CN114957145A - 一种1,2,4-苯并三嗪衍生物及其制备方法 - Google Patents
一种1,2,4-苯并三嗪衍生物及其制备方法 Download PDFInfo
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Abstract
本发明公开了一种1,2,4‑苯并三嗪衍生物及其制备方法,将式II结构所示的1‑(三氟甲烷磺酰基)‑1H‑苯并三唑化合物、式III结构所示的锍盐化合物、缚酸剂加入到反应溶剂中,反应后得到。本发明直接通过硫叶立德和1‑(三氟甲烷磺酰基)‑1H‑苯并三唑的[5+1]环加成串联反应,无需进行官能团预组装即可直接得到1,2,4‑苯并三嗪衍生物I。本反应原料廉价易得,无过渡金属参与,绿色高效,条件温和,底物适用范围广,反应收率较高,操作简单。为1,2,4‑苯并三嗪骨架的高效合成提供了新途径。
Description
技术领域
本发明属于有机合成领域,具体涉及一种1,2,4-苯并三嗪衍生物及其制备方法。
背景技术
1,2,4-苯并三嗪化合物作为一种重要的苯并含氮杂环化合物,其结构广泛存在于许多天然产物和药物分子中。其在抗菌、抗癌、材料应用等领域扮演着重要的角色。例如(文献1:Zhou,Y.J.;Zhang,Z.J.;Jiang,Y.W.;Pan,X.H.;Ma,D.W.Synthesis of 1,2,4-Benzotriazines via Copper(I)Iodide/1H-Pyrrole-2-carboxylic Acid CatalyzedCoupling of o-Haloacetanilides and N-Boc Hydrazine.Synlett.2015,26,1586-1590.;文献2:Karin,P.;Michael,P.H.Stille Coupling Reactions in the Synthesisof Hypoxia-Selective 3-Alkyl-1,2,4-Benzotriazine 1,4-Dioxide AnticancerAgents.J.Org.Chem.2006,71,6530-6535.;文献3:Paulina,B.;Victor,G.Y.;Piotr,K.Ring-Fused 1,4-Dihydro[1,2,4]triazin-4-yls throughPhotocyclization.Org.Lett.2020,22,3835-3840.)分别公开了如下1,2,4-苯并三嗪化合物:
近年来,对该类化合物合成方法的研究极大地吸引着研究者的兴趣。
1889年,Bischler等(Bischler,A.Orthonitrophenylhydrazine.Ber.Dtsch.Chem.Ges.1889,22,2801-2809.)首次报道合成了无取代的1,2,4-苯并三嗪。该方法用(2-硝基苯基)乙酰肼为原料,依次经历还原,亲核加成,氧化得到目标产物。
2009年,Kumar等(Kumar,A.;Parshad,M.;Gupta,R.K.;Kumar,D.Hypervalentiodine mediated oxidation of 1,2-diaminobenzimidazole and its Schiff bases:efficient synthesis of 3-amino-1,2,4-benzotriazine and 2-aryl-1,2,4-triazolo[1,5-a]benzimidazoles.Synthesis.2009,10,1663-1666.)用羟胺磺酸在2-氨基苯并咪唑的一号位上组装氨基生成1,2-二氨基苯并咪唑,并进一步在PdI(OAc)2的催化下,制备生成了3-氨基-1,2,4-苯并三嗪。
2012年,Huang等(Guo,H.;Liu,J.;Wang,X.X.;Huang,G.S.Copper-catalyzeddomino reaction of 2-haloanilines with hydrazides:A new route for thesynthesis of benzo[e][1,2,4]triazine derivatives.Synlett.2012,23,903-906.)利用2-碘苯胺与苯甲酰肼在一价铜作用下发生偶联,亲核加成闭环反应,制备得到了一系列3-苯基-1,2,4-苯并三嗪。优点是底物适应性广,原料廉价易得。缺点是反应事先需要预组装卤原子才能进行。
