Journal
JOURNAL OF ORGANIC CHEMISTRY
Volume 86, Issue 14, Pages 9771-9780Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.joc.1c01170
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Funding
- National Institute of Health (NIH) [2R01GM097082-05]
- European Lead Factory (IMI) [115489]
- Qatar National Research Foundation [NPRP6-065-3-012]
- ITN Accelerated Early stage drug dIScovery (AEGIS) [675555]
- COFUND ALERT [665250]
- Hartstichting (ESCAPE-HF) [2018B012]
- KWF Kankerbestrijding grant [10504]
- China Scholarship Council
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A Cu-catalyzed cascade reaction was successfully designed to access highly substituted isoquinolone-4-carboxylic acid using ammonia and 2-halobenzoic acids as crucial building blocks. Privileged polysubstituted isoquinolin-1(2H)-ones were constructed in a combinatorial format with generally moderate to good yields. The protocol showed broad substrate scope and good functional group tolerance, making it possible to access free 4-carboxy-isoquinolone using a convergent multicomponent reaction protocol for the first time.
Highly substituted isoquinolone-4-carboxylic acid is an important bioactive scaffold; however, it is challenging to access it in a general and short way. A Cu-catalyzed cascade reaction was successfully designed involving the Ugi postcyclization strategy by using ammonia and 2-halobenzoic acids as crucial building blocks. Privileged polysubstituted isoquinolin-1(2H)-ones were constructed in a combinatorial format with generally moderate to good yields. The protocol, with a ligand-free catalytic system, shows a broad substrate scope and good functional group tolerance toward excellent molecular diversity. Free 4-carboxy-isoquinolone is now for the first time generally accessible by a convergent multicomponent reaction protocol.
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