A novel Ireland–Claisen rearrangement/Diels–Alder tandem reaction of propargylic acrylates with acyclic dienophiles
作者:Yun-Xia Li、Yi-Lin Sheng、Bi-Song Zhang
DOI:10.1016/j.cclet.2013.01.004
日期:2013.2
A novel DABCO-catalyzed Ireland–Claisenrearrangement/Diels–Alder tandem reaction of propargylic acrylates 3 with dienophiles 4 was developed in the presence of an excess TMSCl and DBU with 1% hydroquinone as polymerization inhibitor in acetonitrile at refluxing temperature under air. This protocol gave cyclic α,β-unsaturated carboxylic acids 5 with complete regioselectivity.