Phenol → Salicylaldehyde

Participants

Reaction Steps

A mixture of an appropriate phenol and hexamethylene-tetramine are treated with an appropriate acid, such as trifluoroacetic acid, to provide upon aqueous workup the corresponding o-formylphenol. This o-formylphenol is then treated with (bromomethyl)triphenylphosphonium bromide followed by an appropriate base such as potassium tert-butoxide to provide the desired benzofuran.

Provenance & Evidence