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A Beilstein Crossfire search on the 30th of August 2009 revealed only 11 entries for the formation of benzimidazolium salts from substituted 1,2-diamino arenes, whereas the alkylation (including activated alkyl groups like benzyl or α-carbonyl) of benzimidazoles was found 322 times.
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For another synthetic route employing only one palladium-catalyzed reaction, starting from 1-bromo-2-nitrobenzene, see
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For convenience, 20 mol % of CuI was used under standard conditions. See the Supporting Information for further details.
-
For convenience, 20 mol % of CuI was used under standard conditions. See the Supporting Information for further details.
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65
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Very recently, a related paper on the 'Synthesis of 1-Substituted Benzimidazoles from o-Bromophenyl Isocyanide and Amines' appeared: Lygin, A. V.; de Meijere, A. Eur. J. Org. Chem. 2009, 5138-5141.
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Very recently, a related paper on the 'Synthesis of 1-Substituted Benzimidazoles from o-Bromophenyl Isocyanide and Amines' appeared: Lygin, A. V.; de Meijere, A. Eur. J. Org. Chem. 2009, 5138-5141.
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