Highly Selective Entry to the Azadirachtin Skeleton via a Claisen Rearrangement/Radical Cyclization Sequence
作者:Thomas Durand-Reville、Luca B. Gobbi、Brian Lawrence Gray、Steven V. Ley、James S. Scott
DOI:10.1021/ol0201557
日期:2002.10.1
[formula: see text] A highly diastereoselective, microwave-induced Claisen rearrangement of an appropriately substituted propargylic enol ether allows the formation of the sterically congested C8-C14 bond of azadirachtin. When combined with a radical-mediated cyclization of the corresponding allene, this sequence offers rapid entry to the framework of azadirachtin.
适当取代的炔丙基烯醇醚的高度非对映选择性的,微波诱导的克莱森重排,可以形成印ach素的空间拥挤的C8-C14键。当与相应的烯丙基的自由基介导的环化结合时,该序列可快速进入印za素的构架。