CN112079775B - Synthesis method of 5-trifluoromethyl isoquinoline-8-formic acid - Google Patents

Synthesis method of 5-trifluoromethyl isoquinoline-8-formic acid Download PDF

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CN112079775B
CN112079775B CN202011049648.XA CN202011049648A CN112079775B CN 112079775 B CN112079775 B CN 112079775B CN 202011049648 A CN202011049648 A CN 202011049648A CN 112079775 B CN112079775 B CN 112079775B
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isoquinoline
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CN112079775A (en
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晋浩文
徐卫良
徐炜政
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SUZHOU KANGRUN PHARMACEUTICALS Inc
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    • C07D217/00—Heterocyclic compounds containing isoquinoline or hydrogenated isoquinoline ring systems
    • C07D217/02—Heterocyclic compounds containing isoquinoline or hydrogenated isoquinoline ring systems with only hydrogen atoms or radicals containing only carbon and hydrogen atoms, directly attached to carbon atoms of the nitrogen-containing ring; Alkylene-bis-isoquinolines

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Abstract

The invention discloses a method for synthesizing 5-trifluoromethyl isoquinoline-8-formic acid, which comprises the steps of taking 4-trifluoromethyl phenethylamine as a raw material, carrying out amino protection, ring closing, hydrolysis, bromination, debromination and alkene insertion and dehydroaromatization on the 4-trifluoromethyl phenethylamine and TFAA to obtain 5-trifluoromethyl isoquinoline, carrying out 8-bit bromination on NBS to obtain 8-bromo-5-trifluoromethyl isoquinoline, and carrying out carbonyl insertion and hydrolysis to obtain 5-trifluoromethyl isoquinoline-8-formic acid. The method has the advantages of simple synthetic route, reasonable process selection, low raw material cost, simple and easily obtained raw materials, convenient operation and post-treatment, high total yield, no use of highly toxic reagents, easy amplification and large-scale production.

Description

Synthesis method of 5-trifluoromethyl isoquinoline-8-formic acid
Technical Field
The invention belongs to the technical field of synthesis of drug intermediates, and particularly relates to a synthesis method of 5-trifluoromethyl isoquinoline-8-formic acid.
Background
5-trifluoromethyl isoquinoline-8-formic acid is a medical intermediate of Guan25589, and a good carboxyl modification group located at the 8 th position has wide application in the design of the prodrug. The lipid solubility of the original medicine is enhanced, the oral absorption effect is improved and the blood concentration is increased by preparing the esterified prodrug. Trifluoromethyl, as one of the fluorine-containing substituent groups, also has many excellent properties in terms of improvement of the pharmacodynamic structure. 5-trifluoromethylisoquinoline-8-carboxylic acid is therefore frequently used as a modifying group to improve the activity of drug candidate molecules. Wherein Garcia Collazo et al developed a heteroaryl aminoisoquinoline structure. The main role is to bind to the variant β -galactosidase protein, to form a stable protein-partner complex, to enable stable presence at neutral pH, and safe degradation of the incoming lysosome (WO 2016120808 al. 2016). Wherein, the introduction of the 5-trifluoromethyl isoquinoline can effectively enhance the binding force with beta-galactosidase protein. Steinig AG et al synthesized a novel isoquinoline pyrazolylaminopyridine derivative for inhibiting tyrosine kinase. For the prevention and treatment of various diseases and disorders, such as cancer, and the like. The novel compounds can also be used for the treatment and prevention of diseases associated with meschymal-epithelial transition (MET). The introduction of trifluoromethyl at the 5-position of isoquinoline can also effectively improve the inhibitory activity. (US 8178668B 2) because 5-trifluoromethyl isoquinoline-8-carboxylic acid is an excellent medical intermediate, it has attracted a lot of attention in the organic synthesis community, especially in the medicinal chemistry community. The research and development work of synthesizing 5-trifluoromethyl isoquinoline-8-formic acid which is used as a modifying group to improve the properties of the original lead compound so as to obtain efficient drug candidate molecules is also orderly carried out. Therefore, the development of a simple and efficient synthesis method of 5-trifluoromethyl isoquinoline-8-formic acid is particularly important.
At present, no synthetic route of 5-trifluoromethyl isoquinoline-8-formic acid exists, but only a synthetic route of 5-trifluoromethyl isoquinoline is provided, 2-trifluoromethyl cinnamic acid and azido diphenyl phosphonate react to generate 1-chloro-5-trifluoromethyl isoquinoline through a ring closing reaction, but a subsequent synthetic step is lacked, so that the subsequent synthetic method needs to be expanded and extended.
