WO2021238839A1 - 一种(4-异丙氧基-2-甲基)苯基异丙基酮的制备方法 - Google Patents

一种(4-异丙氧基-2-甲基)苯基异丙基酮的制备方法 Download PDF

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WO2021238839A1
WO2021238839A1 PCT/CN2021/095446 CN2021095446W WO2021238839A1 WO 2021238839 A1 WO2021238839 A1 WO 2021238839A1 CN 2021095446 W CN2021095446 W CN 2021095446W WO 2021238839 A1 WO2021238839 A1 WO 2021238839A1
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isopropoxy
methyl
product
phenylisopropyl
reaction
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PCT/CN2021/095446
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English (en)
French (fr)
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刘伟
吴少祥
高瑞
王瑞
王文军
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安道麦马克西姆有限公司
刘伟
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Priority to IL298598A priority Critical patent/IL298598A/en
Priority to US17/928,018 priority patent/US20230212101A1/en
Priority to BR112022024231A priority patent/BR112022024231A2/pt
Priority to EP21814338.6A priority patent/EP4159713A4/en
Priority to KR1020227045831A priority patent/KR20230019141A/ko
Priority to JP2022573261A priority patent/JP2023527071A/ja
Publication of WO2021238839A1 publication Critical patent/WO2021238839A1/zh

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    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C253/00Preparation of carboxylic acid nitriles
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C253/00Preparation of carboxylic acid nitriles
    • C07C253/30Preparation of carboxylic acid nitriles by reactions not involving the formation of cyano groups
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C45/00Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
    • C07C45/004Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by reaction with organometalhalides
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C255/00Carboxylic acid nitriles
    • C07C255/49Carboxylic acid nitriles having cyano groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton
    • C07C255/53Carboxylic acid nitriles having cyano groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton containing cyano groups and hydroxy groups bound to the carbon skeleton
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C255/00Carboxylic acid nitriles
    • C07C255/49Carboxylic acid nitriles having cyano groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton
    • C07C255/54Carboxylic acid nitriles having cyano groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton containing cyano groups and etherified hydroxy groups bound to the carbon skeleton
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07CACYCLIC OR CARBOCYCLIC COMPOUNDS
    • C07C49/00Ketones; Ketenes; Dimeric ketenes; Ketonic chelates
    • C07C49/76Ketones containing a keto group bound to a six-membered aromatic ring
    • C07C49/84Ketones containing a keto group bound to a six-membered aromatic ring containing ether groups, groups, groups, or groups
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/50Improvements relating to the production of bulk chemicals
    • Y02P20/584Recycling of catalysts

Definitions

  • the invention belongs to the field of organic chemistry, and specifically relates to a preparation method of (4-isopropoxy-2-methyl)phenylisopropyl ketone.
  • the target compound (4-isopropoxy-2-methyl) phenylisopropyl ketone is an intermediate of the fungicide isofetamid.
  • Isofetamid is the latest succinate dehydrogenase inhibitor (SDHI) broad-spectrum fungicide developed by Ishihara. It has both protective, systemic and therapeutic effects. It can adversely affect the respiration of plants and fungi. It is used to control foliage and soil. It is used to prevent and control various diseases caused by Botrytis and Sclerotinia on grapes, lettuce, rapeseed, dwarf berries and turf.
  • WO2006016708 discloses a chemical synthesis method of intermediate formula (V) (4-hydroxy-2-methyl)phenylisopropyl ketone, and the reaction process is as follows:
  • the method uses the formula (I) m-cresol and isobutyryl chloride as raw materials, aluminum trichloride as a catalyst, and carbon disulfide as a solvent.
  • the intermediate formula (V) is obtained through post-treatment.
  • the intermediate formula (V) can be reacted with haloisopropane to obtain the product formula (IV).
  • the selectivity of the reaction is very poor, the yield is low, and the reaction will produce a large amount of acidic wastewater, which is not environmentally friendly.
