A new construction of tricyclic compounds has been developed from a gold-catalyzed cycloisomerization of alkylidenecyclopropanes tethered by alkynes, giving the corresponding nitrogen- and oxygen-containing six-membered heterocyclic compounds in high yields under very mild conditions (see scheme; Ts=4-toluenesulfonyl, Ns=4-nitrobenzenesulfonyl, Bs=4-bromobenzenesulfonyl).
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Zhang et al. (2012) studied this question.
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