Dianions of alkanesulfonamides add to nitriles, and the resultant imine dianions are cyclized with a carbonyl equivalent to afford the known 2H-1,2,4-thiadiazin-3-(4H)-one 1,1-dioxide ring system. The use of aldehydes as electrophiles provides the novel 5,6-dihydro-1,4,3-oxathiazin-2(3H)-one 4,4-dioxide ring system.
烷磺酰胺的二元离子与腈相加,生成的
亚胺二元离子与羰基等价物环化,得到已知的 2H-1,2,4-噻二嗪-3-(4H)-酮 1,1-二氧化物环系统。使用醛作为亲电体,可得到新颖的 5,6-二氢-1,4,3-噁
噻嗪-2(3H)-酮 4,4-二氧化物环系统。