  • the pure product of formula (V) is obtained by column chromatography, which is not conducive to industrialization. Production.
  • formula (V) is synthesized through Friedel-Crafts acylation reaction, and then formula (IV) is synthesized through etherification.
  • problems of low yield, large amount of three wastes, and high cost There are problems of low yield, large amount of three wastes, and high cost.
  • the development is suitable for industrial applications, simple, A new synthesis method that is low-cost, high-yield, and environmentally friendly, so as to overcome the shortcomings of the prior art, will be very desirable.
  • the present invention provides a simple, effective, easy-to-operate, and environment-friendly preparation method of (4-isopropoxy-2-methyl)phenylisopropyl ketone.
  • the purity of (4-isopropoxy-2-methyl)phenylisopropyl ketone prepared by the method described in this application is more than 99%, and the yield based on m-cresol is more than 79%.
  • a preparation method of (4-isopropoxy-2-methyl) phenyl isopropyl ketone includes the following steps:
  • the catalyst is one or more of fuming sulfuric acid, methanesulfonyl chloride, chlorosulfonic acid or sulfonyl chloride.
  • the catalyst is attached to the silica or alumina carrier to form a solid catalyst that can be recycled and reused.
  • the catalyst is silica-supported chlorosulfonic acid or silica-supported sulfonyl chloride.
  • the thiocyanate is one or more of KSCN, NaSCN, and NH 4 SCN.
  • thiocyanate is KSCN.
  • step (1) the reaction temperature is 50-120° C., and the reaction time is 8-16 h.
  • the alkali is one or more of potassium carbonate, sodium carbonate, potassium bicarbonate, sodium bicarbonate, potassium hydroxide or sodium hydroxide.
  • the base is potassium carbonate.
  • the catalyst is pyridine, 4-dimethylaminopyridine, DABCO (chemical name: 1,4-diazabicyclo[2.2.2]octane; alias: triethylenediamine , Triethylenediamine, English name: 1,4-Diazabicyclo[2.2.2]octane; triethylenediamine), Me-DABCO (chemical name: 2-methyl-1,4-diazabicyclo[2.2.2 ] Octane) or one or more of tetramethylammonium hydroxide.
  • DABCO chemical name: 1,4-diazabicyclo[2.2.2]octane
  • Triethylenediamine Triethylenediamine
  • English name 1,4-Diazabicyclo[2.2.2]octane
  • Me-DABCO chemical name: 2-methyl-1,4-diazabicyclo[2.2.2 ] Octane
  • the catalyst is tetramethylammonium hydroxide.
  • the halogenated isopropane is one or more of chloroisopropane, bromoisopropane, or iodoisopropane.
  • halogenated isopropane is chloroisopropane.
  • step (2) the reaction temperature is 25-80°C, and the reaction time is 1-10 hours.
  • the isopropyl magnesium halide is one or more of isopropyl magnesium chloride, isopropyl magnesium bromide or isopropyl magnesium iodide.
  • isopropyl magnesium halide is isopropyl magnesium chloride.
  • reaction temperature of the product B and isopropyl magnesium halide is 45-70°C, and the reaction time is 1-5 hours.
  • step (3) the specific operation of the acidification is: adding dropwise the reaction mixture with a temperature of 15-40° C. to 5-36% hydrochloric acid and stirring for 30-90 min.
  • step (3) the heating temperature is 80-150°C; the temperature of the vacuum distillation is 134-138°C, and the pressure is 1-5 Torr.
  • the preparation method of (4-isopropoxy-2-methyl) phenyl isopropyl ketone of the present invention specifically includes: reacting m-cresol and thiocyanate under the action of a catalyst, filtering to obtain a filtrate and recovering Catalyst, the filtrate is concentrated and crystallized to obtain product A; the product A and haloisopropane are reacted under the action of alkali and catalyst, and the filtrate is obtained after filtration, and the filtrate is concentrated to obtain product B; B is reacted with isopropyl magnesium halide to obtain a reaction mixture; the reaction mixture is acidified and left to stand for layering to obtain an organic phase; the organic phase is desolvated to obtain a concentrate, and the concentrate is reduced Pressure distillation to obtain the (4-isopropoxy-2-methyl)phenylisopropyl ketone.
