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2-烷氨基苯并噻吩并嘧啶酮类衍生物的合成研究学生:指导老师:一研究背景二实验内容三结果与讨论四致谢一研究背景噻吩并嘧啶衍生物是一类具有良好的杀菌活性和药理活性的杂环化合物,已经广泛应用于农药、医药等领域,文献中已经报道了多种这类杂环的合成方法。然而运用aza-Wittig反应来合成苯并噻吩并[3,2-d]嘧啶-4(3H)酮的则鲜见文献报道。二实验内容1.合成路线SSCNClNH2COOEtNCOOEtPPh3NaSCH2COOEtPPh3,C2Cl6CH3CNSNCOOEtCNRRNCOR'NH2/R'2NHSNNR'2NHRCOOEtSNNNR'2RONaORABCD2实验步骤中间体A的合成称取HSCH2COOEt置于干燥圆底烧瓶中,加入新蒸的绝对无水乙醇,水浴搅拌下加入少量剪碎的钠屑,反应30min,减压脱干乙醇得白色粉状固体,向其中加入DMF将其溶解,然后向其中加入溶有邻氯苯腈的DMF溶液,室温搅拌反应6h。将其倒入冰水中,边倒边搅拌,析出大量白色固体,抽滤,干燥,乙醚/石油醚重结晶,得白色固体,即3-氨基-2-乙氧碳基苯并噻吩(A)。SCNClNH2COOEtNaSCH2COOEtA2.实验步骤中间体B的合成称取上述干燥的3-氨基-2-乙氧羰基苯并噻吩(A)置于三颈圆底烧瓶中,加入乙睛,三苯基磷,六氯乙烷,室温搅拌反应10min,水浴条件下慢慢滴加无水三乙胺,滴毕,撤去水浴于室温搅拌反应6hr,抽滤,固体用乙腈洗两次,再在乙醇中加热回流30min,趁热过滤,干燥,得白色晶体,2-乙氧羰基-3-三苯基膦亚胺苯并噻吩(B)。SSNH2COOEtNCOOEtPPh3PPh3,C2Cl6CH3CNAB2.实验步骤中间体C的合成在0-5℃及干燥氮气保护下,将芳(烷)基异氰酸酯滴加到膦亚胺(B)的二氯甲烷溶液中,在0-5℃静置反应10-12hr,减压脱去大部分溶剂,加入V(醚):V(石油醚)=l:2的混合溶剂,过滤以除去三苯氧磷,滤液在减压下脱去大部分溶剂即得碳二亚胺(C)。SNCOOEtPPh3BSNCOOEtCNRRNCOC2.实验步骤目标产物的合成将所得碳二亚胺(C)溶于二氯甲烷中,滴加相应的仲(伯)胺,在室温下静置反应0.5hr,得到胍中间体(D).脱去所得胍中间体(D)的溶剂,加入无水乙醇和几滴乙醇钠的无水乙醇溶液,在室温下搅拌反应8-12hr,减压脱去溶剂,残余物以甲醇或二氯甲烷/石油醚重结晶,得2一烷氨基苯并噻吩并[3,2-d]嘧啶-4(3H)酮衍生物。SNNNR'2RONaORSNCOOEtCNRR'NH2/R'2NHSNNR'2NHRCOOEtCD3.目标产物CompR’RYield/%1-CH(CH3)2662-CH(CH3)2643264245-(CH2)4CH3166-(CH2)4CH3157-(CH2)5CH388-(CH2)3CH310CH3OCF3NONR'2=CH3NONR'2=OCF3OCF3CH3CH3CH3SNNNR'2RO三结果与讨论中间体的反应条件1因中间体A易水解,故应保持体系绝对无水。用乙醚/石油醚重结晶时,石油醚应少量,一般每10ml乙醚中加5-7滴石油醚,这样可保证中间体产率。2中间体A干燥时,由于熔点较低,干燥温度不宜过高,否则会发生分解,一般干燥温度35℃左右。3加入三乙胺时应使用恒压滴液漏斗,且在冰水浴条件下,滴加时每分钟3-5滴为宜,否则因反应剧烈,放出大量的热量,难以控制导致反应体系变黑。4同样,干燥膦亚胺时,温度不宜过高,否则易分解,一般45℃左右。碳二亚胺及目标产物的反应条件1由于碳二亚胺C易发生聚合或水解,制备碳二亚胺C时不宜在过高的温度下进行,以0-5℃为佳。在实验操作中,碳二亚胺C与类胍中间体D都无需分离纯化,可得到较高的产率,这样大大简化了实验操作。2类胍中间体D不稳定,得到胍中间体后立即加醇钠催化剂,否则易发生分解,影响产率。3目标产物重结晶时,非常关键,二氯甲烷/石油醚所配比例根据不同产物有所不同,一般二氯甲烷/石油醚=1:2(体积比),对于重结晶过程中出现油状物质应尽量除去,以免影响产物纯度,而对于用二氯甲烷/石油醚无法结晶的,可考虑用乙醚/石油醚重结晶。三结果与讨论目标产物的波谱性质三结果与讨论629.60726.74753.231150.611336.061444.971509.731536.221674.572923.33253035404550556065707580859095100%T5001000150020002500300035004000Wavenumbers(cm-1)目标产物1(mp150-151℃)SNNNOOCF3ppm(f1)1.02.03.04.05.06.07.08.09.001002003004005006007008008.2338.2207.8697.8557.5537.5417.5407.5027.4907.4777.3857.3827.3717.3487.3337.2553.5753.5643.5533.5423.5311.5621.1761.1651.005.740.520.500.520.531.93ppm(f1)7.508.00-100