CN116239594B - 6- (imidazo [1,2-a ] pyridin-6-yl) quinazoline derivatives and uses thereof - Google Patents

6- (imidazo [1,2-a ] pyridin-6-yl) quinazoline derivatives and uses thereof Download PDF

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CN116239594B
CN116239594B CN202310199761.3A CN202310199761A CN116239594B CN 116239594 B CN116239594 B CN 116239594B CN 202310199761 A CN202310199761 A CN 202310199761A CN 116239594 B CN116239594 B CN 116239594B
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quinazolin
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范艳华
李梅
罗芳
钟婷
熊亮
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Key Laboratory of Natural Product Chemistry of Guizhou Academy of Sciences
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Abstract

The invention relates to a structural general formula (I) 6- (imidazo [1, 2-a)]Pyridin-6-yl) quinazolines wherein R 1 、R 2 、R 3 Pharmaceutical compositions, methods of making, and methods of using the compounds defined below as active ingredients. The invention provides an antitumor compound which has the activity of inhibiting human non-small cell lung cancer, human erythroleukemia, human neuroblastoma and human breast cancer, and can inhibit the growth of tumor cells, block the cycle and induce the apoptosis of cancer cells.

Description

6- (imidazo [1,2-a ] pyridin-6-yl) quinazoline derivatives and uses thereof
Technical Field
The invention belongs to the field of pharmacy, and particularly relates to a 6- (imidazo [1,2-a ] pyridine-6-yl) quinazoline derivative, a preparation method and application of the 6- (imidazo [1,2-a ] pyridine-6-yl) quinazoline derivative in preparation of antitumor drugs.
Background
Phosphatidylinositol 3-kinase (PI 3K) is a lipid kinase that plays a key regulatory role in a variety of physiological processes such as cell growth, proliferation, survival and metabolism. PI3 ks are generally classified into three classes (class I, class II and class III). Pi3kα belongs to class I and mainly comprises one regulatory subunit (p 85) and one catalytic subunit (p 110). Mutation of PIK3CA, the coding gene for pi3kα, is one of the most common mutations in tumors, leading to under-expression or disappearance of PTEN and excessive activation of PI3K downstream signaling pathways. Inhibitors against PI3 ks have attracted considerable attention due to the key role of PI3K signaling in tumorigenesis, development and drug resistance. Currently, tens of subtype selective and pan PI3K inhibitors are in different stages of clinical research for the treatment of human malignancies. However, since the expression of pi3kα, pi3kβ, pi3kδ and pi3kγ in normal tissues and immune cells is ubiquitous, there remains a need to develop selective PI3K inhibitors to reduce toxicity. BRD4 is an important member of the nuclear transcription factor family of bromodomain proteins, and BRD4 participates in cell cycle regulation by binding to acetylated proteins, regulates DNA replication, gene transcription, plays an important role in differentiation and development, and is closely related to the occurrence of many tumors. Given its important role in tumors, BRD4 makes it one of the targets for cancer treatment. Single-target inhibitors are often associated with resistance, low drug screening efficiency and poor prognosis, and many neoplastic diseases are incurable with a single target. However, drugs that interfere with dual targets simultaneously can act on multiple pathological links and pathogenesis of the same disease, producing synergistic effects, and can improve clinical efficacy. Therefore, the development of the targeting drugs has become a new research hotspot of anti-tumor drugs.
The quinazoline compounds are nitrogen-containing heterocyclic compounds with good biological activity, and have various pharmacological and biological activities, such as anti-inflammatory, antibacterial, anti-tuberculosis, anti-diabetes, anti-HIV and anti-cancer effects. Of the quinazoline compounds, 4-arylamine quinazoline exhibits excellent activity in the anticancer field. The imidazopyridine compounds are very important nitrogen-containing condensed heterocyclic compounds, and many imidazopyridine compounds have antibacterial, antiviral, antimicrobial, antitumor and other activities, so that the imidazopyridine has attracted wide attention due to the effect of effectively inhibiting the growth of cancer cells. At present, no related research and report on the synthesis of 6- (imidazo [1,2-a ] pyridin-6-yl) quinazoline derivatives and related antitumor application thereof exist.
Disclosure of Invention
The invention aims to provide a 6- (imidazo [1,2-a ] pyridine-6-yl) quinazoline derivative and application of the derivative in anti-tumor effect.
In order to achieve the above purpose, the invention adopts the following technical scheme: 6- (imidazo [1,2-a ] pyridin-6-yl) quinazoline compounds of general formula (I)
Wherein R is 1 Selected from H, methyl or ethyl;
R 2 selected from ethylcyclopropane, 2-ethylpyridine, 1-ethyl-2-fluorobenzene, 1-fluoro-3-methylbenzene, 1, 2-difluoro-3-methylbenzene, 3-methyl-1H-pyrazole, 4-ethyltetrahydro-2H-pyran, p-xylene or toluene;
R 3 selected from ethyl acetate, methyl acetate, toluene, 1-fluoro-4-methylbenzene or methylcyclopropane.
Further, the compounds include analogs, pharmaceutically acceptable salts, stereoisomers, and/or solvates.
