CN115960016A - 一种n-甲基-双(2,4-二甲苯基亚胺甲基)胺的制备方法 - Google Patents
一种n-甲基-双(2,4-二甲苯基亚胺甲基)胺的制备方法 Download PDFInfo
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Abstract
本发明公开了N‑甲基‑双(2,4‑二甲苯基亚胺甲基)胺的制备方法。以原甲酸三甲酯,2,4‑二甲基苯胺和N‑甲基甲酰胺为起始原料,在有机碱催化剂催化下一锅法进行缩合反应,经减压蒸馏、脱色、结晶、抽滤、干燥得到N‑甲基‑双(2,4‑二甲苯基亚胺甲基)胺。本发明用有机碱催化剂代替路易斯酸催化剂和2,4‑二甲基苯胺盐酸盐,省去了催化剂2,4‑二甲基苯胺盐酸盐制备步骤。用原甲酸三甲酯代替原甲酸三乙酯,提高了反应活性,降低了反应温度和反应时间。制备的N‑甲基‑双(2,4‑二甲苯基亚胺甲基)胺纯度可达到99.8%以上,收率达到88.0%以上。
Description
技术领域
本发明属于化学或药物化学领域,具体涉及一种N-甲基-双(2,4-二甲苯基亚胺甲基)胺的制备方法。
背景技术
N-甲基-双(2,4-二甲苯基亚胺甲基)胺,又称双甲脒、螨克、双虫脒、果螨杀。是一种广谱性甲脒类杀螨杀虫剂,属中等毒性杀螨剂。1971年帕尔默(B.H.Palmer)等人报道了它的杀螨活性,1973年布茨有限公司(Boots Co.Ltd.)推荐做杀螨剂。化学名称:N-甲基-双(2,4-二甲苯基亚胺甲基)胺为白色或黄色针状结晶,具有一些碳胺的味道。对叶螨科各种虫态都有效,但对越冬卵效果较差。具有多种毒杀机制,主要是抑制单胺氧化酶的活性,对害螨中枢神经系统的非胆碱能突触诱发兴奋作用。对其他杀螨剂产生抗药性的害螨也有较高活性。药效期可达40~50天。主要用于果树、蔬菜、茶叶、棉花、大豆、甜菜等作物防治各种害螨,对木虱类也具有良好防效,对部分鳞翅目害虫卵有效,对蚧、蚜及棉铃虫、红铃虫等亦有一定兼治效果,也可防治牛、羊蜱螨及蜂螨。双甲脒可与有机磷和菊酯类、阿维菌素等农药混用,有增效作用,并可扩大杀虫谱。混配制剂有10.8%阿维·双甲乳油。
目前N-甲基-双(2,4-二甲苯基亚胺甲基)胺的合成路线主要有三条,合成路线一:甲基甲酰胺法
以氯化亚砜或对甲苯磺酰氯为缩合剂,二甲苯为溶剂,2,4-二甲基苯胺和甲基甲酰胺缩合。冷却下,水相调节pH提取单甲脒,然后过滤,水洗至中性,烘干溶于二甲苯中,加入对甲苯磺酸催化剂,高温回流48h,蒸出二甲苯,再用异丙醇结晶得单甲脒。此工艺步骤长,使用原材料品种较多,反应时间长,操作程序多,总收率较低,在实际生产中可应用性不强。
合成路线二:原甲酸三乙酯法
将2,4-二甲基苯胺与盐酸反应生成2,4-二甲基苯胺,作为第二催化剂,并与第一催化剂路易斯酸共同催化下与原甲酸三乙酯、N-甲基甲酰胺缩合,蒸出反应溶剂。但该工艺反应温度高,达到了200℃,反应时间长,达到了15小时,生产效率低。
合成路线三:二甲苯胩法
2,4-二甲基苯胺与甲酸反应制得N-2,4-二甲苯基甲酰胺,再与光气反应,以三乙胺为缚酸剂,得到2,4-二甲苯胩,然后把干燥的甲胺气体通入苯胩与氧化亚铜的混合物中,反应结束后,加入环己烷,过滤得单甲脒,然后再与苯胩反应,重结晶得双甲脒。但该工艺路线长,合成较复杂,苯胩味道极难闻,工业生产几乎不会选用。