-500501001502002508.2338.2207.8697.8557.5537.5417.5407.5027.4907.4777.3857.3827.3717.3487.3337.2550.520.500.520.531.93SNNNOOCF3626.66682.58720.85750.291156.501447.911509.731533.281674.572975.633066.88101520253035404550556065707580859095100%T5001000150020002500300035004000Wavenumbers(cm-1)目标产物2(mp165-166℃)SNNNOppm(t1)1.02.03.04.05.06.07.08.09.00500100015008.2288.2167.8557.8417.5457.5437.5317.5207.5187.4867.4857.4737.4617.4607.2767.2637.2557.1937.1793.6143.6033.5923.5813.5692.3961.5851.1591.1481.001.516.200.490.500.511.020.501.04ppm(t1)7.007.508.008.50-300-200-10001002003004005006008.2288.2167.8557.8417.5457.5437.5317.5207.5187.4867.4857.4737.4617.4607.2767.2637.2557.1937.1790.490.500.511.020.501.04SNNNO664.92756.17870.97935.731115.291247.751450.861512.671536.221677.512852.002972.693058.05-0102030405060708090100%T5001000150020002500300035004000Wavenumbers(cm-1)SNNOCH3NO目标产物3(mp163-165℃)535.40656.09694.36723.79756.171115.291185.941439.081536.221683.402955.033052.1762646668707274767880828486889092949698100%T5001000150020002500300035004000Wavenumbers(cm-1)SNNOOCF3NO目标产物4(mp111-113℃)544.24617.83697.30753.23994.601071.141118.231191.821312.511436.141483.241589.212987.413052.175101520253035404550556065707580859095100%T5001000150020002500300035004000Wavenumbers(cm-1)SNNOOCF3N(CH2)4CH3(CH2)4CH3目标产物5(mp159-161℃)541.29617.83697.30750.29935.73997.551074.081118.231188.881312.511436.141680.462960.923058.055101520253035404550556065707580859095100%T5001000150020002500300035004000Wavenumbers(cm-1)SNNOCH3N(CH2)4CH3(CH2)4CH3目标产物6(mp155-157℃)538.35667.87691.41723.79756.17994.601074.081118.231191.821309.571436.141489.131592.152336.882363.373055.11646668707274767880828486889092949698100%T5001000150020002500300035004000Wavenumbers(cm-1)SNNOCH3N(CH2)5CH3(CH2)5CH3目标产物7(mp166-167℃)541.29653.15697.30723.79759.12994.601118.231188.881315.451374.331439.081542.111589.211686.352869.662955.033055.1162646668707274767880828486889092949698100%T5001000150020002500300035004000Wavenumbers(cm-1)SNNOCH3N(CH2)3CH3(CH2)3CH3目标产物8(mp165-166℃)四致谢非常感谢xxx老师的对我的悉心指导、督促、鼓励和支持!同时也非常感谢与我并肩作战的舍友与同学们,感谢关心和支持我的朋友们,感谢你们给予我的帮助与关怀,谢谢!Thankyouforyourattention!
本文标题:苯并噻吩并嘧啶酮类衍生物的合成研究-毕业答辩ppt
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