Syntheses of heterocyclic compounds. Part XII. Halogen-substituted 3-arylsydnones
Abstract
The reactivity of halogen in the benzene ring and also in the 4-position of the sydnone ring of various arylsydnones towards nucleophiles has been investigated. The course of ring-fission in 4-halogenosydnones induced by primary amines differs from that of secondary amines. The reaction in the latter case provides a preparative route to diamino-acid amides. Several new halogenosydnones are described.