甲基甲酰胺法中间体单甲脒,在萃取、中和、水洗及干燥过程中极易水解,在较高温度回流时易发生歧化反应。由于一系列副反应,造成产品纯度差,收率偏低,且三废处理量大。原甲酸三乙酯法需要无水条件,反应需要长时间回流,且甲胺通入会带走部分溶剂,造成难以回收及一定程度的污染。二甲苯胩法中间体单甲脒不稳定,且苯胩味道极其难闻,整个工艺不绿色环保。
因此,有待开发一种绿色环保、反应温和、副反应少,合成路线简短,操作简便,高纯度的N-甲基-双(2,4-二甲苯基亚胺甲基)胺制备方法。
发明内容
本发明的目的在于提供一种绿色环保、反应温和、副反应少,合成路线简短,操作简便,高纯度的N-甲基-双(2,4-二甲苯基亚胺甲基)胺制备方法,具体技术方案如下:
一种N-甲基-双(2,4-二甲苯基亚胺甲基)胺的制备方法,其特征在于,经由下述化学反应方程式制备:
上述反应方程式具体制备步骤如下:
(1)缩合反应:向反应瓶中投入原甲酸三甲酯,2,4-二甲基苯胺,N-甲基甲酰胺,开启搅拌,加入有机碱催化剂,加热,保温。
(2)蒸馏:减压蒸馏出副产甲酸甲酯和甲醇。
(3)脱色、结晶:降温,加入醇类溶剂和脱色活性炭,保温搅拌,热过滤。滤液降温结晶,保温,抽滤,干燥,得N-甲基-双(2,4-二甲苯基亚胺甲基)胺。
所述的一种N-甲基-双(2,4-二甲苯基亚胺甲基)胺的制备方法,其特征在于:反应步骤(1)中,所述的原甲酸三甲酯,其用量为2,4-二甲基苯胺重量的1.2-1.3倍;所述的N-甲基甲酰胺,其用量为2,4-二甲基苯胺重量的0.2-0.3倍;所述的有机碱催化剂为1,5-二氮杂双环[4.3.0]壬-5-烯(DBN)、1,1,3,3-四甲基胍(TMG)、1,8-二氮杂双环[5.4.0]十一碳-7-烯(DBU)、N,N-二异丙基乙胺(DIEA)、4-二甲氨基吡啶(DMAP)、三乙烯二胺、氮甲基吗啡啉中的至少一种,其用量为2,4-二甲基苯胺重量的0.1-2%;所述的加热加热终点温度为150-160℃;所述的保温反应温度为150-160℃,保温反应时间为1-1.5小时。
所述的一种N-甲基-双(2,4-二甲苯基亚胺甲基)胺的制备方法,其特征在于:反应步骤(2)中,所述的减压蒸馏温度为120-160℃,真空压力为-0.03MPa至-0.1MPa,蒸馏终点为无连续馏分流出。
所述的一种N-甲基-双(2,4-二甲苯基亚胺甲基)胺的制备方法,其特征在于:反应步骤(3)中,所述的醇类溶剂为异丙醇、乙醇、特戊醇、正丙醇中的至少一种,其用量为2,4-二甲基苯胺重量的2-6倍;所述的脱色活性炭,其用量为2,4-二甲基苯胺重量的2%-10%;所述的脱色温度为80-90℃,脱色时间为0.5-1小时;所述的降温结晶温度为0-5℃,结晶保温时间为1-2小时;所述的干燥温度为70-80℃,干燥时间为6-12小时。
本发明的有益效果在于:
1)本发明提供的N-甲基-双(2,4-二甲苯基亚胺甲基)胺制备方法用有机碱催化剂代替路易斯酸催化剂和2,4-二甲基苯胺盐酸盐,省去了催化剂2,4-二甲基苯胺盐酸盐制备步骤。用原甲酸三甲酯代替原甲酸三乙酯,提高了反应活性,降低了反应温度和反应时间。
2)根据本发明提供的制备方法所制备的N-甲基-双(2,4-二甲苯基亚胺甲基)胺纯度可达到99.8%以上,杂质A小于0.05%,杂质B小于0.05%,杂质C小于0.10%,杂质D小于0.10%。收率达到88.0%以上。
具体实施方式
下述通过具体的实施例,对本发明做详细的描述,以下实施例用于解释本发明,而不是对本发明的限制。
实施例1
