Hydroxylamine-<i>O</i>
-Sulfonic Acid (HOSA) as a Redox-Neutral Directing Group: Rhodium Catalyzed, Additive Free, One-Pot Synthesis of Isoquinolines from Arylketones
作者:Pragati Biswal、Bedadyuti Vedvyas Pati、Rajesh Chebolu、Asit Ghosh、P. C. Ravikumar
DOI:10.1002/ejoc.201901825
日期:2020.2.28
A new reactivity of hydroxylamine‐O‐sulfonic acid (HOSA) has been demonstrated as redox‐neutral directing group for rhodium‐catalyzed one‐pot synthesis of diverse isoquinolines. This protocol reveals the utility of HOSA as a dircting group for the addditive free C–H/N–O annulations. Moreover, the in situ cleavage of the directing group reduces one step making it as a step‐economical process.
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。
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
Cobalt-catalyzed redox-neutral synthesis of isoquinolines: C–H activation assisted by an oxidizing N–S bond
作者:Fen Wang、Qiang Wang、Ming Bao、Xingwei Li
DOI:10.1016/s1872-2067(16)62491-9
日期:2016.8
A redox-neutral avenue to access isoquinolines has been realized by a Co(Ⅲ)-catalyzed C-H activation process. Starting from readily available N -sulfinyl imine substrates and alkynes, the reaction occurred via N-S cleavage with broad substrate scope and functional group compatibility in the presence of cost-effective cobalt catalysts.
Visible-Light Photoredox-Catalyzed Iminyl Radical Formation by N–H Cleavage with Hydrogen Release and Its Application in Synthesis of Isoquinolines
作者:Wan-Fa Tian、Dang-Po Wang、Shao-Feng Wang、Ke-Han He、Xiao-Ping Cao、Yang Li
DOI:10.1021/acs.orglett.8b00193
日期:2018.3.2
An unprecedented visible-light photoredox-catalyzed iminyl radical formation by N-H cleavage with H2 release has been developed. Itsapplication in the synthesis of various isoquinolines and related polyaromatics in high atom economy at ambient temperature by applying a photosensitizer, Acr+-Mes ClO4-, and a new cobalt catalyst, Co(dmgH)2(4-CONMe2Py)Cl is reported. Mechanistic investigations indicated