Synthesis of optically active dihydropyrans from asymmetric [4 + 2] cycloaddition of β,γ-unsaturated α-ketoesters with allenic esters
作者:Cheng-Kui Pei、Yu Jiang、Min Shi
DOI:10.1039/c2ob25475a
日期:——
β-Isocupreidine (β-ICD) catalyzed asymmetric [4 + 2] cycloaddition of β,γ-unsaturated α-ketoesters with allenicesters afforded ester-substituted functionalizeddihydropyran derivatives in high yields along with high enantioselectivities under mild conditions.