Further, the compound is selected from the following:
(A1) 6- (4- ((cyclopropylmethyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylic acid ethyl ester
(A2) 6- (4- ((pyridin-2-ylmethyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylic acid ethyl ester
(A3) 6- (4- ((2-Fluorobenzyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylic acid ethyl ester
(A4) 6- (4- ((3-fluorophenyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylic acid ethyl ester
(A5) 6- (4- ((2, 3-difluorophenyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylic acid ethyl ester
(A6) 6- (4- (Ethyl (phenyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylic acid ethyl ester
(A7) 6- (4- ((pyridin-2-ylmethyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylic acid methyl ester
(A8) 6- (4- ((2-Fluorobenzyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylic acid methyl ester
(A9) 6- (4- ((3-fluorophenyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylic acid methyl ester
(A10) Methyl 6- (4- (methyl (p-toluene) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylate (A11) methyl 6- (4- ((cyclopropylmethyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylate (A12) N- (2-fluorobenzyl) -6- (2-phenylimidazo [1,2-a ] pyridin-6-yl) quinazolin-4-amine
(A13) N- (2-fluorobenzyl) -6- (2- (4-fluorophenyl) imidazo [1,2-a ] pyridin-6-yl) quinazolin-4-amine
(A14) N- (2, 3-difluorophenyl) -6- (2-phenylimidazo [1,2-a ] pyridin-6-yl) quinazolin-4-amine
(A15) N- (2, 3-difluorophenyl) -6- (2- (4-fluorophenyl) imidazo [1,2-a ] pyridin-6-yl) quinazolin-4-amine
(A16) N- (cyclopropylmethyl) -6- (2- (4-fluorophenyl) imidazo [1,2-a ] pyridin-6-yl) quinazolin-4-amine
(A17) 6- (2-phenylimidazo [1,2-a ] pyridin-6-yl) -N- (1H-pyrazol-3-yl) quinazolin-4-amine
(A18) 6- (2-Cyclopropylimidazo [1,2-a ] pyridin-6-yl) -N- (cyclopropylmethyl) quinazolin-4-amine (A19) 6- (2-Cyclopropylimidazo [1,2-a ] pyridin-6-yl) -N-ethyl-N-phenylquinazolin-4-amine
(A20) N-ethyl-N-phenyl-6- (2-phenylimidazo [1,2-a ] pyridin-6-yl) quinazolin-4-amine
(A21) 6- (2-phenylimidazo [1,2-a ] pyridin-6-yl) -N- (pyridin-2-ylmethyl) quinazolin-4-amine
(A22) 6- (2-phenylimidazo [1,2-a ] pyridin-6-yl) -N- ((tetrahydropyran-4-yl) methyl) quinazolin-4-amine
(A23) N- (cyclopropylmethyl) -6- (2-phenylimidazo [1,2-a ] pyridin-6-yl) quinazolin-4-amine.
A method for synthesizing the end products A1-A11 in the general formula (I) comprises the following steps:
(1) Preparation of 4-chloro-6-iodoquinazoline intermediate: preparing a 4-chloro-6-iodoquinazoline intermediate by chlorating raw materials of iodoquinazoline-4 (3H) -ketone, N-diisopropylethylamine and phosphorus oxychloride under the condition that a solvent is anhydrous toluene;
(2) Preparation of differently substituted 6-iodoquinazolin-4-amine intermediates: preparing intermediates of different substituted 6-iodoquinazolin-4-amine by taking 4-chloro-6-iodoquinazolin and different primary amine or secondary amine as raw materials and isopropanol as a solvent;
(3) Takes 6-iodoquinazolin-4-amine, 2-aminopyridine-5-boric acid, pinacol ester and potassium carbonate which are substituted differently as raw materials, V (1, 4-Dioxahexacyclic ring) :V (H2O) =4:1 as solvent, 1-bis (diphenylphosphine) dicyclopentadienyl iron palladium dichloride as catalyst to prepare differently substituted 6- (6-aminopyridin-3-yl) quinazolin-4-amine intermediates;
(4) Preparing end products A1-A11 by adding absolute ethyl alcohol into differently substituted 6- (6-aminopyridin-3-yl) quinazoline-4-amine intermediates, methyl bromopyruvate/ethyl bromopyruvate and sodium bicarbonate;
a method for synthesizing the end product A12-A23 in the general formula (I) comprises the following steps:
(1) Preparation of 4-chloro-6-iodoquinazoline intermediate: preparing a 4-chloro-6-iodoquinazoline intermediate by chlorating raw materials of iodoquinazoline-4 (3H) -ketone, N-diisopropylethylamine and phosphorus oxychloride under the condition that a solvent is anhydrous toluene;
(2) Preparation of differently substituted 6-iodoquinazolin-4-amine intermediates: preparing intermediates of different substituted 6-iodoquinazolin-4-amine by taking 4-chloro-6-iodoquinazolin and different primary amine or secondary amine as raw materials and isopropanol as a solvent;
(3) Different substituted 2-methyl-6- (4, 5-tetramethyl-1, 3, 2-dioxaborane-2-yl) imidazo [1,2-a ] pyridine intermediates were prepared from different substituted bromoacetones, 2-aminopyridine-5-boronic acid, pinacol esters, and sodium bicarbonate in anhydrous ethanol.
(4) 2-methyl-6- (4, 5-tetramethyl-1, 3, 2-dioxaborane-2-yl) imidazo [1,2-a ] with different substitutions]Pyridine, different substituted 6-iodoquinazolin-4-amine and potassium carbonate are used as raw materials, V (1, 4-Dioxahexacyclic ring) :V (H2O) =4:1 as solvent, 1-bis (diphenylphosphine) dicyclopentadienyl iron palladium dichloride as catalyst to prepare the final product a23-a34;
the beneficial technical effects of the invention are as follows: the invention provides an antitumor compound which has the activity of inhibiting human non-small cell lung cancer, human erythroleukemia, human neuroblastoma and human breast cancer, and can inhibit the growth of tumor cells, block the cycle and induce the apoptosis of cancer cells.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a graph showing the effect of compound A22 of the present invention on PI3K signaling pathway in HCC827 (human non-small cell lung cancer cell);
FIG. 2 is a graph showing the G2/M results of the compound A22 of the present invention for inducing HCC827 cells;
fig. 3 is the induction of apoptosis of HCC827 cells by compound a22 of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The synthesis of ethyl 6- (4- ((cyclopropylmethyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylate (compound No. A1) comprises the steps of:
(1) Preparation of 4-chloro-6-iodoquinazoline
A mixture of 6-iodoquinazolin-4 (3H) -one (2.45 g,9 mmol), N-diisopropylethylamine (2.33 g,18 mmol), phosphorus oxychloride (2.76 g,18 mmol) and anhydrous toluene (50 mL) was weighed and reacted under argon at 80℃for 4 hours. After completion of the reaction monitored by TLC, the reaction mixture was cooled and the solvent was removed under reduced pressure. The mixture was extracted 2-3 times with ethyl acetate and saturated sodium bicarbonate solution. Organic compoundAnhydrous Na for phase 2 SO 4 Drying, filtering, vacuum spin drying, and separating and purifying [ V ] by chromatography column chromatography (Ethyl acetate) :V (Petroleum ether) =100:1]A white solid was obtained, 2.29g, yield 58.6%.
