Application of Nazarov type electrocyclization to access [6,5,6] and [6,5,5] core embedded new polycycles: an easy entry to tetrahydrofluorene scaffolds related to Taiwaniaquinoids and C-nor-D homosteroids
作者:Ritesh Singh、Gautam Panda
DOI:10.1039/c0ob00892c
日期:——
An easy, efficient and concise approach to tetrahydrofluorene [6,5,6]ABC tricyclic core embedded new polycycles has been achieved under relatively mild and catalytic Nazarov type electrocyclization conditions, using 2 mol% of Sc(OTf)3 in anhydrous DCM (dichloromethane) at room temperature, with high yields. The generality of the reaction has been illustrated by synthesizing diverse polycycles embedded with rare heterotricyclic [6,5,5]ABC skeletons.
在相对温和和催化的纳扎罗夫型电环化条件下,已经实现了一种简单、高效且简洁的方法,用于合成嵌入新多环的四氢氟烯[6,5,6]ABC三环核心,使用2 mol% Sc(OTf)3在无水DCM(氯仿)中于室温反应,获得了高产率。通过合成嵌入稀有异三环[6,5,5]ABC骨架的多样化多环,展示了该反应的普遍性。