Journal
CHEMCATCHEM
Volume 13, Issue 7, Pages 1730-1737Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.202002016
Keywords
2-pyridone; acylmethylation; carboxymethylation; rhodium; diazo compound
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Funding
- National Key Research and Development Program of China [2020YFC1200201]
- National Natural Science Foundation of China [21372258]
- Renmin University of China
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Chelation-assisted C6-selective acylmethylation and carboxymethylation of 2-pyridones with diazo carbonyl compounds under [Cp*RhCl2](2)/AgSbF6 catalysis have been developed with excellent regioselectivity, high efficiency, broad substrate scope, wide functional group compatibility and gram-scalability. Preliminary mechanistic experiments are conducted to gain insights into the reaction mechanisms.
Chelation-assisted C6-selective acylmethylation and carboxymethylation of 2-pyridones with diazo carbonyl compounds under [Cp*RhCl2](2)/AgSbF6 catalysis have been developed. Deesterificative C6-acylmethylation of 2-pyridones with diazo tert-butyl ester compounds proceeds effectively with the use of HOAc additive and hexafluoroisopropanol (HFIP) solvent, whereas switching to NaOAc additive and MeOH solvent enables efficient deacylative C6-carboxymethylation of 2-pyridones with alkyl 2-diazo-3-oxobutanoates. The procedures are characterized by excellent regioselectivity, high efficiency, broad substrate scope, wide functional group compatibility and gram-scalability. Preliminary mechanistic experiments are conducted to gain insights into the reaction mechanisms.
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