名称:
Thermal decomposition of 2H-(1,2,4)oxadiazolo(2,3-a)pyridine-2-thione and 2H-(1,2,4)oxadiazolo(2,3-b)pyridazine-2-thiones: Generation of aza-heteroaromatic .ALPHA.-isocyanates and their utilization for the synthesis of unsymmetrical disubstituted ureas.
摘要:
2H-[1, 2, 4]噁二唑[2, 3-a]吡啶-2-硫酮的热分解生成了3-(2-吡啶基)-2H-吡啶[1, 2-a]-1, 3, 5-三嗪-2, 4(3H)-二酮和1, 3-二(2-吡啶基)脲,而其吡唑类似物的类似分解则生成了3-(3-吡唑基)-2H-吡唑[1, 6-a]-1, 3, 5-三嗪-2, 4(3H)-二酮和1, 3-二(3-吡唑基)脲。在分解过程中产生的氮杂杂环α-异氰酸酯被用于合成不对称的1, 3-二取代脲。