CN105237534B - 一种吡唑并吡啶衍生物及其制备方法和应用 - Google Patents
一种吡唑并吡啶衍生物及其制备方法和应用 Download PDFInfo
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Abstract
本发明提供了一种吡唑并吡啶衍生物及其制备方法和应用。所述的吡唑并吡啶衍生物是2‑(2‑羟基异丙基)‑吡唑并[1,5‑a]吡啶‑3‑甲叉基丙二腈。其制备方法:是以1‑氨基吡啶碘化物为起始原料,与4‑羟基‑4‑甲基‑2‑戊炔酸甲酯反应得到2‑(2‑羟基异丙基)‑吡唑并[1,5‑a]吡啶‑3‑甲酸甲酯,然后经氢化铝锂还原,再经二氧化锰氧化得到2‑(2‑羟基异丙基)‑吡唑并[1,5‑a]吡啶‑3‑甲醛,再与丙二腈反应制得2‑(2‑羟基异丙基)‑吡唑并[1,5‑a]吡啶‑3‑甲叉基丙二腈。本发明提供的吡唑并吡啶衍生物作为荧光探针能定量检测Hg2+的含量,而且显示了高的灵敏度和选择性,检测过程简单、快速,检测结果准确。
Description
技术领域
本发明涉及杂环化合物技术领域,具体属于一种吡唑并吡啶衍生物及其制备方法,以及该化合物在检测Hg2+中的应用。
背景技术
汞是一种毒性极强的重金属。在现代工业生产中,汞的用途非常广泛,例如有色金属的提取,汞灯、电极、科学仪器、以及药物的制造等。由于汞的挥发性导致其在自然界中普遍存在,严重危害人体健康。汞及其化合物可以通过皮肤、消化道或呼吸道直接进入人体,也可以通过食物链进入人体,从而毒害人的中枢神经系统、肾脏、口腔以及皮肤等。因此,Hg2+的定量检测在药品、食品、临床和环境检测方面是非常重要的。
目前,常用的Hg2+的检测方法有:分光光度法、原子发射光谱法、原子吸收光谱法、氢化物发生-原子荧光光谱法、X射线荧光光谱法、等离子体感应光谱谱法、电化学方法和荧光法等,其中荧光法由于具有操作简单、灵敏度高、能够实时、在线、原位检测等优点,从众多Hg2+检测方法中脱颖而出,成为目前被广泛采用的检测Hg2+的方法。在过去的几十年中,人们利用Hg2+的配位作用以及Hg2+参与的一些特殊反应,如诱导罗丹明内酰胺环开环反应、脱硫(硒)反应和加汞化反应等,设计合成了许多检测Hg2+的荧光探针。但是大多数文献报道的汞离子荧光探针存在制备方法繁琐、操作复杂、有时需要借助掩蔽剂消除干扰等缺点,因此,设计合成在环境生命体系中能高灵敏度、高选择性地检测汞离子的荧光探针,仍是该领域的研究热点。
发明内容
本发明的目的是提供一种吡唑并吡啶衍生物及其制备方法,该方法原料易得,制备方便。
本发明的另一目的是提供吡唑并吡啶衍生物的应用,将该化合物作为荧光探针定量检测Hg2+。
本发明提供的一种吡唑并吡啶衍生物,是2-(2-羟基异丙基)-吡唑并[1,5-a]吡啶-3-甲叉基丙二腈,其结构式为:
本发明提供的一种吡唑并吡啶衍生物的制备方法,是以1-氨基吡啶碘化物为起始原料,与4-羟基-4-甲基-2-戊炔酸甲酯反应得到2-(2-羟基异丙基)-吡唑并[1,5-a]吡啶-3-甲酸甲酯,然后经氢化铝锂还原,再经二氧化锰氧化得到2-(2-羟基异丙基)-吡唑并[1,5-a]吡啶-3-甲醛,再与丙二腈反应制得2-(2-羟基异丙基)-吡唑并[1,5-a]吡啶-3-甲叉基丙二腈,其制备过程的反应式如下:
本发明的制备方法的步骤如下:
(1)2-(2-羟基异丙基)-吡唑并[1,5-a]吡啶-3-甲酸甲酯的制备:将4-羟基-4-甲基-2-戊炔酸甲酯溶于丙酮中,然后加入等摩尔量的1-氨基吡啶碘化物和1.2倍摩尔量的碳酸钾,加热回流反应8小时,冷却,过滤掉碳酸钾,滤液减压浓缩,残留物柱色谱分离得2-(2-羟基异丙基)-吡唑并[1,5-a]吡啶-3-甲酸甲酯。