  • the purity of (4-isopropoxy-2-methyl)phenylisopropyl ketone prepared by the method described in this application is more than
  • the invention uses meta-cresol and thiocyanate to introduce the cyano group of product A under the action of a catalyst, avoids the use of toxic reagents such as CuCN, KCN or NaCN, reduces the reaction temperature, and is simple to operate.
  • the present invention utilizes the reaction of product B with isopropyl magnesium halide, that is, the introduction of isopropyl group through the reaction of Grignard reagent and cyano group, instead of the conventional Friedel-Crafts acylation reaction method ,
  • the entire reaction process effectively avoids a large amount of acidic wastewater, improves the reaction yield, and reduces a series of environmental impacts caused by post-treatment;
  • the present invention is simpler in operation and high in yield than the existing Friedel-Crafts acylation route. There is less waste water, which is more suitable for industrial production.
  • This embodiment provides a method for preparing (4-isopropoxy-2-methyl)phenylisopropyl ketone:
  • This embodiment provides a method for preparing (4-isopropoxy-2-methyl)phenylisopropyl ketone:
  • This embodiment provides a method for preparing (4-isopropoxy-2-methyl)phenylisopropyl ketone:
  • This embodiment provides a method for preparing (4-isopropoxy-2-methyl)phenylisopropyl ketone:
