CN108358860A - 一种高收率合成丙硫菌唑的方法 - Google Patents
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Classifications
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- C—CHEMISTRY; METALLURGY
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- C07D249/02—Heterocyclic compounds containing five-membered rings having three nitrogen atoms as the only ring hetero atoms not condensed with other rings
- C07D249/08—1,2,4-Triazoles; Hydrogenated 1,2,4-triazoles
- C07D249/10—1,2,4-Triazoles; Hydrogenated 1,2,4-triazoles 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
- C07D249/12—Oxygen or sulfur atoms
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- Y—GENERAL 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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/584—Recycling of catalysts
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Abstract
本发明涉及有机合成领域,具体是涉及一种高收率合成丙硫菌唑的方法。在合成丙硫菌唑的过程中,由于三氮唑的异构化现象,导致大量丙硫菌唑4H杂质产生,影响产品收率和产品含量。本发明以三氮唑盐为原料,在碱和催化剂存在条件下,与环氧化物中间体反应合成丙硫菌唑,显著减少的异构体杂质的产生,丙硫菌唑收率提高明显。后处理工艺简便,有较好的应用价值。
Description
技术领域
本发明涉及一种高收率合成丙硫菌唑的方法,具体是一种能有效提高原料利用率,减少4H异构体产物出现,提高产品收率的方法。
背景技术
丙硫菌唑主要用于防治禾谷类作物如小麦、大麦、油菜、花生、水稻和豆类作物等众多病害。儿乎对所有麦类病害都有很好的防治效果,如小麦和大麦的白粉病、纹枯病、枯萎病、叶斑病、锈病、菌核病、网斑病、云纹病等。还能防治油莱和花生的土传病害,如菌核病,以及主要叶面病害,如灰霉病、黑斑病、褐斑病、黑胫病、菌核病和锈病等。在合成丙硫菌唑关键中间体的过程中,由于三氮唑存在互变异构体现象,反应过程会有大量异构体产生,产品不仅精制难度提高,并且原料成本大大提高,产品总收率明显降低。因此,探索反应过程控制4H杂质产生的方法具有重要应用价值。
其中,所述丙硫菌唑及4H杂质的结构如下:
发明内容
本发明的主要任务在于提供了一种高收率合成丙硫菌唑的方法,提高原料利用率,减少4H异构体产物产生,简化后处理过程,提高产品收率。
为实现上述目的,本发明提供如下技术方案:
一种高收率合成丙硫菌唑的方法,其特征是,本发明所采取的合成路线如下。其特征是:环氧化合物与三氮唑盐在碱存在条件下,通过加热反应合成产品丙硫菌唑。
优选地:所用溶剂可以是二甲基亚砜、N,N-二甲基甲酰胺、N-甲基吡咯烷酮、二甲苯、甲苯、丁酮、乙腈中的一种或几种,更优选为甲苯。
优选地:所选的碱可以是氢氧化钙、氢氧化钠、氢氧化钾、甲醇钠、更优选为氢氧化钾。
优选地:所用的碱量是环氧化合物投料量的10mol%-60mol%,更优选为20-50mol%。
优选地:该反应所选的温度范围为80℃-160℃,更优选为100℃-140℃。
优选地:该反应的反应时间范围为8-30h,更优选为12-20h。
优选地:反应加入聚醚类、环状冠醚类、季铵盐类、叔铵类、季铵碱类、季膦盐类等催化剂,如聚乙二醇PEG、环糊精、苄基三乙基氯化铵、四丁基溴化铵、四丁基氯化铵、四丁基硫酸氢铵、三辛基甲基氯化铵、十二烷基三甲基氯化铵、十四烷基三甲基氯化铵、吡啶、三丁胺等。优选PEG 600~PEG4000、四丁基氯化铵、十四烷基三甲基氯化铵、四丁基溴化铵。
