WO2015109420A1 - 一种空气氧化制备 3-氟代烷基-1-取代吡唑-4-羧酸的方法 - Google Patents
一种空气氧化制备 3-氟代烷基-1-取代吡唑-4-羧酸的方法 Download PDFInfo
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- WO2015109420A1 WO2015109420A1 PCT/CN2014/000163 CN2014000163W WO2015109420A1 WO 2015109420 A1 WO2015109420 A1 WO 2015109420A1 CN 2014000163 W CN2014000163 W CN 2014000163W WO 2015109420 A1 WO2015109420 A1 WO 2015109420A1
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- fluoroalkyl
- carboxylic acid
- preparing
- substituted pyrazole
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- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 17
- IMBBXSASDSZJSX-UHFFFAOYSA-N 4-Carboxypyrazole Chemical class OC(=O)C=1C=NNC=1 IMBBXSASDSZJSX-UHFFFAOYSA-N 0.000 title claims abstract description 14
- 230000003647 oxidation Effects 0.000 title claims abstract description 11
- 238000006243 chemical reaction Methods 0.000 claims abstract description 34
- 239000003054 catalyst Substances 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 9
- LRGBDJBDJXZTTD-UHFFFAOYSA-N 1h-pyrazole-4-carbaldehyde Chemical class O=CC=1C=NNC=1 LRGBDJBDJXZTTD-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000007800 oxidant agent Substances 0.000 claims abstract description 4
- 230000007935 neutral effect Effects 0.000 claims abstract description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 9
- 239000005751 Copper oxide Substances 0.000 claims description 6
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 claims description 6
- 229910000431 copper oxide Inorganic materials 0.000 claims description 6
- 239000001257 hydrogen Substances 0.000 claims description 4
- 229910052739 hydrogen Inorganic materials 0.000 claims description 4
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 2
- 150000001335 aliphatic alkanes Chemical class 0.000 claims description 2
- 229910052801 chlorine Chemical group 0.000 claims description 2
- 125000001309 chloro group Chemical group Cl* 0.000 claims description 2
- 125000001153 fluoro group Chemical group F* 0.000 claims description 2
- 230000001590 oxidative effect Effects 0.000 claims description 2
- QPLDLSVMHZLSFG-UHFFFAOYSA-N Copper oxide Chemical compound [Cu]=O QPLDLSVMHZLSFG-UHFFFAOYSA-N 0.000 claims 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims 1
- 239000001301 oxygen Substances 0.000 claims 1
- 229910052760 oxygen Inorganic materials 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000004128 high performance liquid chromatography Methods 0.000 description 11
- 239000007787 solid Substances 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 9
- 229910052802 copper Inorganic materials 0.000 description 9
- 239000010949 copper Substances 0.000 description 9
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 8
- NMYPMEAFQUDCSC-UHFFFAOYSA-N 5-chloro-3-(difluoromethyl)-1-methylpyrazole-4-carbaldehyde Chemical compound CN1N=C(C(F)F)C(C=O)=C1Cl NMYPMEAFQUDCSC-UHFFFAOYSA-N 0.000 description 6
- 239000000047 product Substances 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- VXTQDSCLSCPLPV-UHFFFAOYSA-N 5-chloro-3-(difluoromethyl)-1-methylpyrazole-4-carboxylic acid Chemical compound CN1N=C(C(F)F)C(C(O)=O)=C1Cl VXTQDSCLSCPLPV-UHFFFAOYSA-N 0.000 description 4
- 238000004895 liquid chromatography mass spectrometry Methods 0.000 description 4
- -1 3-fluorodecyl-1-substituted pyrazole-4-carbaldehyde Chemical class 0.000 description 3
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- PFFIDZXUXFLSSR-UHFFFAOYSA-N 1-methyl-N-[2-(4-methylpentan-2-yl)-3-thienyl]-3-(trifluoromethyl)pyrazole-4-carboxamide Chemical compound S1C=CC(NC(=O)C=2C(=NN(C)C=2)C(F)(F)F)=C1C(C)CC(C)C PFFIDZXUXFLSSR-UHFFFAOYSA-N 0.000 description 2
