Affiliation:
1. School of Petrochemical Engineering Jiangsu Key Laboratory of Advanced Catalytic Materials & Technology Changzhou University 213164 Changzhou P. R. China
2. School of Chemistry and Chemical Engineering Jiangsu University of Technology 213001 Changzhou P. R. China
Abstract
AbstractA visible‐light‐promoted O−H functionalization of 4‐hydroxycoumarins with α‐diazo esters was developed for the synthesis of 4‐hydroxycoumarin ethers under photocatalyst‐free conditions. Moreover, the three‐component reaction of 4‐hydroxycoumarins, α‐diazo esters and THF formed a series of 4‐hydroxycoumarin ether derivatives with alkoxyl spacers in yields up to 91%. The above mentioned solvent‐dependent carbene insertion transformations were conducted under extremely mild conditions with the tolerance of moisture and oxygen.
Funder
National Natural Science Foundation of China
Government of Jiangsu Province