Indole carboxamide compound, preparation therefor and use thereof

1 . An indole carboxamide compound represented by formula (I) or pharmaceutically acceptable salts thereof:

wherein:

R 1 is selected from a group consisting of hydrogen atom, hydroxyl, aldehyde group, halogen, guanidino, C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, 6- to 14-membered aryl, 5- to 6-membered heteroaryl, C 1-6 alkyloxy, 6- to 14-membered aryloxy, —OCH 2 -6- to 14-membered aryl, —CF 3 , —OCHF 2 , —OCF 3 , —CN, nitro group, carboxyl, —C(O)O—C 1-6 alkyl, —C(O)N—C 1-6 alkyl, amino group, —NHC(O)—C 1-6 alkyl, —S—C 1-6 alkyl, —SO—C 1-6 alkyl, —SO 2 -C 1-6 alkyl or a heterocyclic ring containing 1~4 heteroatoms selected from N, O and S; the C 1-6 alkyl, the 6- to 14-membered aryl or the 5- to 6-membered heteroaryl are optionally substituted with 1 to 5 substituents selected from a group consisting of hydroxyl, nitro group, sulfonic group, halogen, cyano, trifluoromethyl, difluoromethoxy or trifluoromethoxy; and the 5- to 6-membered heteroaryl optionally contain 1 to 6 heteroatoms selected N, O and S;

R 2 is selected from a group consisting of hydrogen atom, C 1-10 alkyl, 6- to 14-membered aryl, 5- to 6-membered heteroaryl, amino group, substituted amino group, amidino group or guanidino; wherein the C 1-10 alkyl, the 6- to 14-membered aryl or the 5- to 6-membered heteroaryl are optionally substituted with 1 to 2 substituents selected from a group consisting of hydroxyl, nitro group, halogen, cyano, trifluoromethyl, 6- to 8-membered aryl, trifluoromethoxy or difluoromethoxy; and the 5- to 6-membered heteroaryl optionally contain 1 to 6 heteroatoms selected from N, O and S.

2 . The indole carboxamide compound represented by formula (I) or pharmaceutically acceptable salts thereof according to claim 1 , wherein in the formula (I):

R 1 is selected from a group consisting of hydrogen atom, hydroxyl, aldehyde group, halogen, 6- to 14-membered aryl group, —CN, amino group or nitro group;

R 2 is selected from a group consisting of hydrogen atom, C 1-6 alkyl or phenyl.

3 . The indole carboxamide compound represented by formula (I) or pharmaceutically acceptable salts thereof according to claim 1 , wherein the indole carboxamide compound is selected from the following compounds or pharmaceutically acceptable salts thereof:

4 . A method for preparing the indole carboxamide compound represented by formula (I) or pharmaceutically acceptable salts thereof according to claim 1 , which is either one of the following two methods:

wherein, R 1 and R 2 are defined as in claim 1 ;

compound A is dissolved in anhydrous dichloromethane (CH 2 Cl 2 ), 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDCI) is dissolved in anhydrous CH 2 Cl 2 , and β-alanine ethyl ester and 4-dimethylaminopyridine (DMAP) are dissolved in anhydrous CH 2 Cl 2 , and then the three solutions are mixed to react under stirring in an ice bath, and then reacted at room temperature, and the reaction is monitored by TLC until it is complete;

then the reaction is quenched by adding saturated ammonium chloride (NH 4 Cl) solution drop by drop and thus obtained mixture is extracted with CH 2 Cl 2 , lower layer solution is collected, dried with anhydrous sodium sulfate (Na 2 SO 4 ), filtered, concentrated, and purified by column chromatography to give product B;

the product B obtained above is dissolved in anhydrous tetrahydrofuran (THF) under stirring, following by adding diisobutylaluminum hydride (DIBAl-H) drop by drop, the reaction is carried out at 0° C. and monitored by TLC until it is complete; then methanol (MeOH) is added drop by drop to quench the reaction, and a small amount of methyl tertiary-butyl ether (MTBE) is added to dilute reaction system, and saturated sodium potassium tartrate solution is added to further quench reaction, and stirring is continued until the reaction system is clarified; after clarification, reaction system is extracted with ethyl acetate (EtOAc), organic phases are combined, washed with a small amount of saturated brine, and then organic phases are dried with anhydrous Na 2 SO 4 , and then concentrated after a few moments of standing, and then purified by column chromatography to give product C;

the product C obtained above is dissolved in anhydrous CH 2 Cl 2 under stirring, followed by successively adding triethylamine (Et 3 N) and DMAP at room temperature, and finally compound R 2 COOH or its anhydride, or its acyl chloride R 2 COCl is added drop by drop to initiate reaction; reaction is monitored by TLC until it is complete; saturated NH 4 Cl solution is added drop by drop to quench reaction, thus obtained mixture is extracted with ethyl acetate, organic phases are combined, washed with a small amount of saturated brine, dried with anhydrous Na 2 SO 4 , filtered, concentrated, and purified by column chromatography to give product D;

wherein, R 1 and R 2 are defined as in claim 1 ;