(2) N- (cyclopropylmethyl) -6-iodoquinazolin-4-amine
A mixture of 4-chloro-6-iodoquinazoline (0.58 g,2 mmol) and cyclopropylmethylamine (0.17 g,2.4 mmol) was added to isopropanol (10 ml) and refluxed at 60℃for 2 hours under argon. After the reaction was completed, the solvent of the reaction mixture was removed under reduced pressure, and ethyl acetate and saturated Na were used 2 CO 3 The solution is extracted for 2 to 3 times. Anhydrous Na for organic phase 2 SO 4 The mixture was dried over, filtered and spun-dried in vacuo to give N- (cyclopropylmethyl) -6-iodoquinazolin-4-amine as an off-white solid (0.593 g, 1.284 mmol) in 91.2% yield.
(3) Preparation of 6- (6-aminopyridin-3-yl) -N- (cyclopropylmethyl) quinazolin-4-amine
N- (cyclopropylmethyl) -6-iodoquinazolin-4-amine (0.5 g,1.5 mmol), 5- (4, 5-tetramethyl-1, 3, 2-dioxaborolan-2-yl) pyridin-2-amine (0.34 g,1.5 mmol) and K 2 CO 3 (0.64 g,4.6 mmol) to 15ml of 1, 4-dioxane/water [ V (1, 4-Dioxahexacyclic ring) :V (Water) =4:1]In the process, the mixture is heated to 100 ℃ under the protection of argon, and then Pd (dppf) Cl is added 2 . The mixture was stirred under these conditions for a further 4-6 hours. After the reaction is completed, the 1, 4-dioxane and water are removed under reduced pressure, and the [ V ] is separated and purified by chromatography column chromatography (dichloromethane) :V (methanol) =33:1]6- (6-Aminopyridin-3-yl) -N- (4-methoxybenzyl) quinazolin-4-amine was obtained as a white solid (0.315 g,1.08 mmol) in 72.1% yield.
(4) Preparation procedure of ethyl 6- (4- ((cyclopropylmethyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylate
6- (6-Aminopyridin-3-yl) -N- (4-methoxybenzyl) quinazolin-4-amine (0.17 g,0.58 mmol), ethyl bromopyruvate (0.34 g,1.75 mmol) and NaHCO 3 (0.15 g,1.75 mmol) was added to EtOH (5 ml) and the mixture was heated to 80℃and condensed under argon reflux for 4 hours. ReactionAfter completion, the solvent was removed under reduced pressure, and [ V ] was purified by column chromatography (dichloromethane) :V (methanol) =50:1]Obtaining 6- (4- ((4-methoxybenzyl) amino) quinazolin-6-yl) imidazo [1,2-a]Pyridine-2-carboxylic acid ethyl ester as white solid (0.112 g,0.289 mmol) yield 49.8%, melting point 128.5-130.8 ℃, HRMS (ESI): [ M+H ]] + 388.1760;[M+Na] + 410.1580。
Example 2
The synthesis of ethyl 6- (4- ((pyridin-2-ylmethyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylate (compound No. A2) comprises the following steps:
(1) Preparation of 4-chloro-6-iodoquinazoline
Step (1) as in example 1.
(2) Preparation of 6-iodo-N- (pyridin-2-ylmethyl) quinazolin-4-amine
As in step (2) of example 1, a pale yellow solid was obtained in 92.1% yield.
(3) Preparation of 6- (6-aminopyridin-3-yl) -N- (pyridin-2-ylmethyl) quinazolin-4-amine
As in step (3) of example 1, yellow solid, 70.6% yield.
(4) Preparation of ethyl 6- (4- ((pyridin-2-ylmethyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylate
As in example 1, step (4) was a yellow solid in 57.3% yield, melting point 129.6-131.5℃HRMS (ESI): [ M+H ]] + 425.1712;[M+Na] + 447.1532。
Example 3
The synthesis of ethyl 6- (4- ((2-fluorobenzyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylate (compound number A3) comprises the steps of:
(1) Preparation of 4-chloro-6-iodoquinazoline
Step (1) as in example 1.
(2) Preparation of N- (2-fluorobenzyl) -6-iodoquinazolin-4-amine
As in step (2) of example 1, an off-white solid was obtained in 61.9% yield.
(3) Preparation of 6- (6-aminopyridin-3-yl) -N- (2-fluorobenzyl) quinazolin-4-amine
As in step (3) of example 1, an off-white solid, 86.3% yield.
(4) Preparation of ethyl 6- (4- ((2-fluorobenzyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylate
As in step (4) of example 1, the product was an off-white solid in 59.2% yield, melting point 142.3-144.6℃and HRMS (ESI): [ M+H ]] + 442.1664;[M+Na] + 464.1486。
Example 4
The synthesis of ethyl 6- (4- ((3-fluorophenyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylate (compound No. A4) comprises the steps of:
(1) Preparation of 4-chloro-6-iodoquinazoline
Step (1) as in example 1.
(2) Preparation of N- (3-fluorophenyl) -6-iodoquinazolin-4-amine
As in step (2) of example 1, light yellow solid was obtained in 85.3% yield.
(3) Preparation of 6- (6-aminopyridin-3-yl) -N- (3-fluorophenyl) quinazolin-4-amine
As in step (3) of example 1, light yellow solid, 77.6% yield.
(4) Preparation of ethyl 6- (4- ((3-fluorophenyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylate
As in example 1, step (4) was a yellow solid in 46.7% yield, melting point 148.3-150.1 ℃, HRMS (ESI): [ M+Na ]] + 450.1328。
Example 5
The synthesis of ethyl 6- (4- ((2, 3-difluorophenyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylate (compound No. A5) comprises the steps of:
(1) Preparation of 4-chloro-6-iodoquinazoline
Step (1) as in example 1.
(2) Preparation of N- (2, 3-difluorophenyl) -6-iodoquinazolin-4-amine
As in step (2) of example 1, an off-white solid was obtained in 93.6% yield.
