Replacement of Stoichiometric DDQ with a Low Potential <i>o</i>-Quinone Catalyst Enabling Aerobic Dehydrogenation of Tertiary Indolines in Pharmaceutical Intermediates
作者:Bao Li、Alison E. Wendlandt、Shannon S. Stahl
DOI:10.1021/acs.orglett.9b00111
日期:2019.2.15
(phd = 1,10-phenanthroline-5,6-dione), is shown to be effective for aerobic dehydrogenation of 3° indolines to the corresponding indoles. The results show how low potential quinones may be tailored to provide a catalytic alternative to stoichiometric DDQ, due to their ability to mediate efficient substrate dehydrogenation while also being compatible with facile reoxidation by O2. The utility of the
Artificial Light‐Harvesting Systems Based on AIEgen‐branched Rotaxane Dendrimers for Efficient Photocatalysis
作者:Wei‐Jian Li、Xu‐Qing Wang、Dan‐Yang Zhang、Yi‐Xiong Hu、Wei‐Tao Xu、Lin Xu、Wei Wang、Hai‐Bo Yang
DOI:10.1002/anie.202106035
日期:2021.8.16
harvesting, the precise synthesis of a new family of AIEgen-branched rotaxane dendrimers was successful realized from an AIEgen-functionalized [2]rotaxane through a controllable divergent approach. In the resultant AIE macromolecules, up to twenty-one AIEgens located at the tails of each branches, thus making them the first successful example of AIEgen-branched dendrimers. Attributed to the solvent-induced
Cobalt(II)/<i>N</i>-Hydroxyphthalimide-Catalyzed Cross-Dehydrogenative Coupling Reaction at Room Temperature under Aerobic Condition
作者:Mahendra R. Patil、Noopur P. Dedhia、Anant R. Kapdi、A.Vijay Kumar
DOI:10.1021/acs.joc.8b00203
日期:2018.4.20
This work reports a cobalt(II)/N-hydroxyphthalimide (NHPI)-catalyzed cross-dehydrogenative oxidative coupling of N-aryl tetrahydroisoquinolines with various pro-nucleophiles, such as indoles, nitroalkanes, and trialkylphosphites, active methylene compounds, and other nucleophiles, such as cyanide (ethyl cyanoformate), at room temperature under aerobic conditions. The present protocol is operationally
A novel stable radical cation triarylaminiumsalt able to induce aerobic oxidative α-C–H functionalization of tertiary amines in catalytic amounts has been developed. The reaction is performed in the absence of any other additives under mild conditions and only requires atmosphere air as a sustainable co-oxidant.
作者:Yarabhally R. Girish、Komal Jaiswal、Pranav Prakash、Mrinmoy De
DOI:10.1039/c8cy02532k
日期:——
along with EosinY as a photosensitizer. But the potential of this reaction has not yet been fully explored as the sacrificial donor is wasted in the oxidation process. The oxidation cycle of this process can be used in many organic transformation(s). Herein, we report the use of the oxidative cycle for efficient cross dehydrogenative coupling (CDC) reaction with tetrahydroisoquinoline and indole substrates