N-Metallated azomethine ylides 5 were generated by the reaction of arylidene glycine imines 1 with AgOAc and triethylamine. These azomethine ylides undergo cycloaddition to chiral acrylamides 2 with excellent diastereoselectivity. The configuration of two of the cycloadducts (3a(1) and 3c(1)) has been confirmed by Xray crystallography.
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Nyerges et al. (2003) studied this question.