(3) Preparation of 6- (6-aminopyridin-3-yl) -N- (2, 3-difluorophenyl) quinazolin-4-amine
As in step (3) of example 1, a white solid, 88.7% yield.
(4) Preparation of ethyl 6- (4- ((2, 3-difluorophenyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylate
As in step (4) of example 1, the product was a white solid with a yield of 55.3%, a melting point of 131.2-133.6℃and an HRMS (ESI): [ M+H ]] + found 446.1411;[M+Na] + 468.1231。
Example 6
The synthesis of ethyl 6- (4- (ethyl (phenyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylate (compound No. A6) comprises the steps of:
(1) Preparation of 4-chloro-6-iodoquinazoline
Step (1) as in example 1.
(2) Preparation of N-ethyl-6-iodo-N-phenylquinazolin-4-amine
As in step (2) of example 1, a pale yellow solid was obtained in 95.7% yield.
(3) Preparation of 6- (6-aminopyridin-3-yl) -N-ethyl-N-phenylquinazolin-4-amine
As in step (3) of example 1, a yellow solid was obtained in 75.7% yield.
(4) Preparation of ethyl 6- (4- (ethyl (phenyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylate
As in example 1, step (4), was a pink floccule, yield 63.1%, melting point 176.7-177.8deg.C, HRMS (ESI): [ M+H ]] + found 438.1916;[M+Na] + 460.1735。
Example 7
The synthesis of methyl 6- (4- ((pyridin-2-ylmethyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylate (compound No. A7) comprises the steps of:
(1) Preparation of 4-chloro-6-iodoquinazoline
Step (1) as in example 1.
(2) Preparation of 6-iodo-N- (pyridin-2-ylmethyl) quinazolin-4-amine
As in step (2) of example 1, a pale yellow solid was obtained in 92.1% yield.
(3) Preparation of 6- (6-aminopyridin-3-yl) -N- (pyridin-2-ylmethyl) quinazolin-4-amine
As in step (3) of example 1, yellow solid, 70.6% yield.
(4) Preparation of methyl 6- (4- ((pyridin-2-ylmethyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylate
6- (6-Aminopyridin-3-yl) -N- (pyridin-2-ylmethyl) quinazolin-4-amine (0.18 g,0.55 mmol), methyl bromopyruvate (0.298 g,1.6 mmol) and NaHCO were weighed out 3 (0.138 g,1.6 mmol) was added to EtOH (5 ml) and the mixture was heated to 80℃and condensed under argon reflux for 4 hours. After the completion of the reaction, the solvent was removed under reduced pressure, and [ V ] was purified by column chromatography (dichloromethane) :V (methanol) =50:1]Obtaining 6- (4- ((pyridin-2-ylmethyl) amino) quinazolin-6-yl) imidazo [1,2-a]Pyridine-2-carboxylic acid methyl ester as yellow solid (0.1215 g, 0.292 mmol), yield 53.8%, melting point 143.7-145.6deg.C, HRMS (ESI): [ M+H ]] + 411.1556;[M+Na] + 433.1372。
Example 8
The synthesis of methyl 6- (4- ((2-fluorobenzyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylate (compound number A8) comprises the steps of:
(1) Preparation of 4-chloro-6-iodoquinazoline
Step (1) as in example 1.
(2) Preparation of N- (2-fluorobenzyl) -6-iodoquinazolin-4-amine
As in step (2) of example 1, an off-white solid was obtained in 61.9% yield.
(3) Preparation of 6- (6-aminopyridin-3-yl) -N- (2-fluorobenzyl) quinazolin-4-amine
As in step (3) of example 1, an off-white solid, 86.3% yield.
(4) Preparation of methyl 6- (4- ((2-fluorobenzyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylate
As in example 7, step (4) was an off-white solid, 52.1% yield, melting point 174.0-176.2 ℃, HRMS (ESI): [ M+H ]] + 428.1509;[M+Na] + 450.1330。
Example 9
The synthesis of methyl 6- (4- ((3-fluorophenyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylate (compound No. A9) comprises the steps of:
(1) Preparation of 4-chloro-6-iodoquinazoline
Step (1) as in example 1.
(2) Preparation of N- (3-fluorophenyl) -6-iodoquinazolin-4-amine
As in step (2) of example 1, light yellow solid was obtained in 85.3% yield.
(3) Preparation of 6- (6-aminopyridin-3-yl) -N- (3-fluorophenyl) quinazolin-4-amine
As in step (3) of example 1, light yellow solid, 77.6% yield.
(4) Preparation of methyl 6- (4- ((3-fluorophenyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylate
As in example 7, step (4) was an off-white solid, 52.1% yield, melting point 174.0-176.2 ℃, HRMS (ESI): [ M+H ]] + 414.1347;[M+Na] + 436.1172。
Example 10
The synthesis of methyl 6- (4- (methyl (p-toluene) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylate (compound No. a 10) comprises the steps of:
(1) Preparation of 4-chloro-6-iodoquinazoline
Step (1) as in example 1.
(2) Preparation of 6-iodo-N-methyl-N- (p-tolyl) quinazolin-4-amine
As in step (2) of example 1, a pale yellow solid was obtained in 94.0% yield.
(3) Preparation of 6- (6-aminopyridin-3-yl) -N-methyl-N- (p-tolyl) quinazolin-4-amine
As in step (3) of example 1, a pale yellow solid was obtained in 79.8% yield.
(4) Preparation of methyl 6- (4- (methyl (p-toluene) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylate
As in example 7, step (4), 39.5% yield of pink floc, melting point 172.8-174.3 ℃, HRMS (ESI): M+H] + 424.1757;[M+Na] + 446.1580。
Example 11
The synthesis of methyl 6- (4- ((cyclopropylmethyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylate (compound No. a 11) comprises the steps of:
(1) Preparation of 4-chloro-6-iodoquinazoline
Step (1) as in example 1.
(2) Preparation of N- (cyclopropylmethyl) -6-iodoquinazolin-4-amine
As in example 1, step (2) was an off-white solid in 91.2% yield.