(2)2-(2-羟基异丙基)-吡唑并[1,5-a]吡啶-3-甲醛的制备:将2-(2-羟基异丙基)-吡唑并[1,5-a]吡啶-3-甲酸甲酯溶于四氢呋喃中,冰水浴冷却至0℃,分批加入等摩尔量的氢化铝锂,控制加料速度使反应体系的温度保持在0±2℃。加完后室温搅拌反应16小时。然后往反应体系中缓慢滴加水至没有气体产生为止,过滤,滤液减压浓缩得还原产物;将所得还原产物溶于乙腈中,加入3倍摩尔量的二氧化锰,加热回流反应12小时。冷却,抽滤掉二氧化锰,滤液减压浓缩,残留物柱色谱分离得2-(2-羟基异丙基)-吡唑并[1,5-a]吡啶-3-甲醛。
(3)将2-(2-羟基异丙基)-吡唑并[1,5-a]吡啶-3-甲醛和等摩尔量的丙二腈加到水中,再加入0.1倍摩尔量的1-甲基咪唑,室温搅拌反应12小时,过滤得2-(2-羟基异丙基)-吡唑并[1,5-a]吡啶-3-甲叉基丙二腈。
本发明的吡唑并吡啶衍生物可作为荧光探针在定量检测Hg2+中应用。
本发明提供的一种吡唑并吡啶衍生物定量检测Hg2+的方法,包括如下步骤:
(1)用乙腈配制1mM 2-(2-羟基异丙基)-吡唑并[1,5-a]吡啶-3-甲叉基丙二腈的荧光探针储备液;用蒸馏水配制0.1mM的Hg2+溶液。
(2)将2mL HEPES缓冲液(pH=7.0)和50μL荧光探针储备液加入荧光比色皿中,在荧光分光光度仪上测定探针的起始荧光强度(F0),然后逐渐加入不同体积的Hg2+水溶液,在荧光分光光度仪上测定其荧光强度(F),随着Hg2+的加入,探针在366nm和430nm处的荧光强度逐渐减弱,加到荧光强度基本不发生变化为止;以Hg2+浓度[Hg2+]为横坐标,探针在366nm处的相对荧光强度(F0-F)为纵坐标,绘制图并进行线性拟合,得到该探针的最佳线性响应范围为0.05-0.4μM,回归方程为:F0-F=8.42×[Hg2+]+31.25,线性系数为R2=0.9894。
(3)在盛有2mL HEPES缓冲液(pH=7.0)和50μL荧光探针储备液的荧光比色皿中,加入VμL待测样品溶液,在荧光分光光度仪上测定探针在366nm处的荧光强度F,将测得的荧光强度F代入步骤(2)的线性回归方程,即可求得待测样品溶液中Hg2+的浓度。
经实验验证,其他金属离子不干扰体系对Hg2+的检测。
优点与有益效果:
(1)本发明提供的吡唑并吡啶衍生物结构新颖、制备方便。
(2)本发明的检测方法对Hg2+有高的灵敏度和选择性,不受其他金属离子干扰。
附图说明:
图1 2-(2-羟基异丙基)-吡唑并[1,5-a]吡啶-3-甲叉基丙二腈的X-射线晶体衍射结构图
图2 2-(2-羟基异丙基)-吡唑并[1,5-a]吡啶-3-甲叉基丙二腈与Hg2+作用的荧光滴定图
图3 2-(2-羟基异丙基)-吡唑并[1,5-a]吡啶-3-甲叉基丙二腈荧光探针检测Hg2+的工作曲线
图4其他金属离子对2-(2-羟基异丙基)-吡唑并[1,5-a]吡啶-3-甲叉基丙二腈检测Hg2+的荧光干扰图
具体实施方式
实施例1
2-(2-羟基异丙基)-吡唑并[1,5-a]吡啶-3-甲叉基丙二腈的制备
(1)2-(2-羟基异丙基)-吡唑并[1,5-a]吡啶-3-甲酸甲酯的制备:将7.1g(50mmol)4-羟基-4-甲基-2-戊炔酸甲酯溶于50mL丙酮中,然后加入11.1g(50mmol)1-氨基吡啶碘化物和8.28g(60mmol)碳酸钾,加热回流反应8小时,冷却,过滤掉碳酸钾,滤液减压浓缩,残留物柱色谱分离得8.33g 2-(2-羟基异丙基)-吡唑并[1,5-a]吡啶-3-甲酸甲酯,收率71.2%。1HNMR(300MHz,CDCl3):δ8.43(d,J=6.9,1H),8.02(d,J=9.0,1H),7.39(t,J=8.1,1H),6.92(t,J=6.9,1H),6.40(br,1H),3.96(s,3H),1.69(s,6H).