Disclosure of Invention
The invention aims to provide a method for synthesizing 5-trifluoromethyl isoquinoline-8-formic acid, which fills the blank of synthesizing 5-trifluoromethyl isoquinoline-8-formic acid in the market. The synthetic method avoids the defects of unavailable synthetic route reagents, troublesome post-treatment, difficult amplification, high cost and the like.
In order to achieve the purpose, the invention provides the following technical scheme:
the synthesis method of 5-trifluoromethyl isoquinoline-8-formic acid comprises the following steps:
(1) Synthesis of 2, 2-trifluoro-N- (2-trifluoromethyl) phenylacetamide
4-trifluoromethyl phenethylamine and trifluoroacetic anhydride are taken as raw materials to carry out dehydration condensation reaction to synthesize 2, 2-trifluoro-N- (2-trifluoromethyl) phenylacetamide;
(2) Synthesis of 2, 2-trifluoro-1- [5- (trifluoromethyl) -3, 4-dihydroisoquinolin-2 (1H) -yl ] ethan-1-one
Taking the 2, 2-trifluoro-N- (2-trifluoromethyl) phenylacetamide synthesized in the step (1) and paraformaldehyde as raw materials to carry out a ring closing reaction to synthesize 2, 2-trifluoro-1- [5- (trifluoromethyl) -3, 4-dihydroisoquinoline-2 (1H) -yl ] ethane-1-ketone;
(3) Synthesis of 5- (trifluoromethyl) -1-tetrahydroisoquinoline
Adding the 2, 2-trifluoro-1- [5- (trifluoromethyl) -3, 4-dihydroisoquinoline-2 (1H) -yl ] ethane-1-ketone synthesized in the step (2) into an ethanol solution, adding a potassium carbonate aqueous solution, heating and refluxing to perform amide hydrolysis reaction, and synthesizing 5- (trifluoromethyl) -1-tetrahydroisoquinoline;
(4) Synthesis of 5- (trifluoromethyl) -3, 4-dihydroisoquinoline
The compound 5- (trifluoromethyl) -1-tetrahydroisoquinoline and N-bromosuccinimide are taken as raw materials to have bromination reaction, and then the bromination reaction is carried out in 30 percent sodium hydroxide aqueous solution to synthesize the 5- (trifluoromethyl) -3, 4-dihydroisoquinoline;
(5) Synthesis of 5-trifluoromethyl isoquinoline
Taking a compound 5- (trifluoromethyl) -3, 4-dihydroisoquinoline as a raw material and manganese dioxide as a reaction reagent to perform oxidative dehydrogenation and aromatization to synthesize 5-trifluoromethyl isoquinoline;
(6) Synthesis of 8-bromo-5-trifluoromethyl isoquinoline
Taking a compound 5-trifluoromethyl isoquinoline as a raw material, N-bromosuccinimide as a reaction reagent and concentrated sulfuric acid as a reaction solvent, and carrying out selective bromination reaction at a 5-position to synthesize 8-bromo-5-trifluoromethyl isoquinoline;
(7) Synthesis of 5-trifluoromethyl isoquinoline-8-carboxylic acid methyl ester
Taking a compound 8-bromo-5-trifluoromethyl isoquinoline as a raw material, taking N, N-dimethylformamide and methanol as solvents to perform an insertion carbonyl reaction, and synthesizing 5-trifluoromethyl isoquinoline-8-carboxylic acid methyl ester;
(8) Synthesis of 5-trifluoromethyl isoquinoline-8-formic acid
And (3) carrying out hydrolysis reaction on the 5-trifluoromethyl isoquinoline-8-carboxylic acid methyl ester to synthesize the 5-trifluoromethyl isoquinoline-8-formic acid.
Further, the specific synthesis steps of the step (1) are as follows:
adding DCM, 4-trifluoromethyl phenethylamine and TEA into a three-necked bottle, slowly cooling the mixed solution to 5 ℃, slowly dropwise adding TFAA trifluoroacetic anhydride, controlling the temperature to be below 10 ℃, after dropwise adding, slowly heating the mixed solution to normal temperature and stirring for reaction; after the reaction is finished, adding 10% hydrochloric acid solution, uniformly stirring, separating mixed solution, adding saturated sodium carbonate aqueous solution into the organic phase, washing, concentrating and drying to obtain the 2, 2-trifluoro-N- (2-trifluoromethyl) phenylacetamide.
