An environmentally benign and efficient method has been developed for the synthesis of naphtho[2,1-b]furan from (E)-(2-nitrovinyl)benzene and naphthalen-2-ol in brine media under catalyst-free conditions through microwave-assisted technology. The advantages of this process are that it is catalyst-free, has an easy work-up, provides good yields, and uses brine as the solvent which is considered to be relatively environmentally benign.
DABCO‐Promoted Selective Photochemical C−N Coupling: Access to Unsymmetrical Azahelicenes
作者:R. Yu. Balakhonov、I. S. Mekeda、V. Z. Shirinian
DOI:10.1002/adsc.202300833
日期:2023.11.7
presence of electron acceptors, the reaction occurs by a radical pathway and with low chemoselectivity, while DABCO promotes intramolecularcyclization to give naphthofuroquinolines (NFQs) in 34–87% yields. The iminyl radical formed under UV irradiation in the presence of DABCO due to single electron transfer (SET) and N−O bond cleavage undergoes selective intramolecular homolytic aromatic substitution