Enantioselective Synthesis of Indole-Fused Dihydropyranones via Catalytic Cycloaddition of Ketenes and 3-Alkylenyloxindoles
作者:Hui Lv、Xiang-Yu Chen、Li-hui Sun、Song Ye
DOI:10.1021/jo101318u
日期:2010.10.15
Chiral N-heterocyclic carbenes were found to be efficient catalysts for the formal [4+2] cycloaddition reaction of alkyl(aryl)ketenes and 3-alkylenyloxindoles to give the corresponding 3,4-dihydropyrano[2,3-b]indol-2-ones in excellent yields with good diastereo- and enantioselectivities.
发现手性N-杂环卡宾是有效的催化剂,用于烷基(芳基)乙烯酮和3-亚烷基氧吲哚的正式[4 + 2]环加成反应,得到相应的3,4-二氢吡喃并[2,3 - b ]吲哚-2 -具有优异的非对映选择性和对映选择性的高收率化合物。