Further, the specific synthesis steps of the step (2) are as follows:
respectively adding acetic acid and concentrated sulfuric acid into a three-neck flask, adding a compound 2, 2-trifluoro-N- (2-trifluoromethyl) phenylacetamide and paraformaldehyde when the temperature of a reaction solution is reduced to below 15 ℃, and stirring the mixed solution at normal temperature for reaction; after the reaction is finished, adding ice water, extracting the water phase by using ethyl acetate, combining the organic phases, and adding a saturated sodium carbonate aqueous solution for washing; separating organic phase, drying with anhydrous sodium sulfate, concentrating, and oven drying to obtain 2, 2-trifluoro-1- [5- (trifluoromethyl) -3, 4-dihydroisoquinoline-2 (1H) -yl ] ethane-1-ketone.
Further, the specific synthesis steps of the step (3) are as follows:
adding ethanol, compound 2, 2-trifluoro-1- [5- (trifluoromethyl) -3, 4-dihydroisoquinoline-2 (1H) -yl ] ethane-1-ketone and potassium carbonate water solution into a three-mouth bottle respectively, heating the mixed solution to reflux and stirring for reaction; after the reaction is finished, the ethanol is removed by rotary evaporation, the water phase is extracted by DCM, the organic phases are combined, dried by anhydrous sodium sulfate, dried by rotary drying and dried, and the synthesis of the 5- (trifluoromethyl) -1-tetrahydroisoquinoline is obtained.
Further, the specific synthesis steps of the step (4) are as follows:
dissolving a compound 5- (trifluoromethyl) -1-tetrahydroisoquinoline in a DCM solution in a three-necked bottle, adding N-bromosuccinimide, cooling a reaction system to 0 ℃, stirring for reaction, returning the temperature to room temperature, adding a 30% NaOH solution, and stirring for reaction at room temperature; after the reaction is finished, extracting an organic phase, and adding 10% hydrochloric acid to separate a mixed solution; adjusting the pH of the water phase to be 7-9 by saturated sodium carbonate aqueous solution, extracting by DCM, combining organic phases, drying by anhydrous sodium sulfate, concentrating and drying to obtain the 5- (trifluoromethyl) -3, 4-dihydroisoquinoline.
Further, the specific synthesis steps of the step (5) are as follows:
dissolving the compound 5- (trifluoromethyl) -3, 4-dihydroisoquinoline in a toluene solution in a three-neck flask, adding manganese dioxide, heating the mixed solution to 110 ℃, and stirring for reaction; after the reaction is finished, filtering the reaction solution by using diatomite, leaching a filter cake by using ethyl acetate, concentrating an organic phase to obtain a crude product, and further performing column chromatography purification to obtain the 5-trifluoromethyl isoquinoline.
Further, the specific synthesis steps of the step (6) are as follows:
dissolving a compound 5-trifluoromethyl isoquinoline in a concentrated sulfuric acid solution in a three-mouth bottle, heating the mixed solution to 75 ℃, adding N-bromosuccinimide in batches, and stirring for reaction after the addition is finished; after the reaction is finished, cooling the mixed solution to room temperature, pouring the mixed solution into ice, adjusting the pH of the water phase to be 7-9 by using ammonia water, extracting the water phase by using ethyl acetate, combining organic phases, drying and filtering the organic phases through anhydrous sodium sulfate, concentrating the organic phases to obtain a crude product, and further performing column chromatography purification to obtain the 8-bromo-5-trifluoromethyl isoquinoline.
Further, the specific synthesis steps of the step (7) are as follows:
dissolving the compound 8-bromo-5-trifluoromethyl isoquinoline in methanol and DMF in a three-necked flask, and adding PdCl respectively 2 (dppf) and TEA, introducing CO into the mixed solution at 75 ℃, and stirring to react under the pressure of 0.8 MPa; and after the reaction is completed, spin-drying the reaction solution, pouring water and ethyl acetate into the reaction solution to extract a water phase, combining organic phases, drying the organic phases with anhydrous sodium sulfate, spin-drying the organic phases to obtain a crude product, and further performing column chromatography purification to obtain the 5-trifluoromethyl isoquinoline-8-carboxylic acid methyl ester.
