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- W4313553206 abstract "The “borrowing hydrogen” (BH) approach for the N-alkylation of phenylenediamines using alcohols as coupling partners is highly challenging due to the selectivity issue of the generated products. Furthermore, the development of base-metal systems that can potentially substitute precious metals with competitive activity is a major challenge in BH catalysis. We present herein an efficient protocol for the N,N′-di-alkylation of aromatic diamines using an in situ-generated Ni–NHC complex from NiCl2 and the ligand L1, which gave access to a wide range of N,N′-di-alkylated orthophenylene diamines (rather than the generally observed benzimidazole derivatives), meta- and para-phenylene diamines along with 2,6-diamino pyridine derivatives in good to excellent yields. Moreover, the catalyst system was also successful in the derivatization of a clinically important drug molecule, Dapsone. Notably, the present protocol could be applied effectively to synthesize unsymmetrically substituted N,N′-di-alkylated diamines via sequential alkylation and is the first report in the base-metal system to the best of our knowledge. Diverse control experiments including the deuterium incorporation studies suggest that the present protocol proceeds via a BH sequence." @default.
- W4313553206 created "2023-01-06" @default.
- W4313553206 creator A5025967980 @default.
- W4313553206 creator A5055786275 @default.
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- W4313553206 date "2023-01-05" @default.
- W4313553206 modified "2023-09-26" @default.
- W4313553206 title "N-Heterocyclic Carbene-Supported Nickel-Catalyzed Selective (Un)Symmetrical N-Alkylation of Aromatic Diamines with Alcohols" @default.
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- W4313553206 doi "https://doi.org/10.1021/acs.joc.2c02639" @default.
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