2019年,Jiang等(Zhang,T.S.;Zhang,H.;Fu,R.;Wang,J.;Hao,W.J.;Tu,S.J.;Jiang,B.Tert-butyl peroxide(TBHP)/KI-mediated dual C(sp2)-H bond amination ofarylamines withα-diazo carbonyls toward 1,2,4-benzotriazines.Chem.Commun.2019,55,13231-13234.)在无金属氧化剂存在下,利用自由基诱导实现了芳胺和重氮化合物的串联反应,制备出了一系列1,2,4-苯并三嗪衍生物。该反应条件温和,底物适应性广泛。
2021年,Zhu等(Wu,W.P.;Fan,S.X.;Li,T.L.;Fang,L.L.;Chu,B.F.;Zhu,J.Cobalt-Catalyzed,Directed Intermolecular C-H Bond Functionalization forMultiheteroatom Heterocycle Synthesis:The Case ofBenzotriazine.Org.Lett.2021,23,5652-5657.)报道了利用钴催化剂,定向的活化了C-H键,实现了芳基肼和恶二唑酮的串联反应,制备出了一系列3-苯基-1,2,4-苯并三嗪。
迄今为止,绝大多数合成方法依赖于在最终发生分子内闭环反应之前,对开链分子前驱体进行复杂的多步预组装。而这种预组装过程往往会导致很多基团的引入受到限制。钯等过渡金属的使用,不经济、不环保。此外,很多方法的产率并不是很高,工业化生产较为困难。
发明内容
本发明提供了一种1,2,4-苯并三嗪衍生物的制备方法。本方法基于1-(三氟甲烷磺酰基)-1H-苯并三唑(或衍生物)和硫叶立德的[5+1]串联环化反应,绿色高效的实现了一系列1,2,4-苯并三嗪衍生物的合成。该方法无需进行预组装、无需过渡金属催化,原料廉价易得,反应条件温和,底物适用范围广。为1,2,4-苯并三嗪衍生物的合成提供了一条能进行工业化生产的新途径。
本发明同时提供一种由上述方法制备得到的1,2,4-苯并三嗪衍生物。
一种1,2,4-苯并三嗪衍生物,为式I结构:
其中,R1为H、C1~C3烷基、C1~C3烷氧基、卤素、硝基;R2为苯基、C1~C3烷基取代苯基、C1~C3烷氧基取代苯基、卤素取代苯基、卤素取代C1~C3烷基取代苯基、杂芳基、C1~C5烷基。
作为优选,R1为H、甲基、甲氧基、卤素、硝基;R2为苯基、甲基取代苯基、甲氧基取代苯基、卤素取代苯基、卤素取代甲基取代苯基、噻吩基、甲基、丁基。
作为进一步优选,当R2=Ph时,R1为6-Me;6-MeO;6-F;6-Cl;6-Br;7-MeO;7-F;7-Cl;7-NO2;8-Me;8-F中的一种。当R1=H时,R2为Ph;p-MePh;o-MeOPh;m-MeOPh;p-FPh;m-BrPh;p-CF3Ph;2-thienyl;Me;t-Bu中的一种。
一种1,2,4-苯并三嗪衍生物的制备方法,包括以下步骤:
将式II结构所示的1-(三氟甲烷磺酰基)-1H-苯并三唑化合物、式III结构所示的锍盐化合物、缚酸剂(比如碳酸钾等)加入到反应溶剂(比如异丙醇等)中,在反应环境中,形成反应体系,反应完成后经后处理得到式I所示结构的1,2,4-苯并三嗪衍生物。
其中,R1为H、C1~C3烷基、C1~C3烷氧基、卤素、硝基;R2为苯基、C1~C3烷基取代苯基、C1~C3烷氧基取代苯基、卤素取代苯基、卤素取代C1~C3烷基取代苯基、杂芳基、C1~C5烷基。
作为优选,R1为H、甲基、甲氧基、卤素、硝基;R2为苯基、甲基取代苯基、甲氧基取代苯基、卤素取代苯基、卤素取代甲基取代苯基、噻吩基、甲基、丁基。
作为更进一步优选,当R2=Ph时,R1为6-Me;6-MeO;6-F;6-Cl;6-Br;7-MeO;7-F;7-Cl;7-NO2;8-Me;8-F中的一种。当R1=H时,R2为Ph;p-MePh;o-MeOPh;m-MeOPh;p-FPh;m-BrPh;p-CF3Ph;2-thienyl;Me;t-Bu中的一种。
本发明涉及反应的具体合成路线如下所示:
该制备方法通过锍盐III在以碳酸钾为例的缚酸剂的作用下生成硫叶立德,并进一步进攻1-(三氟甲烷磺酰基)-1H-苯并三唑II进行开环。紧接着,氮负进攻硫叶立德α碳,离去二甲硫醚进行闭环。最后,碱性条件下脱三氟甲烷亚磺酸得到芳构化的1,2,4-苯并三嗪衍生物I。
作为优选,反应温度为20-40摄氏度。