Further, the specific synthesis steps of the step (8) are as follows:
pouring a mixed solution of 10% sodium hydroxide aqueous solution and methanol into a three-neck flask, adding a compound 5-trifluoromethyl isoquinoline-8-carboxylic acid methyl ester, and stirring at normal temperature for reaction; and after the reaction is completed, spin-drying methanol, adjusting the pH value of the solution to be weakly acidic by using 10% hydrochloric acid, performing suction filtration to separate out a solid, and drying to obtain the 5-trifluoromethyl isoquinoline-8-formic acid.
Has the advantages that: the invention provides a method for synthesizing 5-trifluoromethyl isoquinoline-8-formic acid, which takes 4-trifluoromethyl phenethylamine as a raw material, has simple synthetic route, reasonable process selection, low raw material cost, simple and easily obtained raw materials, convenient operation and post-treatment, high total yield, no use of highly toxic reagents, easy amplification and large-scale production.
Drawings
FIG. 1 shows a reaction scheme for synthesizing 5-trifluoromethylisoquinoline-8-carboxylic acid.
Detailed Description
The present invention is further described below with reference to specific examples, which are only exemplary and do not limit the scope of the present invention in any way. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention, and that such changes and substitutions are intended to be within the scope of the invention.
The synthesis process of the 5-trifluoromethyl isoquinoline-8-formic acid comprises the steps of carrying out amino protection, ring closing, hydrolysis, bromination, debromination and vinylon insertion on a 4-trifluoromethyl phenethylamine raw material and TFAA, carrying out dehydroaromatization to obtain 5-trifluoromethyl isoquinoline, carrying out 8-bit bromination on NBS to obtain 8-bromo-5-trifluoromethyl isoquinoline, and carrying out carbonyl insertion and hydrolysis to obtain 5-trifluoromethyl isoquinoline-8-formic acid, wherein the reaction formula is shown in figure 1.
The specific synthetic steps are as follows:
the first step is as follows: synthesis of 2, 2-trifluoro-N- (2-trifluoromethyl) phenylacetamide
100 mL of DCM was added into a 200 mL three-necked flask, 4-trifluoromethylphenethylamine (9.52 g, 50.4 mmol) and 14 mL of TEA were added respectively, the mixture was slowly cooled to 5 ℃, TFAA (13.8 g,65.7 mmol) trifluoroacetic anhydride was slowly added dropwise, the temperature was controlled below 10 ℃, the dropwise addition was completed, the mixture was slowly warmed to room temperature and stirred for reaction. And monitoring the reaction by TLC, adding 100 mL of 10% hydrochloric acid solution after the reaction is finished, uniformly stirring, separating a mixed solution, adding a saturated sodium carbonate aqueous solution into an organic phase, washing, concentrating and drying to obtain 14.0 g of a light yellow solid compound with the yield of 97.5%. The product was used in the next reaction without purification.
1 H NMR (400 MHz, DMSO-d6) δ 9.59 (s, 1H,-NH), 7.70 (d, J = 7.9 Hz, 1H, ArH), 7.63 (t, J = 7.5 Hz, 1H, ArH), 7.45 (t, J = 7.9 Hz, 2H, ArH), 3.46 (dd, J = 13.5, 6.8 Hz, 2H,-CH 2 ), 2.98 (t, J = 7.2 Hz, 2H, -CH 2 ).ESI + -MS, m /z: 286.1[M+H] + 。
The second step is that: synthesis of 2, 2-trifluoro-1- [5- (trifluoromethyl) -3, 4-dihydroisoquinolin-2 (1H) -yl ] ethan-1-one
50 mL of acetic acid and 50 mL of concentrated sulfuric acid are respectively added into a 200 mL three-necked flask, after the temperature of the reaction solution is reduced to below 15 ℃, the compound 2, 2-trifluoro-N- (2-trifluoromethyl) phenylacetamide (14.2 g, 49.8 mmol) and paraformaldehyde (2.24 g,74.7 mmol) are added, the mixed solution is stirred at normal temperature for reaction, TLC is used for monitoring the reaction, after the reaction is finished, 500 mL of ice water is added, the aqueous phase is extracted by ethyl acetate (300 mL multiplied by 3), the organic phases are combined, and saturated aqueous sodium carbonate solution is added for washing. The organic phase was separated, dried over anhydrous sodium sulfate, concentrated and dried to give 13.1 g of compound as yellow crystals in 88.5% yield. The product was used in the next reaction without purification.