- NNHXBZAWJIBFFE-UHFFFAOYSA-N 3-(difluoromethyl)-1-methylpyrazole-4-carbaldehyde Chemical compound CN1C=C(C=O)C(C(F)F)=N1 NNHXBZAWJIBFFE-UHFFFAOYSA-N 0.000 description 2
- XTDZGXBTXBEZDN-UHFFFAOYSA-N 3-(difluoromethyl)-N-(9-isopropyl-1,2,3,4-tetrahydro-1,4-methanonaphthalen-5-yl)-1-methylpyrazole-4-carboxamide Chemical compound CC(C)C1C2CCC1C1=C2C=CC=C1NC(=O)C1=CN(C)N=C1C(F)F XTDZGXBTXBEZDN-UHFFFAOYSA-N 0.000 description 2
- YOPDPXKMBYESFW-UHFFFAOYSA-N 5-(difluoromethyl)-1H-pyrazole-4-carbaldehyde Chemical compound FC(C1=NNC=C1C=O)F YOPDPXKMBYESFW-UHFFFAOYSA-N 0.000 description 2
- IGQNDARULCASRN-UHFFFAOYSA-N Fluxapyroxad (bas 700 f)-tp cscd465008 Chemical compound OC(=O)C1=CNN=C1C(F)F IGQNDARULCASRN-UHFFFAOYSA-N 0.000 description 2
- XQJQCBDIXRIYRP-UHFFFAOYSA-N N-{2-[1,1'-bi(cyclopropyl)-2-yl]phenyl}-3-(difluoromethyl)-1-methyl-1pyrazole-4-carboxamide Chemical compound FC(F)C1=NN(C)C=C1C(=O)NC1=CC=CC=C1C1C(C2CC2)C1 XQJQCBDIXRIYRP-UHFFFAOYSA-N 0.000 description 2
- 238000011031 large-scale manufacturing process Methods 0.000 description 2
- GLXDVVHUTZTUQK-UHFFFAOYSA-M lithium;hydroxide;hydrate Chemical compound [Li+].O.[OH-] GLXDVVHUTZTUQK-UHFFFAOYSA-M 0.000 description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 2
- 239000012286 potassium permanganate Substances 0.000 description 2
- 0 *C(*(*=C)c1n[n](*)c(*)c1C=O)F Chemical compound *C(*(*=C)c1n[n](*)c(*)c1C=O)F 0.000 description 1
- RLOHOBNEYHBZID-UHFFFAOYSA-N 3-(difluoromethyl)-1-methylpyrazole-4-carboxylic acid Chemical compound CN1C=C(C(O)=O)C(C(F)F)=N1 RLOHOBNEYHBZID-UHFFFAOYSA-N 0.000 description 1
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 1
- PZOZNOVIRZSNHJ-UHFFFAOYSA-N 5-chloro-1-methyl-3-(trifluoromethyl)pyrazole-4-carbaldehyde Chemical compound CN1N=C(C(F)(F)F)C(C=O)=C1Cl PZOZNOVIRZSNHJ-UHFFFAOYSA-N 0.000 description 1
- IKGVBNQPAJOSFP-UHFFFAOYSA-N 5-chloro-1-methyl-3-(trifluoromethyl)pyrazole-4-carboxylic acid Chemical compound CN1N=C(C(F)(F)F)C(C(O)=O)=C1Cl IKGVBNQPAJOSFP-UHFFFAOYSA-N 0.000 description 1
- 239000005799 Isopyrazam Substances 0.000 description 1
- 239000005816 Penthiopyrad Substances 0.000 description 1
- 239000005834 Sedaxane Substances 0.000 description 1
- OWJSUNGDWUHQDU-UHFFFAOYSA-N [5-chloro-3-(difluoromethyl)-1-methylpyrazol-4-yl]methanol Chemical compound CN1N=C(C(F)F)C(CO)=C1Cl OWJSUNGDWUHQDU-UHFFFAOYSA-N 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000012824 chemical production Methods 0.000 description 1
- 239000012043 crude product Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 235000019253 formic acid Nutrition 0.000 description 1
- 239000000543 intermediate Substances 0.000 description 1
- 238000006213 oxygenation reaction Methods 0.000 description 1
- KHIWWQKSHDUIBK-UHFFFAOYSA-N periodic acid Chemical compound OI(=O)(=O)=O KHIWWQKSHDUIBK-UHFFFAOYSA-N 0.000 description 1
- 239000000575 pesticide Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D231/00—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings
- C07D231/02—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings
- C07D231/10—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
- C07D231/14—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
- C07D231/16—Halogen atoms or nitro radicals
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D231/00—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings
- C07D231/02—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings
- C07D231/10—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
- C07D231/14—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
Definitions
- the invention relates to the technical field of chemical production, in particular to a method for preparing 3 fluorodecyl-1-substituted pyrazole-4-carboxylic acid by air oxidation.
