Abstract

A new preparation of 3-pyrrolines is described by [3+2] cycloadditions of N-metalated azomethine ylides derived from α-amino esters with a dimethyl 7-oxabicyclo[2.2.1]hepta-2,5-diene-2,3-dicarboxylate derivative, followed by retro-Diels-Alder reactions. This two-step sequence appears superior to the direct reaction of ylides with dimethyl acetylenedicarboxylate and should be applicable to solid-phase synthesis.

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