作为优选,所述的反应环境为空气氛围,室温条件下进行搅拌。
作为优选,所述的式II结构所示的1-(三氟甲烷磺酰基)-1H-苯并三唑化合物、式III结构所示的锍盐化合物、缚酸剂(碳酸钾)的摩尔比为1:1~2:1~2;作为进一步优选,所述摩尔比为1:(1~1.5):(1~1.5);作为更进一步优选,所述摩尔比为1:1.2:1.2。
作为优选,所述缚酸剂选自碳酸钾、一水氢氧化锂、碳酸铯中的一种或多种。作为进一步优选,所述述缚酸剂选自碳酸钾。
所述反应溶剂为异丙醇、甲醇、乙醇、正丙醇、N,N-二甲基甲酰胺、丙酮中的一种或多种。
作为优选,所述反应溶剂为异丙醇。所述的反应中异丙醇用量为每1equiv加1.0mL。
所述的反应体系的反应时间为5h~10h。
所述的后处理:柱层析分离。
所述的柱层析分离采用硅胶柱层析分离。
同现有技术相比,本发明具有如下优点:
1、与传统的构建1,2,4-苯并三嗪骨架的方法不同,该方法无需进行事先官能团的预组装。直接通过硫叶立德和1-(三氟甲烷磺酰基)-1H-苯并三唑的环加成串联反应即可实现。
2、反应未用到较为昂贵的过渡金属催化剂,原料廉价,绿色环保。
3、反应条件温和,操作简单,底物适用范围广,官能团兼容性好,具有良好应用前景;故本发明具有较大的理论。
具体实施方式
实施例1
空气氛围下,在10mL的Schlenk管中,依次加入1-(三氟甲烷磺酰基)-1H-苯并三唑1a(50.2mg,0.2mmol,1.0eq.),2mL的异丙醇,硫叶立德盐2a(62.4mg,0.24mmol,1.2eq.)以及K2CO3(33.2mg,0.24mmol,1.2eq.)。反应8小时左右直至原料完全消失。柱层析快速分离提纯(石油醚:乙酸乙酯=8:1作为展开剂),减压浓缩后得40.0mg的黄色固体3a,产率85%。1HNMR(400MHz,CDCl3)δ8.69(d,J=8.3Hz,1H),8.26(d,J=8.4Hz,1H),8.14(d,J=7.4Hz,3H),8.06(t,J=7.5Hz,1H),7.69(t,J=7.3Hz,1H),7.55(t,J=7.6Hz,2H).13C NMR(101MHz,CDCl3)δ190.58,158.08,147.61,140.34,136.67,135.14,134.27,132.77,131.25,129.81,129.71,128.70.HRMS(ESI)calcd.for C14H10N3O[M+H+]:236.0810,found:236.0812.
反应式如下:
实施例2
除用结构式1b所示的6-甲基-1-(三氟甲烷磺酰基)-1H-苯并三唑代替实施例1中结构式1a所示的1-(三氟甲烷磺酰基)-1H-苯并三唑外,其余操作步骤同实施例1,分离得到黄色固体3b,产率:77%。1H NMR(400MHz,CDCl3)δ8.54(d,J=8.7Hz,1H),8.15–8.10(m,2H),7.99(s,1H),7.86(dd,J=8.7,1.7Hz,1H),7.71–7.64(m,1H),7.57–7.50(m,2H),2.71(s,3H).13C NMR(101MHz,CDCl3)δ190.79,158.31,148.66,146.66,140.76,135.36,135.30,134.19,131.28,129.32,128.68,127.91,22.84.HRMS(ESI)calcd.for C15H12N3O[M+H+]:250.0975,found:250.0970.
反应式如下:
实施例3
除用结构式1c所示的6-甲氧基-1-(三氟甲烷磺酰基)-1H-苯并三唑代替实施例1中结构式1a所示的1-(三氟甲烷磺酰基)-1H-苯并三唑外,其余操作步骤同实施例1,分离得到黄色固体3c,产率:54%。1H NMR(400MHz,CDCl3)δ8.48(d,J=9.3Hz,1H),8.17–8.10(m,2H),7.71–7.65(m,1H),7.63(dd,J=9.3,2.6Hz,1H),7.58–7.50(m,2H),7.39(d,J=2.6Hz,1H),4.06(s,3H).13C NMR(101MHz,CDCl3)δ190.94,165.89,158.49,145.26,143.77,135.34,134.15,131.28,131.08,128.67,127.56,105.04,56.69.HRMS(ESI)calcd.forC15H12N3O2[M+H+]:266.0924,found:266.0934.
