Synthesis and structural studies of a new class of heterocyclic compounds: 1,2,4-Pyridothiadiazine 1,1-dioxides, pyridyl analogues of 1,2,4-benzothiadiazine 1,1-dioxides
作者:Pascal de Tullio、Bernard Pirotte、Léon Dupont、Bernard Masereel、Didier Laeckmann、Tchao Podona、Ousmane Diouf、Philippe Lebrun、Jacques Delarge
DOI:10.1016/0040-4020(95)00060-l
日期:1995.3
A series of novel 1,2,4-pyridothiadiazine 1,1-dioxides (1), some of them being pyridyl analogues of the 1,2,4-benzothiadiazine 1,1-dioxide diazoxide (2), were synthesized and selected physicochemical data (pKa, log P′) were collected. By means of spectral (13C NMR, UV) and X-ray data, the most favourable position of the C=N double bond in the thiadiazine ring was discussed. It was concluded that like
一系列新颖的1,2,4- pyridothiadiazine 1,1-二氧化物的(1),1,2,4-苯并噻二嗪1,1-二氧化物二氮嗪它们中的一些是吡啶基类似物(2) ,合成和选择的物理化学收集数据(pK a,log P')。通过光谱(13 C NMR,UV)和X射线数据,讨论了噻二嗪环中C = N双键的最佳位置。结论是,与1,2,4-苯并噻二嗪1,1-二氧化物一样,1,2,4-吡啶并噻二嗪1,1-二氧化物在2-和4-位上没有烷基取代基,无论氮原子位置如何吡啶环显示出主要的互变异构体4H-形式。