Cp*Co(III)-Catalyzed C–H/N–N Functionalization of Arylhydrazones for the Synthesis of Isoquinolines
作者:Amit B. Pawar、Darpan Agarwal、Dhanaji M. Lade
DOI:10.1021/acs.joc.6b02001
日期:2016.11.18
Cationic Co(III)-catalyzed C–H/N–N bond functionalization of arylhydrazones with internal alkynes has been developed for the synthesis of isoquinoline derivatives. The arylhydrazones are easy to prepare and require inexpensive and commercially available hydrazine hydrate. The reaction works well with a variety of internal alkynes and arylhydrazones and offers broad scope, good functional group tolerance
(Pentamethylcyclopentadienyl)cobalt(III)-Catalyzed Oxidative [4+2] Annulation of NH Imines with Alkynes: Straightforward Synthesis of Multisubstituted Isoquinolines
作者:Shang-Shi Zhang、Xu-Ge Liu、Shi-Yong Chen、Dong-Hang Tan、Chun-Yong Jiang、Jia-Qiang Wu、Qingjiang Li、Honggen Wang
DOI:10.1002/adsc.201600025
日期:2016.5.19
A synthetic method for isoquinoline synthesis via a [4+2] annulation of NH imines with alkynes using the high‐valent (pentamethylcyclopentadienyl)cobalt(III) [Cp*Co(III)] catalyst is described. Cerium(IV) sulfate was found to be an efficient oxidant in lieu of the commonly used copper or silver salts. Broad substrate scope, high functional group tolerance, and generally good yields were observed.
An efficient synthesis of isoquinolines via rhodium-catalyzed direct C–H functionalization of arylhydrazines
作者:Sai Zhang、Daorui Huang、Guangyang Xu、Shengyu Cao、Rong Wang、Shiyong Peng、Jiangtao Sun
DOI:10.1039/c5ob01171j
日期:——
Rhodium-catalyzed C–H bond activation of arylhydrazines and coupling with internal alkynes has been realized.
铑催化的芳基肼的C-H键活化并与内部炔烃偶联已经实现。
Manganese-Catalyzed Dehydrogenative [4+2] Annulation of NH Imines and Alkynes by CH/NH Activation
作者:Ruoyu He、Zhi-Tang Huang、Qi-Yu Zheng、Congyang Wang
DOI:10.1002/anie.201402575
日期:2014.5.5
Described herein is a manganese‐catalyzed dehydrogenative [4+2] annulation of NH imines and alkynes, a reaction providing highly atom‐economical access to diverse isoquinolines. This transformation represents the first example of manganese‐catalyzed CH activation of imines; the stoichiometric variant of the cyclomanganation was reported in 1971. The redox neutral reaction produces H2 as the major
Redox-Divergent Hydrogen-Retentive or Hydrogen-Releasing Synthesis of 3,4-Dihydroisoquinolines or Isoquinolines
作者:Ke-Han He、Wei-Dong Zhang、Ming-Yu Yang、Kai-Li Tang、Mengnan Qu、You-Song Ding、Yang Li
DOI:10.1021/acs.orglett.6b01091
日期:2016.6.17
A rare Ru-catalyzed highly selective synthesis of 3,4-dihydroisoquinolines or isoquinolines is accomplished via a redox-divergent hydrogen-retentive or hydrogen-releasing fashion. Notably, high cis-selectivity of 3,4-dihydroisoquinolines is achieved. Potential applications are shown by gram-scale reactions and very concise synthesis of N-containing polycyclic aromatic compounds. Primary mechanistic