A Simple and Efficient Synthesis of 2,3-Diarylnaphthofurans Using Sequential Hydroarylation/Heck Oxyarylation
摘要:
An efficient and simple strategy has been developed for the synthesis of 2,3-diarylnaphthofurans using sequential hydroarylation of naphthols and alkynes in the presence of In(OTf)(3) under microwave irradiation followed by one-pot Heck-oxyarylation of generated 1-substituted-alpha-hydroxy styrenes.
A metal-free, one-pot, iodine-mediated, microwave-assisted cyclization of 1-(1-arylvinyl)-2-naphthols (ortho-vinylnaphthols) into 1-arylnaphthofurans is developed. The 1-arylnaphthofurans are isolated in good to excellent yields (65-90%) using two equivalents of iodine in acetonitrile. The reactions proceed via the formation of 1-(2-iodo-1-phenylvinyl)naphthalen-2-ols as intermediates. Overall, the protocol is convenient as the reactions occur smoothly without the requirement of a transition-metal catalyst.