Thiadiazole ring opening in the derivatives of 2-substituted 5-(1,2,3-thiadiazol-4-yl)-3-furoic acid under the action of bases
作者:R. Maadadi、L. M. Pevzner、M. L. Petrov
DOI:10.1134/s1070363217020177
日期:2017.2
of potassium tert-butylate in THF, the studied compounds decompose with the cleavage of the thiadiazole ring, liberation of nitrogen, and formation of labile acetylene thiolates. In the presence of methyl iodide, these salts form stable 2-methylthioethynylfurans. Under the action of sodium ethylate in ethanol, thiadiazole ring of ethyl [2-methyl-5-(1,2,3-thiadiazol-4-yl)]-3-furoate is split to form the
研究了2-取代的5-(1,2,3-噻二唑-4-基)-3-糠酸在碱的作用下的转化。在钾叔存在下丁酸酯在THF中的分解,随着噻二唑环的断裂,氮的释放以及不稳定的乙炔硫醇盐的形成而分解。在甲基碘存在下,这些盐形成稳定的2-甲基硫代乙炔基呋喃。在乙醇中乙醇酸钠的作用下,[2-甲基-5-(1,2,3-噻二唑-4-基)]-3-糠酸乙酯的噻二唑环分裂形成相应的乙炔硫醇钠。在乙醇的作用下,该盐的两个分子产生双(呋喃基)二硫富富烯。在DMF-碳酸钾体系中,乙炔硫醇盐与伯胺和仲胺反应,生成(4-乙氧基羰基-5-甲基糠-2-基)乙酸的硫代酰胺。2-甲基和2- N乙基的处理-吗啉代甲基-5-(1,2,3-噻二唑-4-基)-3-糠酸酯与水合肼导致酯基的肼解反应和噻二唑环的裂解导致4-肼基羰基呋喃-2-肼的酰肼形成乙酸。在2-乙酰氧基甲基-乙基和2-(4-硝基苯氧基)甲基-5-(1,2,3-噻二唑-4-基)-3-糠酸