CN108690018A - 一种咪唑并[1,2-a]吡啶衍生物的制备方法 - Google Patents
一种咪唑并[1,2-a]吡啶衍生物的制备方法 Download PDFInfo
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- UMJSCPRVCHMLSP-UHFFFAOYSA-N pyridine Natural products COC1=CC=CN=C1 UMJSCPRVCHMLSP-UHFFFAOYSA-N 0.000 title abstract 4
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Classifications
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- C—CHEMISTRY; METALLURGY
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- C07D—HETEROCYCLIC COMPOUNDS
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- C07D471/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00 in which the condensed system contains two hetero rings
- C07D471/04—Ortho-condensed systems
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D513/00—Heterocyclic compounds containing in the condensed system at least one hetero ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for in groups C07D463/00, C07D477/00 or C07D499/00 - C07D507/00
- C07D513/02—Heterocyclic compounds containing in the condensed system at least one hetero ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for in groups C07D463/00, C07D477/00 or C07D499/00 - C07D507/00 in which the condensed system contains two hetero rings
- C07D513/04—Ortho-condensed systems
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Pyridine Compounds (AREA)
- Nitrogen Condensed Heterocyclic Rings (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
Abstract
本发明公开了一种咪唑并[1,2‑a]吡啶衍生物的制备方法,属于有机合成领域。该方法以2‑苯氧基苯乙酮类化合物为起始原料,单质碘为催化剂,与2‑氨基吡啶类化合物反应,后经柱色谱分离得到咪唑并[1,2‑a]吡啶衍生物。本发明与现有技术相比反应收率高,后处理简单,更适合工业化生产。制得的咪唑并[1,2‑a]吡啶衍生物可作为药物前体,用于抗真菌、抗炎、抗肿瘤、抗病毒、抗细菌、抗原生动物、解热、镇痛、抗细胞凋亡等药物的合成,同时还可应用于有机光电材料及医药、生物探针、荧光染料等领域。
Description
技术领域
本发明属于有机合成领域,涉及一类咪唑并[1,2-a]吡啶衍生物的合成方法,尤其涉及取代的3-苯氧基咪唑并[1,2-a]吡啶衍生物的制备方法。
背景技术
咪唑并吡啶是一类具有重要生物活性的含氮杂环化合物。咪唑并[1,2-a]吡啶单元结构广泛存在于天然产物和药物分子中,其衍生物表现出广泛的生物活性,例如抗真菌、抗炎、抗肿瘤、抗病毒、抗细菌、抗原生动物、解热、镇痛、抗细胞凋亡等。其中C-3位取代的咪唑并[1,2-a]吡啶类化合物可作为代谢型谷氨酸受体2调节剂(I)、抗癌症药物(II)、治疗骨质疏松药物(III)、神经递质抑制剂(IV)等。此外,咪唑并[1,2-a]吡啶在光电领域也有很重要的应用,作为良好的电荷运载体,它也被广泛应用于生物探针、荧光染料和光电材料领域。因此,高效、绿色地构建这类分子骨架具有重要的实际意义。
目前,合成咪唑并[1,2-a]吡啶类化合物的策略主要有砌块缩合、串联反应和多组分联合构建。虽然合成咪唑并[1,2-a]吡啶类化合物的方法众多,但是这些方法都存在一些不足,例如需要昂贵的试剂、毒性较大的原料或者底物需多步制备等,特别是对于3-苯氧基咪唑并[1,2-a]吡啶衍生物,仍缺乏有效便捷的合成策略。鉴于该类化合物在各化学领域中都占据着重要的地位,因此,探索更加高效、实用的咪唑并[1,2-a]吡啶化合物的合成方法十分必要。
发明内容
本发明目的在于提供一种收率高、后处理简单、适合工业化生产3-苯氧基咪唑并[1,2-a]吡啶衍生物的新制备方法。
为实现本发明目的,本发明反应路线如下:
或者,
Ar1, Ar2同上。
优选:
本发明反应步骤如下:
在惰性气体保护下,向干燥反应器中加入2-苯氧基苯乙酮类化合物、2-氨基吡啶类化合物、溶剂以及单质碘,然后在100ºC-110 ºC条件下反应,反应结束后,反应液分别用饱和硫代硫酸钠、水、饱和食盐水洗涤,有机层经柱色谱分离得到相应的咪唑并[1,2-a]吡啶类化合物;
所述的2-苯氧基苯乙酮类化合物与2-氨基吡啶类化合物的摩尔比为1 : 1-3,所述的2-苯氧基苯乙酮类化合物与单质碘的摩尔比为1:1-2。
