Easy access to synthesize isoquinolines from aryl ketoximes and internal alkynes via Iridium (III)-catalyzed C H/N O bond activation
作者:Wei Lin、Xiu-Xiu Hu、Cang-Wei Zhuang、Ya-Zhen Wang
DOI:10.1016/j.tet.2019.04.039
日期:2019.5
A highly efficient approach to synthesize isoquinoline derivatives through Iridium(III)-catalyzed cyclization of aryl ketoximes and internal alkynes without oxidant is reported. A broad range isoquinolines are obtained in good to excellent yields and various functional groups are well tolerated.
Rhodium-Catalyzed Oxidative Cycloaddition of <i>N</i>
-<i>tert</i>
-Butoxycarbonylhydrazones with Alkynes for the Synthesis of Functionalized Pyrroles <i>via</i>
C(<i>sp</i>
<sup>3</sup>
)-H Bond Functionalization
作者:Chun-Ming Chan、Zhongyuan Zhou、Wing-Yiu Yu
DOI:10.1002/adsc.201600900
日期:2016.12.22
The reaction features a regioselective α‐imino alkyl C(sp3)−H bond functionalization resulting in selective formation of highlyfunctionalized NH‐free pyrroles. Our studies showed that utilizing the N‐tert‐butoxycarbonyl (N‐Boc) as the oxidizing directing group is critical for achieving the observed pyrrole formation versus the isoquinoline formation. To account for the pyrrole formation, we hypothesized
An efficient RhIII-catalyzed ortho-C-H bond activation for the synthesis of substituted isoquinolines and heterocycle-fusedpyridines in aqueousmedium has been developed. This method involves the in situ generation of ketimines from ketones and ammonium acetate and subsequent oxidative C-H bond activation/annulation of ketimines with alkynes to form the C-C/C-N bonds spontaneously. Various aryl ketones
Cationic Ruthenium Catalysts for Alkyne Annulations with Oximes by C–H/N–O Functionalizations
作者:Christoph Kornhaaß、Jie Li、Lutz Ackermann
DOI:10.1021/jo301768b
日期:2012.10.19
Cationic ruthenium(II) complexes enabled efficient redox-neutral annulations of alkynes with readily available oximes. The catalytic dehydrative C-H/N-O bond functionalization proved to be broadly applicable and was shown to proceed through a reversible cyclometalation.