)系统。随后的aza-Cope重排提供了高度官能化的5,6-二氢-4 H -1,2-恶嗪。相反,TMS取代的环戊二烯(双亲体)与亚硝基烯烃作为杂二烯的反应直接导致双环1,2-恶嗪。理论研究与实验结果以及提出的新aza-Cope重排相符。