Sulfur ylides 8. Synthesis of 5-methylthio-7,8-dihydro-4,8a-diazafluorene-6,9-dione

Article abstract of DOI:10.1007/BF02494303

Intramolecular cyclization of ketostabilized sulfur ylide obtained from β-alanine and 2,3-pyridinedicarboxylic anhydride was studied. The structure of the reaction product, 5-methylthio-7,8-dihydro-4,8a-diazafluorene-6,9-dione, was established by X-ray diffraction analysis.