- Ruthenium-catalyzed meta/ortho-selective C-H alkylation of azoarenes using alkyl bromides
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meta/ortho-Selective CAr-H (di)alkylation reactions of azoarenes have been achieved via [Ru(p-cymene)Cl2]2 catalyzed ortho-metalation using various types of alkyl bromides. Particularly, dual meta-alkylation of azoarene and reduction offer an attractive strategy for the synthesis of meta-alkylanilines, which are difficult to access via traditional aniline functionalization methods.
- Li, Gang,Ma, Xingxing,Jia, Chunqi,Han, Qingqing,Wang, Ya,Wang, Junjie,Yu, Liuyang,Yang, Suling
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supporting information
p. 1261 - 1264
(2017/02/05)
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- Palladium-Catalyzed Oxidative Synthesis of Unsymmetrical Azophenols
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A straightforward palladium-catalyzed oxidative hydroxylation of azobenzenes is reported. The developed methodology tolerates various functional groups and allows the synthesis of diverse unsymmetrical azophenols under mild conditions in good to excellent yields. A complementary procedure was also investigated by in situ generation of PIFA. This study represents the first general method for the synthesis of o-hydroxyazobenzenes starting from simple azoarenes.
- Nguyen, Thi Hong Long,Gigant, Nicolas,Delarue-Cochin, Sandrine,Joseph, Delphine
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p. 1850 - 1857
(2016/03/15)
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- Lead-Catalyzed Synthesis of Azo Compounds by Ammonium Acetate Reduction of Aromatic Nitro Compounds
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Lead/ammonium acetate is a convenient reagent for the reduction of aromatic nitro compounds to the corresponding symmetrically substituted azo compounds. Various azo compounds containing additional reducible substituents such as halogen, nitrile, acid, phenol, ester, methoxy, etc., functions have been synthesized in a single step by the use of this reagent. The conversion is reasonably fast, clean, high yielding and occurs at room temperature in methanol.
- Srinivasa,Abiraj,Gowda, D. Channe
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p. 4221 - 4227
(2007/10/03)
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- 1,2-Didehydroazepines from the Photolysis of Substituted Aryl Azides: Analysis of Their Chemical and Physical Properties by Time-Resolved Spectroscopic Methods
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A series of substituted 1,2-didehydroazepines was prepared by photolysis of their precursor aryl azides.The chemical and physical properties of the didehydroazepines were probed by means of conventional chemical trapping experiments and by time-resolved spectroscopy with IR and UV detection.The didehydroazepines are formed from the azides with efficiencies that depend systematically on the nature of the substituent.In some cases, didehydroazepines are not formed at all.The didehydroazepines react relatively rapidly with starting aryl azide and with added amines.The rate of their reaction is largely controlled by the electronic properties of the substituent on the didehydroazepine.These results permit prediction of the reactivity of didehydroazepines from their structure.
- Li, Yu-Zhuo,Kirby, John P.,George, Michael W.,Poliakoff, Martyn,Schuster, Gary B.
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p. 8092 - 8098
(2007/10/02)
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