Reported here is the direct synthesis of naphthofurans and benzofurans from readily available phenols and α-haloketones promoted by titanium tetrachloride which combines Friedel–Crafts-like alkylation and intramolecular cyclodehydration into one step. This simple protocol allows for the formation of a variety of high value naphthofurans and benzofurans within which a series of cyclic and acyclic groups
Reaction of O-arylhydroxylamine hydrochlorides with either cyclic or acyclic ketones in the presence of methanesulfonic acid leads directly to the benzofuran derivative via a proposed one-pot condensation-rearrangement-cyclisation reaction sequence in good to excellent yields.
Nucleophilic Aromatic Substitution on Tricarbonylchromium-complexed Haloarenes: Synthesis of<i>O</i>-Aryloximes and Their Cyclization to Benzofurans
作者:Andreina Alemagna、Clara Baldoli、Paola Del Buttero、Emanuela Licandro、Stefano Maiorana
DOI:10.1055/s-1987-27888
日期:——
A series of O-aryloximes have been prepared from tricarbonylchromium-complexed haloarenes in mild conditions. Title compounds are starting materials for benzofuran synthesis.