所述的溶剂选卤代烃或烷烃,优选二氯甲烷,二氯乙烷,氯仿,四氯化碳;或正己烷,环己烷。本发明有益效果在于:以2-苯氧基苯乙酮类化合物和2-氨基吡啶类化合物为起始原料,利用单质碘作为催化剂发生反应生成3-苯氧基咪唑并[1,2-a]吡啶类化合物,改变了传统工艺中金属催化剂的使用。该反应操作简单,条件温和,不产生其他杂质,生成3-苯氧基咪唑并[1,2-a]吡啶类化合物的收率均在97%以上,特别适合多种带有取代基的3-苯氧基咪唑并[1,2-a]吡啶类化合物的制备,更适合工业化生产。制得的3-苯氧基咪唑并[1,2-a]吡啶类化合物可有效应用于有机药物合成、有机光电材料及医药、生物探针、荧光染料等领域。
具体实施方式
为更好地对本发明进行详细说明,举实例如下:
实施例1 2-苯基-3-苯氧基咪唑并[1,2-a]吡啶的合成
惰性气体保护下,向干燥反应器中加入2-苯氧基苯乙酮(0.5 mmol, 106 mg)、2-氨基吡啶(1.0mmol, 100 mg)、15 ml 1,2-二氯乙烷以及单质碘(0.5mmol, 137 mg),然后在100º油浴中反应30分钟。反应液分别用饱和硫代硫酸钠、水、饱和食盐水洗涤,有机层经无水硫酸钠干燥,柱色谱分离得到相应的咪唑并[1,2-a]吡啶143mg,收率99.7 %;1H NMR (400MHz, CDCl3) δ: 8.00-7.92 (m, 2H), 7.62 (dt, J = 6.8, 1.3 Hz, 1H), 7.57-7.50(m, 1H), 7.33- 7.24 (m, 2H), 7.19 (dtd, J = 9.7, 7.3, 2.9 Hz, 3H), 7.07 (ddd,J = 9.1, 6.7, 1.3 Hz, 1H), 6.99 (t, J = 7.3 Hz, 1H), 6.86 (dd, J = 7.7, 1.5Hz, 2H), 6.63 (td, J = 6.9, 1.1 Hz, 1H)。
实施例2 3-苯氧基-2-苯基苯并[d]咪唑并[2,1-b]噻唑的合成
惰性气体保护下,向干燥反应器中加入2-苯氧基苯乙酮(0.5 mmol, 106 mg)、2-氨基苯并噻唑(1.5 mmol, 226 mg)、15 ml 氯仿以及单质碘(0.5 mmol, 137 mg),然后在100 ºC油浴中反应70分钟。反应液分别用饱和硫代硫酸钠、水、饱和食盐水洗涤,有机层经无水硫酸钠干燥,柱色谱分离得到 3-苯氧基-2-苯基苯并[d]咪唑并[2,1-b]噻唑167 mg,收率97.5 %;1H NMR (400 MHz, CDCl3) δ: 7.95-7.87 (m, 2H), 7.73-7.65 (m, 1H), 7.52-7.45 (m, 1H), 7.41-7.28 (m, 6H), 7.25- 7.21 (m, 1H), 7.17 – 7.05 (m, 3H)。
实施例3 2-(4-溴苯基)-3-苯氧基咪唑并[1,2-a]吡啶的合成
惰性气体保护下,向干燥反应器中加入1-(4-溴苯基)-2-苯氧基-1-酮(0.5 mmol, 146mg)、2-氨基吡啶(1.5 mmol, 149 mg)、15 ml 1,2-二氯乙烷以及单质碘(1 mmol, 274mg),然后在100 ºC油浴中反应40分钟。反应液分别用饱和硫代硫酸钠、水、饱和食盐水洗涤,有机层经无水硫酸钠干燥,再减压浓缩,柱色谱分离得到2-(4-溴苯基)-3-苯氧基咪唑并[1,2-a]吡啶182 mg,收率99.2 %;1H NMR (400 MHz, CDCl3) δ: 8.15 (d, J = 9.1 Hz,1H), 8.06 -7.97 (m, 2H), 7.92 (dd, J = 6.6, 1.2 Hz, 1H), 7.61- 7.50 (m, 3H),7.41-7.32 (m, 2H), 7.23-7.14 (m, 1H), 7.08 (t, J = 6.8 Hz, 1H), 7.00-6.92 (m,2H)。
实施例4 2-苯基-3-(间甲苯氧基)-咪唑并[1,2-a]吡啶的合成
惰性气体保护下,向干燥反应器中加入1-苯基-2-(间甲氧基苯基)乙烷-1-酮(0.5mmol, 113 mg)、2-氨基吡啶(1.5 mmol, 149 mg)、15 ml 正己烷以及单质碘(0.5 mmol,137 mg),然后在100 ºC油浴中反应50分钟。反应液分别用饱和硫代硫酸钠、水、饱和食盐水洗涤,有机层经无水硫酸钠干燥,柱色谱分离得到 2-苯基-3-(间甲苯氧基)-咪唑并[1,2-a]吡啶150 mg收率99.7 %;1H NMR (400 MHz, CDCl3) δ: 8.04-7.97 (m, 2H), 7.78-7.67(m, 2H), 7.33 (dd, J = 8.4, 7.0 Hz, 2H), 7.27 -7.16 (m, 2H), 7.11 (t, J = 7.9Hz, 1H), 6.85 (dd, J = 7.6, 1.4 Hz, 1H), 6.77 (td, J = 6.8, 1.1 Hz, 1H),6.73-6.63 (m, 2H)。
Claims (3)
1.一种咪唑并[1,2-a]吡啶衍生物的制备方法,其特征在于,通过如下步骤实现:在惰性气体保护下,向干燥反应器中加入式1 2-苯氧基苯乙酮类化合物、卤代烃或烷烃溶剂及式22-氨基吡啶类化合物或式4化合物以及单质碘,然后在100 ºC-110 ºC条件下反应,反应结束后停止反应;反应液分别经饱和硫代硫酸钠、水、饱和食盐水洗涤,有机相经柱色谱分离得到式3咪唑并[1,2-a]吡啶类化合物或式5化合物;
。
2.如权利要求1所述的咪唑并[1,2-a]吡啶衍生物的制备方法,其特征在于,选如下取代基化合物:
。
3.如权利要求1或2所述的咪唑并[1,2-a]吡啶衍生物的制备方法,其特征在于,所述的2-苯氧基苯乙酮类化合物与2-氨基吡啶类化合物的摩尔比为1:1-3,所述的2-苯氧基苯乙酮类化合物与单质碘的摩尔比为1:1-2。
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