- 3-Fluoroalkyl-1-substituted pyrazole-4-carboxylic acids are important intermediates for some new pesticides, such as Isopyrazam (CAS : 881685-58-1 ) , Sedaxane ( CAS : 874967-67-6 ), Penthiopyrad (CAS: 183675-82-3). Therefore, we have studied the preparation method of it.
- the oxidizing agent for the oxidation of 3-fluorodecyl-1-substituted pyrazole-4-carbaldehyde to 3-fluoroindol-1- 1-pyrazole-4-carboxylic acid is mainly potassium permanganate (. JP2010202649; US6063734, etc.), PCC/periodic acid (W0 2010130767; W0 2011061205, etc.), more sodium hydroxide/hydrogen peroxide (W0 2012065944; W02011151383, etc.). Potassium permanganate, PCC, etc.
- the invention provides a novel method for preparing 3-fluoroalkyl-1-substituted pyrazole-4-carboxylic acid by air oxidation, which is mild, safe and clean, and is suitable for industrial large-scale production.
- a method for preparing 3-fluorodecyl-1-substituted pyrazole-4-carboxylic acid by air oxygenation characterized by: 3-fluoroalkyl-1-substituted pyrazole-4-carbaldehyde I) as a raw material, in a neutral or alkaline ring
- 3-fluoroalkyl-1-substituted pyrazole-4-carbaldehyde I as a raw material, in a neutral or alkaline ring
- the reaction gives 3-fluoroalkyl-1-substituted pyrazole-4-carboxylic acid (formula II);
- R 2 is hydrogen or a fluorine atom
- R 3 is a hydrogen atom or a lower alkane
- X is hydrogen or a chlorine atom.
- the catalyst used is a nano-copper oxide catalyst, and the weight ratio thereof to 3-fluoroalkyl-1-substituted pyrazole-4-carbaldehyde is 0.001-0.1:1; the reaction temperature is controlled at 25 ° C to 50 ° Within the C range.
- the above alkaline environment is achieved by adding sodium hydroxide or potassium hydroxide or lithium hydroxide.
- the method of the present invention is mild in reaction, safe in production, environmentally safe in the reaction process, and suitable for industrialized large-scale production.
- Examples 1 to 3 are exemplified by the preparation of 3-difluoromethyl-1-methyl-5-chloropyrazole-4-carboxylic acid, and Example 4 is Preparation 3- Difluoromethyl-1-methylpyrazole-4-carboxylic acid is taken as an example, and Example 5 is an example of preparing 3-difluoromethylpyrazole-4-carboxylic acid, and Example 6 is to prepare 3-trifluoromethyl.
