Synthesis of polycyclic spiro-fused indolines via IBX-mediated cascade cyclization
a Henan Key Laboratory of Organic Functional Molecule and Drug Innovation, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang 453007, China
b Quality and Technique Supervision, Inspection and Testing Center of Xuchang City, Xuchang 461000, China
c The College of Chemistry and Chemical Engineering, Shangqiu Normal University, Shangqiu 476000, China
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