作者:J. Lamotte、K. Dupont、O. Dideberg、G. Dive、J. C. Jamoulle
DOI:10.1107/s0567740880008217
日期:1980.9.1
Fused-Ring Thiadiazines: Preparation and Crystallographic Characterization of 3-Phenyl Derivative of Benzo-, Pyridio[2,3-<i>e</i>]-, Pyrazino[2,3-<i>e</i>]-, and Tetrafluorobenzo-[1,2,4]thiadiazines
作者:Józef Zienkiewicz、Piotr Kaszynski、Victor G. Young
DOI:10.1021/jo035835h
日期:2004.4.1
favorable by about 2 kcal/mol than in the analogous sulfoxide. Crystal and molecularstructures of three out of the four thiadiazines were established by single-crystal X-ray analysis. All thiadiazines were found as the 4H tautomers with the heterocyclic ring puckered along the S(1)···N(4) line. The benzo derivative 1a forms a unidimensional N(4)−H···N(2) chain, the pyrazino derivative 1c forms dimeric
从相应的am 2分两步制备了四个双环4 H- [1,2,4]噻二嗪1a - d,产率为74-88%。通过从中间体S-丙基亚硫亚胺12中热消除丙烯获得了它们中的三个,即1a,1b和1d。吡嗪衍生物1c是由2c得到的亚砜14c热分解而形成的。电子我使用DFT方法研究了其机理。在亚硫亚胺中的消除似乎比在类似亚砜中的消除更有利于约2kcal / mol。通过单晶X射线分析建立了四种噻二嗪中的三种的晶体和分子结构。发现所有噻二嗪为4H互变异构体,杂环沿S(1)··N(4)线折叠。苯并衍生物1a形成一维N(4)-H··N(2)链,吡嗪并衍生物1c形成具有两个协同氢键的二聚体对,并且1d的晶体结构具有强C 6 F 4 ·的特征。 ··C 6 H 5四极相互作用。