- the base-1-methyl-5-chloropyrazole-4-carboxylic acid is exemplified, but the invention is not limited to this embodiment.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
- Catalysts (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Plural Heterocyclic Compounds (AREA)
Abstract
提供了一种空气氧化制备3-氟代烷基-1-取代吡唑-4-羧酸的方法,该方法以3-氟代烷基-1-取代吡唑-4-甲醛为原料,在中性或碱性环境中,在催化剂作用下,以空气为氧化剂,反应得到3-氟代烷基-1-取代吡唑-4-羧酸。该方法反应温和、安全、清洁、适合工业化大生产。
Description
一种空气氧化制备 3-氟代烷基- 1 -取代吡唑- 4-羧酸的方法 技术领域
本发明涉及化工生产技术领域, 尤其涉及一种空气氧化制备 3 氟代垸 基- 1-取代吡唑- 4-羧酸的方法。
背景技术
3-氟代烷基- 1-取代吡唑- 4-羧酸是一些新型农药的重要中间体, 如 Isopyrazam ( CAS : 881685-58-1 ) , Sedaxane ( CAS : 874967-67-6 ), Penthiopyrad ( CAS: 183675-82-3 )。 因此我们研究幵发了它的制备方法。
文献对 3-氟代垸基- 1-取代吡唑- 4-甲醛进行氧化得到 3-氟代垸基- 1- 取代吡唑- 4-羧酸的氧化剂主要有高锰酸钾 (. JP2010202649; US6063734 等), PCC/高碘酸 ( W0 2010130767; W0 2011061205 等), 较多使用氢氧化 钠 /双氧水 ( W0 2012065944; W02011151383等)。 高锰酸钾、 PCC等容易造 成环境污染; 而双氧水法, 由于双氧水的不稳定性, 反应温度偏低非常缓 慢, 反应温度偏高, ·'双氧水剧烈分解, 造成'安全隐患。 因此我们研究, 发 明了催化空气氧化新方法。
发明内容
本发明提供一种以空气氧化制备 3-氟代烷基 -1-取代吡唑 -4-羧酸的 新方法, 该方法反应温和、 安全、 清洁, 适合工业化大生产。
本发明采用的技术方案:
一种空气氧'化制备 3-氟代垸基 -1-取代吡唑- 4-羧酸的方法, 其特征在 于: 以 3-氟代烷基- 1-取代吡唑- 4-甲醛 (式 I ) 为原料, 在中性或碱性环
境中, 在催化剂作用下, 以空气为氧化剂, 反应得到 3-氟代烷基 -1-取代 吡唑- 4-羧酸 (式 II);
其中, 、 R2是氢或氟原子, R3是氢原子或 的低级烷烃, X 是氢 或氯原子。
反应过程中, 所用催化剂为纳米氧化铜催化剂, 其与 3-氟代烷基 -1-取 代吡唑 -4-甲醛的重量比为 0.001-0.1: 1; 反应温度控制在 25°C〜 50°C范 围内。
上述碱性环境是通过加氢氧化钠或氢氧化钾或氢氧化锂来实现。
本发明的有益效果: 本发明的方法反应温和, 生产安全, 反应过程环 保安全, 适合工业化大生产。
具体实施方式
以下是本发明的具体实施例,其中实施例 1〜3是以制备 3-二氟甲基- 1- 甲基- 5-氯吡唑 -4-甲酸为例、 实施例 4 是以制备 3-二氟甲基- 1-甲基吡唑 -4-甲酸为例、 实施例 5 是以制备 3-二氟甲基吡唑 -4-甲酸为例、 实施例 6是 以制备 3-三氟甲基 -1-甲基 -5-氯吡唑 -4-甲酸为例, 但本发明并不限于此实施 例。
实施例 1
在 1000 mL 反应瓶中, 加入 38.9g 3 二氟甲基- 1-甲基 -5-氯吡唑 _4_甲 醛和 390ml 水, 再加入 8.4g氢氧化钠, 进行搅拌, 然后加入 lg纳米氧化铜, 控制反应温度为 25-30°C, 通空气进行氧化反应 15 小时, 使 HPLC 原料即 3_二
氟甲基 -1-甲基- 5-氯吡唑 -4-甲醛的量小于总量的 0.2%; 停止反应, 过滤, 回 收铜催化剂。 将反应液冷却至 10Ό以下, 加 31%盐酸酸化到 pH值为 1-2, 析出 固体, 过滤; 固体以少量水洗漆; 干燥得到产品 3-二氟甲基 -1-甲基- 5-氯吡唑 _4-甲酸 40g, HPLC含量为 99%; IX - MS: m/e=210。
实施例 2
