DABCO-catalyzed regioselective cyclization reactions of β,γ-unsaturated α-ketophosphonates or β,γ-unsaturated α-ketoesters with allenic esters
作者:Cheng-Kui Pei、Lei Wu、Zhong Lian、Min Shi
DOI:10.1039/c1ob06507f
日期:——
Highly efficient DABCO-catalyzed [4 + 2] cycloaddition of β,γ-unsaturatedα-ketophosphonates or β,γ-unsaturated α-ketoesters with allenicesters gives the corresponding highlyfunctionalized tetrahydropyran and dihydropyran derivatives in good to excellent yields and moderate to good regioselectivities under mild conditions.