  • this application uses meta-cresol and thiocyanate to introduce the cyano group of product A under the action of a catalyst, avoiding the use of toxic reagents such as CuCN, KCN or NaCN, lowering the reaction temperature, simple operation, and After the catalyst is washed with solvent, it can be recycled and reused, which reduces the cost; the product B is used to react with isopropyl magnesium halide, that is, the isopropyl group is introduced through the reaction of Grignard reagent and cyano group, instead of the conventional Friedel-Crafts acylation reaction Method, the entire reaction process effectively avoids a large amount of acidic wastewater, improves the reaction yield, and reduces a series of environmental impacts caused by post-treatment; compared with the existing Friedel-Crafts acylation route, the operation is simple, the yield is high, and the wastewater It produces less and is more suitable for industrial production.
  • toxic reagents such as CuCN, KCN or NaCN

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
  • Catalysts (AREA)

Abstract

公开了一种(4-异丙氧基-2-甲基)苯基异丙基酮的制备方法,包括:将间甲酚与硫氰酸盐在催化剂作用下反应,得到产物A;将所述产物A和卤代异丙烷在碱、催化剂作用下反应,得到产物B;将所述产物B与异丙基卤化镁反应,经处理后得到所述(4-异丙氧基-2-甲基)苯基异丙基酮。经过以上步骤制备得到的(4-异丙氧基-2-甲基)苯基异丙基酮纯度为99%以上,总收率为79%以上。所述方法避免了有毒试剂的使用以及大量酸性废水的产生,降低了反应温度,提高了反应收率,工艺路线简单高效且降低成本,所得产品纯度高。所述方法大幅度提升了生产安全性,易于工业化推广。

Description

一种(4-异丙氧基-2-甲基)苯基异丙基酮的制备方法 技术领域
本发明属于有机化学领域,具体涉及一种(4-异丙氧基-2-甲基)苯基异丙基酮的制备方法。
背景技术
目标化合物(4-异丙氧基-2-甲基)苯基异丙基酮(式Ⅳ)是杀菌剂isofetamid的中间体。Isofetamid是石原开发的最新的琥珀酸脱氢酶抑制剂(SDHI)类广谱杀菌剂,兼具保护、内吸和治疗作用,可对植物及真菌呼吸产生不利影响,用于防治叶面和土传病害,用于防治葡萄、生菜、油菜、矮生浆果和草皮等作物上由葡萄孢菌和核盘菌引起的各种病害。
Figure PCTCN2021095446-appb-000001
WO2006016708公开了中间体式(Ⅴ)(4-羟基-2-甲基)苯基异丙基酮的化学合成方法,反应过程如下所示:
Figure PCTCN2021095446-appb-000002
该方法以式(Ⅰ)间甲酚和异丁酰氯为原料、三氯化铝作为催化剂、二硫化碳为溶剂,混合反应后,经后处理得到中间体式(Ⅴ)。中间体式(Ⅴ)可与卤代异丙烷反应,得到产品式(Ⅳ)。在合成中间体式(Ⅴ)的过程中,反应的选择性很差,收率低,且反应会产生大量的酸性废水,环境不友好,经柱层析得到式(Ⅴ)纯品,不利于工业化生产。
