Journal
ACS CATALYSIS
Volume 11, Issue 3, Pages 1570-1577Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.0c05156
Keywords
palladium catalysis; carbene bridging C-H bond functionalization; pyridotriazole; pyridoisoquinolinone; berberine alkaloids
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Funding
- NSFC [21871259, 21901244]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB20000000]
- Open Research Fund of Key Laboratory of the Ministry of Education for Advanced Catalysis Materials
- Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Zhejiang Normal University
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The study presents a novel method for the synthesis of pyridoisoquinolinone derivatives using pyridotriazoles and o-bromo/pseudohalo benzaldehydes. This method is efficient and provides a rapid route to prepare protoberberine-type alkaloids. The pyridotriazole plays a dual role in promoting C-H bond functionalization and constructing the polycyclic system through pyridine dearomatization.
Compounds with a pyridoisoquinolinone core often appear as members of the protoberberine alkaloid family. Traditional methods to construct this framework normally rely on manipulation of sophisticated reactants. Herein, a palladium-catalyzed reaction of readily available pyridotriazoles and o-bromo/pseudohalo benzaldehydes is described, which provides a modular approach to pyridoisoquinolinone derivatives. This methodology provides a concise synthetic route to prepare protoberberine-type alkaloids. The role of pyridotriazole is 2-fold, acting as a relay reagent to promote C-H bond functionalization and undergoing pyridine dearomatization to construct the polycyclic system.
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