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- W2028598889 endingPage "2546" @default.
- W2028598889 startingPage "2541" @default.
- W2028598889 abstract "Seven primary amine organocatalysts 1a−g were readily prepared from natural primary amino acids via two steps and then were used to catalyze the direct asymmetric aldol reaction, but they showed very poor enantioselectivities and activities. As an effective cocatalyst, 2,4-dinitrophenol (DNP) dramatically elevated the activities and enantioselectivities of these very inefficient primary amine organocatalysts. This remedial course to the very inefficient organocatalysts by selection and employment of the optimal cocatalyst was particularly cost-effective and environment-beneficial compared with de novo development of catalysts. The highest efficient organocatalytic system that was composed of 1f and DNP showed high enantioselectivities and good to high diastereoselectivities with a broad spectrum of seven ketones. The linear ketones and cyclopentanone got predominant syn products whereas cyclohexanone mainly gave anti products." @default.
- W2028598889 created "2016-06-24" @default.
- W2028598889 creator A5012422789 @default.
- W2028598889 creator A5027584292 @default.
- W2028598889 creator A5027783121 @default.
- W2028598889 creator A5031641994 @default.
- W2028598889 creator A5072945850 @default.
- W2028598889 creator A5073598005 @default.
- W2028598889 date "2009-02-27" @default.
- W2028598889 modified "2023-10-11" @default.
- W2028598889 title "2,4-Dinitrophenol as an Effective Cocatalyst: Greatly Improving the Activities and Enantioselectivities of Primary Amine Organocatalysts for Asymmetric Aldol Reactions" @default.
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- W2028598889 doi "https://doi.org/10.1021/jo802758b" @default.