共查询到20条相似文献,搜索用时 78 毫秒
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N-烷基咪唑盐酸盐的合成及性能 总被引:1,自引:0,他引:1
咪唑及其衍生物常用作药物、抗菌剂、酶抑制剂和其它精细化学品[1 5]。本文通过丙烯腈与咪唑加成生成1 (β 氰乙基)咪唑,然后与溴代烃进行季铵盐消去反应合成N 烷基咪唑,经与HCl中和制得N 烷基咪唑盐酸盐,总收率大于90%。性能研究表明,N 十二烷基咪唑盐酸盐HLB值为12;在硬水中的平均稳定性为5级;润湿力与十六烷基三甲基氯化铵和平平加 O相近;分散力与平平加 O和十二烷基硫酸钠基本相同;发泡力低;对液体石蜡有较好的乳化力。1 实验部分在250ml三口烧瓶中加入13 6g(0 20mol)咪唑、15g甲醇和15g丙烯腈,升温至50~60℃回流反应3h。减压… 相似文献
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用KOH/Al2O3合成N—烷基咪唑 总被引:11,自引:0,他引:11
N-烷基化咪唑类化合物的合成常以咪唑为原料,在强碱的作用下,经烷基化反应而获得。方法有醇钠或氨基钠与咪唑反应,生成咪唑负氮离子,然后再与烷基化试剂反应以及在相转移催化下咪唑与烷基化试剂的反应。近年来,应用无机载体试剂进行各种有机合成反应已引起人们的广泛兴趣。我们以KOH/Al_2O_3为载体试剂合成了10种N-烷基咪唑衍生物,收率一般在80%以上。其中某些反应室温下即可完成,操作十分简便。且载体经再生后使用活性不变。 相似文献
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据Jelinek报道,N,N-二烷基-氨基甲酰基膦酰胺酯类化合物具有抑制植物生长的活性,能影响多种植物的开花和坐果。为探讨这类化合物的合成方法、结构与活性的关系,从而筛选出高效低毒的除草剂,本文合成了通式为RO(R′NH)P(O)C(O)-NHR~2的10种新化合物(表1)。对于合成方法进行了初步探讨,其中方法Ⅱ未见文献报道。 相似文献
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《Tetrahedron》1998,54(14):3589-3606
A series of N-alkyl-2-oxoalkanesulfonamides have been synthesized by reacting silyl enol ethers with N-alkyl-sulfamoyl chlorides. Their reactivity towards electrophiles was investigated in order to explore the regio-aand stereoselectivity of the process. 2-Oxoalkanesulfonamides were used to prepare 5-(methylsulfamoyl)-1,4-dihydropyridines derivatives. 相似文献
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Livantsov M. V. Prishchenko A. A. Novikova O. P. Livantsova L. I. Koval' Ya. N. Grigor'ev E. V. 《Russian Journal of General Chemistry》2002,72(11):1822-1823
Russian Journal of General Chemistry - 相似文献
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Brendon T. Sargent Erik J. Alexanian 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(28):9633-9636
Metal‐catalyzed aminocarbonylation is a standard approach for installing amide functionality in chemical synthesis. Despite broad application of this transformation using aryl or vinyl electrophiles, there are few examples involving unactivated aliphatic substrates. Furthermore, there are no stereocontrolled aminocarbonylations of alkyl electrophiles known. Herein, we report a stereospecific aminocarbonylation of unactivated alkyl tosylates for the synthesis of enantioenriched amides. This cobalt‐catalyzed transformation uses a remarkably broad range of amines and proceeds with excellent stereospecificity and chemoselectivity. 相似文献
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In recent years, exciting progress has been made in the field of direct transformation of amides, nevertheless, the condensation between two amides remains rare and restricted to homo‐coupling reactions. Herein, we report the cross‐coupling of secondary amides with tertiary amides, which provides a synthesis of ketones under mild conditions, and features the use of tertiary amides as surrogates of alkyl carbanions. The method relies on the coupling of enamines, generated from tertiary amides by catalytic partial reduction of tertiary amides with Vaska's catalyst, with nitrilium ions, formed in situ from secondary amides via activation with trifluoromethanesulfonic anhydride, and on the subsequent deformylation. 相似文献
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采用氰基丙烯酸酯与5-乙氧基-1,3,4-噻二唑-2-甲氨在乙醇中加热回流的方法合成了一系列3-(5′-乙氧基-1,3,4-噻二唑-2′-亚甲氨基)-2-氰基-3-取代-丙烯酸酯类化合物.目标化合物结构均经1HNMR和元素分析确证.生物活性测试结果表明,部分化合物对双子叶杂草油菜和苋菜显示出较好的除草活性及良好的选择性,用化合物6j在600g/ha剂量下对油菜和苋菜茎叶进行处理,抑制率仍达100%和95.2%,与对照样B相当;氰基丙烯酸酯3位取代基体积对除草活性影响较大,3位为异丙基时活性最高. 相似文献
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This article reports the CuCN-mediated O-alkylation of formamide with 2-bromomethylindole. In addition, the formyloxylation products have been successfully exploited in the synthesis of novel indol-2-ylmethyl ether derivatives. 相似文献