反应式如下:
实施例4
除用结构式1d所示的6-氟-1-(三氟甲烷磺酰基)-1H-苯并三唑代替实施例1中结构式1a所示的1-(三氟甲烷磺酰基)-1H-苯并三唑外,其余操作步骤同实施例1,分离得到黄色固体3d,产率:50%。1H NMR(400MHz,CDCl3)δ8.78–8.70(m,1H),8.14–8.08(m,2H),7.86–7.79(m,2H),7.73–7.66(m,1H),7.59–7.51(m,2H).13C NMR(101MHz,CDCl3)δ190.32,166.66(d,J=263.9Hz),158.40,145.63,142.32(d,J=14.7Hz),135.01,134.45,132.97(d,J=10.9Hz),131.25,128.80,124.23(d,J=27.2Hz),112.86(d,J=21.9Hz).HRMS(ESI)calcd.for C14H9FN3O[M+H+]:254.0724,found:254.0709.
反应式如下:
实施例5
除用结构式1e所示的6-氯-1-(三氟甲烷磺酰基)-1H-苯并三唑代替实施例1中结构式1a所示的1-(三氟甲烷磺酰基)-1H-苯并三唑外,其余操作步骤同实施例1,分离得到黄色固体3e,产率:60%。1H NMR(400MHz,CDCl3)δ8.64(d,J=9.0Hz,1H),8.23(d,J=2.1Hz,1H),8.13–8.08(m,2H),7.98(dd,J=9.1,2.2Hz,1H),7.73–7.65(m,1H),7.55(t,J=7.8Hz,2H).13C NMR(101MHz,CDCl3)δ190.20,158.51,146.23,143.35,140.83,134.94,134.45,134.19,131.23,131.17,128.78,128.38.HRMS(ESI)calcd.for C14H9ClN3O[M+H+]:270.0429,found:270.0423.
反应式如下:
实施例6
除用结构式1f所示的6-溴-1-(三氟甲烷磺酰基)-1H-苯并三唑代替实施例1中结构式1a所示的1-(三氟甲烷磺酰基)-1H-苯并三唑外,其余操作步骤同实施例1,分离得到黄色固体3f,产率:87%。1H NMR(400MHz,CDCl3)δ8.55(d,J=9.1Hz,1H),8.44(d,J=2.0Hz,1H),8.15–8.08(m,3H),7.73–7.66(m,1H),7.58–7.52(m,2H).13C NMR(101MHz,CDCl3)δ190.15,158.41,146.38,140.81,136.67,134.92,134.44,132.17,131.89,131.22,130.98,128.77.HRMS(ESI)calcd.for C14H9BrN3O[M+H+]:313.9924,found:313.9927.
反应式如下:
实施例7
除用结构式1g所示的5-甲氧基-1-(三氟甲烷磺酰基)-1H-苯并三唑代替实施例1中结构式1a所示的1-(三氟甲烷磺酰基)-1H-苯并三唑外,其余操作步骤同实施例1,分离得到黄色固体3g,产率:50%。1H NMR(400MHz,CDCl3)δ8.17–8.10(m,3H),7.82(d,J=2.7Hz,1H),7.74(dd,J=9.3,2.8Hz,1H),7.69–7.63(m,1H),7.57–7.50(m,2H),4.10(s,3H).13CNMR(101MHz,CDCl3)δ190.71,162.69,157.15,149.12,137.68,135.57,134.00,131.48,131.33,130.86,128.61,105.05,56.60.HRMS(ESI)calcd.for C15H12N3O2[M+H+]:266.0924,found:266.0935.
反应式如下:
实施例8
除用结构式1h所示的5-氟-1-(三氟甲烷磺酰基)-1H-苯并三唑代替实施例1中结构式1a所示的1-(三氟甲烷磺酰基)-1H-苯并三唑外,其余操作步骤同实施例1,分离得到黄色固体3h,产率:60%。1H NMR(400MHz,CDCl3)δ8.35–8.27(m,2H),8.15–8.09(m,2H),7.93(ddd,J=9.3,8.1,2.8Hz,1H),7.73–7.66(m,1H),7.59–7.51(m,2H).13C NMR(101MHz,CDCl3)δ190.25,163.64(d,J=260.3Hz),157.98(d,J=3.3Hz),148.09(d,J=12.4Hz),137.95,135.11,134.36,132.61(d,J=9.5Hz),131.27,128.75,128.09(d,J=27.1Hz),112.80(d,J=22.2Hz).HRMS(ESI)calcd.for C14H9FN3O[M+H+]:254.0724,found:254.0720.
