Stereoselective Syntheses of Trisubstituted Olefins via Platinum Catalysis: α-Silylenones with Geometrical Complementarity
作者:Douglas A. Rooke、Eric M. Ferreira
DOI:10.1021/ja1058197
日期:2010.9.1
The stereoselective syntheses of alpha-silylenones using catalytic PtCl(2) are reported. Via alkyne activation, alpha-hydroxypropargylsilanes are converted to (Z)-silylenones through a highly selective silicon migration. The complementary (E)-silylenones are accessed by a regioselective hydrosilylation of the ynone precursor. The synthetic utility of these compounds is demonstrated in cross-coupling
Intermolecular Schmidt reaction of alkyl azides with acyl silanes
作者:Chun-Jiao Yu、Rui Li、Peiming Gu
DOI:10.1016/j.tetlet.2016.06.124
日期:2016.8
The first intermolecular Schmidt reaction of alkyl azides with acyl silanes has been designed and realized, producing a range of amides with absolute site selectivity in good to excellent yields. The mechanism of the conversion has been proposed, and the reaction exhibits scope of substrates.
1,2-Amino Alcohols via Cr/Photoredox Dual-Catalyzed Addition of α-Amino Carbanion Equivalents to Carbonyls
作者:J. Luca Schwarz、Roman Kleinmans、Tiffany O. Paulisch、Frank Glorius
DOI:10.1021/jacs.9b12053
日期:2020.2.5
Herein, we report the synthesis of protected 1,2-aminoalcohols starting from carbonyl compounds (mostly aldehydes) and α-silyl amines. The reaction is enabled by a Cr/photoredox dual catalytic system that allows the in situ generation of α-amino carbanion equivalents which act as nucleophiles. The unique nature of this reaction was demonstrated through the aminoalkylation of ketones and an acyl silane
3-dithianes using 30% hydrogen peroxide catalyzed by iron(III) acetylacetonate–sodium iodide. The use of niobium(V) chloride as a catalyst instead of iron(III) acetylacetonate was also effective, except in synthesizing some acyltrimethylsilanes. Acylsilanes were obtained efficiently from dedithioacetalization of 2-silylated 1,3-dithianes using 30% hydrogen peroxide catalyzed by iron(III) acetylacetonate–sodium
Acylsilanes can easily be prepared by the anodic oxidation of 2-alkyl-2-trialkylsilyl-1, 3-dithianes with a platinum anode in wet acetonitrile. This electrochemical reaction provides a general and convenient access to aroyl, saturated and α, β-unsaturated acylsilanes.