Natural product electrosynthesis: An eco-friendly protocol for the synthesis of protoberberine and 13-Me protoberberinealkaloids relies on electrochemical acceptorless dehydrogenation at the last stage, using 10 mol% I2 as redox mediator at room temperature under mild reaction conditions.
天然产物电合成:用于合成原小檗碱和 13-Me 原小檗碱生物碱的环保方案依赖于最后阶段的电化学无受体脱氢,在温和的反应条件下在室温下使用 10 mol% I 2 作为氧化还原介质。
Total Synthesis of (−)-Canadine, (−)-Rotundine, (−)-Sinactine, and (−)-Xylopinine Using a Last-Step Enantioselective Ir-Catalyzed Hydrogenation
we achieved an efficient and sustainable synthesis of secondary amine hydrochlorides via a fully continuous flow; in the second step, we developed a Pictet–Spengler reaction/Friedel–Crafts hydroxyalkylation/dehydration cascade for the construction of the dihydroprotoberberine core structure (ABCD-ring); and in the last step, Ir-catalyzed enantioselective hydrogenation was employed for the introduction
The concise syntheses of eight 13-methylprotoberberine (13-MePB) and eight enantioenriched 13-methyltetrahydroprotoberberine (13-MeTHPB) alkaloids have been achieved in a tactically modular fashion. This synthetic work features a one-pot metal-free Pictet-Spengler/Friedel-Crafts hydroxyalkylation/dehydration/oxidation sequence and a following highly enantioselective Ir-catalyzed hydrogenation. Given