鉴于现有技术,经过傅克酰基化反应合成式(Ⅴ),然后再经醚化合成式(Ⅳ),存在收率低,三废量大,成本高的问题,开发适合于工业应用,简单、 低成本、高收率并且环境友好,从而克服现有技术的缺陷的全新合成方法将会是非常合乎需要的。
发明内容
为了解决现有技术存在的上述问题,本发明提供了一种简单有效、易于操作、环境友好的(4-异丙氧基-2-甲基)苯基异丙基酮的制备方法。经过本申请所述方法制备得到的(4-异丙氧基-2-甲基)苯基异丙基酮纯度为99%以上,以间甲酚计收率为79%以上。
本发明所采用的技术方案为:
一种(4-异丙氧基-2-甲基)苯基异丙基酮的制备方法,包括如下步骤:
(1)将间甲酚和硫氰酸盐在催化剂作用下反应,过滤后得滤液并回收催化剂,将所述滤液进行浓缩结晶得到产物A;
(2)将所述产物A和卤代异丙烷在碱和催化剂作用下反应,过滤后得滤液,将所述滤液进行浓缩得到产物B;
(3)将所述产物B与异丙基卤化镁反应,得到反应混合物;将所述反应混合物经酸化、静置分层后得到有机相;将所述有机相依次进行加热、减压蒸馏,得到所述(4-异丙氧基-2-甲基)苯基异丙基酮。
进一步的,步骤(1)中,所述催化剂为发烟硫酸、甲磺酰氯、氯磺酸或磺酰氯中的一种或几种。
进一步的,所述催化剂附着于二氧化硅或三氧化铝载体上形成可回收循环使用的固态催化剂。
进一步的,所述催化剂为二氧化硅负载的氯磺酸或二氧化硅负载的磺酰氯。
进一步的,步骤(1)中,所述硫氰酸盐为KSCN、NaSCN、NH 4SCN中的一种或多种。
进一步的,所述硫氰酸盐为KSCN。
进一步的,步骤(1)中,所述反应温度为50-120℃,所述反应时间为8-16h。
进一步的,步骤(2)中,所述碱为碳酸钾、碳酸钠、碳酸氢钾、碳酸氢钠、氢氧化钾或氢氧化钠中的一种或多种。
进一步的,所述碱为碳酸钾。
进一步的,步骤(2)中,所述催化剂为吡啶、4-二甲氨基吡啶、DABCO(化学名称:1,4-二氮杂二环[2.2.2]辛烷;别名:三乙烯二胺、三亚乙基二胺,英文名称:1,4-Diazabicyclo[2.2.2]octane;triethylenediamine)、Me-DABCO(化学名称:2-甲基-1,4-二氮杂二环[2.2.2]辛烷)或四甲基氢氧化铵中的一种或多种。
进一步的,所述催化剂为四甲基氢氧化铵。
进一步的,步骤(2)中,所述卤代异丙烷为氯代异丙烷、溴代异丙烷或碘代异丙烷中的一种或多种。
进一步的,所述卤代异丙烷为氯代异丙烷。
进一步的,步骤(2)中,所述反应温度为25-80℃,所述反应时间为1-10小时。
进一步的,步骤(3)中,所述异丙基卤化镁为异丙基氯化镁、异丙基溴化镁或异丙基碘化镁中的一种或多种。
进一步的,异丙基卤化镁为异丙基氯化镁。
进一步的,所述产物B与异丙基卤化镁反应的温度为45-70℃,所述反应时间为1-5小时。
进一步的,步骤(3)中,所述酸化的具体操作为:将温度为15-40℃的反应混合物滴加至5-36%盐酸中搅拌30-90min。
进一步的,步骤(3)中,所述加热温度为80-150℃;所述减压蒸馏的温度为134-138℃,压力为1-5Torr。
以下是本发明制备方法中涉及到的化合物结构:
Figure PCTCN2021095446-appb-000003
本发明的有益效果为:
本发明所述(4-异丙氧基-2-甲基)苯基异丙基酮的制备方法具体包括:将间甲酚和硫氰酸盐在催化剂作用下反应,过滤后得滤液并回收催化剂,将所述滤液进行浓缩结晶得到产物A;将所述产物A和卤代异丙烷在碱、催化剂作用下反应,过滤后得滤液,将所述滤液进行浓缩得到产物B;将所述产物B与异丙基卤化镁反应,得到反应混合物;将所述反应混合物经酸化、静置分层后得到有机相;将所述有机相进行脱溶后得到浓缩物,将所述浓缩物进行减压蒸馏,得到所述(4-异丙氧基-2-甲基)苯基异丙基酮。经过本申请所述方法制备得到的(4-异丙氧基-2-甲基)苯基异丙基酮纯度为99%以上,以间甲酚计收率为79%以上。