向500ml四口瓶中加入原甲酸三乙甲酯172g,2,4-二甲基苯胺136g,N-甲基甲酰胺36g和4-二甲氨基吡啶0.8g,开启搅拌,升温至150℃,保温反应1.5小时。减压蒸馏,真空压力-0.08MPa,蒸馏温度为125-150℃,直至无连续馏分流出。降温至80℃,加入正丙醇300g和活性炭2.8g,80-90℃保温搅拌30分钟,抽滤,滤液降温至0℃,保温2小时,抽滤,用30ml正丙醇淋洗滤饼,80℃干燥12小时,得到白色固体292.7g,收率为88.9%(理论产量为329.3g)。
有关物质:
实施例2
向1000ml四口瓶中加入原甲酸三甲酯165g,2,4-二甲基苯胺136g,N-甲基甲酰胺32g和1,8-二氮杂双环[5.4.0]十一碳-7-烯2.5g,开启搅拌,升温至160℃,保温反应1小时。减压蒸馏,真空压力-0.08MPa,蒸馏温度为145-160℃,直至无连续馏分流出。降温至80℃,加入特戊醇500g和活性炭2.5g,80-90℃保温搅拌1小时,抽滤,滤液降温至5℃,保温2小时,抽滤,用30ml特戊醇淋洗滤饼,80℃干燥12小时,得到白色固体290.1g,收率为88.1%(理论产量为329.3g)。
有关物质:
实施例3
向1000ml四口瓶中加入原甲酸三甲酯176g,2,4-二甲基苯胺136g,N-甲基甲酰胺40g和1,1,3,3-四甲基胍(TMG)2.7g,开启搅拌,升温至155℃,保温反应1.5小时。减压蒸馏,真空压力-0.09MPa,蒸馏温度为150-160℃,直至无连续馏分流出。降温至80℃,加入正丙醇700g和活性炭13.6g,80-90℃保温搅拌1小时,抽滤,滤液降温至5℃,保温2小时,抽滤,用正丙醇100g淋洗滤饼,80℃干燥10小时,得到白色固体291.4g,收率为88.5%(理论产量为329.3g)。
有关物质:
本发明不限于上述实施例,凡依据本发明的技术实质对上述实施例作的任何简单、等同变化或修饰,均属于本发明技术范围内。
Claims (4)
2.根据权利要求1所述的一种N-甲基-双(2,4-二甲苯基亚胺甲基)胺的制备方法,其特征在于:反应步骤(1)中,所述的原甲酸三甲酯,其用量为2,4-二甲基苯胺重量的1.2-1.3倍;所述的N-甲基甲酰胺,其用量为2,4-二甲基苯胺重量的0.2-0.3倍;所述的有机碱催化剂为1,5-二氮杂双环[4.3.0]壬-5-烯(DBN)、1,1,3,3-四甲基胍(TMG)、1,8-二氮杂双环[5.4.0]十一碳-7-烯(DBU)、N,N-二异丙基乙胺(DIEA)、4-二甲氨基吡啶(DMAP)、三乙烯二胺、氮甲基吗啡啉中的至少一种,其用量为2,4-二甲基苯胺重量的0.1-2%;所述的加热终点温度为150-160℃;所述的保温反应温度为150-160℃,保温反应时间为1-1.5小时。
3.根据权利要求1所述的一种N-甲基-双(2,4-二甲苯基亚胺甲基)胺的制备方法,其特征在于:反应步骤(2)中,所述的减压蒸馏温度为120-160℃,真空压力为-0.03MPa至-0.1MPa,蒸馏终点为无连续馏分流出。
4.根据权利要求1所述的一种N-甲基-双(2,4-二甲苯基亚胺甲基)胺的制备方法,其特征在于:反应步骤(3)中,所述的醇类溶剂为异丙醇、乙醇、特戊醇、正丙醇中的至少一种,其用量为2,4-二甲基苯胺重量的2-6倍;所述的脱色活性炭,其用量为2,4-二甲基苯胺重量的2%-10%;所述的脱色温度为80-90℃,脱色时间为0.5-1小时;所述的降温结晶温度为0-5℃,结晶保温时间为1-2小时;所述的干燥温度为70-80℃,干燥时间为6-12小时。
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