Isolation of Methyl (RS)-1-tert-Butoxycarbonyl-3-cyanomethyl-1,2-dihydro-2-oxo-5H-pyrrole-5- carboxylate, the Key-Intermediate in Base-Catalyzed Formation of Racemic Products by 1,3-Dipolar Cycloadditions to Methyl (S)-1-tert-Butoxycarbonyl-3- [(E)-cyanomethylidene]-2-pyrrolidinone-5-carboxylate.

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