CN117069611A - 一种1-(2,4,6-三氯苯基)丙-2-酮o-甲基肟的制备方法 - Google Patents
一种1-(2,4,6-三氯苯基)丙-2-酮o-甲基肟的制备方法 Download PDFInfo
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- MCJGNVYPOGVAJF-UHFFFAOYSA-N quinolin-8-ol Chemical compound C1=CN=C2C(O)=CC=CC2=C1 MCJGNVYPOGVAJF-UHFFFAOYSA-N 0.000 claims description 2
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- 229910052742 iron Inorganic materials 0.000 description 1
- YEYSNJKFDGOAAP-UHFFFAOYSA-N n-methoxy-1-(2,4,6-trichlorophenyl)propan-2-amine Chemical compound CONC(C)CC1=C(Cl)C=C(Cl)C=C1Cl YEYSNJKFDGOAAP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C249/00—Preparation of compounds containing nitrogen atoms doubly-bound to a carbon skeleton
- C07C249/04—Preparation of compounds containing nitrogen atoms doubly-bound to a carbon skeleton of oximes
- C07C249/08—Preparation of compounds containing nitrogen atoms doubly-bound to a carbon skeleton of oximes by reaction of hydroxylamines with carbonyl compounds
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
- C07C45/61—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups
- C07C45/67—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups by isomerisation; by change of size of the carbon skeleton
- C07C45/68—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reactions not involving the formation of >C = O groups by isomerisation; by change of size of the carbon skeleton by increase in the number of carbon atoms
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
本发明公开了一种1‑(2,4,6‑三氯苯基)丙‑2‑酮O‑甲基肟的制备方法,所述方法包括:以2,4,6‑三氯溴苯为起始原料,加入溶剂、配体、碘化亚铜、碱和乙酰乙酸乙酯,用氮气置换三次,在60~140℃搅拌反应24~36h,反应结束后,将反应液加入盐酸,一锅法脱羧水解,重结晶得到2,4,6‑三氯苯丙‑2‑酮,上述酮和甲氧基胺盐酸盐在溶剂中反应得到1‑(2,4,6‑三氯苯基)丙‑2‑酮O‑甲基肟。本发明相较于三氯苯甲醛和2,4,6‑三氯溴苯价格低,该发明一锅法步骤合成收率在65%~75%之间,总收率在62%~72%之间,和现有合成路线总收率相比,收率较高,避免了传统路线收率低,杂质较多的问题,仅需重结晶操作就可得到2,4,6‑三氯苯丙‑2‑酮,肟化步骤仅需水洗即可拿到目标产物。