1 H NMR (400 MHz, DMSO-d6) δ 7.62 (dd, J = 16.5, 8.3 Hz, 2H, ArH), 7.45 (t, J = 7.8 Hz, 1H, ArH), 4.85 (d, J = 14.5 Hz, 2H, -CH 2 ), 3.93 – 3.77 (m, 2H, -CH 2 ), 3.13 – 2.99 (m, 2H, -CH 2 ).ESI + -MS, m /z: 298.1[M+H] + 。
The third step: synthesis of 5- (trifluoromethyl) -1-tetrahydroisoquinoline
200 mL of ethanol, the compound 2, 2-trifluoro-1- [5- (trifluoromethyl) -3, 4-dihydroisoquinolin-2 (1H) -yl ] ethan-1-one (13.1 g, 44.1 mmol) and 50 mL of an aqueous solution of potassium carbonate (520 g/L) were added to a 500 mL three-necked flask, and the mixture was heated to reflux and stirred for reaction. The reaction was monitored by TLC, after the reaction was complete, the ethanol was removed by rotary evaporation, the aqueous phase was extracted with DCM (100 mL. Times.3), the organic phases were combined, dried over anhydrous sodium sulfate, dried by rotary evaporation and oven dried to give 8.51 g of compound as a pale yellow liquid in 95.9% yield. The product was used in the next reaction without purification.
1 H NMR (400 MHz, DMSO-d6) δ 7.48 (dd, J = 8.6, 5.7 Hz, 1H, ArH), 7.35 – 7.25 (m, 2H, ArH), 3.91 (s, 2H, -CH 2 ), 2.96 (t, J = 5.9 Hz, 2H, -CH 2 ), 2.79 (t, J = 5.8 Hz, 2H, -CH 2 ), 2.57 (d, J = 41.9 Hz, 1H, -NH).ESI + -MS, m /z: 202.1[M+H] + 。
The fourth step: synthesis of 5- (trifluoromethyl) -3, 4-dihydroisoquinoline
In a 500 mL three-necked flask, the compound 5- (trifluoromethyl) -1-tetrahydroisoquinoline (9.42 g, 46.8 mmol) was dissolved in 100 mL of a solution of EDCM, NBS (9.18 g, 51.6 mmol) was added, the reaction system was cooled to 0 ℃ and stirred for reaction for 2 hours, the temperature was returned to room temperature, 30 mL of a 30% NaOH solution was added, and the reaction was stirred at room temperature. Monitoring the reaction by TLC, after the reaction is finished, extracting an organic phase, adding 100 mL of 10% hydrochloric acid, and separating a mixed solution; the aqueous phase was adjusted to pH =7 to 9 with saturated aqueous sodium carbonate solution, extracted with dcm (200 mL × 2), and the organic phases were combined, dried over anhydrous sodium sulfate, concentrated, and dried to give the compound as an orange solid 8.61 g. The yield was 92.3%. The product was used in the next reaction without purification.
1 H NMR (400 MHz, DMSO-d6) δ 8.43 (t, J = 2.2 Hz, 1H, ArH), 7.78 (d, J= 7.9 Hz, 1H, ArH), 7.72 (d, J = 7.5 Hz, 1H, ArH), 7.56 (t, J = 7.6 Hz, 1H, ArH), 3.74 – 3.66 (m, 2H, -CH 2 ), 2.81 (t, J = 7.8 Hz, 2H, -CH 2 ).ESI + -MS, m /z: 200.1[M+H] + 。
The fifth step: synthesis of 5-trifluoromethyl isoquinoline
In a 500 mL three-necked flask, the compound 5- (trifluoromethyl) -3, 4-dihydroisoquinoline (25.7 g, 129 mmol) was dissolved in 250 mL of a toluene solution, manganese dioxide (89.9 g,1.03 mol) was added, and the mixture was heated to 110 ℃ and stirred for reaction. The reaction was monitored by TLC, after the reaction was complete, the reaction mixture was filtered through celite, the filter cake was rinsed with ethyl acetate, the organic phase was concentrated to give a crude product, which was further purified by column chromatography (eluent: V (petroleum ether) = 40/1) to give 11.58 g of the compound as a yellow solid. The yield was 45.5%.
