Glutarimide, 3, 5-morpholinedione, and 3, 5-thiomorpholinedione were converted to their respective dianions by means of slightly more than 2 mol equiv of sodium amide in liquid ammonia. Reactions of the dianions derived from glutarimide and 3, 5-morpholinedione with alkyl halides and carbonyl compounds afforded 01-substituted derivatives of the parent heterocycles. The dianion of 3, 5-thiomorpholinedione gave a similar monosubstituted ...
[Porter, Ned A.; Breyer, Robert; Swann, Elizabeth; Nally, James; Pradhan, Jyotsna; et al. Journal of the American Chemical Society, 1991 , vol. 113, # 18 p. 7002 - 7010]