作者:Phillip S. Grant、Daniel P. Furkert、Margaret A. Brimble
DOI:10.1021/acs.orglett.0c03364
日期:2020.11.6
Leonuketal is an 8,9-seco-labdane terpenoid with a unique tetracyclic structure, owing to a diversity-generating biosynthetic C–C bond cleavage event. The first total synthesis of leonuketal is reported, featuring a Ti(III)-mediated reductive cyclization of an epoxy nitrile ether, an unusual ring-opening alkyne formation as part of an auxiliary ring strategy, and the previously undescribed Au(I)-catalyzed
Leonuketal是8,9-开环-labdane萜类化合物有独特四环结构,由于分集产生的生物合成的C-C键断裂事件。报道了leonuketal的第一个全合成,其特征是钛(III)介导的环氧腈醚的还原环化,作为辅助环策略一部分的不寻常的开环炔烃形成以及先前未描述的Au(I)催化β-酮(烯醇)内酯的环化以组装核心螺酮基序。