The first totalsynthesis of hirtellanines A is described. The key transformations include (i) base-mediated regioselective pyran ring formation, (ii) one-pot sequential boronation and Suzuki–Miyaura cross-coupling, and (iii) a tandem acid-induced deprotection and subsequent tautomerizations.
The totalsynthesis of Hirtellanine A was accomplished by two different synthetic approaches. Hirtellanine A was assembled using a one-pot, tandem acid-mediated deprotection and tautomerization cascade starting from quinone derivative 23. The key features of the synthesis include a Houben–Hoesch reaction of aryl cyanide 3 with phloroglucinol, a one-pot sequential boronation, a Suzuki–Miyaura cross-coupling
Hirtlanine A 的全合成是通过两种不同的合成方法完成的。Hirtellanine A 使用从醌衍生物 23 开始的一锅串联酸介导的脱保护和互变异构化级联反应组装。 合成的主要特征包括芳基氰化物 3 与间苯三酚的 Houben-Hoesch 反应,一锅顺序硼化,芳基溴化物 33 与芳基碘化物 26 的 Suzuki-Miyaura 交叉偶联,以及用于苯并吡喃结构的碱介导的区域选择性克莱森重排。