Another pathway: A new type of Lewis acid promoted [3+3] cycloaddition of methylenecyclopropane-1,1-diesters with C,N-diarylnitrones is disclosed. This cycloaddition is highly site-, regio-, and stereoselective and proceeds in moderate-to-excellent yields. A three-component one-pot version of the cycloaddition is also reported.
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Hu et al. (2008) studied this question.
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