(3) Preparation of 6- (6-aminopyridin-3-yl) -N- (cyclopropylmethyl) quinazolin-4-amine
As in example 1, step (3) was an off-white solid in 71.2% yield.
(4) Preparation of methyl 6- (4- ((cyclopropylmethyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylate
As in example 7, step (4), was an orange floc, yield 30.1%, melting point 164.6-166.9 ℃, HRMS (ESI): [ M+H ]] + 374.1612;[M+Na] + 396.1431。
Example 12
The synthesis of N- (2-fluorobenzyl) -6- (2-phenylimidazo [1,2-a ] pyridin-6-yl) quinazolin-4-amine (compound No. a 12) comprises the steps of:
(1) Preparation of 4-chloro-6-iodoquinazoline
Step (1) as in example 1.
(2) Preparation of N- (2-fluorobenzyl) -6-iodoquinazolin-4-amine
As in step (2) of example 1, an off-white solid was obtained in 61.9% yield.
(3) Preparation of 2-phenyl-6- (4, 5-tetramethyl-1, 3, 2-dioxaboran-2-yl) imidazo [1,2-a ] pyridine
Weighing 5- (4, 5-tetramethyl-1, 3, 2-dioxaborolan-2-yl) pyridin-2-amine (1.2 g,5.4 mmol), 2-bromo-1-acetophenone (1.3 g,6.5 mmol) and NaHCO 3 (1.4 g,16 mmol) was added to absolute ethanol (10 ml) and the mixture was heated to 80℃and condensed under argon reflux for 4 hours. After the reaction was completed, the solvent was removed under reduced pressure, and ethyl acetate and saturated Na were used 2 CO 3 The mixture was extracted 2-3 times with the solution. Organic compoundAnhydrous Na for phase 2 SO 4 Drying, filtering and spin-drying under vacuum to obtain 2-phenyl-6- (4, 5-tetramethyl-1, 3, 2-dioxaborolan-2-yl) imidazole [1,2-a ]]Pyridine was a pale yellow oily substance in 86.8% yield.
(4) Preparation of N- (2-fluorobenzyl) -6- (2-phenylimidazo [1,2-a ] pyridin-6-yl) quinazolin-4-amine
N- (2-Fluorobenzyl) -6-iodoquinazolin-4-amine (0.19 g,0.5 mmol) was weighed out, 2-phenyl-6- (4, 5-tetramethyl-1, 3, 2-dioxaborane-2-yl) imidazole [1,2-a ]]Pyridine (0.16 g,0.5 mmol) and K 2 CO 3 (0.21 g,1.5 mmol) was added to 10ml 1, 4-dioxane/water [ V (1, 4-Dioxahexacyclic ring) :V (Water) =4:1]In the process, the mixture is heated to 100 ℃ under the protection of argon, pd (dppf) Cl is added 2 . The mixture was continued to react for 4-5 hours. After the reaction is completed, the solvent is removed under reduced pressure, and the [ V ] is separated and purified by chromatography column chromatography (dichloromethane) :V (methanol) =80:1]To obtain N- (2-fluorobenzyl) -6- (2-phenylimidazole [1, 2-a)]Pyridin-6-yl) quinazolin-4-amine as pink floc in 67.3% yield, melting point 130.8-132.2 ℃, HRMS (ESI): [ M+H ]] + 446.1768。
Example 13
The synthesis of N- (2-fluorobenzyl) -6- (2- (4-fluorophenyl) imidazo [1,2-a ] pyridin-6-yl) quinazolin-4-amine (compound No. a 13) comprises the steps of:
(1) Preparation of 4-chloro-6-iodoquinazoline
Step (1) as in example 1.
(2) Preparation of N- (2-fluorobenzyl) -6-iodoquinazolin-4-amine
As in step (2) of example 1, an off-white solid was obtained in 61.9% yield.
(3) Preparation of 2- (4-fluorophenyl) -6- (4, 5-tetramethyl-1, 3, 2-dioxaboran-2-yl) imidazo [1,2-a ] pyridine
As in example 12, step (3), yellow solid was obtained in 81.5% yield.
(4) Preparation of N- (2-fluorobenzyl) -6- (2- (4-fluorophenyl) imidazo [1,2-a ] pyridin-6-yl) quinazolin-4-amine
Step (4) of the method as in example 12, a pink floccule, yield70.7% and melting point 133.7-135.6deg.C, HRMS (ESI): [ M+H ]] + 464.1677。
Example 14
The synthesis of N- (2, 3-difluorophenyl) -6- (2-phenylimidazo [1,2-a ] pyridin-6-yl) quinazolin-4-amine (compound No. a 14) comprises the steps of:
(1) Preparation of 4-chloro-6-iodoquinazoline
Step (1) as in example 1.
(2) Preparation of N- (2, 3-difluorophenyl) -6-iodoquinazolin-4-amine
Step (2) as in example 1 was an off-white solid in 93.6% yield.
(3) Preparation procedure of 2-phenyl-6- (4, 5-tetramethyl-1, 3, 2-dioxaboran-2-yl) imidazo [1,2-a ] pyridine
As in example 12, in the step (3), a pale yellow oily substance was obtained in 86.8% yield.
(4) Preparation of N- (2, 3-difluorophenyl) -6- (2-phenylimidazo [1,2-a ] pyridin-6-yl) quinazolin-4-amine
As in example 12, step (4), in the form of pink floccule, yield 73.2%, melting point 142.0-144.3 ℃, HRMS (ESI): [ M+H ]] + 450.1520;[M+Na] + 472.1337。
Example 15
The synthesis of N- (2, 3-difluorophenyl) -6- (2- (4-fluorophenyl) imidazo [1,2-a ] pyridin-6-yl) quinazolin-4-amine (compound number a 15) comprises the steps of:
(1) Preparation of 4-chloro-6-iodoquinazoline
Step (1) as in example 1.
(2) Preparation of N- (2, 3-difluorophenyl) -6-iodoquinazolin-4-amine
Step (2) as in example 1 was an off-white solid in 93.6% yield.
