Novel cyclic sulfilimines (so-called azathiabenzenes), 2-methyl-1-aza-2-thianaphthalene (7) and 9-methyl-(14a) or 9-ethyl-10-aza-9-thiaphenanthrene (14b), were synthesized in high yields by deprotonation of the corresponding azasulfonium salts (6, 13a, 13b) with base. The ylidic properties of the azathiabenzenes were revealed by spectral and chemical evidence. The azathiabenzenes (14a, 14b) were easily oxidized with potassium permanganate to yield the corresponding azathiabenzene oxides (18a, 18b). Thermolysis of 14a in refluxing xylene afforded the ring-expanded product 7H-dibenzo [d, e] [1, 3] thiazepine (21), while 14b underwent β-elimination on refluxing in xylene to give 6H-dibenzo [c, e] [1, 2] thiazine (24). Reactions of the azathiabenzene derivatives with dimethyl acetylenedicarboxylate as an electrophile are also reported.
通过用碱对相应的偶氮锍盐(6、13a、13b)进行去质子化,高产率地合成了新型环状亚磺
酰亚胺(即
偶氮苯)、2-甲基-1-氮杂-2-
噻吩萘(7)和 9-甲基-(14a)或 9-乙基-10-氮杂-9-
噻吩蒽(14b)。光谱和
化学证据揭示了氮杂
二苯乙烯的酰基性质。
硫氮苯(14a、14b)很容易被
高锰酸钾氧化,生成相应的
硫氮苯氧化物(18a、18b)。14a 在回流二
甲苯中发生热分解,得到环状扩展产物 7H-二苯并[d, e] [1, 3]
硫氮杂卓(21),而 14b 在二
甲苯中回流发生 β-消除反应,得到 6H-二苯并[c, e] [1, 2]
硫氮杂卓(24)。此外,还报道了以
乙炔二
甲酸二甲酯为亲电体的氮杂
环丁烷苯衍
生物的反应。