The coupling of β-cyanocarbene complexes and 2-alkynylbenzoyl derivatives has been examined. The reaction afforded phenanthridine derivatives in a complex tandem process involving carbene-alkyne coupling, isobenzofuran formation, intramolecular Diels-Alder reaction using a nitrile dienophile, and deoxygenation. The chemistry could not be reproduced in non-chromium-based systems.
β-
氰基碳烯配合物与2-炔基苯甲酰衍
生物的耦合反应已被研究。该反应在一个复杂的串联过程中生成了
菲啰
喹啉衍
生物,涉及碳烯-
炔烃耦合、
异苯并呋喃的形成、使用腈类二烯亲电试剂的分子内Diels-Alder反应以及去氧化。该
化学反应在非
铬基体系中无法重现。