一些新的3,5-二芳基-1 H-吡唑是由芳基甲基酮经克莱森与芳香族酯缩合制备的,然后与一水合肼环化。通过IR,1 H NMR光谱,质谱和元素分析确认了它们的结构。给出了3(5)-(4-叔丁基苯基)-5(3)-(4-甲氧基苯基)-1H-吡唑(2b)的X射线结构。结果表明,化合物2b以互变异构体I和II存在,其分子通过N–H··N分子间氢键连接,形成由互变异构体I和II组成的环状二聚体。
Efficient synthesis of celecoxib and pyrazole derivatives on heterogeneous Ga-MCM-41-SO3H catalyst under mild condition
作者:Tran Quang-Hung、Tu T. Do、Viet Q. Hoang、Duc M. Tran、Ngo Quoc-Anh、Tuan-Anh L. Hoang、Reinhard Eckelt、Dang V. Do、Tuan T. Dang、Xuan-Hoan Vu
DOI:10.1007/s11696-022-02452-1
日期:2023.1
The application of Ga-MCM-41-SO3H as a new efficient heterogeneous catalyst for the synthesis of celecoxib and pyrazolederivatives under room temperature is reported. The mesoporous material Ga-MCM-41 was first prepared and then functionalized with the sulfonic acid group by the post-synthetic modification to obtain the final solid acid catalyst. The successful grafting of the -SO3H group onto the
报道了Ga-MCM-41-SO 3 H作为新型高效多相催化剂在室温下合成塞来昔布和吡唑衍生物的应用。首先制备介孔材料Ga-MCM-41,然后通过合成后改性将磺酸基团官能化,得到最终的固体酸催化剂。通过 X 射线衍射、配备能量色散光谱 (SEM/EDS) 的扫描电子显微镜和酸碱滴定法,证实了 -SO 3 H 基团成功接枝到 Ga-MCM-41 介孔壁上。Ga-MCM-41-SO 3 H在合成塞来昔布和吡唑衍生物中的催化应用在温和条件下产生了高产率(高达95%)。值得注意的是,Ga-MCM-41-SO3 H催化剂很稳定,可以重复使用至少五次而不会失去显着的催化活性。 图形概要
Preparation and structures of some new 1H-pyrazole derivatives
Some new 3,5-diaryl-1H-pyrazoles were prepared from aryl methyl ketones via Claisen condensation with aromatic esters and followed by cyclization with hydrazine monohydrate. Their structures were confirmed by IR, 1H NMR spectroscopy, mass spectrometry and elemental analysis. The X-ray structure for 3(5)-(4-tert-butylphenyl)-5(3)-(4-methoxyphenyl)-1H-pyrazole (2b) was presented. The results show that
一些新的3,5-二芳基-1 H-吡唑是由芳基甲基酮经克莱森与芳香族酯缩合制备的,然后与一水合肼环化。通过IR,1 H NMR光谱,质谱和元素分析确认了它们的结构。给出了3(5)-(4-叔丁基苯基)-5(3)-(4-甲氧基苯基)-1H-吡唑(2b)的X射线结构。结果表明,化合物2b以互变异构体I和II存在,其分子通过N–H··N分子间氢键连接,形成由互变异构体I和II组成的环状二聚体。