Synthesis of a New Spiro System: 1-Oxa-7-thia-4-azaspiro[4.5]decane 7,7-Dioxide

详细

Dihydro-2H-1λ⁶-thiopyran-1,1,3(4H)-trione reacted with N-substituted 2-aminoethanols to give derivatives of a new spiro system, 1-oxa-7λ⁶-thia-4-azaspiro[4.5]decane-7,7-diones. No spirocyclic product was obtained by the reaction with unsubstituted 2-aminoethanol, but the corresponding enamine was formed as in the reactions with other primary amines.