Hg(OAc)2·0.1Sc(OTf)3-Catalyzed
Cycloisomerization of
2-(4-Pentynyl)furan
Posted on 2007-03-29 - 00:00
Although the Hg(OTf)2·3TMU-catalyzed Friedel−Crafts-type reaction of 3-(4-pentynyl)furan afforded the exo cyclization product, the reaction of
2-(4-pentynyl)furan furnished a very low yield. We found a 10:1 mixed reagent of Hg(OAc)2 and Sc(OTf)3 showed remarkable catalytic activity
for the latter transformation. The actual reacting species is presumed to be Hg(OAc)(OTf), which is efficiently generated in situ by mixing the
two reagents.