Description
技术领域
本发明属于有机合成技术领域,具体涉及一种1-(2,4,6-三氯苯基)丙-2-酮O-甲基肟的制备方法。
背景技术
1-(2,4,6-三氯苯基)丙-2-酮O-甲基肟是一种重要的农药中间体,主要合成琥珀酸脱氢酶抑制剂类(SDHIs)杀菌剂。它可以进一步合成O-甲基-N-[1-甲基-2-(2,4,6-三氯苯基)乙基]羟胺,而它是合成杀菌剂氟唑菌酰羟胺的重要中间体。1-(2,4,6-三氯苯基)丙-2-酮O-甲基肟的分子式为C10H10Cl3NO,相对分子质量为266.55,分子结构式为:
现有的制备1-(2,4,6-三氯苯基)丙-2-酮O-甲基肟的方法主要有如下两种:
方法(1)以2,4,6-三氯苯胺为原料,经过重氮化和偶联两步一锅法生成2,4,6-三氯苯丙-2-酮,后经过肟化得到目标产物,其反应方程式如下所示:
不过该类方法存在反应收率不高,一锅法步骤收率仅为48%,两步总收率为44%,副反应较多等缺点。
方法(2)以2,4,6-三氯苯甲醛为原料,在乙酸溶液中和硝基乙烷反应得到1,3,5-三氯-2-硝基-丙烯基-苯,在盐酸中经过铁粉还原得到2,4,6-三氯苯丙-2-酮,之后肟化得到目标产物,其反应方程式如下所示:
该方法存在原料2,4,6-三氯苯甲醛价格昂贵且不易购得,制备成本较高,合成2,4,6-三氯苯丙-2-酮的两步合成收率仅为50%,三步总收率仅为38%,收率较低,还原反应后的铁泥难以处理,易造成环境污染,合成步骤较为繁琐等缺点。
发明内容
本发明针对现有技术中存在的缺陷,提供一种高效、快捷和较为经济的1-(2,4,6-三氯苯基)丙-2-酮O-甲基肟的制备方法。以2,4,6-三氯溴苯为起始原料,在配体和碘化亚铜作催化剂条件下,和乙酰乙酸乙酯发生偶联,后经过一锅法脱羧水解得到2,4,6-三氯苯丙-2-酮,再肟化得到目标产物。
本发明采用的技术方案如下:
一种1-(2,4,6-三氯苯基)丙-2-酮O-甲基肟的制备方法,包括如下步骤:
1)以2,4,6-三氯溴苯为起始原料,加入溶剂、配体、碘化亚铜、碱和乙酰乙酸乙酯,用氮气置换三次,在60~140℃搅拌反应24~36h,反应结束后,将反应液加入盐酸,一锅法脱羧水解,重结晶得到2,4,6-三氯苯丙-2-酮;
2)2,4,6-三氯苯丙-2-酮和甲氧基胺盐酸盐在溶剂中反应得到1-(2,4,6-三氯苯基)-丙-2-酮O-甲基肟;
步骤1)中所述配体为下列之一:2-吡啶羧酸、8-羟基喹啉、N1,N2-二([1,1'-联苯]-2-基)草酰胺、N1,N2-二苯基草酰胺、2-氧代-2-(苯基氨基)乙酸;所述溶剂为下列之一:四氢呋喃、1,4-二氧六环、乙酸乙酯;所述碱为下列之一:碳酸钠、碳酸钾、磷酸钾、碳酸铯;
步骤2)中所述溶剂为下列之一:水、乙醇、甲醇、甲醇和水混合溶液、乙醇和水混合溶液。
进一步地,所述2,4,6-三氯溴苯、配体和碘化亚铜的物质的量之比为1:0.05~0.4:0.05~0.2。
进一步地,所述碱与2,4,6-三氯溴苯的物质的量之比为1~3:1。
进一步地,所述乙酰乙酸乙酯与2,4,6-三氯溴苯的物质的量之比为1~3:1。
进一步地,所述反应温度为100~140℃,反应时间为24~28h。
进一步地,所述步骤1)中溶剂与2,4,6-三氯溴苯质量比为5~10:1。
进一步地,所述步骤2)中溶剂为乙醇和水的混合溶剂。
进一步地,步骤1)中2,4,6-三氯溴苯、配体和碘化亚铜的物质的量之比为1:0.2:0.1,乙酰乙酸乙酯与2,4,6-三氯溴苯的物质的量之比为2~3:1,碱与2,4,6-三氯溴苯的物质的量之比为2~3:1,反应温度为120℃,反应时间为28h;步骤2)中溶剂乙醇和水的混合溶剂的体积比为乙醇:水=4:1。
进一步地,步骤1)中反应液用甲醇重结晶直接得到2,4,6-三氯苯丙-2-酮。
本发明的反应方程式如下:
与现有技术相比,本发明的有益效果主要体现在:
1、本发明实现了从2,4,6-三氯溴苯为起始原料,相较于三氯苯甲醛,2,4,6-三氯溴苯价格低。
2、本发明改变了1-(2,4,6-三氯苯基)丙-2-酮O-甲基肟的合成路线,该发明一锅法步骤合成收率在65%~75%之间,总收率在62%~72%之间,和现有两条合成路线总收率分别为38%和44%相比,收率较高,避免了传统路线收率低,杂质较多的问题。
