Lewis Acid Catalyzed [3+3] Annulation of Donor-Acceptor Cyclopropanes with γ-Hydroxyenones: Access to Highly Functionalized Tetrahydropyrans
作者:Keshab Mondal、Subhas Chandra Pan
DOI:10.1002/ejoc.201601305
日期:2017.1.18
Donor–acceptor cyclopropanes were engaged in a [3+3]-annulation reaction with γ-hydroxyenones. Sc(OTf)3 was found to be the best catalyst, and 2,4,4,5-tetrasubstituted tetrahydropyran products were obtained in good yields under mild reaction conditions. The generality of the reaction permitted the synthesis of tetrasubstituted tetrahydropyrans bearing aryl, alkyl, and heteroaromatic groups. A catalytic
供体-受体环丙烷与γ-羟基烯酮进行[3+3]-环化反应。Sc(OTf)3被发现是最好的催化剂,在温和的反应条件下以良好的收率获得了2,4,4,5-四取代四氢吡喃产物。该反应的普遍性允许合成带有芳基、烷基和杂芳族基团的四取代四氢吡喃。还使用手性 PyBOX 配体初步研究了该过程的催化不对称变体。