Facile synthesis of diarylmethanes via quinone methides
摘要:
A novel acid-mediated generation of quinone methides followed by nucleophilic addition of electron-rich aromatic compounds to furnish diarylmethanes has been developed. A wide range of electron-rich aromatic compounds including some heterocycles can be employed for this reaction to provide the corresponding diarylmethanes in good yields and regioselectivities. (C) 2012 Elsevier Ltd. All rights reserved.
2-Arylchromans were readily prepared from the hetero-Diels−Alder reactions of styrenes with the ortho-quinonemethides (o-QMs) which, in turn, were generated by treating the MOM-protected benzylacetate derivatives with p-TsOH immobilized on silica (PTS-Si) in toluene under mild conditions (0 °C to rt). The corresponding chromans were obtained in moderate to excellent yields (42−97%) and in moderate