报道了一系列新型三取代吡唑衍生物的合成及其PIFA介导的向带有稠合吡唑并[4,3- c ]喹啉环系统的分子的转化。这些化合物的抗血管生成活性通过使用体外测定内皮细胞增殖和迁移的方法以及鸡绒膜尿囊膜(CAM)的方法进行评估。含有融合的吡唑并[4,3- c ]喹啉基序的化合物以有效的抗血管生成化合物出现,它们还具有在体外抑制人乳腺癌(MCF-7)和宫颈癌(Hela)细胞生长的能力。
PIFA-mediated synthesis of novel pyrazoloquinolin-4-ones as potential ligands for the estrogen receptor
作者:Michael S. Christodoulou、Konstantinos M. Kasiotis、Nikolas Fokialakis、Imanol Tellitu、Serkos A. Haroutounian
DOI:10.1016/j.tetlet.2008.09.098
日期:2008.12
efficient preparation of pyrazoloquinolin-4-ones, as potential ligands for the estrogen receptor, via a PIFA [phenyliodine(III)bis(trifluoroacetate)] promoted cyclization reaction with overall yields up to 29% over six steps is described. The employed strategy, based on an electrophilic amidation reaction as the key step of the synthesis, allows the generation of a diverse array of derivatives.
Non-Decarboxylative Ruthenium-Catalyzed Rearrangement of 4-Alkylidene-isoxazol-5-ones to Pyrazole- and Isoxazole-4-carboxylic Acids
作者:Camilla Loro、Letizia Molteni、Marta Papis、Leonardo Lo Presti、Francesca Foschi、Egle M. Beccalli、Gianluigi Broggini
DOI:10.1021/acs.orglett.2c01135
日期:2022.4.29
any additive, afforded pyrazole- and isoxazole-4-carboxylic acids, respectively. The presence of an intramolecular H-bond in these substrates was the key to divert the classical mechanism toward a ring-opening non-decarboxylative path that is expected to generate a vinyl Ru-nitrenoid intermediate, the cyclization of which affords the rearranged products. A gram scale protocol demonstrated the synthetic
在没有任何添加剂的情况下,用催化量的[RuCl 2 ( p-伞花烯)] 2处理4-(2-氢氨基亚烷基)-和4-(2-羟基亚烷基)-取代的异恶唑-5(4 H )-酮,得到吡唑-和异恶唑-4-羧酸,分别。这些底物中分子内氢键的存在是将经典机制转向开环非脱羧途径的关键,预计会产生乙烯基Ru-氮烯类中间体,其环化提供重排产物。克级方案证明了这种转化的综合适用性。