Diversity-Oriented Synthesis through Rh-Catalyzed Selective Transformations of a Novel Multirole Directing Group
作者:Bo Su、Jiang-bo Wei、Wen-lian Wu、Zhang-jie Shi
DOI:10.1002/cctc.201500410
日期:2015.9.14
functionalization, directing‐group strategy was developed for the improvement of chemical reactivity and selectivity. Recently, to avoid the inherent limitations of traditional mono‐role directinggroups, a dual‐role oxidizing‐directing‐group strategy was developed, in which the directinggroup acts both as directinggroup and oxidant. Herein, we report a multiroledirectinggroup, which possesses multiple
coupling and cyclization of NH isoquinolones with olefins has been realized. Most isoindolo[2,1-b]isoquinolin-5(7H)-one derivatives were obtained in moderate to good yields. Several derivatization reactions including functional group conversion and further CH/olefin coupling were also performed. This transformation realized the less developed Cp*Ir(III) catalyzed coupling and cyclization reaction of
已经实现了铱催化的NH异喹诺酮与烯烃的氧化偶联和环化。大多数异吲哚[2,1- b ]isoquinolin-5(7H)-one 衍生物以中等至良好的产率获得。还进行了几个衍生反应,包括官能团转化和进一步的 C H /烯烃偶联。这种转化实现了较少开发的 Cp*Ir(III) 催化的 NH 底物与烯烃的偶联和环化反应。
Rhodium-Catalyzed Annulative Coupling Using Vinylene Carbonate as an Oxidizing Acetylene Surrogate
作者:Koushik Ghosh、Yuji Nishii、Masahiro Miura
DOI:10.1021/acscatal.9b04254
日期:2019.12.6
Transition-metal-catalyzed C–Hactivation and subsequent oxidative cyclization with alkynes has been a powerful tool for the synthesis of polycyclic aromatic compounds. Despite the substantial progress in this field, it is still a significant challenge to establish synthetic methodologies for the construction of nonsubstituted vinylene-fused aromatics. We herein report a Rh(III)-catalyzed C–H/N–H annulation with vinylene
The oxidative cyclization of aromatic and heteroaromatic nitriles with alkynes in the presence of a catalytic amount of [RuCl2(p-cymene)}2], Cu(OAc)2.H2O and KPF6 in acetic acid under air gave isoquinolones in good to excellent yields.
N-Iminopyridinium ylide-directed, cobalt-catalysed coupling of sp<sup>2</sup> C–H bonds with alkynes
作者:Se Hun Kwak、Olafs Daugulis
DOI:10.1039/d0cc05294a
日期:——
N-Iminopyridinium ylides are used as directing groups and internal oxidants for cobalt-catalysed annulation of sp2 C–H bonds with internal alkynes. The reactions possess excellent compatibility with heterocyclic substrates.