In the presence of a gold catalyst, the ring opening of 1,4-epoxy-1,4-dihydronaphthalenes with allyltrimethylsilane affords allylnaphthalenes in high yield. For unsymmetrical substrates, high regioselectivity is observed in many cases. This reaction might proceed via tricyclic tetrahydrofuran intermediates which are formed stereoselectively.
Lewis Acid-Catalyzed Ring-Opening Functionalizations of 1,4-Epoxy-1,4-dihydronaphthalenes
作者:Yoshinari Sawama、Yuta Ogata、Koichi Kawamoto、Hiroyuki Satake、Kyoshiro Shibata、Yasunari Monguchi、Hironao Sajiki、Yasuyuki Kita
DOI:10.1002/adsc.201200771
日期:2013.2.1
1-naphthol derivatives via unstable cation intermediates formed by the acid-catalyzed ring-opening reaction of the 1,4-epoxy moiety of 1,4-epoxy-1,4-dihydronaphthalenes, their nucleophilic functionalization using the cation intermediates as an active species is extremely difficult. We have accomplished the Lewisacid-catalyzed carbon-carbon and carbon-nitrogen bond formations associated with the ring-opening