Upon irradiation N-formyl-N-methylcyclohexene-1-carboxamide (2a) cyclized to give N-methylcyclohexane-l,1-dicarboximide (3a) in a high yield. The reaction proceeds via intramolecular hydrogen abstraction. Similarly, several other alkyl-substituted azetidine-2,4-diones were synthesized.
照射后,N-甲酰基-N-甲基
环己烯-1-甲酰胺(2a)环化,以高产率得到N-
甲基环己烷-1,1-二甲
酰亚胺(3a)。该反应通过分子内夺氢进行。类似地,合成了几种其他烷基取代的氮杂
环丁烷-2,4-二酮。