螺环素 A、C 和 D 是已在海洋真菌菌株 LL-37H248 中鉴定的代谢物。它们独特的多环结构和有趣的生物活性使它们成为合成社区的有吸引力的目标。基于 5-取代萘醌的可扩展对映选择性环氧化、氧化/螺酮缩酮级联、苯酚单元的邻位选择性氯化和肟酯导向的乙酰氧基化、(-)-螺环素 A 和 C 的对映选择性全合成以及已经实现了 (-)-spiroxin D 的首次全合成。
An enantioselective nucleophilic epoxidation of 2-substituted 1,4-naphthoquinones in the presence of a newly developed guanidine–bisurea bifunctional organocatalyst with tert-butyl hydroperoxide (TBHP) as an oxidant is presented. 1,4-Naphthoquinones bearing substituents at C6, C7, and C2 were available for the reaction, and the corresponding epoxides were obtained with 88:12–95:5 er in 71–98% yields