Cycloisomerization of Oxindole-Derived 1,5-Enynes: A Calcium(II)-Catalyzed One-Pot, Solvent-free Synthesis of Phenanthridinones, 3-(Cyclopentenylidene)indolin-2-ones and 3-Spirocyclic Indolin-2-ones
作者:Srinivasarao Yaragorla、Abhishek Pareek、Ravikrishna Dada
DOI:10.1002/adsc.201700569
日期:2017.9.4
Calcium‐catalyzed regioselective synthesis of oxindole‐derived 1,5‐enynes, followed by cycloisomerization, from readily accessible 3‐hydroxy‐3‐(alkynyl)indolin‐2‐ones and styrenes in one‐pot, under solvent‐free conditions is described. This method offers the synthesis of diverse molecules: phenanthridinones, 3‐(cyclopentenylidene)indolin‐2‐ones, and 3‐spirocyclic indolin‐2‐ones are obtained through
描述了在无溶剂条件下,从一锅中容易获得的3-羟基-3-(炔基)吲哚-2-酮和苯乙烯中钙催化的羟吲哚衍生的1,5-烯炔的区域选择性合成,然后进行环异构化。该方法可合成多种分子:菲啶酮,3-(环戊烯基)吲哚-2-酮和3-螺环吲哚-2-酮是通过包括交叉脱水偶联,[3,3]-σ在内的级联反应获得的重排,碳环化,异构化,氧化环重排和Diels-Alder环加成。此外,该方法具有原子经济和阶梯经济,底物范围广,产率高的特点。