避氧化物
2,4,5-三氟苯乙酸是一种白色固体,用于合成治疗II型糖尿病的新药sitagliptin的中间体。sitagliptin是默克公司最新上市的首个DPP-IV抑制剂,其在治疗II型糖尿病方面疗效好、副作用小、安全性和耐受性佳,市场前景广阔。
制备 步骤1:2,4,5-三氟苄基氯化镁的制备在250毫升装有三个颈管的烧瓶中,进行氮气保护,并在室温下依次加入四氢呋喃120毫升和7.2克(0.45摩尔)的镁屑。搅拌过程中,缓慢滴加1,2-二溴乙烷0.56克(0.003摩尔),待温度升至30℃后,再缓慢滴加2,4,5-三氟苄氯9克(0.05摩尔),保持溶液微沸。随后,在温度升至60℃时继续滴加2,4,5-三氟苄氯45克(0.25摩尔),并维持反应约5-6小时,直至镁屑基本消失,从而制得2,4,5-三氟苄基氯化镁。
步骤2:2,4,5-三氟苯乙酸的制备在氮气保护条件下,将步骤1所得含有2,4,5-三氟苄基氯化镁61克的反应液中分批加入干冰10克×3次。每隔3小时加入一次,控制反应温度在0℃至15℃之间。待干冰完全加入后,在0℃至28℃下继续反应3-4小时。
然后将上述反应液缓慢滴入到冰水混合物中的2摩尔/升HCl溶液中,并用乙酸乙酯进行三次萃取,每次使用30克。合并有机相并使用40克饱和食盐水洗涤两次后,通过无水硫酸钠干燥、过滤、蒸发滤液得粗制的2,4,5-三氟苯乙酸54克。经甲醇140毫升重结晶处理后,最终得到纯净的2,4,5-三氟苯乙酸50.7克。
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
2,4,5-三氟苯乙酸甲酯 | methyl 2-(2,4,5-trifluorophenyl)acetate | 1036273-20-7 | C9H7F3O2 | 204.149 |
2,4,5-三氟苯乙酸乙酯 | ethyl 2-(2,4,5-trifluorophenyl)acetate | 1256470-41-3 | C10H9F3O2 | 218.175 |
2,4,5-三氟苯乙醇 | 2-(2,4,5-trifluorophenyl)ethanol | 883267-70-7 | C8H7F3O | 176.138 |
2-(2,4,5-三氟苯基)乙醛 | 2-(2,4,5-trifluorophenyl)acetaldehyde | 111991-20-9 | C8H5F3O | 174.122 |
2,4,5-三氟扁桃酸 | 2,4,5-trifluoromandelic acid | 375369-29-2 | C8H5F3O3 | 206.121 |
—— | (2,4,5-trifluorophenyl)oxoacetic acid | 1702443-94-4 | C8H3F3O3 | 204.105 |
2-(2,4,5-三氟苯基)-2-氯乙酸 | 2-(2,4,5-trifluorophenyl)-2-chloroacetic acid | 1036273-14-9 | C8H4ClF3O2 | 224.567 |
3-(2,4,5-三氟苯基)-1-丙烯 | 1-allyl-2,4,5-trifluorobenzene | 680993-47-9 | C9H7F3 | 172.15 |
2,4,5-三氟苯乙腈 | 2-(2,4,5-trifluorophenyl)acetonitrile | 220141-74-2 | C8H4F3N | 171.122 |
—— | 2,4,5-tri-fluorobenzoylformic acid ethyl ester | —— | C10H7F3O3 | 232.159 |
2-(2,4,5-三氟苯基)丙二酸二乙酯 | 1,3-diethyl 2-(2,4,5-trifluorophenyl)malonate | 262609-08-5 | C13H13F3O4 | 290.239 |
—— | 2,4,5-trifluorobenzene-1-carbonyl cyanide | 2091697-40-2 | C8H2F3NO | 185.105 |
2,4,5-三氟甲苯 | 2,4,5-trifluorotoluene | 887267-34-7 | C7H5F3 | 146.112 |
2-氯-1-(2,4,5-三氟苯基)乙酮 | 2-chloro-1-(2,4,5-trifluorophenyl)ethanone | 129604-31-5 | C8H4ClF3O | 208.567 |
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
2,4,5-三氟苯乙酸甲酯 | methyl 2-(2,4,5-trifluorophenyl)acetate | 1036273-20-7 | C9H7F3O2 | 204.149 |
2,4,5-三氟苯乙酸乙酯 | ethyl 2-(2,4,5-trifluorophenyl)acetate | 1256470-41-3 | C10H9F3O2 | 218.175 |
2,4,5-三氟苯乙醇 | 2-(2,4,5-trifluorophenyl)ethanol | 883267-70-7 | C8H7F3O | 176.138 |
2-(2,4,5-三氟苯基)乙醛 | 2-(2,4,5-trifluorophenyl)acetaldehyde | 111991-20-9 | C8H5F3O | 174.122 |
—— | α-bromo-(2,4,5-trifluorophenyl)acetic acid | 251366-49-1 | C8H4BrF3O2 | 269.018 |
—— | 1,3-Bis-(2,4,5-trifluoro-phenyl)-propan-2-one | 881995-71-7 | C15H8F6O | 318.218 |
—— | 2-(2,4,5-trifluorophenyl)acetohydrazide | —— | C8H7F3N2O | 204.152 |
西他列汀杂质26 | 2,4,5-trifluorophenylacetoacetic acid | 1256815-03-8 | C10H7F3O3 | 232.159 |
(3S)-2’,4’,5’-三氟-3-羟基苯丁酸 | 4-(2,4,5-trifluorophenyl)-3(S)-hydroxybutanoic acid | 868071-17-4 | C10H9F3O3 | 234.175 |
3-氧代-4-(2,4,5-三氟苯基)丁酸甲酯 | methyl 4-(2,4,5-trifluorophenyl)acetoacetate | 769195-26-8 | C11H9F3O3 | 246.186 |
—— | (R)-methyl 3-hydroxy-4-(2,4,5-trifluorophenyl)butanoate | 1138326-05-2 | C11H11F3O3 | 248.202 |
—— | 3(S)-4-(2,4,5-trifluorophenyl)-3-hydroxybenzenebutanoic acid methyl ester | 868071-16-3 | C11H11F3O3 | 248.202 |
3-氧代-4-(2,4,5-三氟苯基)丁酸甲酯 | ethyl 3-oxo-4-(2,4,5-trifluorophenyl)butanoate | 1151240-88-8 | C12H11F3O3 | 260.213 |
(R)-3-氨基-4-(2,4,5-三氟苯基)丁酸 | (R)-3-amino-4-(2,4,5-trifluorophenyl)butyric acid | 936630-57-8 | C10H10F3NO2 | 233.19 |
A series of novel 3-aryl-4-hydroxy-2(5H) furanone-acrylate hybrids were designed and synthesized based on the natural butenolides and acrylates scaffolds. The structures of the prepared compounds were characterized by 1H-NMR, 13C-NMR and electrospray ionization mass spectrometry (ESI-MS), and the bioactivity of the target compounds against twelve phytopathogenic fungi was investigated. The preliminary in vitro antifungal activity screening showed that most of the target compounds had moderate inhibition on various pathogenic fungi at the concentration of 100 mg·L−1, and presented broad-spectrum antifungal activities. Further studies also indicated that compounds 7e and 7k still showed some inhibitory activity against Pestallozzia theae, Sclerotinia sclerotiorum and Gibberella zeae on rape plants at lower concentrations, which could be optimized as a secondary lead for further research.