1 H NMR (400 MHz, CDCl 3 ) δ: 9.36 (d, J = 0.6 Hz, 1H, ArH), 8.68 (t, J = 5.2 Hz, 1H, ArH), 8.18 (d, J = 8.3 Hz, 1H, ArH), 8.09 (d, J = 7.3 Hz, 1H, ArH), 8.00 – 7.93 (m, 1H, ArH), 7.68 (t, J = 7.8 Hz, 1H, ArH). ESI + -MS, m /z: 198.0[M+H] + 。
And a sixth step: synthesis of 8-bromo-5-trifluoromethyl isoquinoline
250 In a mL three-necked flask, compound 5-trifluoromethylisoquinoline (10.2 g, 51.5 mmol) was dissolved in 100 mL of a concentrated sulfuric acid solution, the mixture was warmed to 75 ℃, NBS (11.9 g, 66.9 mmol) was added in portions, and the reaction was stirred after the addition. And monitoring the reaction by TLC, cooling the mixed solution to room temperature after the reaction is finished, pouring the mixed solution into ice, and adjusting the water phase to pH =7 to 9 by using ammonia water. Ethyl acetate (100 mL × 3) extracts the aqueous phase, combines the organic phases, dries over anhydrous sodium sulfate, filters, concentrates to give a crude product, which is further purified by column chromatography [ eluent; v (Petroleum ether): v (ethyl acetate) =50/1] gives the compound 7.29 g as a pale yellow solid, yield 51.0%.
1 H NMR (400 MHz, CDCl 3 ) δ: 9.36 (d, J = 0.8 Hz, 1H, ArH), 8.68 (d, J = 6.4 Hz, 1H, ArH), 8.18 (d, J = 8.0 Hz, 1H, ArH), 8.09 (d, J = 7.2 Hz, 1H, ArH), 8.00 – 7.93 (m, 1H, ArH), 7.68 (t, J = 7.6 Hz, 1H, ArH). ESI + -MS, m /z: 277.0[M+H] + 。
The seventh step: synthesis of 5-trifluoromethyl isoquinoline-8-carboxylic acid methyl ester
In a 500 mL three-necked flask, the compound 8-bromo-5-trifluoromethylisoquinoline (20.1 g,74.5 mmol) was dissolved in 140 mL of methanol and 60 mL of DMF, and PdCl was added thereto 2 (dppf) (2.01 g, 2.75 mmol) and TEA (11.0 g, 108.7 mmol) were introduced into the mixture at 75 ℃ with CO, and the reaction was stirred at 0.8MPA pressure. The reaction was monitored by TLC, after the reaction was complete, the reaction solution was spin dried, water was poured in 250 mL, the aqueous phase was extracted with ethyl acetate (250 mL × 3), the organic phases were combined, dried over anhydrous sodium sulfate, spin dried to give the crude product, which was further purified by column chromatography [ eluent: v (petroleum ether): v (ethyl acetate) =20/1]14.7 g of a white solid of the compound was obtained in 78.9% yield.
1 H NMR (400 MHz, DMSO-d6) δ 9.71 (s, 1H, ArH), 9.12 (s, 1H, ArH), 8.83 (d, J = 6.0 Hz, 1H, ArH), 8.50 (s, 1H, ArH), 7.95 (d, J = 4.2 Hz, 1H, ArH), 3.98 (s, 3H, -OCH 3 ).m/z: 256.0 [M + H] + 。
Eighth step: synthesis of 5-trifluoromethyl isoquinoline-8-formic acid
In a 250 mL three-necked flask, a mixed solution of 40 mL of a 10% aqueous solution of sodium hydroxide and 120 mL of methanol was poured, and the compound methyl 5-trifluoromethylisoquinoline-8-carboxylate (12.5 g, 49.0 mmol) was added. Stirring and reacting at normal temperature. And monitoring the reaction by TLC, after the reaction is completed, spin-drying methanol, adjusting the pH of the solution to weak acidity by using 10% hydrochloric acid, performing suction filtration to separate out a solid, and drying to obtain 11.3 g of a compound white solid with the yield of 95.5%. 1 H NMR (400 MHz, DMSO-d6) δ 14.17 – 13.35 (m, 1H, -COOH), 9.74 (s, 1H, ArH), 9.14 (s, 1H, ArH), 8.84 (d, J = 6.4 Hz, 1H, ArH), 8.56 (s, 1H, ArH), 8.00 (d, J = 4.0 Hz, 1H, ArH). m/z: 242.0 [M + H] + 。

Claims (9)

  1. The synthesis method of the 1.5-trifluoromethyl isoquinoline-8-formic acid is characterized by comprising the following steps:
    （1）Nsynthesis of (E) -trifluoroacetyl-2-trifluoromethylphenethylamine
    Takes o-trifluoromethyl phenethylamine and trifluoroacetic anhydride as raw materials to carry out dehydration condensation reaction and synthesisN-trifluoroacetyl-2-trifluoromethylphenethylamine;
    (2) Synthesis of 2, 2-trifluoro-1- [5- (trifluoromethyl) -3, 4-dihydroisoquinolin-2 (1H) -yl ] ethan-1-one
