Towards a General Access to 1‐Azaspirocyclic Systems via Photoinduced, Reductive Decarboxylative Radical Cyclizations
作者:Natalia Kiprova、Marine Desnoyers、Rok Narobe、Arthur Klufts‐Edel、Juliane Chaud、Burkhard König、Philippe Compain、Nicolas Kern
DOI:10.1002/chem.202303841
日期:2024.3
construction of important 1-azaspirocyclic scaffolds is described. Alkynyl-tethered N-hydroxyphthalimide esters, swiftly assembled through an alkylation/deprotection/activation sequence, undergo photoinduced reductive decarboxylative radical 5-exo and 6-exo-dig cyclizations employing eosin Y (EY) as inexpensive photocatalyst. The key step can proceed in a diastereoconvergent manner and affords diverse ring
描述了一种用于构建重要的 1-氮杂螺环支架的简单但通用的策略。炔基连接的N-羟基邻苯二甲酰亚胺酯通过烷基化/脱保护/活化序列快速组装,使用曙红 Y (EY) 作为廉价光催化剂进行光诱导还原脱羧自由基 5- exo和 6- exo -dig 环化。关键步骤可以以非对映收敛方式进行,并提供与药物化学和天然产物相关的多种环系统。