A General One-Pot Protocol for Hindered N -Alkyl Azaheterocycles from Tertiary Carboxylic Acids.

In this letter, we report a general one-pot strategy that utilizes three elementary steps (decarboxylative hydrazination, Boc deprotection, and heterocycle condensation) to regioselectively prepare hindered C(sp(3)) substituted pyrazoles and triazoles. The operational simplicity of this sequence and ubiquity of tertiary carboxylic acids allow rapid access to hindered N-alkyl azaheterocycles that will be useful to practitioners of medicinal chemistry and agro-chemistry.