[EN] QUINOLINE 4-CARBOXAMIDE DERIVATIVES AND THEIR USE AS NEUROKININ 3 (NK-3) RECEPTOR ANTAGONISTS [FR] DERIVES DE QUINOLEINE 4-CARBOXAMIDE ET LEUR UTILISATION COMME ANTAGONISTES DU RECEPTEUR DE LA NEUROKININE 3 (NK-3)
Rhodium‐Catalysed [4+2] Annulation of Aromatic Oximes with Terminal Alkenes by C−H/N−O Functionalization towards 3,4‐Dihydroisoquinolines
作者:Xu Zhang、Xuan‐Hui Ouyang、Yang Li、Bo Chen、Jin‐Heng Li
DOI:10.1002/adsc.201900922
日期:2019.11.5
Rhodium (Rh)‐catalysed [4+2] annulation of aromatic oximes with common terminal alkenes for the synthesis of 3,4‐dihydroisoquinolines is presented. Through the cooperation of a Rh(III) catalyst and a catalytic amount of K2HPO4 base, the reaction enables the formation of two new bonds, a C(sp2)−C(sp3) bond and a C(sp3)−N bond, in a single reaction via functionalization of both the C−H and N−O bonds
AbstractFlash vacuum thermolysis of the parent and phenyl substituted N‐acyl cyclobutylimines 3 was under investigation. At 500 °C and 0.01 torr, 3d with phenyl group on C‐1 and 3e with phenyl group on C‐2 of cyclobutane ring underwent ring expansion processes to produce N‐acyl 1,2,3,4‐tetrahydropyridines 8d and 8e. Meanwhile the parent N‐acyl cyclobutylimines 3a together with the phenyl group on C‐3 (3c) and imine carbon (3b) proceeded a hydrogen shift reaction to afford N‐acylaminomethylenecyclobutanes 8a‐c. In addition, cycloreversion competed with ring expansion or hydrogen shift in all cases.