3-aminopropanol is dissolved in anhydrous CH 2 Cl 2 , followed by adding imidazole and 4-dimethylaminopyridine (DMAP), and finally triethylchlorosilane (TESCl) is added under stirring at room temperature, and reaction is monitored by TLC until it is complete; saturated NH 4 Cl solution is added drop by drop to quench reaction, and then thus obtained is extracted with ethyl acetate, organic phases are combined, washed with a small amount of saturated brine, and then dried with anhydrous Na 2 SO 4 , filtered, concentrated, and purified by column chromatography to give 3-triethylsilyloxy-1-propanamine;

the compound A is dissolved in anhydrous CH 2 Cl 2 , 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDCI) is dissolved in anhydrous CH 2 Cl 2 , 3-triethylsilyloxy-1-propanamine and DMAP are dissolved in anhydrous CH 2 Cl 2 , and then the above three solutions are mixed, and thus obtained mixture is stirred in an ice bath and then reacted at room temperature, and reaction is monitored by TLC until it is complete; thus obtained mixture is extracted with CH 2 Cl 2 , and lower layer solution is collected and dried overnight with anhydrous Na 2 SO 4 , then filtered and concentrated, and purified by column chromatography to give product E;

the compound E is dissolved in anhydrous tetrahydrofuran (THF), followed by adding a small amount of tetrabutylammonium fluoride (TBAF) under stirring at room temperature and reaction is monitored by TLC until it is complete; the reaction is quenched by adding saturated NH 4 Cl solution drop by drop, thus obtained mixture is extracted with EtOAc, and organic phases are combined, washed with a small amount of saturated brine, dried with anhydrous Na 2 SO 4 , filtered, concentrated, and purified by column chromatography to give product C;

the product C obtained above is dissolved in anhydrous CH 2 Cl 2 under stirring, followed by successively adding triethylamine (Et 3 N) and DMAP at room temperature, and finally compound R 2 COOH or its anhydride, or its acyl chloride R 2 COCl is added drop by drop to initiate reaction; the reaction is monitored by TLC until it is complete; saturated NH 4 Cl solution is added drop by drop to quench the reaction, thus obtained mixture is extracted with EtOAc, organic phases are combined, washed with a small amount of saturated brine, dried with anhydrous Na 2 SO 4 , filtered, concentrated, and purified by column chromatography to give product D.

5 . A method of inhibiting transient receptor potential canonical channel 6 (TRPC6) in a subject in need thereof, comprising administering to the subject an effective amount of the indole carboxamide compound represented by formula (I) or pharmaceutically acceptable salts thereof according to claim 1 .

6 . A method of inhibiting transient receptor potential canonical channel 6 (TRPC6) channel-mediated Ca 2+ entry in a subject in need thereof, comprising administering to the subject an effective amount of the indole carboxamide compound represented by formula (I) or pharmaceutically acceptable salts thereof according to claim 1 .

7 . A method of treating a disease selected from the group consisting of nephropathy, sepsis, arthritis, pulmonary hypertension and tumor in a subject in need thereof, comprising administering to the subject an effective amount of the indole carboxamide compound represented by formula (I) or pharmaceutically acceptable salts thereof according to claim 1 .

8 . The method Use-according to claim 7 , wherein

the nephropathy is a primary glomerular disease, including primary nephrotic syndrome, IgA nephropathy, acute glomerulonephritis, focal segmental glomerulosclerosis, renal fibrosis, idiopathic membranous nephropathy, and membranoproliferative glomerulonephritis; metabolic disease-associated renal damage, including diabetic nephropathy, hyperuricemic nephropathy and obesity-related glomerulopathy; chronic renal failure, including cardiovascular complications due to renal anemia and chronic renal failure; and infection-related renal damage, including hepatitis B virus-related nephritis, and renal lesion due to infective endocarditis;

the sepsis comprises sepsis and septic shock caused by a variety of different pathogenic bacteria, including, but not limited to: Staphylococcus aureus septicemia, septicemia caused by Staphylococcus epidermidis, Enterococcal septicemia , gram-negative Bacillus septicemia, anaerobic bacteria septicemia, fungal septicemia and septic shock;

the pulmonary hypertension comprises, but is not limited to, pulmonary arterial hypertension, pulmonary hypertension caused by left heart disease, pulmonary hypertension caused by hypoxia and/or lung disease, chronic thromboembolic pulmonary hypertension, pulmonary hypertension due to multiple mechanisms and/or unknown mechanisms;

the tumor comprises a malignant tumor; the malignant tumor comprises, but is not limited to: glioma, esophageal cancer, renal cancer, pancreatic cancer, breast cancer, lung cancer, liver cancer and colorectal cancer.

9 . A pharmaceutical composition comprising the indole carboxamide compound represented by formula (I) or pharmaceutically acceptable salts thereof according to claim 1 and a pharmaceutically acceptable excipient.

10 . The indole carboxamide compound represented by formula (I) or pharmaceutically acceptable salts thereof according to claim 1 , wherein in the formula (I):

R 1 is selected from a group consisting of hydrogen atom, aldehyde group, amino group and phenyl;

R 2 is selected from a group consisting of C 1-3 alkyl and phenyl.

11 . The indole carboxamide compound represented by formula (I) or pharmaceutically acceptable salts thereof according to claim 1 , wherein the indole carboxamide compound is selected from the following compounds or pharmaceutically acceptable salts thereof:

12 . The indole carboxamide compound represented by formula (I) or pharmaceutically acceptable salts thereof according to claim 1 , wherein the indole carboxamide compound is selected from a group consisting of the following compound and pharmaceutically acceptable salts thereof: