CN111187216A - 一种连续法合成咪唑乙醇的方法 - Google Patents
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- 238000000034 method Methods 0.000 title claims abstract description 24
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- WVDDGKGOMKODPV-UHFFFAOYSA-N hydroxymethyl benzene Natural products OCC1=CC=CC=C1 WVDDGKGOMKODPV-UHFFFAOYSA-N 0.000 claims abstract description 36
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 claims abstract description 30
- 238000005406 washing Methods 0.000 claims abstract description 25
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- OAMHTTBNEJBIKA-UHFFFAOYSA-N 2,2,2-trichloro-1-phenylethanone Chemical compound ClC(Cl)(Cl)C(=O)C1=CC=CC=C1 OAMHTTBNEJBIKA-UHFFFAOYSA-N 0.000 claims description 4
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- ZRMLHFOKDLDAIB-UHFFFAOYSA-N 2-(2,4-dichlorophenyl)oxirane Chemical compound ClC1=CC(Cl)=CC=C1C1OC1 ZRMLHFOKDLDAIB-UHFFFAOYSA-N 0.000 description 1
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Abstract
本发明公开了一种连续法合成咪唑乙醇的方法,属合成咪唑乙醇的方法。以2,2',4'‑三氯苯乙酮和异丙醇为反应物,异丙醇铝作催化剂,三氟乙酸作助剂,进行还原反应,经过蒸馏、酸化,甲苯作溶剂进行水洗,得到2,4‑二氯‑α‑氯甲基苯甲醇和甲苯的混合液。2,4‑二氯‑α‑氯甲基苯甲醇和甲苯的混合液与咪唑在碳酸钠作催化剂、离子液体[bmim]PF6作相转移催化剂的条件下经过N‑烷基化反应、重结晶而得咪唑乙醇。该工艺反应时间短,使用仪器和溶剂少,免除中间产物固化和溶解过程,实现“一锅出”,能耗低,步骤简化,适合工业生产。
Description
技术领域
本发明涉及咪唑乙醇的制备方法,具体是一种连续法合成咪唑乙醇的方法。
背景技术
咪唑乙醇,化学名1-(2,4-二氯苯基)-2-(1-咪唑基)-乙醇,是合成咪康唑、益康唑等的重要中间体,用于抗真菌药物和水果保鲜剂等咪唑类抗真菌药物的中间体。
目前它的合成方法主要有:多数人用氢化铝锂、硼氢化钠、硼氢化钾、异丙醇铝等作还原剂,甲醇、乙醇、异丙醇等作还原反应溶剂,TEBA、TBAB、PEG、BuN+Br-等作相转移催化剂,THF、DMF、甲苯等作N烷基化溶剂,先进行还原反应后再进行N-烷基化反应,或先进行N-烷基化反应后再进行还原反应制备咪唑乙醇,不同程度存在收率较低,不易操作,中间产物2,4-二氯-α-氯甲基苯甲醇用石油醚或乙醚萃取需要提纯,需要冷水降温析出结块或干燥,同时进行N-烷基化反应时需要将还原物碾碎,如果不碾碎易碰到温度计上而使温度计损坏,影响反应,浪费能源,三废多等因素。王宇等(咪康唑中间体1-(2,4-二氯苯基)-2-(1-咪唑基)乙醇合成新工艺)以2,4-二氯苯甲醛为原料经环氧化生成1-(2,4-二氯苯基)环氧乙烷后,再用咪唑使环氧乙烷开环得到。该工艺收率低,甲醇钠具有腐蚀性、对氧气敏感,易燃,易爆,极易吸潮。由于2,4-二氯-α-氯甲基苯甲醇熔点为50℃左右,温度低于50℃时就会变成固体,需要用热水水洗,浪费了能源,同时由于2,4-二氯-α-氯甲基苯甲醇密度比水大,水洗时在下层,需要把2,4-二氯-α-氯甲基苯甲醇放下来在进行后续水洗步骤,转移时也会造成物料损失,增加劳动量,操作极其不方便,增加了生产成本。水洗后2,4-二氯-α-氯甲基苯甲醇温度为60 ℃以上,固化需要很长一段时间,固化后成块状,2,4-二氯-α-氯甲基苯甲醇里面会含有少量水分,在进行N-烷基化反应之前需要把块状结晶敲打成小块,以方便投料,浪费了人力,在操作过程中会有物料损失,成本增加。由于2,4-二氯-α-氯甲基苯甲醇为块状结晶,进行N-烷基化反应时,溶解需要一定的时间,这无疑延长了反应时间,块状2,4-二氯-α-氯甲基苯甲醇加料不方便,开始反应时易触碰温度计而使温度计损坏,增大成本。N-烷基化反应时间长,后处理采取降温方式,降温缓慢,浪费能源,而用盐酸酸化则三废多。
发明内容
本发明的目的在于提供一种连续法合成咪唑乙醇的方法,以克服现有制备方法的不足。
本发明的技术方案如下:一种连续法合成咪唑乙醇的方法,以2,2',4'-三氯苯乙酮和异丙醇为反应物,异丙醇铝作催化剂,三氟乙酸做助剂,进行还原反应,再以碳酸钠作催化剂和离子液体[bmim]PF6作相转移催化剂,进行N-烷基化,得到咪唑乙醇。
作为本发明所述的一种连续法合成咪唑乙醇的方法的优选方案:按如下步骤制备:
在备有磁力搅拌、温度计、球型冷凝管的三口圆底烧瓶中加入异丙醇、异丙醇铝及2,2',4'-三氯苯乙酮,搅拌下加入三氟乙酸,进行加热,反应转速控制在500~600 r/min;在67~69 ℃反应2~3 h;在真空度-0.08~0.1 MPa,温度67~69 ℃减压蒸馏;加入质量浓度为15 %的稀硝酸,搅拌中和异丙醇铝,加入甲苯Ⅰ,静置后分去下层,上层用常温水洗至中性,静置后分去下层水层,得2,4-二氯-α-氯甲基苯甲醇和甲苯的混合液;
向上述2,4-二氯-α-氯甲基苯甲醇和甲苯的混合液中加入咪唑、碳酸钠、A1203、[bmim]PF6、甲苯Ⅱ,控制温度67~69 ℃反应2.5~3 h,过滤,滤饼用水进行水洗,滤液用67~69℃水,水洗至近中性,加入活性炭,67~69 ℃保温15分钟,热滤,减压蒸馏回收甲苯,滤液降温至0 ℃,过滤,得到咪唑乙醇。
作为本发明所述的一种连续法合成咪唑乙醇的方法的优选方案:所述异丙醇铝的用量为2,2',4'-三氯苯乙酮质量的33~40 %;
所述异丙醇的用量为2,2',4'-三氯苯乙酮质量的3~3.7倍;
所述三氟乙酸的用量为2,2',4'-三氯苯乙酮质量的3.3~4.7 %;
所述甲苯Ⅰ的用量为2,2',4'-三氯苯乙酮质量的2.6~3.4倍;
所述咪唑的用量为2,2',4'-三氯苯乙酮质量的26~30 %;
所述碳酸钠的用量为2,2',4'-三氯苯乙酮质量的56~64 %;
所述A1203的用量为2,2',4'-三氯苯乙酮质量的73~87 %;
所述[bmim]PF6的用量为2,2',4'-三氯苯乙酮质量的6.6~13.4 %;
所述甲苯Ⅱ的用量为2,2',4'-三氯苯乙酮质量的33~67 %;
所述活性炭的用量为2,2',4'-三氯苯乙酮质量的1.6~3.4 %。
作为本发明所述的一种连续法合成咪唑乙醇的方法的优选方案:所述15 %的稀硝酸为质量浓度,配制15 %稀硝酸使用质量浓度65 %硝酸与水的质量比为1:2.8。
作为本发明所述的一种连续法合成咪唑乙醇的方法的优选方案:所述减压蒸馏回收甲苯中,是指减压蒸馏回收的甲苯质量为加入甲苯总质量的30~40 %。
本发明的有益效果是:
在还原反应时加入助剂三氟乙酸,缩短了反应时间。
酸化后加甲苯,中间产物2,4-二氯-α-氯甲基苯甲醇溶于甲苯在上层,酸水层在下层,在一个仪器中即可完成反应、后处理,操作更方便。
中间产物2,4-二氯-α-氯甲基苯甲醇不需要固化,溶于甲苯中,直接用于后续的N-烷基化反应,大大缩短了2,4-二氯-α-氯甲基苯甲醇先固化、再溶解的时间,减轻了劳动强度、避免了因物料固化和溶解带来的物料和能源损耗。
N-烷基化反应使用弱酸强碱盐碳酸钠作催化剂,离子液体[bmim]PF6作相转移催化剂,反应时间短,副产物少。
N-烷基化反应在甲苯溶剂中进行,粗产品咪唑乙醇不需要进行干燥,直接在甲苯中提纯、结晶而得咪唑乙醇,操作简便,不需要再使用乙醇等溶剂重结晶,使用溶剂少。
附图说明
图1为本发明工艺流程图。
具体实施方式
下面结合实施案例进一步阐明本发明的方案及效果。
实施例1
在备有磁力搅拌、温度计、球型冷凝管的三口圆底烧瓶中加入异丙醇90 g、异丙醇铝12g及2,2',4'-三氯苯乙酮30 g,搅拌下加入三氟乙酸1.2 g,进行加热,反应转速控制在500~600 r/min;在67~69 ℃反应3 h;在真空度-0.08~0.1 MPa,温度67~69 ℃减压蒸馏;加入质量浓度65 %硝酸22 g 和61.5 g水配成的15 %的稀硝酸,搅拌中和异丙醇铝,加入90 g甲苯Ⅰ,静置分去下层酸水层,上层用常温水洗至中性,静置分去下层水层,得2,4-二氯-α-氯甲基苯甲醇和甲苯的混合液;
向2,4-二氯-α-氯甲基苯甲醇和甲苯的混合液中加入8 g咪唑,17 g碳酸钠,24 g、A1203 ,4 g、[bmim]PF6,15 g甲苯Ⅱ,控制温度67~69 ℃反应2.5 h,过滤,滤饼用水进行水洗,滤液用67~69 ℃水水洗至近中性,加入活性炭0.5 g,67~69 ℃保温15分钟,热滤,减压蒸馏回收甲苯27 g,滤液降温至0℃,过滤,得到咪唑乙醇31.7 g,收率为91.85 %,熔点为132.1~133.5 ℃,含量为99.6 %。
实施例2
在备有磁力搅拌、温度计、球型冷凝管的三口圆底烧瓶中加入异丙醇110 g、异丙醇铝10 g及2,2',4'-三氯苯乙酮30 g,搅拌下加入三氟乙酸1.4 g,进行加热,反应转速控制在500~600 r/min;在67~69 ℃反应2.5 h;在真空度-0.08~0.1 MPa,温度67~69 ℃减压蒸馏;加入质量浓度65 %硝酸22 g 和61.5 g水 配成的15 %的稀硝酸,搅拌中和异丙醇铝,加入80 g甲苯Ⅰ,静置分去下层酸水层,上层用常温水洗至中性,静置分去下层水层,得2,4-二氯-α-氯甲基苯甲醇和甲苯的混合液;
向2,4-二氯-α-氯甲基苯甲醇和甲苯的混合液中加入9 g咪唑、18 g碳酸钠、26 g、A1203,3 g、[bmim]PF6,10 g甲苯Ⅱ,控制温度67~69 ℃反应2.5 h,过滤,滤饼用水进行水洗,滤液用67~69 ℃水水洗至近中性,加入活性炭1.0 g,67~69 ℃保温15分钟,热滤,减压蒸馏回收甲苯36 g,滤液降温至0 ℃,过滤,得到咪唑乙醇31.9 g,收率为92.42 %,熔点为132.2~133.4 ℃,含量为99.8 %。
实施例3
在备有磁力搅拌、温度计、球型冷凝管的三口圆底烧瓶中加入异丙醇100 g、异丙醇铝11 g及2,2',4'-三氯苯乙酮30 g,搅拌下加入三氟乙酸1.0 g,进行加热,反应转速控制在500~600 r/min;在67~69 ℃反应2 h;在真空度-0.08~0.1 MPa,温度67~69 ℃减压蒸馏;加入质量浓度65 %硝酸22 g 和61.5 g水 配成的15 %的稀硝酸,搅拌中和异丙醇铝,加入100 g甲苯Ⅰ,静置分去下层酸水层,上层用常温水洗至中性,静置分去下层水层,得2,4-二氯-α-氯甲基苯甲醇和甲苯的混合液;
向2,4-二氯-α-氯甲基苯甲醇和甲苯的混合液中加入8.5 g咪唑、19 g碳酸钠、22 g、A1203,2 g、[bmim]PF6,20 g甲苯Ⅱ,控制温度67~69 ℃反应3 h,过滤,滤饼用水进行水洗,滤液用67~69 ℃水水洗至近中性,加入活性炭0.8 g,67~69 ℃保温15分钟,热滤,减压蒸馏回收甲苯48 g,滤液降温至0 ℃,过滤,得到咪唑乙醇31.5 g,收率为91.27%,熔点为132.1~133.4 ℃,含量为99.4 %。
