介绍了从 4-烷氧基-1,1,1-三氟-3-烯烃-2 反应合成一系列 1-叔丁基-3(5)-(三氟甲基)-1H-吡唑的研究-ones [CF3C(O)CH=C(R1)(OR),其中 R = Et 且 R1 = H 或 R = Me 且 R1 = Me、Ph、4-Me-C6H4、4-MeO-C6H4、4- F-C6H4、4-Cl-C6H4、4-Br-C6H4、4-I-C6H4、fur-2-yl、thien-2-yl或naphth-2-yl]与叔丁基肼盐酸盐。当[BMIM][BF4](1-丁基-3-甲基咪唑四氟硼酸盐)和吡啶用作反应介质时,我们得到了1-叔丁基-3(5)-三氟甲基吡唑的混合物。当反应在乙醇中的 NaOH 中进行时,会形成具有高区域选择性的 5-三氟甲基-1-叔丁基-1H-吡唑。4-烷氧基-1,1水解后,生成1-叔丁基-3-三氟甲基-1H-吡唑,
A highlyregioselectivesynthesis of 1-aryl-3,4,5-substituted pyrazoles based on the condensation of 1,3-diketones with arylhydrazines is described. The reaction proceeds at room temperature in N,N-dimethylacetamide and furnishes pyrazoles in 59-98% yields.
Synthesis, Fungicidal Activity and Mode of Action of 4-Phenyl-6-trifluoromethyl-2-aminopyrimidines against Botrytis cinerea
作者:Chunhui Liu、Zining Cui、Xiaojing Yan、Zhiqiu Qi、Mingshan Ji、Xinghai Li
DOI:10.3390/molecules21070828
日期:——
Anilinopyrimidines are the main chemical agents for management of Botrytis cinerea. However, the drug resistance in fungi against this kind of compounds is very serious. To explore new potential fungicides against B. cinerea, a series of 4-phenyl-6-trifluoromethyl-2-amino-pyrimidine compounds (compounds III-1 to III-22) were synthesized, and their structures were confirmed by 1H-NMR, IR and MS. Most of these compounds possessed excellent fungicidal activity. The compounds III-3 and III-13 showed higher fungicidal activity than the positive control pyrimethanil on fructose gelatin agar (FGA), and compound III-3 on potato dextrose agar (PDA) indicated high activity compared to the positive control cyprodinil. In vivo greenhouse results indicated that the activity of compounds III-3, III-8, and III-11 was significantly higher than that of the fungicide pyrimethanil. Scanning electron micrography (SEM) and transmission electron micrography (TEM) were applied to illustrate the mechanism of title compounds against B. cinerea. The title compounds, especially those containing a fluorine atom at the ortho-position on the benzene ring, could maintain the antifungal activity against B. cinerea, but their mechanism of action is different from that of cyprodinil. The present study lays a good foundation for us to find more efficient reagents against B. cinerea.
enantioselective bifunctionalsquaramide‐catalyzed detrifluoroacetylativealkylationreaction has been developed under electrochemical conditions. The unified strategy based on this key tandem methodology has been divergently explored for the asymmetric synthesis of fluorine‐containing target molecules with good stereocontrol (up to 95 % ee). Furthermore, this asymmetric catalytic reaction combines the
Design and synthesis of novel celecoxib analogues as selective cyclooxygenase-2 (COX-2) inhibitors: replacement of the sulfonamide pharmacophore by a sulfonylazide bioisostere
作者:Md.Jashim Uddin、P.N.Praveen Rao、Edward E. Knaus
DOI:10.1016/j.bmc.2003.07.005
日期:2003.11
NH(2) of Arg(513) in the secondary pocket of COX-2. These observations indicate that an appropriately positioned SO(2)N(3) moiety is a novel alternative bioisostere to the traditional SO(2)NH(2) and SO(2)Me pharmacophores present in selective COX-2inhibitors, that are only capable of H-bonding interactions with the COX-2 isozyme, for use in drug design.
First synthesis of functionalized 5-aryl-3-(trifluoromethyl)phenols by regioselective [3+3] cyclocondensations of 1,3-bis(silyloxy)-1,3-butadienes with 3-aryl-3-silyloxy-1-trifluoromethyl-2-en-1-ones
A variety of functionalized 5-aryl-3-(trifluoromethyl)phenols were prepared by the first TiCl4-mediated [3+3] cyclocondensation of 1,3-bis(trimethylsilyloxy)-1,3-butadienes with 3-aryl-3-trimethylsilyloxy-1-trifluoromethyl-2-en-1-ones.