反应式如下:
实施例9
除用结构式1i所示的5-氯-1-(三氟甲烷磺酰基)-1H-苯并三唑代替实施例1中结构式1a所示的1-(三氟甲烷磺酰基)-1H-苯并三唑外,其余操作步骤同实施例1,分离得到黄色固体3i,产率:69%。1H NMR(400MHz,CDCl3)δ8.68(d,J=2.2Hz,1H),8.22(d,J=9.0Hz,1H),8.14–8.10(m,2H),8.06(dd,J=9.1,2.3Hz,1H),7.73–7.67(m,1H),7.59–7.52(m,2H).13C NMR(101MHz,CDCl3)δ190.17,158.15,147.50,139.10,138.98,137.97,135.03,134.41,131.27,128.78,128.39.HRMS(ESI)calcd.for C14H9ClN3O[M+H+]:270.0429,found:270.0427.
反应式如下:
实施例10
除用结构式1j所示的5-硝基-1-(三氟甲烷磺酰基)-1H-苯并三唑代替实施例1中结构式1a所示的1-(三氟甲烷磺酰基)-1H-苯并三唑外,其余操作步骤同实施例1,分离得到黄色固体3j,产率:10%。1H NMR(400MHz,CDCl3)δ9.59(d,J=2.4Hz,1H),8.86(dd,J=9.3,2.5Hz,1H),8.44(d,J=9.3Hz,1H),8.13–8.06(m,2H),7.75–7.68(m,1H),7.60–7.54(m,2H).13C NMR(101MHz,CDCl3)δ189.59,159.19,149.08,146.47,142.29,134.84,134.58,132.22,131.22,129.59,128.97,126.34.HRMS(ESI)calcd.for C14H9N4O3[M+H+]:281.0669,found:281.0660.
反应式如下:
实施例11
除用结构式1k所示的4-甲基-1-(三氟甲烷磺酰基)-1H-苯并三唑代替实施例1中结构式1a所示的1-(三氟甲烷磺酰基)-1H-苯并三唑外,其余操作步骤同实施例1,分离得到黄色固体3k,产率:98%。1H NMR(400MHz,CDCl3)δ8.17–8.12(m,2H),8.09–8.04(m,1H),8.02–7.97(m,1H),7.84–7.79(m,1H),7.69–7.63(m,1H),7.56–7.50(m,2H),3.10(s,3H).13CNMR(101MHz,CDCl3)δ190.78,157.95,146.85,140.93,139.35,136.79,135.33,134.17,132.45,131.29,128.68,127.42,17.01.HRMS(ESI)calcd.for C15H12N3O[M+H+]:250.0975,found:250.0969.
反应式如下:
实施例12
除用结构式1l所示的4-氟-1-(三氟甲烷磺酰基)-1H-苯并三唑代替实施例1中结构式1a所示的1-(三氟甲烷磺酰基)-1H-苯并三唑外,其余操作步骤同实施例1,分离得到黄色固体3l,产率:76%。1H NMR(400MHz,CDCl3)δ8.16–8.05(m,4H),7.76–7.66(m,2H),7.59–7.51(m,2H).13C NMR(101MHz,CDCl3)δ190.10,158.78(d,J=52.0Hz),156.35,141.0,139.20(d,J=12.8Hz),136.72(d,J=8.2Hz),134.89,134.48,131.24,128.78,125.64(d,J=5.2Hz),116.48(d,J=17.6Hz).HRMS(ESI)calcd.for C14H9FN3O[M+H+]:254.0724,found:254.0700.
反应式如下:
实施例13
除用结构式2b所示的锍盐代替实施例1中结构式2a所示的锍盐外,其余操作步骤同实施例1,分离得到黄色固体3m,产率:50%。1H NMR(400MHz,CDCl3)δ8.69(d,J=8.4Hz,1H),8.25(d,J=8.4Hz,1H),8.17–8.09(m,1H),8.08–8.00(m,3H),7.35(d,J=8.0Hz,2H),2.47(s,3H).13C NMR(101MHz,CDCl3)δ190.23,158.44,147.65,145.50,140.44,136.59,132.71,132.62,131.46,129.87,129.76,129.49,22.05.HRMS(ESI)calcd.for C15H12N3O[M+H+]:250.0975,found:250.0970.