3、本发明一锅法步骤仅需重结晶操作就可得到2,4,6-三氯苯丙-2-酮,肟化步骤仅需水洗即可拿到目标产物。
附图说明
图1为实施例1制备得到的2,4,6-三氯苯丙-2-酮的1H NMR谱图;
图2为实施例1制备得到的2,4,6-三氯苯丙-2-酮的13C NMR谱图;
图3为实施例1制备得到的1-(2,4,6-三氯苯基)丙-2-酮O-甲基肟的1H NMR谱图;
图4为实施例1制备得到的1-(2,4,6-三氯苯基)丙-2-酮O-甲基肟的13C NMR谱图。
具体实施方式
下面结合具体实施例对本发明进行进一步描述,但本发明的保护范围并不仅限于此。
实施例1:1-(2,4,6-三氯苯基)丙-2-酮O-甲基肟的合成
在一个25mlSchlenk反应器中加入磁子,依次加入2,4,6-三氯溴苯0.369g,碘化亚铜0.027g,2-吡啶羧酸0.035g,碳酸铯1.38g,氮气置换3次,加入乙酰乙酸乙酯0.369g,3ml1,4-二氧六环,在110℃下反应32h;在三口烧瓶中直接加入3ml浓盐酸,在120℃下反应30min,将反应液旋蒸去除多余溶剂,用甲醇重结晶得到2,4,6-三氯苯丙-2-酮0.23g,纯度99%,收率68%。
在一个25mL Schlenk反应器中加入磁子,依次加入2,4,6-三氯苯丙-2-酮0.23g,乙酸钠0.164g,加入甲氧基胺盐酸盐0.167g,加入乙醇4ml和水1ml,室温下反应,待TLC原料点消失,反应结束。反应液无需纯化,水洗即可得到1-(2,4,6-三氯苯基)丙-2-酮O-甲基肟0.2612g,纯度99.5%,收率95%。
以三氯溴苯为原料,合成1-(2,4,6-三氯苯基)丙-2-酮O-甲基肟的总收率为65%。
如图1到图4所示,2,4,6-三氯苯丙-2-酮核磁数据:
核磁共振氢谱:(400MHz,Chloroform-d)δ7.36(s,2H),4.07(s,2H),2.28(s,3H).
核磁共振碳谱:(101MHz,Chloroform-d)δ202.69,136.36,133.73,130.58,128.07,45.45,29.73.
1-(2,4,6-三氯苯基)丙-2-酮O-甲基肟核磁数据:
核磁共振氢谱:(400MHz,Chloroform-d)δ7.32(d,J=9.8Hz,2H),3.95(d,J=36.5Hz,2H),3.78(d,J=2.9Hz,3H),1.70(d,J=84.0Hz,3H).
核磁共振碳谱:(101MHz,Chloroform-d)δ152.79,152.53,136.63,136.52,133.12,132.50,132.05,128.11,128.05,61.49,61.40,36.79,30.93,18.30,13.72.
实施例2:1-(2,4,6-三氯苯基)丙-2-酮O-甲基肟的合成
在一个25mlSchlenk反应瓶中加入磁子,依次加入2,4,6-三氯溴苯0.375g,碘化亚铜0.027g,2-吡啶羧酸0.035g,碳酸铯1.404g,氮气置换3次,加入乙酰乙酸乙酯0.3744g,3ml 1,4-二氧六环,在120℃下反应32h;在三口烧瓶中直接加入3ml浓盐酸,在120℃下反应30min,将反应液旋蒸掉多余溶剂,用甲醇重结晶得到2,4,6-三氯苯丙-2-酮0.236g,纯度99.3%,收率69%。
在一个25mL Schlenk反应器中加入磁子,依次加入2,4,6-三氯苯丙-2-酮0.236g,碳酸钠0.212g,加入甲氧基胺盐酸盐0.167g,加入乙醇4ml和水1ml,室温下反应,待TLC原料点消失,反应结束。反应液无需纯化,水洗即可得到1-(2,4,6-三氯苯基)丙-2-酮O-甲基肟0.253g,纯度99%,收率95%。
以三氯溴苯为原料,合成1-(2,4,6-三氯苯基)丙-2-酮O-甲基肟的总收率为66%。
实施例3:1-(2,4,6-三氯苯基)丙-2-酮O-甲基肟的合成