(2)2-(2-羟基异丙基)-吡唑并[1,5-a]吡啶-3-甲醛的制备:将2.34g(10mmol)2-(2-羟基异丙基)-吡唑并[1,5-a]吡啶-3-甲酸甲酯溶于20mL四氢呋喃中,冰水浴冷却至0℃,分批加入0.38g(10mmol)氢化铝锂,控制加料速度使反应体系的温度保持在0±2℃。加完后室温搅拌反应16小时。然后往反应体系中缓慢滴加水至没有气体产生为止,过滤,滤液减压浓缩得还原产物;将所得还原产物溶于20mL乙腈中,加入2.61g(30mmol)二氧化锰,加热回流反应12小时。冷却,抽滤掉二氧化锰,滤液减压浓缩,残留物柱色谱分离得1.33g 2-(2-羟基异丙基)-吡唑并[1,5-a]吡啶-3-甲醛,产率65.2%。1H NMR(300MHz,CDCl3):δ10.11(s,1H),8.50(d,J=6.9,1H),7.97(d,J=9.0,1H),7.51(t,J=8.1,1H),7.02(t,J=6.9,1H),1.63(s,6H).
(3)将0.408g(2mmol)2-(2-羟基异丙基)-吡唑并[1,5-a]吡啶-3-甲醛和0.132g(2mmol)丙二腈加到2mL水中,再加入0.016g(0.2mmol)1-甲基咪唑,室温搅拌反应12小时,过滤,干燥得0.368g 2-(2-羟基异丙基)-吡唑并[1,5-a]吡啶-3-甲叉基丙二腈,产率73%。
2-(2-羟基异丙基)-吡唑并[1,5-a]吡啶-3-甲叉基丙二腈经1H NMR、13C NMR和X-射线晶体衍射表征,结果如下:
1H NMR(300MHz,CDCl3):δ8.79(s,1H),8.51(d,J=6.9,1H),7.98(d,J=8.7,1H),7.58(t,J=7.8,1H),7.08(t,J=6.9,1H),2.28(s,1H),1.73(s,6H).
13C NMR(75MHz,CDCl3):δ164.7,154.4,140.2,130.9,129.7,121.2,116.3,115.9,115.5,104.4,76.2,73.1,32.3.