反应式如下:
实施例14
除用结构式2c所示的锍盐代替实施例1中结构式2a所示的锍盐外,其余操作步骤同实施例1,分离得到黄色固体3n,产率:70%。1H NMR(400MHz,CDCl3)δ8.64(d,J=8.4Hz,1H),8.23(d,J=8.5Hz,1H),8.09(t,J=7.6Hz,1H),8.04–7.93(m,2H),7.61(t,J=7.8Hz,1H),7.16(t,J=7.5Hz,1H),6.96(d,J=8.4Hz,1H),3.42(s,3H).13C NMR(101MHz,CDCl3)δ192.08,159.73,159.32,147.20,140.60,136.18,135.27,132.09,131.39,129.67,129.63,126.32,121.24,111.93,55.72.HRMS(ESI)calcd.for C15H12N3O2[M+H+]:266.0924,found:266.0905.
反应式如下:
实施例15
除用结构式2d所示的锍盐代替实施例1中结构式2a所示的锍盐外,其余操作步骤同实施例1,分离得到黄色固体3o,产率:80%。1H NMR(400MHz,CDCl3)δ8.69(d,J=8.5Hz,1H),8.25(d,J=8.5Hz,1H),8.13(t,J=7.7Hz,1H),8.06(t,J=7.6Hz,1H),7.71(s,1H),7.62(d,J=7.6Hz,1H),7.43(t,J=7.9Hz,1H),7.23(dd,J=8.2,2.5Hz,1H),3.90(s,3H).13C NMR(101MHz,CDCl3)δ190.46,159.92,158.29,147.67,140.36,136.67,136.45,132.72,129.89,129.75,129.71,124.56,121.16,114.72,55.71.HRMS(ESI)calcd.forC15H12N3O2[M+H+]:266.0924,found:266.0940.
反应式如下:
实施例16
除用结构式2e所示的锍盐代替实施例1中结构式2a所示的锍盐外,其余操作步骤同实施例1,分离得到黄色固体3p,产率:85%。1H NMR(400MHz,CDCl3)δ8.69(dd,J=8.5,0.8Hz,1H),8.28–8.20(m,3H),8.17–8.12(m,1H),8.10–8.04(m,1H),7.26–7.19(m,2H).13CNMR(101MHz,CDCl3)δ188.87,166.52(d,J=257.1Hz),157.86,144.03(d,J=731.1Hz),136.78,134.11,133.50(d,J=121.6Hz),131.64(d,J=2.9Hz),129.87,129.74,116.14,115.92.HRMS(ESI)calcd.for C14H9FN3O[M+H+]:254.0724,found:254.0704.
反应式如下:
实施例17
除用结构式2f所示的锍盐代替实施例1中结构式2a所示的锍盐外,其余操作步骤同实施例1,分离得到黄色固体3q,产率:73%。1H NMR(400MHz,CDCl3)δ8.70(d,J=8.5Hz,1H),8.33–8.24(m,2H),8.16(t,J=7.6Hz,1H),8.12–8.05(m,2H),7.81(d,J=8.0Hz,1H),7.43(t,J=7.9Hz,1H).13C NMR(101MHz,CDCl3)δ189.14,157.41,147.72,140.41,137.04,137.01,136.86,133.99,133.07,130.26,129.91,129.81,122.94.HRMS(ESI)calcd.forC14H9BrN3O[M+H+]:313.9924,found:313.9915.
反应式如下:
实施例18
除用结构式2g所示的锍盐代替实施例1中结构式2a所示的锍盐外,其余操作步骤同实施例1,分离得到黄色固体3r,产率:99%。1H NMR(400MHz,CDCl3)δ8.71(d,J=8.4Hz,1H),8.29(t,J=8.1Hz,3H),8.20–8.14(m,1H),8.13–8.06(m,1H),7.82(d,J=8.2Hz,2H).13C NMR(101MHz,CDCl3)δ189.54,157.15,147.74,140.40,138.10,136.96,135.18(q,J=32.8Hz),133.24,131.59,129.93,129.82,125.70(q,J=3.7Hz),123.66(q,J=272.7Hz).HRMS(ESI)calcd.for C15H9F3N3O[M+H+]:304.0692,found:304.0702.