    Synthesized by the step (1)NTaking-trifluoroacetyl-2-trifluoromethyl phenethylamine and paraformaldehyde as raw materials to perform a ring closing reaction to synthesize 2, 2-trifluoro-1- [5- (trifluoromethyl) -3, 4-dihydroisoquinoline-2 (1H) -group]Ethane-1-one;
    (3) Synthesis of 5- (trifluoromethyl) -1,2,3, 4-tetrahydroisoquinoline
    Adding the 2, 2-trifluoro-1- [5- (trifluoromethyl) -3, 4-dihydroisoquinoline-2 (1H) -yl ] ethane-1-ketone synthesized in the step (2) into an ethanol solution, adding a potassium carbonate aqueous solution, heating and refluxing to perform amide hydrolysis reaction, and synthesizing 5- (trifluoromethyl) -1,2,3, 4-tetrahydroisoquinoline;
    (4) Synthesis of 5- (trifluoromethyl) -3, 4-dihydroisoquinoline
    With the compound 5- (trifluoromethyl) -1,2,3, 4-tetrahydroisoquinolineNBromo-reaction of bromo-succinimide, and debrominating and olefinating in 30% concentration water solution of sodium hydroxide to synthesize 5- (trifluoromethyl) -3, 4-dihydro isoquinoline;
    (5) Synthesis of 5-trifluoromethyl isoquinoline
    Taking a compound 5- (trifluoromethyl) -3, 4-dihydroisoquinoline as a raw material and manganese dioxide as a reaction reagent to perform oxidative dehydrogenation and aromatization to synthesize 5-trifluoromethyl isoquinoline;
    (6) Synthesis of 8-bromo-5-trifluoromethyl isoquinoline
    The compound 5-trifluoromethyl isoquinoline is taken as a raw material,Ncarrying out selective bromination reaction at the 8-position by using bromosuccinimide as a reaction reagent and concentrated sulfuric acid as a reaction solvent to synthesize 8-bromo-5-trifluoromethyl isoquinoline;
    (7) Synthesis of 5-trifluoromethyl isoquinoline-8-carboxylic acid methyl ester
    Taking a compound 8-bromo-5-trifluoromethyl isoquinoline as a raw material,N，N-dimethyl formamide and methanol are used as solvents to carry out an insertion carbonyl reaction to synthesize 5-trifluoromethyl isoquinoline-8-carboxylic acid methyl ester;
    (8) Synthesis of 5-trifluoromethyl isoquinoline-8-formic acid
    And (3) carrying out hydrolysis reaction on the 5-trifluoromethyl isoquinoline-8-carboxylic acid methyl ester to synthesize the 5-trifluoromethyl isoquinoline-8-formic acid.
  2. 2. The synthesis method according to claim 1, wherein the specific synthesis steps of the step (1) are as follows:
    adding DCM, o-trifluoromethylphenethylamine and TEA into a three-necked bottle, slowly cooling the mixed solution to 5 ℃, slowly adding TFAA dropwise, controlling the temperature to be below 10 ℃, after dropwise addition, slowly heating the mixed solution to normal temperature and stirring for reaction; after the reaction is finished, adding 10% hydrochloric acid solution, stirring uniformly, separating mixed solution, adding organic phase and addingWashing with saturated sodium carbonate water solution, concentrating, and oven drying to obtain the final productN-trifluoroacetyl-2-trifluoromethylphenethylamine.
  3. 3. The synthesis method according to claim 1, wherein the specific synthesis steps of the step (2) are as follows:
    respectively adding acetic acid and concentrated sulfuric acid into a three-neck bottle, cooling the temperature of the reaction solution to below 15 ℃, and adding the compoundN-trifluoroacetyl-2-trifluoromethyl phenethylamine and paraformaldehyde, and stirring the mixed solution at normal temperature for reaction; after the reaction is finished, adding ice water, extracting the water phase by using ethyl acetate, combining the organic phases, and adding saturated sodium carbonate aqueous solution for washing; separating organic phase, drying with anhydrous sodium sulfate, concentrating, and oven drying to obtain 2, 2-trifluoro-1- [5- (trifluoromethyl) -3, 4-dihydroisoquinoline-2 (1H) -yl]Ethane-1-one.
