We report herein a silver(I)-catalyzed exo-selective synthesis of highly substituted Delta1-pyrroline scaffolds from amino acid-derived münchnones. Silver acetate successfully catalyzed the cycloaddition reaction of azlactones with alkenes, generating Delta1-pyrrolines in very good yields without isomerization to the Delta2-pyrrolines or decarboxylation.
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Peddibhotla et al. (2004) studied this question.
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