(3) Preparation of 2- (4-fluorophenyl) -6- (4, 5-tetramethyl-1, 3, 2-dioxaboran-2-yl) imidazo [1,2-a ] pyridine
As in example 12, step (3), yellow solid was obtained in 81.5% yield.
(4) Preparation of N- (2, 3-difluorophenyl) -6- (2- (4-fluorophenyl) imidazo [1,2-a ] pyridin-6-yl) quinazolin-4-amine
As in example 12, step (4), in the form of pink floc, yield 72.5%, melting point 136.1-138.2 ℃, HRMS (ESI): [ M+H ]] + 468.1426;[M+Na] + 490.1239。
Example 16
The synthesis of N- (cyclopropylmethyl) -6- (2- (4-fluorophenyl) imidazo [1,2-a ] pyridin-6-yl) quinazolin-4-amine (compound No. a 16) comprises the steps of:
(1) Preparation of 4-chloro-6-iodoquinazoline
Step (1) as in example 1.
(2) Preparation of N- (cyclopropylmethyl) -6-iodoquinazolin-4-amine
As in example 1, step (2) was an off-white solid in 91.2% yield.
(3) Preparation of 2- (4-fluorophenyl) -6- (4, 5-tetramethyl-1, 3, 2-dioxaboran-2-yl) imidazo [1,2-a ] pyridine
As in example 12, step (3), yellow solid was obtained in 81.5% yield.
(4) Preparation of N- (cyclopropylmethyl) -6- (2- (4-fluorophenyl) imidazo [1,2-a ] pyridin-6-yl) quinazolin-4-amine
As in example 12, step (4), was a pink floccule, yield 56.1%, melting point 227.5-229.7 ℃, HRMS (ESI): [ M+H ]] + 410.1773。
Example 17
The synthesis of 6- (2-phenylimidazo [1,2-a ] pyridin-6-yl) -N- (1H-pyrazol-3-yl) quinazolin-4-amine (compound No. a 17) comprises the steps of:
(1) Preparation of 4-chloro-6-iodoquinazoline
Step (1) as in example 1.
(2) Preparation of 6-iodo-N- (1H-pyrazol-3-yl) quinazolin-4-amine
Step (2) as in example 1 was a white solid in 91.5% yield.
(3) Preparation procedure of 2-phenyl-6- (4, 5-tetramethyl-1, 3, 2-dioxaboran-2-yl) imidazo [1,2-a ] pyridine
As in example 12, in the step (3), a pale yellow oily substance was obtained in 86.8% yield.
(4) Preparation of 6- (2-phenylimidazo [1,2-a ] pyridin-6-yl) -N- (1H-pyrazol-3-yl) quinazolin-4-amine
As in example 12, step (4), as a pink solid, yield 54.6%, melting point 289.1-290.1 ℃, HRMS (ESI): [ M+H ]] + 404.1613;[M+Na] + 426.1426。
Example 18
The synthesis of 6- (2-cyclopropylimidazo [1,2-a ] pyridin-6-yl) -N- (cyclopropylmethyl) quinazolin-4-amine (compound No. a 18) comprises the steps of:
(1) Preparation of 4-chloro-6-iodoquinazoline
Step (1) as in example 1.
(2) Preparation of N- (cyclopropylmethyl) -6-iodoquinazolin-4-amine
As in example 1, step (2) was an off-white solid in 91.2% yield.
(3) Preparation procedure of 2-cyclopropyl-6- (4, 5-tetramethyl-1, 3, 2-dioxaboran-2-yl) imidazo [1,2-a ] pyridine
As in example 12, step (3) was a yellow solid in 81.5% yield.
(4) Preparation of 6- (2-cyclopropylimidazo [1,2-a ] pyridin-6-yl) -N- (cyclopropylmethyl) quinazolin-4-amine
As in example 12, step (4) was a yellow solid in 60.6% yield, melting point 118.6-120.5℃HRMS (ESI): [ M+H ]] + 356.1863;[M+Na] + 378.1682。
Example 19
The synthesis of 6- (2-cyclopropylimidazo [1,2-a ] pyridin-6-yl) -N-ethyl-N-phenylquinazolin-4-amine (compound No. a 19) comprises the steps of:
(1) Preparation of 4-chloro-6-iodoquinazoline
Step (1) as in example 1.
(2) Preparation of N-ethyl-6-iodo-N-phenylquinazolin-4-amine
As in step (2) of example 1, a pale yellow solid was obtained in 95.7% yield.
(3) Preparation procedure of 2-cyclopropyl-6- (4, 5-tetramethyl-1, 3, 2-dioxaboran-2-yl) imidazo [1,2-a ] pyridine
As in example 12, step (3) was a yellow solid in 81.5% yield.
(4) Preparation of 6- (2-cyclopropylimidazo [1,2-a ] pyridin-6-yl) -N-ethyl-N-phenylquinazolin-4-amine
As in example 12, step (4) was a yellow solid in 58.3% yield, melting point 166.8-168.7 ℃, HRMS (ESI): M+H] + 406.2019;[M+Na] + 428.1840。
Example 20
The synthesis of N-ethyl-N-phenyl-6- (2-phenylimidazo [1,2-a ] pyridin-6-yl) quinazolin-4-amine (compound No. a 20) comprises the following steps:
(1) Preparation of 4-chloro-6-iodoquinazoline
Step (1) as in example 1.
(2) Preparation of N-ethyl-6-iodo-N-phenylquinazolin-4-amine
As in step (2) of example 1, a pale yellow solid was obtained in 95.7% yield.
(3) Preparation procedure of 2-phenyl-6- (4, 5-tetramethyl-1, 3, 2-dioxaboran-2-yl) imidazo [1,2-a ] pyridine
As in example 12, in the step (3), a pale yellow oily substance was obtained in 86.8% yield.
(4) Preparation of N-ethyl-N-phenyl-6- (2-phenylimidazo [1,2-a ] pyridin-6-yl) quinazolin-4-amine
As in example 12, step (4) was a pink solid in 67.4% yield, melting point 203.0-205.1℃HRMS (ESI): [ M+H ]] + 442.2021。
Example 21
The synthesis of 6- (2-phenylimidazo [1,2-a ] pyridin-6-yl) -N- (pyridin-2-ylmethyl) quinazolin-4-amine (compound No. a 21) comprises the following steps:
(1) Preparation of 4-chloro-6-iodoquinazoline
Step (1) as in example 1.