在 1000 mL 反应瓶中, 加入 38.9g 3-二氟甲基 -1-甲基- 5-氯吡唑 -4 -甲 醛和 390ml水, 再加入 12.6g—水合氢氧化锂, 进行搅拌, 然后加入 2g纳米氧 化铜, 控制反应温度为 40-50°C, 通空气进行氧化反应 15小时, 使 HPLC原料即 3 -二氟甲基- 1-甲基 -5-氯吡唑 -4-甲醛的量小于总量的 0.2%; 停止反应, 过 滤, 回收铜催化剂。将反应液冷却至 10Ό以下, 加 31%盐酸酸化到 pH值为 1-2, 析出固体, 过滤; 固体以少量水洗漆; 干燥得到产品 3-二氟甲基 -1-甲基- 5- 氯吡唑 -4-甲酸 40g, HPLC含量为 95% , 含少量 3_二氟甲基- 1 -甲基- 5_氯吡唑 _4-甲醇; LC-MS: m/e=210。
实施例 3
在 1000 mL 反应瓶中, 加入 38.9g 3 -二氟甲基 - 1 -甲基- 5-氯吡唑 -4-甲 醛, 390ml水, 加入 9. lg 90%氢氧化钾, 进行搅拌, 然后加入 0.8g纳米氧化铜, 控制反应温度为 25- 30°C, 通空气进行氧化反应 24 小时, 使 HPLC 原料即 3 -二 氟甲基 -1-甲基 -5-氯吡唑 -4-甲醛的量小于总量的 0.2%; 停止反应, 过滤, 回收铜催化剂。 将反应液冷却至 10°C以下, 加 31%盐酸酸化到 pH值为 1-2, 析 出固体, 过滤; 固体以少量水洗涤; 干燥得到产品 3-二氟甲基- 1-甲基- 5-氯吡 唑- 4 -甲酸 40g, HP1 含量为 99% ; IX- MS: m/e = 210。
实施例 4
在 1000 mL .反应瓶中, 加入 32g 3-二氟甲基- 1-甲基吡唑- 4-甲醛, 390ml 水, 加入 8.4g 氢氧化钠, 进行搅拌, 加入 2g 纳米氧化铜, 控制反应温度为
25 - 30°C, 通空气进行氧化反应 24 小时, 使 HPLC 原料即 3-二氟甲基- 1 -甲基 吡唑 -4-甲醛的量小于总量的 0.2%; 停止反应, 过滤, 回收铜催化剂。 将反应 液冷却至 10Ό以下, 加 31%盐酸酸化到 pH值为 1-2, 析出固体, 过滤; 固体以 少量水洗涤; 干燥得到产品 3-二氟甲基 -1-甲基吡唑 -4-甲酸 32g, HPLC含量为 99%; LC-MS: m/e=176。
实施例 5
在 1000 mL反应瓶中, 加入 29.2g 3-二氟甲基吡唑- 4-甲醛, 58.4ml水, 进行搅拌, 加入 2g纳米氧化铜, 控制反应温度为 25- 30°C, 通空气进行氧化反 应 48小时, 使 HPLC原料即 3-二氟甲基吡唑 -4-甲醛的量小于总量的 1%; 停止 反应, 过滤, 得粗产品 (含铜催化剂); 将固体二氯甲垸溶解; 过滤, 回收铜催 化剂, 滤液浓缩得产品 3-二氟甲基吡唑 -4-甲酸 30g, HPLC含量为 98% ; LC-MS: m/e=162。
实施例 6
在 1000 mL 反应瓶中, 加入 42.5g 3-三氟甲基 - 1 -甲基- 5_氯吡唑 -4-甲 醛, 425ml水, 加入 8.4g氢氧化钠, 进行搅拌, 加入 4.2g纳米氧化铜, 控制反 应温度为 25-30°C , 通空气进行氧化反应 15 小时, 使 HPLC原料即 3-二氟甲基 - 1 -甲基 -5-氯吡唑 -4-甲醛的量小于总量的 0.2%; 停止反应, 过滤, 回收铜催 化剂。 将反应液冷却至小于 10°C, 加 31%盐酸酸化到 pH值为 1-2, 析出固体, 过滤; 固体以少量水洗涤; 干燥得产品 3-三氟甲基- 1-甲基- 5-氯吡唑 -4-甲酸 43g, HPLC含量为 99% ; LC-MS: m/e=228。
Claims
1、 一种空气氧 · 备 3-氟代烷基- 1-取代吡唑- 4-羧酸的方法, 其特征在 于: 以 3-氟代垸基- 1'-取代吡唑- 4-甲醛 (式 · I ) 为原料, 在中性或碱性环 境中, 在催化剂作用下, 以空气为氧化剂, '反应得到 3-氟代烷基 -1-取代 吡唑- 4-羧酸 (式 II);
2、 根据权利要求 1 所述的一种空气氧化制备 3-氟代垸基- 1-取代吡唑 -4- 羧酸的方法, 其特征在于: 所述催化剂为纳米氧化铜催化剂。
3、 根据权利要求 1 或 2所述的一种空气氧化制备 3-氟代垸基- 1-取代吡唑 - 4 -羧酸的方法, 其特征在于: 所述催化剂与 3-氟代烷基 -1 取代吡唑- 4 - 甲醛的重量比为 0.001-0.1: 1。
4、 根据权利要'求 ·1 所述的一种空气氧化制备 3-氟代垸基 -1-取代吡唑- 4 - 羧酸的方法, 其特征''在于: 所述碱性环境是通过加氢氧化钠或氢氧化钾或 氢氧化锂来实现。 '
5、 根据权利要求 1 所述的一种空气氧化制备 3-氟代垸基 -1-取代吡唑- 4 - 羧酸的方法, 其特征在于: 反应过程中温度控制在 25°C〜50°C范围内。
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