在带有磁力搅拌、温度计的50ml三口烧瓶中,加入2,4,6-三氯溴苯1.74g,碘化亚铜0.2559g,2-吡啶羧酸0.3304g,碳酸铯6.5g,氮气置换3次,加入乙酰乙酸乙酯1.76g,15ml1,4-二氧六环,在120℃下反应28h;在三口烧瓶中直接加入15ml浓盐酸,在120℃下反应30min,将反应液旋蒸掉多余溶剂,用甲醇重结晶得到2,4,6-三氯苯丙-2-酮1.18g,纯度98.9%,收率74%。
在一个50mL三口烧瓶中加入磁子,依次加入2,4,6-三氯苯丙-2-酮1.18g,乙酸钠0.8203g,加入甲氧基胺盐酸盐0.8352g,加入乙醇20ml和水5ml,室温下反应,待TLC原料点消失,反应结束。反应液无需纯化,水洗后用乙酸乙酯萃取,旋蒸掉溶剂即可得到1-(2,4,6-三氯苯基)丙-2-酮O-甲基肟1.279g,纯度98.7%,收率96%。
以三氯溴苯为原料,合成1-(2,4,6-三氯苯基)丙-2-酮O-甲基肟的总收率为71%。
实施例4:1-(2,4,6-三氯苯基)丙-2-酮O-甲基肟的合成
在带有磁力搅拌、温度计的100mL三口烧瓶中,加入2,4,6-三氯溴苯1.782g,碘化亚铜0.2605g,2-吡啶羧酸0.3368g,碳酸铯6.669g,氮气置换3次,加入乙酰乙酸乙酯1.78g,15ml 1,4-二氧六环,在120℃下反应28h;在三口烧瓶中直接加入15ml浓盐酸,在120℃下反应30min,将反应液旋蒸掉多余溶剂,用甲醇重结晶得到2,4,6-三氯苯丙-2-酮1.187g,纯度99.4%,收率73%。
在一个100mL三口烧瓶中加入磁子,依次加入2,4,6-三氯苯丙-2-酮1.187g,乙酸钠0.83g,加入甲氧基胺盐酸盐0.84g,加入乙醇20ml和水5ml,室温下反应,待TLC原料点消失,反应结束。反应液无需纯化水洗用乙酸乙酯萃取,旋蒸掉溶剂即可得到1-(2,4,6-三氯苯基)丙-2-酮O-甲基肟1.267g,纯度99.6%,收率95%。
以三氯溴苯为原料,合成1-(2,4,6-三氯苯基)丙-2-酮O-甲基肟的总收率为69%。
Claims (9)
1.一种1-(2,4,6-三氯苯基)丙-2-酮O-甲基肟的制备方法,其特征在于包括如下步骤:
1)以2,4,6-三氯溴苯为起始原料,加入溶剂、配体、碘化亚铜、碱和乙酰乙酸乙酯,用氮气置换三次,在60~140℃搅拌反应24~36h,反应结束后,将反应液加入盐酸,一锅法脱羧水解,重结晶得到2,4,6-三氯苯丙-2-酮;
2)2,4,6-三氯苯丙-2-酮和甲氧基胺盐酸盐在溶剂中反应得到1-(2,4,6-三氯苯基)-丙-2-酮O-甲基肟;
步骤1)中所述配体为下列之一:2-吡啶羧酸、8-羟基喹啉、N1,N2-二([1,1'-联苯]-2-基)草酰胺、N1,N2-二苯基草酰胺、2-氧代-2-(苯基氨基)乙酸;所述溶剂为下列之一:四氢呋喃、1,4-二氧六环、乙酸乙酯;所述碱为下列之一:碳酸钠、碳酸钾、磷酸钾、碳酸铯;
步骤2)中所述溶剂为下列之一:水、乙醇、甲醇、甲醇和水混合溶液、乙醇和水混合溶液。
2.如权利要求1所述的制备方法,其特征在于所述2,4,6-三氯溴苯、配体和碘化亚铜的物质的量之比为1:0.05~0.4:0.05~0.2。
3.如权利要求1所述的制备方法,其特征在于所述碱与2,4,6-三氯溴苯的物质的量之比为1~3:1。
4.如权利要求1所述的制备方法,其特征在于所述乙酰乙酸乙酯与2,4,6-三氯溴苯的物质的量之比为1~3:1。
5.如权利要求1所述的制备方法,其特征在于所述反应温度为100~140℃,反应时间为24~28h。
6.如权利要求1所述的制备方法,其特征在于所述步骤1)中溶剂与2,4,6-三氯溴苯质量比为5~10:1。
7.如权利要求1所述的制备方法,其特征在于所述步骤2)中溶剂为乙醇和水的混合溶剂。
8.如权利要求1所述的制备方法,其特征在于步骤1)中2,4,6-三氯溴苯、配体和碘化亚铜的物质的量之比为1:0.2:0.1,乙酰乙酸乙酯与2,4,6-三氯溴苯的物质的量之比为2~3:1,碱与2,4,6-三氯溴苯的物质的量之比为2~3:1,反应温度为120℃,反应时间为28h;步骤2)中溶剂乙醇和水的混合溶剂的体积比为乙醇:水=4:1。
9.如权利要求1所述的制备方法,其特征在于步骤1)中反应液用甲醇重结晶直接得到2,4,6-三氯苯丙-2-酮。
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