Synthesis of 3-Cyanopyrazoles from 3-Trifluoromethyl-pyrazoles via Direct Ammonolysis Reaction
摘要:
A simple and green method to prepare 3-cyanopyrazoles in aqueous ammonia from easy-obtained 3-trifluoromethyl-pyrazoles was explored. Most substrates got acceptable yields. The hydrogen position of Nl-H on cyanopyrazoles was assigned by X-ray crystal structure analysis.
Silver-Mediated Cycloaddition of Alkynes with CF<sub>3</sub>CHN<sub>2</sub>: Highly Regioselective Synthesis of 3-Trifluoromethylpyrazoles
作者:Feng Li、Jing Nie、Long Sun、Yan Zheng、Jun-An Ma
DOI:10.1002/anie.201301870
日期:2013.6.10
Silver screen: The title reaction provides a convenient and efficient method for the construction of 5‐substituted 3‐trifluoromethylpyrazoles under mild reaction conditions. By using this protocol, the marketed drug Celecoxib (antiarthritic) could be easily synthesized (see scheme; DMF=N,N‐dimethylformamide).
is reported that occurs by the three-component coupling of environmentally friendly and large-tonnage industrial feedstock 2-bromo-3,3,3-trifluoropropene (BTP), aldehydes, and sulfonylhydrazides. This highly regioselective three-component reaction is metal-free, catalyst-free, and operationally simple and features mild conditions, a broad substrate scope, high yields, and valuable functional group
Cycloaddition of Trifluoroacetaldehyde <i>N</i>-Triftosylhydrazone (TFHZ-Tfs) with Alkynes for Synthesizing 3-Trifluoromethylpyrazoles
作者:Hongwei Wang、Yongquan Ning、Yue Sun、Paramasivam Sivaguru、Xihe Bi
DOI:10.1021/acs.orglett.0c00395
日期:2020.3.6
(TFHZ-Tfs) and alkynes is reported. This protocol provides an operationally simple and general method for the synthesis of diverse 3-trifluoromethylpyrazoles in good to excellent yields with broad substrate scope, including aryl, heteroaryl, and alkyl terminalalkynes, and electron-deficient internalalkynes. The synthetic potential of this method was further demonstrated by the synthesis of an antiarthritic
Haloacetylated enol ethers 10. Condensation of β-alkoxyvinyl trifluoromethyl ketones with thiosemicarbazide. Synthesis of new trifluoromethyl 4,5-dihydro-1H-1-pyrazolethiocarboxyamides
thiocarboxyamides (2a–g) from the direct cyclo-condensation reaction of β-alkoxyvinyltrifluoromethylketones (1a–g) with thiosemicarbazide in methanol, under mild conditions, is reported. Similarly, the 1H-1-pyrazolethiocarboxyamide derivatives (2a–g) were easily dehydrated and the thiocarboxyamide group hydrolyzed in a one-step reaction by stirring with concentrated sulfuric acid to give the 3-a
3-芳基的合成[烷基] -5-羟基-5-三氟甲基-4,5-二氢ħ -1- pyrazolethiocarboxyamides(2A-G从β-烷氧基乙烯基三氟甲基酮的直接环缩合反应)(1A报道了在温和条件下用硫代氨基脲在甲醇中生成–g)。同样,1 H -1-吡唑硫代羧酰胺衍生物(2a–g)易于脱水,硫代羧酰胺基团通过与浓硫酸搅拌一步反应水解,得到3-芳基[烷基] -5-三氟甲基-1 H-吡唑类(3a–g)收率高。3-芳基[烷基] -5-羟基-5-三氟甲基-4,5-二氢-1 H的特定合成和物理性质此处首次报道了-1-吡唑硫代羧酰胺。
Compounds and their use for reducing uric acid levels
申请人:Acquist LLC
公开号:US10752613B2
公开(公告)日:2020-08-25
Bifunctional compounds that increase uric acid excretion and reduce uric acid production, and monofunctional compounds that either increase uric acid excretion or reduce uric acid production. Methods of using these compounds for reducing uric acid levels in blood or serum, for treating disorders of uric acid metabolism, and for maintaining normal uric acid levels in blood or serum are also provided. Pharmaceutical compositions comprising the bifunctional and monofunctional compounds are also provided.