Gold(I)-Catalyzed Cyclization/Carbonylation Cascade Reaction of 1,6-Diynes: An Access to β,γ-Unsaturated Ketones
作者:Ming Bao、Wei Lu、Yanping Cai、Lihua Qiu、Xinfang Xu
DOI:10.1021/acs.joc.7b02461
日期:2017.12.15
A gold-catalyzed cyclization/carbonylation cascade reaction of 1,6-diynes is reported. The reaction goes through 6-exo-dig and 6-endo-dig cyclizations in sequence, followed by hydration to provide the β,γ-unsaturated ketones with moderate to high yields under mild reaction conditions. This is the first example of intercepting the postulated 1,3-oxazine vinylgold intermediate with another pendant alkyne
报道了金催化的1,6-二炔的环化/羰基化级联反应。该反应依次经历6 -exo-dig和6 -endo-dig环化,然后水合以在温和的反应条件下以中等至高产率提供β,γ-不饱和酮。这是第一个假定的1,3-恶嗪乙烯基金中间体与另一侧链炔烃截获的第一个例子,这不仅验证了所提出的机理,而且还为酮产物提供了环化的1,2,3,6-四氢吡啶或3,6-来自相应二炔的二氢-2 H-吡喃骨架。