Acylation of o-Imidoylphenol Lithium Dianions: Synthesis of 4H-Chromen-4-ylidenamines

A method is described to obtain 4H-chromen-4-ylidenamines 4, through the reaction of o-imidoyl phenol dianions 2′ with aromatic esters and subsequent acid cyclisation of the 3-(2-hydroxyphenyl)-3-(amino)-1-phenylprop-2-en-1-ones 3 obtained.