Abstract

1,3-Dipolar cycloaddition of ethyl N-(ethoxycarbonylmethyl)benzimidate (1) with N-aryl maleimides (2) gave a pair of pyrrolo[3,4- c]pyrrole isomers (3, 4) and a 7-azabicyclo[2.2.1]heptane derivative (5). The configuration of isomers 3 and 4 was confirmed by 1H-NMR.

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