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 allenic esters afforded ester-substituted functionalized dihydropyran derivatives in high yields along with high enantioselectivities under mild conditions.
β-异cupreidine(β-ICD)催化β,γ-不饱和α-酮酸酯与烯丙酸酯的不对称[4 + 2]环加成反应,可在温和条件下以高收率和高对映选择性提供酯取代的官能化二氢吡喃衍生物。