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时间:2019-10-15
《基于重氮化和Meerwein芳基化的_一锅法_合成唑草酮工艺》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第31卷第5期精细化工Vol.31,No.52014年5月FINECHEMICALSMay2014精细化工中间体基于重氮化和Meerwein芳基化的“一锅法”合成唑草酮工艺*俞娟,樊俭俭,陈凯,付行花,朱红军(南京工业大学理学院,江苏南京211816)摘要:以氯化亚铜(CuCl)为催化剂,亚硝酸叔丁酯(t-BuONO)为重氮化试剂,在溶剂乙腈或丁酮中,1-(5-氨基-2-氟-4-氯苯基)-3-甲基-4-二氟甲基-1H-1,2,4-三唑啉-5-酮(TZLO-A)经重氮化和Meerwein芳基化“一锅法”制备得113到目标化合物唑草酮,产物经HNMR、CNMR和MS表征。合成条件经实验优化,确
2、定了最佳反应条件:n(TZLO-A)∶n(氯化亚铜)∶n(丙烯酸乙酯)∶n(亚硝酸叔丁酯)=1∶(0.6~0.7)∶13.7∶1.5,盐酸(HCl)和亚硝酸叔丁酯滴加时间分别为20min和150min,产品收率达到了92.9%,HPLC色谱含量为92%。关键词:1-(5-氨基-2-氟-4-氯苯基)-3-甲基-4-二氟甲基-1H-1,2,4-三唑啉-5-酮;重氮化;唑草酮;Meerwein芳基化;精细化工中间体中图分类号:TQ457.2文献标识码:A文章编号:1003-5214(2014)05-0671-05One-PotSynthesisProcessoftheCarfentrazone-
3、EthylBasedonDiazotizationandMeerweinArylationReaction*YUJuan,FANJian-jian,CHENKai,FUXing-hua,ZHUHong-jun(CollegeofScience,NanjingTechnologyUniversity,Nanjing211816,Jiangsu,China)Abstract:Carfentrazone-ethylwassynthesizedbyone-potreactionwith1-(5-amino-4-chloro-2-fluorophenyl)-4-(difluoromethyl)-3-
4、methyl-1H-1,2,4-triazol-5(4H)-one(TZLO-A)asrawmaterials,copper(Ⅰ)chloride(CuCl)ascatalystandt-butylnitrite(t-BuONO)asdiazotizationreagentthroughdiazotizationandMeerweinarylationreactioninacetonitrileorbutanone.Thestructureoftheproduct113wascharacterizedbymeansofHNMR,CNMRandMSspectrum.Theoptimumrea
5、ctionconditionsofsynthesiswereobtainedasfollows:themolarratiobetweenTZLO-A,copper(Ⅰ)chloride,ethylacrylate,andt-butylnitritewas1∶(0.6~0.7)∶13.7∶1.5,andtheaddingtimeofhydrochloricacidandt-butylnitritewas20minand150minrespectively.Undertheseconditions,thetargetproductwasobtainedwithayieldof92.9%andw
6、ithapurityof92%.Keywords:1-(5-amino-4-chloro-2-fluorophenyl)-4-(difluoromethyl)-3-methyl-1H-1,2,4-triazol-5(4H)-one;diazotization;carfentrazone-ethyl;Meerweinarylation;finechemicalintermediatesFoundationitems:NationalKeyTechnologyR&DProgramoftheMinistryofScienceandTechnology(2011BAE06A07-04),theTe
7、chnologyR&DProgramofJiangsuProvince(BE2012363)[1]唑草酮(Carfentrazone-ethyl,又称唑酮草酯、过抑制叶绿素生物合成过程中原卟啉原氧化酶而引[3]福农和快灭灵等)是由FMC公司开发的三唑啉酮类起细胞膜破坏,使叶片迅速干枯、死亡。其主要[2]除草剂,该品种属原卟啉原氧化酶抑制剂,即通用于防除阔叶杂草和莎草,且对磺酰脲类除草剂产收稿日期:2013-12-31;定
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