反应式如下:
实施例19
除用结构式2h所示的锍盐代替实施例1中结构式2a所示的锍盐外,其余操作步骤同实施例1,分离得到黄色固体3s,产率:82%。1H NMR(400MHz,CDCl3)δ8.69(d,J=8.4Hz,1H),8.41(d,J=3.9Hz,1H),8.32(d,J=8.5Hz,1H),8.15(t,J=7.6Hz,1H),8.08(t,J=15.3Hz,1H),7.88(d,J=4.9Hz,1H),7.29–7.25(m,1H).13C NMR(101MHz,CDCl3)δ181.04,156.39,147.82,140.99,140.59,137.94,137.30,136.75,133.09,129.97,129.80,128.55.HRMS(ESI)calcd.for C12H8N3OS[M+H+]:242.0383,found:242.0400.
反应式如下:
实施例20
除用结构式2i所示的锍盐代替实施例1中结构式2a所示的锍盐外,其余操作步骤同实施例1,分离得到黄色固体3t,产率:64%。1H NMR(400MHz,CDCl3)δ8.68(d,J=8.4Hz,1H),8.31(d,J=8.5Hz,1H),8.14(t,J=7.6Hz,1H),8.07(t,J=7.6Hz,1H),3.08(s,3H).13CNMR(101MHz,CDCl3)δ196.96,155.13,147.87,140.79,136.68,133.22,130.26,129.74,27.76.HRMS(ESI)calcd.for C9H8N3O[M+H+]:174.0662,found:174.0661.
反应式如下:
实施例21
除用结构式2j所示的锍盐代替实施例1中结构式2a所示的锍盐外,其余操作步骤同实施例1,分离得到黄色固体3u,产率:85%。1H NMR(400MHz,CDCl3)δ8.65(dd,J=8.5,1.0Hz,1H),8.28(d,J=8.4Hz,1H),8.13–8.07(m,1H),8.05–8.00(m,1H),1.76(s,9H).13CNMR(101MHz,CDCl3)δ162.31,153.54,147.82,140.57,136.43,132.75,129.90,129.71,84.58,28.21.HRMS(ESI)calcd.for C12H14N3O[M+H+]:216.1131,found:216.1130.
反应式如下:
实施例22~28
与实施例1其余条件相同,不同之处在于碱和反应溶剂:
实施例 | 碱 | 反应溶剂 | 收率 |
实施例22 | 一水氢氧化锂 | N,N-二甲基甲酰胺 | 49% |
实施例23 | 碳酸铯 | N,N-二甲基甲酰胺 | 53% |
实施例24 | 碳酸钾 | N,N-二甲基甲酰胺 | 75% |
实施例25 | 碳酸钾 | 丙酮 | 69% |
实施例26 | 碳酸钾 | 正丙醇 | 75% |
实施例27 | 碳酸钾 | 甲醇 | 78% |
实施例28 | 碳酸钾 | 乙醇 | 76% |
由上述实施例可知,采用本发明的方法制备1,2,4-苯并三嗪衍生物,收率较高,且没有使用毒性和危险溶剂等。
Claims (9)
2.根据权利要求1所述的1,2,4-苯并三嗪衍生物的制备方法,其特征在于,R1为H、甲基、甲氧基、卤素、硝基;R2为苯基、甲基取代苯基、甲氧基取代苯基、卤素取代苯基、卤素取代甲基取代苯基、噻吩基、甲基、丁基。
4.根据权利要求1所述的1,2,4-苯并三嗪衍生物的制备方法,其特征在于,所述缚酸剂选自碳酸钾、一水氢氧化锂、碳酸铯中的一种或多种。
5.根据权利要求1所述的1,2,4-苯并三嗪衍生物的制备方法,其特征在于,所述的式II结构所示的1-(三氟甲烷磺酰基)-1H-苯并三唑化合物、式III结构所示的锍盐化合物、缚酸剂的摩尔比为1:1~2:1~2。
6.根据权利要求1所述的1,2,4-苯并三嗪衍生物的制备方法,其特征在于,所述反应溶剂为异丙醇、甲醇、乙醇、正丙醇、N,N-二甲基甲酰胺、丙酮中的一种或多种。
7.根据权利要求1所述的1,2,4-苯并三嗪衍生物的制备方法,其特征在于,反应温度为20~40摄氏度。
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