Gold and platinum catalyzed cascade reaction of propargyl acetates bearing terminal alkynes or methyl ketones
作者:Taichi Kusakabe、Keisuke Kato
DOI:10.1016/j.tet.2010.12.010
日期:2011.2
A gold (III)-catalyzed cascade reaction of propargyl acetates bearing an extra terminal alkyne (1) afforded γ-keto esters 3 and lactones 4. These products should be generated through allenyl ketone intermediate B via a 1,2-acyloxy cyclization/fragmentation/cycloisomerization/hydrolysis sequence. On the other hand, the cascade reaction of α-acetoxy ketones bearing terminal alkynes 5 afforded lactone
金(III)催化的带有额外末端炔烃的炔丙基乙酸酯的级联反应(1)提供了γ-酮酸酯3和内酯4。这些产物应通过1,2-酰氧基环化/片段化/环异构化/水解顺序通过烯基酮中间体B生成。另一方面,带有末端炔烃5的α-乙酰氧基酮的级联反应通过烯丙基酮中间体A提供内酯6。该反应涉及[3,3]-σ酰氧基重排/环异构化/水解序列。