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The recent advances of [3 + 2] annulation in natural product synthesis. (A) The preparation of meloscine (158) features a cascade radical annulation of divinylcyclopropane [70]. (B) Thiyl-radical-mediated [3 + 2] annulation reaction realizes the synthesis of (−)-pavidolide B (166) [71–72]. (C) A Danheiser’s [3 + 2] annulation en route to conidiogenone B (171) [73] (inset, the suggested mechanism based on Danheiser’s proposal disclosed in 1981 [74].)
