Efficient,One-Pot Synthesis of Triazolothiadiazinyl-pyrazolone and Pyrazolyl-triazolothiadiazine Derivatives via Multicomponent Reaction

A one-pot, multicomponent reaction of 3-(2-bromo acetyl)coumarins, 4-amino-5-hydrazino-4H-[1,2,4]triazole-3-thiol, and different derivatives of ethyl 2-(2-(aryl)hydrazono)-3-oxobutanoates provide an efficient and direct method for the synthesis of 4-(arylydrazono)-3-methyl-1-(6-(coumarin-3-yl)-7H-[1,2,4]triazolo[3,4-b][1,3,4]thiadiazin-3-yl)-1H-pyrazol-5(4H)-ones (4a–h). A similar methodology was also developed for the synthesis of pyrazolyl-triazolothiadiazines (9a–f) using acetyl acetone, 4-amino-5-hydrazino-4H-[1,2,4]triazole-3-thiol, and different derivatives of phenacylbromide. The resulting products were characterized by analytical and spectral data.     

Synthesis of Pyrazole Derivatives Possessing Anticancer Activity: Current Status

Pyrazole is a versatile lead compound to design potent bioactive molecules for drug discovery and development, particularly in cancer therapy. The aim of this review is to present the most recent deeds in the field of synthetic route made for functionalized pyrazole derivatives active against cell proliferation disease. The review article covers the synthesis of 1H-pyrazole, synthesis of N-substituted pyrazoles, synthesis of pyrazolopyrazoles, and synthesis of pyrazoles fused with a naturally occurring moiety. Some of these reported compounds have passed the preclinical or initial-phase clinical trials for their anticancer activity.     

A four-component synthesis of dihydropyrano[2,3-c]pyrazoles in a new water-based worm-like micellar medium

Cocamidopropyl betaine (CAPB) as a biodegradable surfactant produces a new worm-like micellar medium for rapid synthesis of dihydropyrano[2,3-c]pyrazoles via a four-component reaction of aldehydes, ethyl acetoacetate, malononitrile, and hydrazine hydrate at 50–60 °C. This zwitterionic surfactant was superior to anionic, cationic, and nonionic alternatives for accessing high yields of pure products without the use of any organic solvent. While the reaction medium was reusable, simple isolation of products, mild reaction conditions, low loading of CAPB for critical micelle concentration and short reaction times are additional advantages of this green procedure.     

新型含二苯醚的吡唑类化合物的合成及其生物活性

以溴苯和取代酚为原料,经Friedel-Crafts、缩合、环化和醚化反应,合成了6个新型的含二苯醚的吡唑类化合物——5-(4-取代基氧基苯基)-1-苯基-3-三氟甲基-1H-吡唑(5a~5e),收率51%~66%,其结构经1H NMR,ESI-MS和元素分析表征。初步生物活性测试结果表明:5a~5e均对小麦和油菜的发芽率、根系和茎的生长有一定调节作用。     

液相色谱-串联质谱法同时测定葡萄酒中6种吡唑类杀菌剂

采用液相色谱-串联质谱建立了同时测定葡萄酒中戊苯吡菌胺、氟唑菌酰胺、吡唑萘菌胺、吡咪唑、联苯吡菌胺、呋吡菌胺6种吡唑类杀菌剂的分析方法。样品用超纯水稀释混匀,经HLB固相萃取柱净化后,采用Agilent ZOBRAX C18色谱柱(2.1 mm×150 mm,5μm)分离;以0.1%乙酸水溶液-乙腈为流动相进行梯度洗脱,目标分析物在多反应监测(MRM)模式下进行定性分析,外标法定量。在优化实验条件下,6种吡唑类杀菌剂在1.0~50.0μg·L-1范围内呈良好的线性关系,相关系数(r2)均不低于0.999 3,方法定量下限为0.1~0.4μg·kg-1。在低、中、高3个加标水平下的平均回收率为72.8%~92.6%,相对标准偏差(RSD)不大于6.7%。该方法简便快速、灵敏度高,可用于葡萄酒中吡唑类杀菌剂的测定。     

Synthesis and Properties of Azoles Containing Benzothiazole Substituents. (Review)

The results from investigations into the synthesis and properties of five-membered nitrogen-containing heterocycles with several heteroatoms, including benzothiazole fragments, are reviewed.     

Synthesis,crystal structure,and insecticidal evaluation of novel aryl pyrazole compounds containing aminophosphonate moiety

A series of novel aryl pyrazole derivatives containing aminophosphonate were designed and synthesized on the basis of the commercial insecticide Fipronil. Their structures were confirmed by ¹H NMR, FT-IR, elemental analysis, and compound 4 m was characterized by a single crystal X-ray diffraction analysis. The results of the preliminary bioassays showed that title compounds exhibited satisfactory insecticidal activities against Culex pipiens and Musca domestica. The introduction of an electron-withdrawing group to the para-position of the benzene ring was essential for high bioactivity.     

Morpholine triflate promoted one-pot,four-component synthesis of dihydropyrano[2,3-c] pyrazoles

A one-pot,four-component reaction of ethyl acetoacetate,hydrazine hydrate,aldehydes,and malononitrile was discussed using Lewis acid catalyst morpholine triflate (MorT) to afford a series of dihydropyrano[2,3-c] pyrazoles,which were generally catalyzed by organic alkalis.Moderate to excellent yields,no chromatographic purification,and evasion of environmentally hazardous solvents in the reaction process make this protocol very useful for academia and industry.