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.
作者:Ku̧, Melih、Artok, Özge Aksin、Ziyanak, Firat、Artok, Levent
DOI:10.1055/3-2008-1078047
日期:——
Phosphine-catalyzed activation of cyclopropenones: a versatile C<sub>3</sub> synthon for (3+2) annulations with unsaturated electrophiles
作者:Xin He、Pengchen Ma、Yuhai Tang、Jing Li、Shenyu Shen、Martin J. Lear、K. N. Houk、Silong Xu
DOI:10.1039/d2sc04092a
日期:——
α-ketenyl phosphorous ylide is validated as the key intermediate, which undergoes preferential catalytic cyclization with aldehydes rather than stoichiometric Wittig olefinations. This phosphine-catalyzed activation of cyclopropenones thus supplies a versatile C3 synthon for formal cycloadditon reactions.