Synthesis and Transformations of 5-Substituted 2-Aryl-7H-[1,2,4]triazolo[3,2-b][1,3]thiazin-7-ones and 2-Aryl-2,3-dihydro-4H-[1,3]thiazino[3,2-a]benzimidazol-4-ones
作者:V. N. Britsun、A. N. Esipenko、A. N. Chernega、M. O. Lozinskii
DOI:10.1007/s11178-005-0130-1
日期:2005.1
3-Aryl-1,2,4-triazole-5-thiones react with dimethyl acetylenedicarboxylate and methyl 3-phenyl-propynoate to afford the corresponding 5-substituted 2-aryl-7H-[1,2,4]triazolo[3,2-b][1,3]thiazin-7-ones. Treatment of 2-aryl-2,3-dihydro-4H-[1,3]thiazino[3,2-a]benzimidazol-4-ones with alkalies leads to formation of 3-(benzimidazol-2-ylsulfanyl)-3-arylpropionic acids, their reaction with methyl p-toluenesulfonate yields 1-(3-methyl-2-thioxo-2,3-dihydro-1N-benzimidazol-1-yl)-3-phenyl-2-propen-1-one, and oxidation with hydrogen peroxide gives benzimidazole-2-sulfonic acid and 3-aryl-2-propenoic acids.
3-芳基-1,2,4-三唑-5-硫酮与乙炔二甲酸二甲酯和 3-苯基-丙炔酸甲酯反应,生成相应的 5-取代 2-芳基-7H-[1,2,4]三唑并[3,2-b][1,3]噻嗪-7-酮。用碱处理 2-芳基-2,3-二氢-4H-[1,3]噻嗪并[3,2-a]苯并咪唑-4-酮可生成 3-(苯并咪唑-2-基硫基)-3-芳基丙酸、与对甲苯磺酸甲酯反应生成 1-(3-甲基-2-硫酮-2,3-二氢-1N-苯并咪唑-1-基)-3-苯基-2-丙烯-1-酮,与过氧化氢氧化生成苯并咪唑-2-磺酸和 3-芳基-2-丙烯酸。