优选地:所选的催化剂的用量是环氧化合物投料量的0.1mol%-10mol%,更优选为1-5mol%。
本发明的技术效果是:
本发明采用新工艺,以环氧化合物与三氮唑盐为原料,在碱和催化剂条件下,高选择性和高收率地合成丙硫菌唑。
本发明新工艺操作简单,原料转化收率明显提高,后处理与精制过程简便,利于企业应用。
附图说明
图1为本发明的丙硫菌唑及4H杂质结构式图;
图2为本发明的丙硫菌唑合成路线图。
具体实施方式
下面参照具体的实施例对本发明作进一步地描述,以更好地理解本发明。
实施例1
向500ml三口瓶中加入丙硫菌唑环氧化合物24.0g,甲苯100mL,三氮唑钠盐10.0g,氢氧化钾1.5g,四丁基氯化铵0.5g。升温至回流,反应12h。取样测得4H异构体归一含量0.2%。降温至80℃,加水50g,分去水相。有机相继续冷却至10℃,析出大量白色固体,抽滤烘干后得到产品28.1g,收率88.5%,含量98.2%。
实施例2
向500ml三口瓶中加入丙硫菌唑环氧化合物24.0g,二甲苯100mL,三氮唑钠盐10.0g,氢氧化钠2.0g,四丁基溴化铵0.2g。升温至125℃,反应15h。取样测得4H异构体归一含量0.5%。降温至80℃,加水50g,分去水相。有机相继续冷却至10℃,析出大量白色固体,抽滤烘干后得到产品26.5g,收率84.1%,含量97.8%。
实施例3
向500ml三口瓶中加入丙硫菌唑环氧化合物24.0g,N,N-二甲基甲酰胺100mL,三氮唑钾盐11.5g,氢氧化钾2.0g,四丁基氯化铵1.0g。升温至回流,反应16h。取样测得4H异构体归一含量0.9%。脱除溶剂后,降温至80℃,加水50g和甲苯100mL搅拌30min,分去水相。有机相继续冷却至10℃,析出大量白色固体,抽滤烘干后得到产品26.2g,收率82.8%,含量97.5%。
实施例4
向500ml三口瓶中加入丙硫菌唑环氧化合物24.0g,甲苯100mL,三氮唑钾盐12.0g,氢氧化钾1.5g,聚乙二醇10000.5g。升温至回流,反应11h。取样测得4H异构体归一含量0.4%。降温至80℃,加水50g,分去水相。有机相继续冷却至10℃,析出大量白色固体,抽滤烘干后得到产品27.6g,收率87.2%,含量98.0%。
实施例5
向500ml三口瓶中加入丙硫菌唑环氧化合物24.0g,N-甲基吡咯烷酮100mL,三氮唑钠盐11.0g,氢氧化钠3.0g,聚乙二醇4001.0g。升温至130℃,|反应12h。取样测得4H异构体归一含量0.5%。减压回收溶剂后,降温至80℃,加水200g和甲苯150mL,分去水相。有机相继续冷却至10℃,析出大量白色固体,抽滤烘干后得到产品26.1g,收率83.2%,含量98.4%。
以上对本发明的具体实施例进行了详细描述,但其只是作为范例,本发明并不限制于以上描述的具体实施例。对于本领域技术人员而言,任何对本发明进行的等同修改和替代也都在本发明的范畴之中。因此,在不脱离本发明的精神和范围下所作的均等变换和修改,都应涵盖在本发明的范围内。
Claims (8)
1.一种高收率合成丙硫菌唑的方法,其特征是,本发明所采取的合成路线如下。其特征是:环氧化合物与三氮唑盐在碱存在条件下,通过加热反应合成产品丙硫菌唑。
2.根据权利要求1所述的合成反应,其特征是:所用溶剂可以是二甲基亚砜、N,N-二甲基甲酰胺、N-甲基吡咯烷酮、二甲苯、甲苯、丁酮、乙腈中的一种或几种,更优选为甲苯。
3.根据权利要求1所述的合成反应,其特征是:所选的碱可以是氢氧化钙、氢氧化钠、氢氧化钾、甲醇钠、更优选为氢氧化钾。
4.根据权利要求1所述的合成反应,其特征是:所用的碱量是环氧化合物投料量的10mol%-60mol%,更优选为20-50mol%。
5.根据权利要求1所述的合成反应,其特征是:该反应所选的温度范围为80℃-160℃,更优选为100℃-140℃。
6.根据权利要求1所述的合成反应,其特征是:该反应的反应时间范围为8-30h,更优选为12-20h。
7.根据权利要求1所述的合成反应,其特征是:反应加入聚醚类、环状冠醚类、季铵盐类、叔铵类、季铵碱类、季膦盐类等催化剂,如聚乙二醇PEG、环糊精、苄基三乙基氯化铵、四丁基溴化铵、四丁基氯化铵、四丁基硫酸氢铵、三辛基甲基氯化铵、十二烷基三甲基氯化铵、十四烷基三甲基氯化铵、吡啶、三丁胺等。优选PEG 600~PEG4000、四丁基氯化铵、十四烷基三甲基氯化铵、四丁基溴化铵。
8.根据权利要求1所述的合成反应,其特征是:所选的催化剂的用量是环氧化合物投料量的0.1mol%-10mol%,更优选为1-5mol%。
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