实施例4
在备有磁力搅拌、温度计、球型冷凝管的三口圆底烧瓶中加入异丙醇100 g、异丙醇铝10 g及2,2',4'-三氯苯乙酮30 g,搅拌下加入三氟乙酸1.4 g,进行加热,反应转速控制在500~600 r/min;在67~69 ℃反应3 h;在真空度-0.08~0.1 MPa,温度67~69 ℃减压蒸馏;加入质量浓度65 %硝酸22 g和61.5 g水 配成的15 %的稀硝酸,搅拌中和异丙醇铝,加入80 g甲苯Ⅰ,静置分去下层酸水层,上层用常温水洗至中性,静置分去下层水层,得2,4-二氯-α-氯甲基苯甲醇和甲苯的混合液;
向2,4-二氯-α-氯甲基苯甲醇和甲苯的混合液中加入9 g咪唑、18 g碳酸钠、24 g、A1203,2 g、[bmim]PF6,15 g甲苯Ⅱ,控制温度67~69 ℃反应2.5 h,过滤,滤饼用水水洗,滤液用67~69 ℃水水洗至近中性,加入活性炭1.0 g,67~69 ℃保温15分钟,热滤,减压蒸馏回收甲苯32 g,滤液降温至0 ℃,过滤,得到咪唑乙醇31.6 g,收率为91.56 %,熔点为132.3~133.6 ℃,含量为99.7 %。
Claims (5)
1.一种连续法合成咪唑乙醇的方法,其特征在于:以2,2',4'-三氯苯乙酮和异丙醇为反应物,异丙醇铝作催化剂,三氟乙酸做助剂,进行还原反应,再以碳酸钠作催化剂和离子液体[bmim]PF6作相转移催化剂,进行N-烷基化,得到咪唑乙醇。
2.根据权利要求1所述的一种连续法合成咪唑乙醇的方法,其特征在于:按如下步骤制备:
在备有磁力搅拌、温度计、球型冷凝管的三口圆底烧瓶中加入异丙醇、异丙醇铝及2,2',4'-三氯苯乙酮,搅拌下加入三氟乙酸,进行加热,反应转速控制在500~600 r/min;在67~69 ℃反应2~3 h;在真空度-0.08~0.1 MPa,温度67~69 ℃减压蒸馏;加入质量浓度为15 %的稀硝酸,搅拌中和异丙醇铝,加入甲苯Ⅰ,静置后分去下层,上层用常温水洗至中性,静置后分去下层的水层,得2,4-二氯-α-氯甲基苯甲醇和甲苯的混合液;
向上述2,4-二氯-α-氯甲基苯甲醇和甲苯的混合液中,加入咪唑、碳酸钠、A1203、[bmim]PF6、甲苯Ⅱ,控制温度67~69 ℃反应2.5~3 h,过滤,滤饼用水进行水洗,滤液用67~69℃水,水洗至近中性,加入活性炭,67~69 ℃保温15分钟,热滤,减压蒸馏回收甲苯,滤液降温至0 ℃,过滤,得到咪唑乙醇。
3.根据权利要求1或2所述的一种连续法合成咪唑乙醇的方法,其特征在于:所述异丙醇铝的用量为2,2',4'-三氯苯乙酮质量的33~40 %;
所述异丙醇的用量为2,2',4'-三氯苯乙酮质量的3~3.7倍;
所述三氟乙酸的用量为2,2',4'-三氯苯乙酮质量的3.3~4.7 %;
所述甲苯Ⅰ的用量为2,2',4'-三氯苯乙酮质量的2.6~3.4倍;
所述咪唑的用量为2,2',4'-三氯苯乙酮质量的26~30 %;
所述碳酸钠的用量为2,2',4'-三氯苯乙酮质量的56~64 %;
所述A1203的用量为2,2',4'-三氯苯乙酮质量的73~87 %;
所述[bmim]PF6的用量为2,2',4'-三氯苯乙酮质量的6.6~13.4 %;
所述甲苯Ⅱ的用量为2,2',4'-三氯苯乙酮质量的33~67 %;
所述活性炭的用量为2,2',4'-三氯苯乙酮质量的1.6~3.4 %。
4.根据权利要求1所述的一种连续法合成咪唑乙醇的方法,其特征在于:所述15 %的稀硝酸为质量浓度,配制15 %稀硝酸使用质量浓度65 %硝酸与水的质量比为1:2.8。
5.根据权利要求1所述的一种连续法合成咪唑乙醇的方法,其特征在于:所述减压蒸馏回收甲苯中,是指减压蒸馏回收的甲苯质量为加入甲苯总质量的30~40 %。
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