合成 DE CEPHEMES PAR 反应 DE NOUVELLES 6H-1,3-噻嗪 AVEC LES CETENES
摘要:
摘要 La 新制剂 6H-1,3-噻嗪在 2 位 un groupement benzoyle ou ethoxycarbonyle est decrite。Ces 组成 reagissent avec les acides precurseurs de cetenes en present de chlomre de mesyle et de triethylamine, ou avec les cetenes eux měmes pour conduire aux cephemes 通讯员 dans des conditions douces avec de bons rendements。描述了在 2 位带有苯甲酰基或乙氧基羰基的新型 6H-1,3-噻嗪的合成。这些化合物在甲磺酰氯和三乙胺的存在下与乙烯酮的酸前体反应,或与乙烯酮本身反应,在温和条件下以良好的产率产生头孢烯。
Addition reactions of heterocyclic compounds. Part 74. Products from dimethyl acetylenedicarboxylate with thiourea, thioamide, and guanidine derivatives
作者:R. Morrin Acheson、John D. Wallis
DOI:10.1039/p19810000415
日期:——
in acetonitrile gave a fused thiazolidinone derivative, but in methanol a fused thiazinone was obtained. Structures were assigned to adducts from other thioureas by comparison with the 13C n.m.r. spectra for these compounds. A method has been developed for distinguishing between the possible structural types of adducts for guanidine and amidine derivatives with DMAD using 1H and 13C n.m.r. spectroscopy
将苯并咪唑-2-硫酮与乙炔二甲酸二甲酯(DMAD)在乙腈中混合,得到稠合的噻唑烷酮衍生物,但在甲醇中,得到了稠合的噻嗪酮。通过与这些化合物的13 C nmr光谱比较,将结构分配给其他硫脲的加合物。已开发出一种使用1 H和13 C nmr光谱技术来区分DMAD与胍和am衍生物的加合物可能的结构类型的方法。从各种硫代酰胺和DMAD的产物通过其核磁共振谱和其他光谱进行鉴定。
Synthesis of 3,5-bis(acyl)-1,2,4-thiadiazoles via iodine mediated oxidative dimerization of α-oxothioamides
作者:Rajaghatta N. Suresh、Toreshettahally R. Swaroop、Veeresha Gowda Shalini、Kempegowda Mantelingu、Kanchugarakoppal S. Rangappa
DOI:10.1016/j.tetlet.2022.154302
日期:2023.2
A novel and an efficient method for the synthesis of 3,5-bis(acyl)-1,2,4-thiadiazoles by the oxidative cyclization of α-oxothioamides with assistance of moleculariodine has been reported. The required substrates – α-oxothioamides have been synthesized by the reaction of α-oxodithioesters with ammonium chloride and sodium acetate. The probable mechanism for the formation of products has presented.