A complimentary cat.: Copper(II) hexafluoroantimonate catalyzes the formal [3+3] cycloaddition of Lewis acid activated nitrones and vinyl diazoacetates to produce 3,6-dihydro-1,2-oxazines in yields of up to 96 % and diastereoselectivities greater than 25:1 (see scheme). This process compliments the metal carbene pathway that is catalyzed by rhodium(II) species.
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Qian et al. (2012) studied this question.
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