An economical approach to α‐CF3‐substituted ketones, which are important intermediates in synthetic and medicinal chemistry, employs olefins and the readily available Langlois reagent (CF3SO2Na). The reaction is operationally simple, proceeds at room temperature, and exhibits an excellent tolerance toward a wide variety of functional groups.
一种经济的方法,以α-CF 3 -取代的酮,这是在合成和药物化学的重要中间体,采用烯烃和容易得到的试剂朗格卢瓦(CF 3 SO 2 Na)的。该反应操作简单,在室温下进行,并且对多种官能团表现出优异的耐受性。
Highly selective electroreductive linear dimerization of electron-deficient vinylarenes
A direct electroreductivedimerization of electron-deficient vinylarenes for the synthesis of 1,4-diarylbutane has been developed using a simple undivided cell with inexpensive carbonelectrodes at room temperature. The control and deuterium-labeling experiments of electroreductivedimerization suggest that the hydrogen source comes from the solvent CH3CN. This protocol provides a mild and efficient
Catalytic alkene difunctionalization via Si−H and C−H activations represents an ideal atom‐ and step‐economic pathway for quick assembly of molecular complexity. We herein developed a visible‐light‐promoted metal‐free difunctionalization of alkenesusing abundant CO2 and readily available Si−H and C(sp3)−H bonds as feedstocks. Through the merger of photoredox and hydrogen‐atom‐transfer catalysis, a
Chemo- and Regioselective Organo-Photoredox Catalyzed Hydroformylation of Styrenes via a Radical Pathway
作者:He Huang、Chenguang Yu、Yueteng Zhang、Yongqiang Zhang、Patrick S. Mariano、Wei Wang
DOI:10.1021/jacs.7b05082
日期:2017.7.26
Importantly, under the optimized reaction conditions the benzylic radical formed in this manner is reduced by SET from the anion radical of 4CzIPN to generate a benzylic anion. Finally, protonation produces the hydroformylation product. By using the new protocol, aldehydes can be generated regioselectively in up to 90% yield. A broad array of functional groups is tolerated in the process, which takes place
dissociation energy. Here we report a divergent radical transformation of a rich library of structurally diverse gem-dichloroalkanes by the controllable dechloroalkylation of alkenes by excited-state dinuclear gold catalysis. The gem-dichloroalkanes can be used to assemble C(sp3)–C(sp3) bonds as a chloroalkyl radical, an alkyl radical cation and a carbeneequivalent precursor for carbon-chain propagation