New synthetic access to 3-fluoroalkyl-5-pyrazolecarboxylates and carboxylic acids

Add time:07/14/2019    Source:sciencedirect.com

A novel process for preparing 3-fluoroalkyl-5-pyrazolecarboxylates and carboxylic acids is hereby presented. Easily accesible α-fluorinated ketimines were condensed with oxalyl monochloride derivatives, and the obtained vinamides underwent acid-catalyzed cyclization with substituted hydrazines. This highly efficient protocol can also be used for non-fluorinated C-3 and C-5 substituents.

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