(±)-Fredericamycin A 1 is synthesized using 5-exo-digonal radical closure of selenide 15(Scheme 2), and an unusual procedure for both selective demethylation of the advanced intermediate 22 and adjustment of the stereochemistry in the pentadienyl side chain.
(±)-Fredericamycin A 1 的合成采用了
硒化物 15 的 5-外向二元自由基闭合(方案 2),以及对高级中间体 22 进行选择性去甲基化和调整
戊二烯侧链的立体
化学的不寻常程序。