(2) Preparation of 6-iodo-N- (pyridin-2-ylmethyl) quinazolin-4-amine
As in step (2) of example 1, a pale yellow solid was obtained in 92.1% yield.
(3) Preparation procedure of 2-phenyl-6- (4, 5-tetramethyl-1, 3, 2-dioxaboran-2-yl) imidazo [1,2-a ] pyridine
As in example 12, in the step (3), a pale yellow oily substance was obtained in 86.8% yield.
(4) Preparation of 6- (2-phenylimidazo [1,2-a ] pyridin-6-yl) -N- (pyridin-2-ylmethyl) quinazolin-4-amine
As in example 12, step (4) was performed as a pink solid in 70.2% yield, melting point 141.9-143.3℃HRMS (ESI): [ M+H ]] + 429.1817。
Example 22
The synthesis of 6- (2-phenylimidazo [1,2-a ] pyridin-6-yl) -N- ((tetrahydropyran-4-yl) methyl) quinazolin-4-amine (compound No. a 22) comprises the following steps:
(1) Preparation of 4-chloro-6-iodoquinazoline
Step (1) as in example 1.
(2) Preparation of 6-iodo-N- ((tetrahydropyran-4-yl) methyl) quinazolin-4-amine
Step (2) as in example 1 was a white solid in 90.1% yield.
(3) Preparation procedure of 2-phenyl-6- (4, 5-tetramethyl-1, 3, 2-dioxaboran-2-yl) imidazo [1,2-a ] pyridine
As in example 12, in the step (3), a pale yellow oily substance was obtained in 86.8% yield.
(4) Preparation of 6- (2-phenylimidazo [1,2-a ] pyridin-6-yl) -N- ((tetrahydropyran-4-yl) methyl) quinazolin-4-amine
As in example 12, step (4), as a pink solid, yield 69.8%, melting point 127.0-129.3 ℃, HRMS (ESI): [ M+H ]] + 436.2126。
Example 23
The synthesis of N- (cyclopropylmethyl) -6- (2-phenylimidazo [1,2-a ] pyridin-6-yl) quinazolin-4-amine (compound No. a 23) comprises the following steps:
(1) Preparation of 4-chloro-6-iodoquinazoline
Step (1) as in example 1.
(2) Preparation of N- (cyclopropylmethyl) -6-iodoquinazolin-4-amine
As in example 1, step (2) was an off-white solid in 91.2% yield.
(3) Preparation procedure of 2-phenyl-6- (4, 5-tetramethyl-1, 3, 2-dioxaboran-2-yl) imidazo [1,2-a ] pyridine
As in example 12, in the step (3), a pale yellow oily substance was obtained in 86.8% yield.
(4) Preparation of N- (cyclopropylmethyl) -6- (2-phenylimidazo [1,2-a ] pyridin-6-yl) quinazolin-4-amine
As in example 12, step (4) was performed as a white solid in 41.6% yield, melting point 137.1-139.0 ℃, HRMS (ESI): [ M+H ]] + 392.1870。
Table 1 shows the target compounds obtained in the above examples A1 to A23 1 H NMR data
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Table 2 shows the target compounds obtained in the above examples A1 to A23 13 C NMR data
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Biological experiments
1. Detection of tumor proliferation inhibitory Activity of inventive Compounds Using MTT method
The method comprises the following steps: in vitro culture of HCC827 (human non-small cell lung cancer cell), A549 (human non-small cell lung cancer cell), SH-SY5Y (human nerve)Blastoma cells), HEL (human erythrocytes and leucocytes leukemia cells), MCF-7 (human breast cancer cells) and LX2 (human hepatic stellate cells), cells were isolated at 37℃with 5% CO 2 Culturing in incubator under the condition until logarithmic phase. The cells are inoculated in 96-well plates with the inoculation density of 3000-5000 cells per well and 100 mu L per well, then the cells are continuously cultured in a cell culture box for 24 hours, 100 mu L of medicine-containing culture medium is respectively added into each well, 3 compound wells are arranged at each concentration, and blank control wells are arranged at the same time. After further incubation for 72h, 20. Mu.L of 5 mg.mL was added -1 After continuous culture for 4 hours under the same conditions, the culture solution is discarded, 150 mu L of DMSO is added to each well to dissolve formazan, the plate shaker is vibrated for 10min, and the OD value at the wavelength of 490nm is measured in an enzyme-labeling instrument. Cell viability% = (OD Average value of samples /OD Average value of control ) X 100%. Inhibition% = 100-cell viability%. The results are shown in Table 3.
Table 3 shows the antiproliferative activity of the compounds of examples A1-A23 described above on tumor cells
Analysis according to the test results in table 3: (1) When esters are synthesized, the antiproliferative activity of methyl esters is generally higher than ethyl esters; (e.g., A9 and A4, A7 and A2, etc.); (2) When esters are synthesized and R2 is a benzene ring, the introduction of an electron withdrawing group (e.g., F) on the benzene ring helps to increase the antiproliferative activity of the compounds. (3) The antiproliferative activity is best when synthesizing amines, wherein the R3 substituent is benzene. And introducing electron withdrawing group F into benzene ring can reduce antiproliferative activity of the compound; (4) The synthesized amine compounds have better antiproliferative activity than ester compounds. Of these, representative compounds A1, A22 and A23 have strong antitumor effect, and they have IC against HCC827 50 The values were 78nM, 87nM and 39nM, respectively. The active compounds have good safety and are suitable for human liverIC of astrocytes 50 The value is significantly greater than the IC of the gene against tumor cells 50 Values.
2. Preferably, the activity of the active compound A22 on PI3K alpha kinase is detected.
To evaluate the in vitro kinase inhibitory activity of a22 on pi3kα, the kinase activity of pi3kα was tested using the ADP-GloTM Max assay, HS-173, a known pi3kα inhibitor as a positive control. As shown in Table 3, A22 significantly inhibited the kinase activity of PI3K alpha with an IC50 value of 1.94nM. This suggests that compound 13K may act as a potential inhibitor of PI3kα.