本发明利用间甲酚与硫氰酸盐在催化剂作用下,引入产物A的氰基基团,避免了有毒试剂如CuCN、KCN或NaCN的使用,降低了反应温度,操作简单,且催化剂经溶剂洗涤处理后,可以回收重新利用,降低了成本;本发明利用产物B与异丙基卤化镁反应,即通过格氏试剂与氰基反应引入异丙酰基,代替了常规的傅克酰基化反应方法,整个反应过程有效的避免了大量酸性废水,提高了反应收率,减少了后处理对环境带来的一系列影响;本发明相对现有的傅克酰基化路线,操作简单,收率高,废水产生少,更适合工业化生产。
具体实施方式
为使本发明的目的、技术方案和优点更加清楚,下面将对本发明的技术方案进行详细的描述。显然,所描述的实施例仅仅是本发明的一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动的前提下所得到的所有其它实施方式,都属于本发明所保护的范围。
实施例中涉及到的化学物结构式如下:
Figure PCTCN2021095446-appb-000004
实施例1
本实施例提供一种(4-异丙氧基-2-甲基)苯基异丙基酮的制备方法:
(1)在配有冷凝器的烧瓶中,依次投入间甲酚(式I)109g、硫氰酸钾98g、二氧化硅负载的氯磺酸314g,开启搅拌,升温至50℃,并保温搅拌16小时。反应结束后,加入甲苯110g,降温至30℃,过滤,滤液脱溶回收甲苯,浓缩物加入正丁醚132g,升温至全溶,降温至0℃,过滤、烘干,得到113g产物A(式II),纯度99.0%,收率84.0%;
(2)在配有冷凝器的烧瓶中,依次投入甲苯300g、碳酸钾63g、产物A100.8g、四甲基氢氧化铵0.15g,控温50-55℃,滴加氯代异丙烷64.5g,滴加完毕,控温25℃搅拌反应10小时,反应完毕,过滤,滤液脱溶回收甲苯,得到产物B(式III)的浓缩物133.8g,含量97.1%,收率98.9%;
(3)在配有冷凝器的烧瓶中,依次投入产物B 89.4g、四氢呋喃90g,控温50-55℃,缓慢加入异丙基氯化镁的四氢呋喃溶液107g,滴加完毕,控温45℃搅拌反应5小时。反应结束后,控温15℃,将反应混合物滴加至20%盐酸中,搅拌90min,静置分层,将所述有机相加热至80℃回收四氢呋喃,浓缩物加热至140℃,在1Torr压力下,收集134℃馏分,得到本发明所述产品(式IV)105.7g,纯度99.0%,收率95.0%。
实施例2
本实施例提供一种(4-异丙氧基-2-甲基)苯基异丙基酮的制备方法:
(1)在配有冷凝器的烧瓶中,依次投入间甲酚(式I)109g、硫氰酸钾98g、实施例1回收所得催化剂,开启搅拌,升温至120℃,并保温搅拌8小时。反应结束后,加入甲苯110g,降温至30℃,过滤,滤液脱溶回收甲苯,浓缩物加 入正丁醚132g,升温至全溶,降温至0℃,过滤、烘干,得到122.4g产物A(式Ⅱ),纯度99.0%,收率83.6%;
(2)在配有冷凝器的烧瓶中,依次投入甲苯300g、碳酸钠80.3g、产物A100.8g、4-二甲氨基吡啶0.35g,控温50-55℃,滴加溴代异丙烷64.5g,滴加完毕,控温80℃搅拌反应1小时,反应完毕,过滤,滤液脱溶回收甲苯,得到产物B(式Ⅲ)浓缩物132.3g,含量96.8%,收率97.5%;
(3)在配有冷凝器的烧瓶中,依次投入产物B 89.4g、四氢呋喃90g,控温50-55℃,缓慢加入异丙基溴化镁的四氢呋喃溶液181g,滴加完毕,控温70℃搅拌反应1小时。反应结束后,控温40℃,将反应混合物滴加至30%盐酸中,搅拌30min,静置分层,将有机相加热至80℃回收四氢呋喃,浓缩物加热至150℃,在5Torr压力下,收集138℃馏分,得到本申请所述产品(式Ⅳ)106.0g,纯度99.2%,收率95.5%。
实施例3
本实施例提供一种(4-异丙氧基-2-甲基)苯基异丙基酮的制备方法:
