Abstract
A series of new 3a',6a'-dihydro-2'H-spiro[indole-3,1'-pyrrolo[3,4-c]pyrrole]-2,4',6'(1H,3'H,5'H)- triones has been synthesized by cycloaddition of azomethine ylides, obtained from isatins and acyclic aliphatic and sulfur-containing α-amino acids, to maleimides. The direction of the cycloaddition was determined and the chemical properties of the obtained spiro products were examined.
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