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- W2089336861 abstract "The synthesis of 4-dialkylaminopyridines can be accomplished in two steps starting from pyridine. Compared to pyridine, these derivatives are approximately 104 times more active when used as acylation catalysts. Dialkylaminopyridines are being used with ever-increasing frequency for acylation reactions which proceed either incompletely or not at all in pyridine. This article reviews the various possible applications of 4-dialkylaminopyridines in terpene, steroid, carbohydrate and nucleoside chemistry as well as in the transformation of amino acids into α-acyl aminoketones and polymerization of isocyanates. In addition, N-substituted 4-dialkylaminopyridinium salts can be used for the transfer of sensitive groups to nucleophiles in aqueous medium. The exceptional catalytic effect of these derivatives, even in non-polar solvents, is due, in part, to the formation of high concentrations of N-acylpyridinium salts which are present in solution as loosely-bound, highly reactive ion pairs." @default.
- W2089336861 created "2016-06-24" @default.
- W2089336861 creator A5007417950 @default.
- W2089336861 creator A5033051833 @default.
- W2089336861 creator A5057441079 @default.
- W2089336861 date "1978-08-01" @default.
- W2089336861 modified "2023-10-11" @default.
- W2089336861 title "4-Dialkylaminopyridines as Highly Active Acylation Catalysts. [New synthetic method (25)]" @default.
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- W2089336861 doi "https://doi.org/10.1002/anie.197805691" @default.
- W2089336861 hasPublicationYear "1978" @default.
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