Abstract
The addition of Yb(OTf)3 or Lu(OTf)3 was found to be quite effective in obtaining exo-selectivity (up to 87:13) in the reaction of 2-benzopyrylium-4-olate, which was generated by the Rh2(OAc)4-catalyzed decomposition of o-methoxycarbonyl-α-diazoacetophenone, with 3-acryloyl-2-oxazolizinone. The stereoselectivity of the rare earth metal triflate-catalyzed reaction was strongly influenced by the ionic radius of the rare earth metal element, a larger or smaller ionic radius than that of Lu3+ resulted in decreased exo-selectivity.
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