(1)在配有冷凝器的烧瓶中,依次投入间甲酚(式I)109g、硫氰酸钾98g、二氧化硅负载的磺酰氯370g,开启搅拌,升温至97.5℃,并保温搅拌12小时。反应结束后,加入甲苯110g,降温至30℃,过滤,滤液脱溶回收甲苯,浓缩物加入正丁醚132g,升温至全溶,降温至0℃,过滤、烘干,得到113.2g产物A(式Ⅱ),纯度99.0%,收率84.2%;
(2)在配有冷凝器的烧瓶中,依次投入甲苯300g、碳酸氢钾63g、产物A 100.8g、DABCO 0.42g,控温50-55℃,滴加2-氯丙烷64.5g,滴加完毕,控温62℃搅拌反应3小时,反应完毕,过滤,滤液脱溶回收甲苯,得到产物B(式Ⅲ)浓缩物132.2g,含量94.5%,收率95.0%;
(3)在配有冷凝器的烧瓶中,依次投入产物B 89.4g、四氢呋喃90g,控温50-55℃,缓慢加入异丙基溴化镁的四氢呋喃溶液181g,滴加完毕,控温58℃搅拌反应3小时。反应结束后,控温27.5℃,将反应混合物滴加至36%盐酸中, 搅拌60min,静置分层,将有机相脱加热至80℃回收四氢呋喃,浓缩物加热至145℃,在3Torr压力下,收集136℃馏分,得到本申请所述产品(式Ⅳ)106.0g,纯度99.2%,收率95.5%。
实施例4
本实施例提供一种(4-异丙氧基-2-甲基)苯基异丙基酮的制备方法:
(1)在配有冷凝器的烧瓶中,依次投入间甲酚(式Ⅰ)109g、硫氰酸氨152.2g催化剂(二氧化硅负载的氯磺酸)314g,开启搅拌,升温至97.5℃,并保温搅拌12小时。反应结束后,加入甲苯110g,降温至30℃,过滤,滤液脱溶回收甲苯,浓缩物加入正丁醚132g,升温至全溶,降温至0℃,过滤、烘干,得到110.8g产物A(式Ⅱ),纯度98.0%,收率81.5%;
(2)在配有冷凝器的烧瓶中,依次投入甲苯300g、氢氧化钠63g、产物A 100.8g、Me-DABCO 0.42g,控温50-55℃,滴加碘代异丙烷64.5g,滴加完毕,控温62℃搅拌反应3小时,反应完毕,过滤,滤液脱溶回收甲苯,得到产物B(式Ⅲ)浓缩物132.1g,含量94.5%,收率95.0%;
(3)在配有冷凝器的烧瓶中,依次投入产物B 89.4g(0.5mol)、四氢呋喃90g,控温50-55℃,缓慢加入异丙基氯化镁的四氢呋喃溶液107g(0.52mol),滴加完毕,控温55℃搅拌反应4小时。反应结束后,控温25℃,将反应混合物滴加至10%盐酸中,搅拌60min,静置分层,将有机相加热至80℃回收四氢呋喃,浓缩物加热至147℃,在4Torr压力下,收集137℃馏分,得到本申请所述产品(式Ⅳ)105.7g,纯度99.0%,收率95.0%。
对比例
利用现有技术合成目标化合物(4-异丙氧基-2-甲基)苯基异丙基酮,步骤如下:
(1)在配有冷凝器的烧瓶中,依次投入间甲酚(式Ⅰ)109g、无水三氯化铝161.5g、800g二氯甲烷,控温0-5℃,缓慢加入异丁酰氯117.6g,滴加完毕, 控温0-5℃搅拌反应10小时。反应结束后,将反应液缓慢倒入1000g冰水中,搅拌0.5小时,静置分层,有机相脱溶回收二氯甲烷,浓缩物经减压蒸馏,得到中间体(式Ⅴ)104.2g亮黄色油状物,纯度99.0%,收率58.0%。
(2)在配有冷凝器的烧瓶中,依次投入中间体(式Ⅴ)56.9g、氢氧化钾26.9g、200g乙醇,控温60-65℃,缓慢滴加2-溴丙烷101g,滴加完毕,控温在60-65℃搅拌反应8小时。反应结束后,蒸馏回收乙醇,浓缩物加入100g二氯甲烷、50g水,搅拌0.5小时,静置分层,有机相脱溶回收二氯甲烷,浓缩物经减压蒸馏,得到目标产物(式Ⅳ)60.5g,纯度99.0%,收率86.0%,以间甲酚计总收率为50%。
