Department of Drug and Natural Product Synthesis, Faculty of Life Sciences, University of Vienna, Vienna, Austria.
Molecules. 2010 Sep 1;15(9):6106-26. doi: 10.3390/molecules15096106.
The synthesis of the title compounds is described. Reaction of 1-substituted 2-pyrazolin-5-ones with 5-chloro-1-phenyl-1H-pyrazole-4-carbonyl chloride or 5-chloro-3-methyl-1-phenyl-1H-pyrazole-4-carbonyl chloride, respectively, using calcium hydroxide in refluxing 1,4-dioxane gave the corresponding 4-heteroaroylpyrazol-5-ols, which were cyclized into 1H-pyrano[2,3-c:6,5-c]dipyrazol-4(7H)-ones by treatment with K2CO3/DMF. The latter were converted into the corresponding thiones upon reaction with Lawesson's reagent. Detailed NMR spectroscopic investigations (1H, 13C, 15N) of the ring systems and their precursors are presented.
标题化合物的合成立方体描述。反应 1-取代 2-吡唑啉-5-酮与 5-氯-1-苯基-1H-吡唑-4-羰基氯或 5-氯-3-甲基-1-苯基-1H-吡唑-4-羰基氯,分别使用氢氧化钙在回流的 1,4-二恶烷中得到相应的 4-杂芳基吡唑-5-醇,其通过用 K2CO3/DMF 环化成 1H-吡喃[2,3-c:6,5-c]二吡唑-4(7H)-酮。后者与劳森试剂反应后转化为相应的硫酮。提出了对环系及其前体的详细 NMR 光谱研究(1H、13C、15N)。