Table 4 shows the inhibitory activity (IC 50 nM) of the preferred active compounds A11, A22 and A23 against PI3K alpha kinase.
3. Preferably the influence of active compound A22 on the PI3K signaling pathway in HCC827 (human non-small cell lung cancer cell)
Abnormal expression of the PI3K signaling pathway is closely related to the process of tumorigenesis. Since 13K significantly inhibited PI3kα activity, we performed analysis by Westernblot in order to further verify whether 13K could modulate downstream targets by inhibiting PI3K/AKT pathways. As shown in fig. 1, the phosphorylation level of PI3K was significantly reduced in a dose-dependent manner after a22 treatment. The phosphorylation levels of the downstream proteins AKT, mTOR and GSK3 beta are correspondingly reduced. These results confirm the inhibitory effect of the compounds on PI3K pathway expression. In addition, BRD4 is a transcriptional regulator, playing a key role in the development of cancer and gene expression. Therefore, we also discuss the influence of the compounds on BRD4, and as shown in figure 1, A22 is found to obviously reduce the protein level of BRD4 and a downstream target point c-Myc thereof, which indicates that A22 inhibits the BRD4 to exert anti-tumor activity.
4. Preferably, active compound a22 induces G2/M phase retardation of HCC827 cells.
HCC827 cells were seeded in six well plates, treated with specific concentrations of compound a22 for 48 hours, collected and washed with PBS buffer, fixed overnight with pre-chilled 70% ethanol at-20 ℃, the supernatant discarded, washed with PBS buffer, stained with a mixture of Propidium Iodide (PI) and RNase, incubated at room temperature in the dark for 30 minutes, and then detected with a flow cytometer. The results show, as shown in figure 2, that cells had a significant G2/M phase arrest after 48 hours of compound treatment compared to the control group, with increasing concentrations, the percentage of cells in the G2/M phase gradually increasing from 20.84% -52.21%.
5. Preferably, active compound a22 induces apoptosis of HCC827 cells
Apoptosis was detected by flow cytometry after staining with annexin v-FITC and Propidium Iodide (PI). HCC827 cells were seeded in 6-well plates overnight and treated with compound a22 at a specific concentration for 48 hours. Cells were collected, incubated with 5. Mu.L of annexin V-FITC and 5. Mu.L of LPI for 15-20 minutes in the dark, and then analyzed by flow cytometry. The results show a dose-dependent increase in the number of early and late apoptotic cells induced by the compounds from 1.73% -37.61%, as shown in figure 3.
Finally, what should be said is: the above embodiments are only for illustrating the technical aspects of the present invention, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention, which is intended to be encompassed by the claims.

Claims (3)

  1. A 6- (imidazo [1,2-a ] pyridin-6-yl) quinazoline compound, characterized in that said compound is selected from the group consisting of:
    (A1) 6- (4- ((cyclopropylmethyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylic acid ethyl ester
    (A2) 6- (4- ((pyridin-2-ylmethyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylic acid ethyl ester
    (A3) 6- (4- ((2-Fluorobenzyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylic acid ethyl ester
    (A4) 6- (4- ((3-fluorophenyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylic acid ethyl ester
    (A5) 6- (4- ((2, 3-difluorophenyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylic acid ethyl ester
    (A6) 6- (4- (Ethyl (phenyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylic acid ethyl ester
    (A7) 6- (4- ((pyridin-2-ylmethyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylic acid methyl ester
    (A8) 6- (4- ((2-Fluorobenzyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylic acid methyl ester
    (A9) 6- (4- ((3-fluorophenyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylic acid methyl ester
    (A10) 6- (4- (methyl (p-toluene) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylic acid methyl ester
    (A11) 6- (4- ((cyclopropylmethyl) amino) quinazolin-6-yl) imidazo [1,2-a ] pyridine-2-carboxylic acid methyl ester
    (A12) N- (2-fluorobenzyl) -6- (2-phenylimidazo [1,2-a ] pyridin-6-yl) quinazolin-4-amine
    (A13) N- (2-fluorobenzyl) -6- (2- (4-fluorophenyl) imidazo [1,2-a ] pyridin-6-yl) quinazolin-4-amine
    (A14) N- (2, 3-difluorophenyl) -6- (2-phenylimidazo [1,2-a ] pyridin-6-yl) quinazolin-4-amine
    (A15) N- (2, 3-difluorophenyl) -6- (2- (4-fluorophenyl) imidazo [1,2-a ] pyridin-6-yl) quinazolin-4-amine
    (A16) N- (cyclopropylmethyl) -6- (2- (4-fluorophenyl) imidazo [1,2-a ] pyridin-6-yl) quinazolin-4-amine
    (A17) 6- (2-phenylimidazo [1,2-a ] pyridin-6-yl) -N- (1H-pyrazol-3-yl) quinazolin-4-amine
    (A18) 6- (2-Cyclopropylimidazo [1,2-a ] pyridin-6-yl) -N- (cyclopropylmethyl) quinazolin-4-amine
    (A19) 6- (2-Cyclopropylimidazo [1,2-a ] pyridin-6-yl) -N-ethyl-N-phenylquinazolin-4-amine
    (A20) N-ethyl-N-phenyl-6- (2-phenylimidazo [1,2-a ] pyridin-6-yl) quinazolin-4-amine
    (A21) 6- (2-phenylimidazo [1,2-a ] pyridin-6-yl) -N- (pyridin-2-ylmethyl) quinazolin-4-amine
    (A22) 6- (2-phenylimidazo [1,2-a ] pyridin-6-yl) -N- ((tetrahydropyran-4-yl) methyl) quinazolin-4-amine
    (A23) N- (cyclopropylmethyl) -6- (2-phenylimidazo [1,2-a ] pyridin-6-yl) quinazolin-4-amine.
  2. 2. The compound of claim 1, wherein the compound comprises a pharmaceutically acceptable salt.
  3. 3. Use of a 6- (imidazo [1,2-a ] pyridin-6-yl) quinazoline compound according to any one of claims 1-2 for the manufacture of an anti-tumour medicament.
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