对比实施例1-4和对比例合成目标产物的过程,可以得出对比例合成中间体的过程中,反应的选择性很差,收率低,且反应会产生大量的酸性废水,环境不友好;且中间体再经醚化合成目标产物收率低、三废量大、成本高,且以间甲酚计总收率仅为50%。而本申请实施例1-4所述技术方案制备得到的(4-异丙氧基-2-甲基)苯基异丙基酮纯度为99%以上,以间甲酚计总收率为79%以上,本申请利用间甲酚与硫氰酸盐在催化剂作用下,引入产物A的氰基基团,避免了有毒试剂如CuCN、KCN或NaCN的使用,降低了反应温度,操作简单,且催化剂经溶剂洗涤处理后,可以回收重新利用,降低了成本;利用产物B与异丙基卤化镁反应,即通过格氏试剂与氰基反应引入异丙酰基,代替了常规的傅克酰基化反应方法,整个反应过程有效的避免了大量酸性废水,提高了反应收率,减少了后处理对环境带来的一系列影响;相对现有的傅克酰基化路线,操作简单,收率高,废水产生少,更适合工业化生产。
以上所述,仅为本发明的具体实施方式,但本发明的保护范围并不局限于此,任何熟悉本技术领域的技术人员在本发明揭露的技术范围内,可轻易想到变化或替换,都应涵盖在本发明的保护范围之内。因此,本发明的保护范围应以所述权利要求的保护范围为准。

Claims (10)

  1. 一种(4-异丙氧基-2-甲基)苯基异丙基酮的制备方法,其特征在于,包括如下步骤:
    (1)将间甲酚和硫氰酸盐在催化剂作用下反应,过滤后得滤液并回收催化剂,将所述滤液进行浓缩结晶得到产物A;
    (2)将所述产物A和卤代异丙烷在碱和催化剂作用下反应,过滤后得滤液,将所述滤液进行浓缩得到产物B;
    (3)将所述产物B与异丙基卤化镁反应,得到反应混合物;将所述反应混合物经酸化、静置分层后得到有机相;将所述有机相依次进行加热、减压蒸馏,得到所述(4-异丙氧基-2-甲基)苯基异丙基酮。
  2. 根据权利要求1所述的(4-异丙氧基-2-甲基)苯基异丙基酮的制备方法,其特征在于,步骤(1)中,所述催化剂为发烟硫酸、甲磺酰氯、氯磺酸或磺酰氯中的一种或几种。
  3. 根据权利要求2所述的(4-异丙氧基-2-甲基)苯基异丙基酮的制备方法,其特征在于,所述催化剂附着于二氧化硅或三氧化铝载体上形成可回收循环使用的固态催化剂。
  4. 根据权利要求1所述的(4-异丙氧基-2-甲基)苯基异丙基酮的制备方法,其特征在于,步骤(1)中,所述硫氰酸盐为KSCN、NaSCN、NH 4SCN中的一种或多种;所述反应温度为50-120℃,所述反应时间为8-16h。
  5. 根据权利要求1所述的(4-异丙氧基-2-甲基)苯基异丙基酮的制备方法,其特征在于,步骤(2)中,所述碱为碳酸钾、碳酸钠、碳酸氢钾、碳酸氢钠、氢氧化钾或氢氧化钠中的一种或多种。
  6. 根据权利要求1所述的(4-异丙氧基-2-甲基)苯基异丙基酮的制备方法,其特征在于,步骤(2)中,所述催化剂为吡啶、4-二甲氨基吡啶、DABCO、Me-DABCO或四甲基氢氧化铵中的一种或多种。
  7. 根据权利要求1所述的(4-异丙氧基-2-甲基)苯基异丙基酮的制备方法,其特征在于,步骤(2)中,所述卤代异丙烷为氯代异丙烷、溴代异丙烷或碘代异丙烷中的一种或多种;所述反应温度为25-80℃,所述反应时间为1-10小时。
  8. 根据权利要求1所述的(4-异丙氧基-2-甲基)苯基异丙基酮的制备方法,其特征在于,步骤(3)中,所述异丙基卤化镁为异丙基氯化镁、异丙基溴化镁或异丙基碘化镁中的一种或多种;所述产物B与异丙基卤化镁反应的温度为45-70℃,所述反应时间为1-5小时。
  9. 根据权利要求1所述的(4-异丙氧基-2-甲基)苯基异丙基酮的制备方法,其特征在于,步骤(3)中,所述酸化的具体操作为:将温度为15-40℃的反应混合物滴加至5-36%盐酸中搅拌30-90min。
  10. 根据权利要求1所述的(4-异丙氧基-2-甲基)苯基异丙基酮的制备方法,其特征在于,步骤(3)中,所述加热温度为80-150℃;所述减压蒸馏的温度为134-138℃,压力为1-5Torr。
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