晶体参数:化学式C14H12N4O,分子量:252.28,单斜晶系,空间群Cc,晶胞参数 α=90.00°,β=122.387(8)°,γ=90.00°, Dx=1.312g/cm3,Z=4,R1=0.0303,wR2=0.0640,S=1.032。
X-射线晶体衍射结构图见图1。
实施例2
2-(2-羟基异丙基)-吡唑并[1,5-a]吡啶-3-甲叉基丙二腈作为荧光探针定量检测Hg2+含量的实验
(1)用乙腈配制1mM 2-(2-羟基异丙基)-吡唑并[1,5-a]吡啶-3-甲叉基丙二腈的荧光探针储备液;用蒸馏水配制0.1mM的Hg2+溶液。
(2)将2mL HEPES缓冲液(pH=7.0)和50μL荧光探针储备液加入荧光比色皿中,在荧光分光光度仪上测定探针的起始荧光强度(F0),然后每隔10s加入1μL Hg2+水溶液,在荧光分光光度仪上测定其荧光强度(F),随着Hg2+的加入,探针在366nm和430nm处的荧光强度逐渐减弱(见图2),加到荧光强度基本不发生变化为止;以Hg2+浓度[Hg2+]为横坐标,探针在366nm处的相对荧光强度(F0-F)为纵坐标,绘制图并进行线性拟合,得到该探针的最佳线性响应范围为0.05-0.4μM,回归方程为:F0-F=8.42×[Hg2+]+31.25(见图3),线性系数为R2=0.9894。
(3)在盛有2mL HEPES缓冲液(pH=7.0)和50μL荧光探针储备液的荧光比色皿中,加入VμL待测样品溶液,在荧光分光光度仪上测定探针在366nm处的荧光强度F,将测得的荧光强度F代入步骤(2)的线性回归方程,即可求得待测样品溶液中Hg2+的浓度。
实施例3
其他金属离子对2-(2-羟基异丙基)-吡唑并[1,5-a]吡啶-3-甲叉基丙二腈荧光探针检测Hg2+的干扰实验
在不同的荧光比色皿中,分别加入2mL HEPES缓冲液(pH=7.0)和50μL2-(2-羟基异丙基)-吡唑并[1,5-a]吡啶-3-甲叉基丙二腈的荧光储备液,再分别加入其他金属离子水溶液,包括K+、Na+、Ca2+、Mg2+、Zn2+、Fe2+、Fe3+、Ni2+、Cd2+、Cr3+、Co2+、Mn2+、Pb2+、Cu2+,使其最终浓度为15μM,在荧光分光光度仪上测定荧光强度,然后再分别加入Hg2+水溶液,使其最终浓度为0.75μM,在荧光分光光度仪上测定荧光强度,绘制加入不同金属离子后在366nm处相对荧光强度的柱状图,见图4。实验证明,其他金属离子不干扰体系对Hg2+的检测。
Claims (3)
1.一种吡唑并吡啶衍生物,其特征在于,它是2-(2-羟基异丙基)-吡唑并[1,5-a]吡啶-3-甲叉基丙二腈,其结构式为:
2.如权利要求1所述的吡唑并吡啶衍生物的制备方法,其特征在于,包括如下步骤:
(1)2-(2-羟基异丙基)-吡唑并[1,5-a]吡啶-3-甲酸甲酯的制备:将4-羟基-4-甲基-2-戊炔酸甲酯溶于丙酮中,然后加入等摩尔量的1-氨基吡啶碘化物和1.2倍摩尔量的碳酸钾,加热回流反应8小时,冷却,过滤掉碳酸钾,滤液减压浓缩,残留物柱色谱分离得2-(2-羟基异丙基)-吡唑并[1,5-a]吡啶-3-甲酸甲酯;
(2)2-(2-羟基异丙基)-吡唑并[1,5-a]吡啶-3-甲醛的制备:将2-(2-羟基异丙基)-吡唑并[1,5-a]吡啶-3-甲酸甲酯溶于四氢呋喃中,冰水浴冷却至0℃,分批加入等摩尔量的氢化铝锂,控制加料速度使反应体系的温度保持在0±2℃;加完后室温搅拌反应16小时,然后往反应体系中缓慢滴加水至没有气体产生为止,过滤,滤液减压浓缩得还原产物;将所得还原产物溶于乙腈中,加入3倍摩尔量的二氧化锰,加热回流反应12小时;冷却,抽滤掉二氧化锰,滤液减压浓缩,残留物柱色谱分离得2-(2-羟基异丙基)-吡唑并[1,5-a]吡啶-3-甲醛;
(3)将2-(2-羟基异丙基)-吡唑并[1,5-a]吡啶-3-甲醛和等摩尔量的丙二腈加到水中,再加入0.1倍摩尔量的1-甲基咪唑,室温搅拌反应12小时,过滤得2-(2-羟基异丙基)-吡唑并[1,5-a]吡啶-3-甲叉基丙二腈。
3.一种如权利要求1所述的吡唑并吡啶衍生物作为荧光探针在检测Hg2+中的应用。
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