Alkynes react with organoborons under a CO atmosphere in the presence of a rhodium(I) catalyst to afford mainly 5-aryl-2(5H)-furanones, α,β-unsaturated ketones, and indanones. The product selectivity can be tuned by modifying the reaction conditions.
Intermolecular [2+2+1] Carbonylative Cycloaddition of Aldehydes with Alkynes, and Subsequent Oxidation to γ-Hydroxybutenolides by a Supported Ruthenium Catalyst
作者:Hiroki Miura、Kazuki Takeuchi、Tetsuya Shishido
DOI:10.1002/anie.201507814
日期:2016.1.4
Intermolecular [2+2+1] carbonylativecycloaddition of aldehydes with alkynes and subsequentoxidation to γ‐hydroxybutenolides is achieved using a supportedrutheniumcatalyst. A ceria‐supportedrutheniumcatalyst promotes the reaction efficiently, even with an ambient pressure of CO or without external CO, thus giving the corresponding γ‐hydroxybutenolide derivatives in good to high yields. Moreover
Cross-Coupling of Meyer–Schuster Intermediates under Dual Gold–Photoredox Catalysis
作者:Jiwon Um、Hokeun Yun、Seunghoon Shin
DOI:10.1021/acs.orglett.5b03531
日期:2016.2.5
Under dual gold/photoredoxcatalyticconditions, intermediates from the Meyer–Schuster rearrangement underwent an efficient cross-coupling with arene diazoniumsalts, leading to α-arylated enones. Diazoniumsalts assisted the dissociation of the propargyl hydroxyl group by forming alkoxydiazenes in the Meyer–Schuster rearrangement, and the coupling was proposed to proceed through an allenyl methyl