Asymmetric Synthesis of Lysergic Acid via an Intramolecular (3+2) Dipolar Cycloaddition/Ring-Expansion Sequence
作者:Upendra Rathnayake、Philip Garner
DOI:10.1021/acs.orglett.1c02337
日期:2021.9.3
scalable asymmetric synthesis of lysergic acid, a core component of the ergot alkaloid family, is reported. The synthesis features the strategic combination of an intramolecular azomethine ylide cycloaddition and Cossy–Charette ring expansion to assemble the target’s C- and D-rings. Simple functional group manipulation produced a compound that had been converted to lysergic acid in four steps, thus
据报道,麦角生物碱家族的核心成分麦角酸的一种有效的、潜在可扩展的不对称合成方法。该合成具有分子内偶氮甲碱叶立德环加成和 Cossy-Charette 环扩展的战略组合,以组装目标的 C 环和 D 环。简单的官能团操作产生了一种化合物,该化合物在四个步骤中转化为麦角酸,从而构成了天然产物的正式合成。该策略可用于制备包括非天然对映体的新型麦角类似物,并且相对于先前的方法可能更易于产生类似物。