Gold-Catalyzed Efficient Formation ofα,β-Unsaturated Ketones from Propargylic Acetates
作者:Meng Yu、Guotao Li、Shaozhong Wang、Liming Zhang
DOI:10.1002/adsc.200600579
日期:2007.4.2
An efficient gold-catalyzed method for the preparation of α,β-unsaturated ketones from propargylic acetates has been developed. Under mild reaction conditions, β-monosubstituted enones were formed mostly with excellent E-selectivity. β,β-Disubstituted enones can be prepared from propargylic acetates derived from ketones. The high efficiency and mild nature of this reaction render it a viable alternative
Gold-catalyzed efficient preparation of linear α-haloenones from propargylic acetates
作者:Meng Yu、Guozhu Zhang、Liming Zhang
DOI:10.1016/j.tet.2008.11.107
日期:2009.2
Versatile linear α-iodo- and α-bromoenones are prepared efficiently from readily accessible propargylic acetates using 2 mol % of Au(PPh3)NTf2. This reaction is easy to execute and has broad substrate scope. Good to excellent Z-selectivities are observed in the cases of propargylic acetates derived from aliphatic aldehydes.
A copper‐mediated one‐pot sequential reaction of terminal alkynes, azides, and propargylic carbonates is reported. The three component reaction occurs readily at room temperature to afford a 5‐allenyl‐1,2,3‐triazoles in high yields, providing a straightforward approach to 1,3,5‐trisubstituted triazoles using easily available Cu(I) reagent.