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- W2026753043 abstract "The sodium salts of allyldimethylsilanol and 2-butenyldimethylsilanol undergo palladium-catalyzed cross-coupling with a wide variety of aryl bromides to afford allylated and crotylated arenes. The coupling of both silanolates required extensive optimization to deliver the expected products in high yields. The reaction of the allyldimethylsilanolate takes place at 85 degrees C in 1,2-dimethoxyethane with allylpalladium chloride dimer (2.5 mol %) to afford 73-95% yields of the allylation products. Both electron-rich and sterically hindered bromides reacted smoothly, whereas electron-poor bromides cross-coupled in poor yield because of a secondary isomerization to the 1-propenyl isomer (and subsequent polymerization). The 2-butenyldimethylsilanolate (E/Z, 80:20) required additional optimization to maximize the formation of the branched (gamma-substitution) product. A remarkable influence of added alkenes (dibenzylideneacetone and norbornadiene) led to good selectivities for electron-rich and electron-poor bromides in 40-83% yields. However, bromides containing coordinating groups (particularly in the ortho position) gave lower, and in one case even reversed, selectivity. Configurationally homogeneous (E)-silanolates gave slightly higher gamma-selectivity than the pure (Z)-silanolates. A unified mechanistic picture involving initial gamma-transmetalation followed by direct reductive elimination or sigma-pi isomerization can rationalize all of the observed trends." @default.
- W2026753043 created "2016-06-24" @default.
- W2026753043 creator A5015171633 @default.
- W2026753043 creator A5060673018 @default.
- W2026753043 date "2008-11-11" @default.
- W2026753043 modified "2023-10-16" @default.
- W2026753043 title "Cross-Coupling of Aromatic Bromides with Allylic Silanolate Salts" @default.
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- W2026753043 doi "https://doi.org/10.1021/ja805951j" @default.
- W2026753043 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2748729" @default.
- W2026753043 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18998687" @default.
- W2026753043 hasPublicationYear "2008" @default.
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