  4. 4. The synthesis method according to claim 1, wherein the specific synthesis steps of the step (3) are as follows:
    respectively adding ethanol, a compound 2, 2-trifluoro-1- [5- (trifluoromethyl) -3, 4-dihydroisoquinoline-2 (1H) -yl ] ethane-1-ketone and a potassium carbonate aqueous solution into a three-necked bottle, and heating the mixed solution to reflux and stir for reaction; after the reaction is finished, the ethanol is removed by rotary evaporation, the water phase is extracted by DCM, the organic phases are combined, dried by anhydrous sodium sulfate, dried by rotary drying and dried, and the 5- (trifluoromethyl) -1,2,3, 4-tetrahydroisoquinoline is prepared.
  5. 5. The synthesis method according to claim 1, wherein the specific synthesis steps of the step (4) are as follows:
    in a three-necked flask, the compound 5- (trifluoromethyl) -1,2,3, 4-tetrahydroisoquinoline is dissolved in DCM solution and addedNCooling the reaction system to 0 ℃ and stirring for reaction, returning the temperature to room temperature, adding 30 percent NaOH solution, and stirring for reaction at room temperature; after the reaction is finished, extracting an organic phase, and adding 10% hydrochloric acid to separate a mixed solution; the aqueous phase is adjusted to pH = 7E with saturated aqueous sodium carbonate solution9, DCM extraction, organic phase combination, anhydrous sodium sulfate drying, concentration, drying, and 5- (trifluoromethyl) -3, 4-dihydroisoquinoline.
  6. 6. The synthesis method according to claim 1, wherein the specific synthesis steps of the step (5) are as follows: dissolving the compound 5- (trifluoromethyl) -3, 4-dihydroisoquinoline in a toluene solution in a three-neck flask, adding manganese dioxide, heating the mixed solution to 110 ℃, and stirring for reaction; after the reaction is finished, filtering the reaction solution by using diatomite, leaching a filter cake by using ethyl acetate, concentrating an organic phase to obtain a crude product, and further performing column chromatography purification to obtain the 5-trifluoromethyl isoquinoline.
  7. 7. The synthesis method according to claim 1, wherein the specific synthesis steps of the step (6) are as follows: dissolving 5-trifluoromethyl isoquinoline in concentrated sulfuric acid solution in a three-neck bottle, heating the mixed solution to 75 ℃, and adding the mixed solution in batchesNBromo-succinimide, stirring for reaction after the addition; and after the reaction is finished, cooling the mixed solution to room temperature, pouring the mixed solution into ice, adjusting the pH of a water phase to be 7-9 by using ammonia water, extracting the water phase by using ethyl acetate, combining organic phases, drying and filtering the organic phases through anhydrous sodium sulfate, concentrating the organic phases to obtain a crude product, and further performing column chromatography purification to obtain the 8-bromo-5-trifluoromethyl isoquinoline.
  8. 8. The synthesis method according to claim 1, wherein the specific synthesis steps of the step (7) are as follows:
    in a three-necked flask, the compound 8-bromo-5-trifluoromethyl isoquinoline is dissolved in methanol and DMF, and PdC1 is added respectively 2 (dppf) and TEA, introducing CO into the mixed solution at 75 ℃, and stirring to react under the pressure of 0.8 MPa; and after the reaction is completed, spin-drying the reaction solution, pouring water and ethyl acetate into the reaction solution to extract a water phase, combining organic phases, drying the organic phases by using anhydrous sodium sulfate, spin-drying the organic phases to obtain a crude product, and further performing column chromatography purification to obtain the 5-trifluoromethyl isoquinoline-8-carboxylic acid methyl ester.
  9. 9. The synthesis method according to claim 1, wherein the specific synthesis steps of the step (8) are as follows:
    pouring a 10% sodium hydroxide aqueous solution and a methanol mixed solution into a three-necked bottle, adding a compound 5-trifluoromethyl isoquinoline-8-carboxylic acid methyl ester, and stirring at normal temperature for reaction; and after the reaction is completed, spin-drying methanol, adjusting the pH value of the solution to subacidity by using 10% hydrochloric acid, performing suction filtration to separate out a solid, and drying to obtain the 5-trifluoromethyl isoquinoline-8-formic acid.
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