Nucleophilic addition of (difluoromethyl)trimethylsilane to selected α-imino ketones and aryl diketones
作者:Emilia Obijalska、Greta Utecht、Marcin K. Kowalski、Grzegorz Mlostoń、Michał Rachwalski
DOI:10.1016/j.tetlet.2015.06.025
日期:2015.8
addition of (difluoromethyl)trimethylsilane (CHF2SiMe3) to the carbonyl bond of aryl glyoxal derived α-imino ketones, and selected diaryl 1,2-diketones were studied in the presence of initiators, such as potassium tert-butoxide or caesium fluoride. Subsequent reduction of the obtained α-imino alcohols and α-hydroxy ketones with sodium borohydride gave the expected 2-amino 1-(difluoromethyl)alcohols and
The asymmetric transfer hydrogenation of representative aryl and benzofuranyl 2-tert-butylaminoethanones with formic acid-triethylamine, catalyzed by RhCl[(R,R)-T5DPEN](C5Me5), produced the corresponding beta-tert-butylamino alcohols in 97-99% ee. A short asymmetric synthesis of (R)-bufuralol, a potent beta-adrenergic receptor antagonist, is described. This approach to beta-amino alcohols from ketones circumvents the halogenation-reduction-amination sequence. (C) 2010 Elsevier Ltd. All rights reserved.
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