Rearrangement of Dypnones to 1,3,5-Triarylbenzenes
摘要:
Rearrangement of dypnones to 1,3,5-triarylbenzenes is described. The reaction is proposed to involve an aldol-type self-condensation of dypnones, followed by an intramolecular [2 + 2] cycloaddition and a retro-[2 + 2] cycloaddition. The reaction goes smoothly under obviously milder conditions in comparison to the cyclotrimerization of acetophenones to 1,3,5-triarylbenzenes (10 mol % of TsOH, 80 degrees C versus 130-148 degrees C). This unexpected rearrangement would provide new possible considerations in dypnone-involved organic synthesis.
合成并评价了新型3,3-螺萘烷化的5-芳基,6-芳基乙烯基取代的1,2,4-三恶烷19-34通过口服途径对瑞士小鼠多药耐药性约氏疟原虫的抗疟活性从96 mg / kg x 4天到24 mg / kg x 4天。该系列中活性最高的化合物(化合物25)在24 mg / kg x 4天时提供了100%的保护,其他1,2,4-三恶烷22、26、27和30也显示出良好的活性。在该模型中,β-蒿甲醚通过口服途径分别以48 mg / kg x 4天和24 mg / kg x 4天提供100%和20%的保护。化合物25的体外药代动力学特征与参考药物β-蒿醚的相似。活性结果证明在1,2,4-三恶烷药效团的C-5位上的芳基部分很重要。
Deoxygenativechlorination of carbonyl compounds using the HMe2SiCl/FeCl3/EtOAc and HMeSiCl2/FeCl3/EtOAc systems has been systemically investigated. The HMe2SiCl-FeCl3 system showed the advantages of good substrate applicability, mild reaction conditions, simple operation, low cost, and easy availability of raw materials. Also, it provided a simple and efficient synthesis route for carbonyl deoxychlorination
Sulfuric-acid-promoted tandem reaction of phenols with acetophenones under solvent- and metal-free conditions has been developed, which afforded functional 4H-chromenes in good yields with water as the side product.
β-Substituted α,β-unsaturated carbonyl compounds were obtained in moderate to high yields by a 1,4-addition of organocuprates to enol phosphate intermediates formed in situ from triethyl phosphite and 2-bromo-1,3-dicarbonyl compounds.
Abstract Air-stable zirconocene bis(perfluoroctanesulfonate)s [Cp2Zr]OSO2C8F17)2] (1) with high Lewis acidity and high thermal stability was prepared by the reaction between Cp2ZrCl2 and AgOSO2C8F17. The as-prepared complex 1 exhibits good activity and selectivity in the cyclotrimerization of various ketones to the desired 1,3,5-triaylbenzenes. Furthermore, in the cyclic experiments, the complex 1
Synthesis and Antimalarial Activity of 3,3-Spiroanellated 5,6-Disubstituted 1,2,4-Trioxanes
作者:Ranjani Maurya、Awakash Soni、Devireddy Anand、Makthala Ravi、Kanumuri S. R. Raju、Isha Taneja、Niraj K. Naikade、S. K. Puri、Wahajuddin、Sanjeev Kanojiya、Prem P. Yadav
DOI:10.1021/ml300188t
日期:2013.2.14
6-arylvinyl-substituted 1,2,4-trioxanes 19-34 have been synthesized and appraised for their antimalarial activity against multidrug-resistant Plasmodium yoelii nigeriensis in Swiss mice by oral route at doses ranging from 96 mg/kg x 4 days to 24 mg/kg x 4 days. The most active compound of the series (compound 25) provided 100% protection at 24 mg/kg x 4 days, and other 1,2,4-trioxanes 22, 26, 27, and 30
合成并评价了新型3,3-螺萘烷化的5-芳基,6-芳基乙烯基取代的1,2,4-三恶烷19-34通过口服途径对瑞士小鼠多药耐药性约氏疟原虫的抗疟活性从96 mg / kg x 4天到24 mg / kg x 4天。该系列中活性最高的化合物(化合物25)在24 mg / kg x 4天时提供了100%的保护,其他1,2,4-三恶烷22、26、27和30也显示出良好的活性。在该模型中,β-蒿甲醚通过口服途径分别以48 mg / kg x 4天和24 mg / kg x 4天提供100%和20%的保护。化合物25的体外药代动力学特征与参考药物β-蒿醚的相似。活性结果证明在1,2,4-三恶烷药效团的C-5位上的芳基部分很重要。