Total Synthesis of Boletopsin 11 Enabled by Directed <i>ortho</i>-C(sp<sup>2</sup>)–H Arylation
作者:Meng Yao Zhang、Russell A. Barrow
DOI:10.1021/acs.joc.8b00792
日期:2018.6.15
A nine-step synthesis of boletopsin 11 (1), a bioactive fungal natural product, is disclosed. Key features include a one-pot [O]-oxa-Michael cascade to establish the polyoxygenated dibenzofuran core followed by a Pd-catalyzed directed ortho-C(sp2)–H arylation to complete the fully functionalized carbon skeleton. Exploration of the latter transformation led to the discovery of an unexpected tandem ortho-C(sp2)–H
公开了生物活性真菌天然产物血球蛋白11(1)的九步合成。主要功能包括一锅[O] -oxa-Michael级联反应,以建立多加氧的二苯并呋喃核,然后进行Pd催化的定向邻-C(sp 2)-H芳基化反应,以完成完全官能化的碳骨架。对后一种转化的探索导致意外的串联邻位-C(sp 2)-H芳基化事件的发现,并通过立体电子中不同的偶联伙伴进一步研究了定向邻位-C(sp 2)-H反应的范围特性。