Regular paperDesigning a catalytic synthesis of 4-methylcoumarin from ortho-iodophenyl 3-butenoate: Ring closure and isomerization control
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Add time:08/21/2019 Source:sciencedirect.com
The palladium-catalyzed ring closure of ortho0iodophenyl 3-butenoate to 4-methylcoumarin is in competition with the isomerization to the 2-butenoic ester; the latter reaction has been controlled by the appropriate use of ligands, solvents and neutralizing agents to the point that quantitative yields of the cyclic compound have been attained.
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