Abstract:
The polycyclic oxygen-containing spiro-heterocycles 6-oxa-2,9-diazadispiro[4.1.4.1]dodeca-1,8-diene-4,11-dione 2,9-dioxide and 3,3a,6,6a-tetrahydrospiro(furo[2,3-c]pyrrole-2,3’-pyrrol)-4’(5’H)-one 1’,5-dioxide were formed in the reactions of 2,4-dihydro-3H-pyrrol-3-one 1-oxide with benzaldehyde.