化学
光敏剂
催化作用
环加成
腈
光催化
反应性(心理学)
组合化学
光化学
能量转移
纳米技术
有机化学
材料科学
替代医学
病理
医学
分子物理学
作者
Yoshimi Kato,Tatsuhiko Yoshino,Min Gao,Jun-ya Hasegawa,Masahiro Kojima,Shigeki Matsunaga
摘要
Photosensitization of organometallics is a privileged strategy that enables challenging transformations in transition-metal catalysis. However, the usefulness of such photocatalyst-induced energy transfer has remained opaque in iron-catalyzed reactions despite the intriguing prospects of iron catalysis in synthetic chemistry. Herein, we demonstrate the use of iron/photosensitizer-cocatalyzed cycloaddition to synthesize polyarylpyridines and azafluoranthenes, which have been scarcely accessible using the established iron-catalyzed protocols. Mechanistic studies indicate that triplet energy transfer from the photocatalyst to a ferracyclic intermediate facilitates the thermally demanding nitrile insertion and accounts for the distinct reactivity of the hybrid system. This study thus provides the first demonstration of the role of photosensitization in overcoming the limitations of iron catalysis.
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