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Structure of 777-12-8
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The BI-3802 was designed by Boehringer Ingelheim and could be obtained free of charge through the Boehringer Ingelheim open innovation portal opnMe.com, associated with its negative control.
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Novel amides of mycophenolic acid and some heterocyclic derivatives as immunosuppressive agents
Walczak, Juliusz Maksymilian ; Iwaszkiewicz-Grzes, Dorota ; Ziomkowska, Michalina ; Sliwka-Kaszynska, Magdalena ; Dasko, Mateusz ; Trzonkowski, Piotr , et al.
Abstract: The group of 18 new amide derivatives of mycophenolic acid (MPA) and selected heterocyclic amines was synthesised as potential immunosuppressive agents functioning as inosine-5′-monophosphate dehydrogenase (IMPDH) uncompetitive inhibitors. The synthesis of 14 of them employed uronium-type activating system (TBTU/HOBt/DIPEA) while 4 of them concerned phosphonic acid anhydride method (T3P/Py) facilitating amides to be obtained in moderate to excellent yields without the need of phenolic group protection. Most of optimised protocols did not require complicated reaction work-ups, including chromatographic, solvent-consuming methods. The biological activity assay was performed on the T-Jurkat cell line and peripheral mononuclear blood cells (PBMCs) which are both dedicated for antiproliferative activity determination. Each of designed derivatives was characterised by reduced cytotoxicity and benzoxazole analogue (A2) revealed the most promising activity. Subsequently, an observed structure-activity relationship was discussed.
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Keywords: Mycophenolic acid ; amide derivatives ; heterocycles ; benzoxazole ; IMPDH inhibition
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Purchased from AmBeed: 934-32-7 ; 1477-42-5 ; 5464-79-9 ; 5464-79-9 ; 136-95-8 ; 95-24-9 ; 533-30-2 ; 1123-93-9 ; 6285-57-0 ; 15864-32-1 ; 29927-08-0 ; 348-40-3 ; 58-63-9 ; 4570-41-6 ; 75985-45-4 ; 24280-93-1 ; 2536-91-6 ; 19952-47-7 ; 1747-60-0 ; 777-12-8 ; 63837-12-7 ; 58-63-9
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CAS No. : | 777-12-8 |
Formula : | C8H5F3N2S |
M.W : | 218.20 |
SMILES Code : | NC1=NC2=CC=C(C(F)(F)F)C=C2S1 |
MDL No. : | MFCD00269597 |
InChI Key : | WEDYEBJLWMPPOK-UHFFFAOYSA-N |
Pubchem ID : | 2735955 |
GHS Pictogram: |
![]() ![]() |
Signal Word: | Danger |
Hazard Statements: | H300-H315-H319-H335 |
Precautionary Statements: | P261-P264-P270-P271-P280-P301+P310+P330-P302+P352-P304+P340+P312-P305+P351+P338-P332+P313-P337+P313-P403+P233-P405-P501 |
Class: | 6.1 |
UN#: | 2811 |
Packing Group: | Ⅱ |
Num. heavy atoms | 14 |
Num. arom. heavy atoms | 9 |
Fraction Csp3 | 0.12 |
Num. rotatable bonds | 1 |
Num. H-bond acceptors | 4.0 |
Num. H-bond donors | 1.0 |
Molar Refractivity | 49.03 |
TPSA ? Topological Polar Surface Area: Calculated from |
67.15 Ų |
Log Po/w (iLOGP)? iLOGP: in-house physics-based method implemented from |
1.79 |
Log Po/w (XLOGP3)? XLOGP3: Atomistic and knowledge-based method calculated by |
2.92 |
Log Po/w (WLOGP)? WLOGP: Atomistic method implemented from |
4.06 |
Log Po/w (MLOGP)? MLOGP: Topological method implemented from |
2.32 |
Log Po/w (SILICOS-IT)? SILICOS-IT: Hybrid fragmental/topological method calculated by |
3.38 |
Consensus Log Po/w? Consensus Log Po/w: Average of all five predictions |
2.89 |
Log S (ESOL):? ESOL: Topological method implemented from |
-3.44 |
Solubility | 0.0788 mg/ml ; 0.000361 mol/l |
Class? Solubility class: Log S scale |
Soluble |
Log S (Ali)? Ali: Topological method implemented from |
-3.99 |
Solubility | 0.0223 mg/ml ; 0.000102 mol/l |
Class? Solubility class: Log S scale |
Soluble |
Log S (SILICOS-IT)? SILICOS-IT: Fragmental method calculated by |
-3.5 |
Solubility | 0.0682 mg/ml ; 0.000313 mol/l |
Class? Solubility class: Log S scale |
Soluble |
GI absorption? Gatrointestinal absorption: according to the white of the BOILED-Egg |
High |
BBB permeant? BBB permeation: according to the yolk of the BOILED-Egg |
Yes |
P-gp substrate? P-glycoprotein substrate: SVM model built on 1033 molecules (training set) |
No |
CYP1A2 inhibitor? Cytochrome P450 1A2 inhibitor: SVM model built on 9145 molecules (training set) |
Yes |
CYP2C19 inhibitor? Cytochrome P450 2C19 inhibitor: SVM model built on 9272 molecules (training set) |
No |
CYP2C9 inhibitor? Cytochrome P450 2C9 inhibitor: SVM model built on 5940 molecules (training set) |
No |
CYP2D6 inhibitor? Cytochrome P450 2D6 inhibitor: SVM model built on 3664 molecules (training set) |
No |
CYP3A4 inhibitor? Cytochrome P450 3A4 inhibitor: SVM model built on 7518 molecules (training set) |
No |
Log Kp (skin permeation)? Skin permeation: QSPR model implemented from |
-5.56 cm/s |
Lipinski? Lipinski (Pfizer) filter: implemented from |
0.0 |
Ghose? Ghose filter: implemented from |
None |
Veber? Veber (GSK) filter: implemented from |
0.0 |
Egan? Egan (Pharmacia) filter: implemented from |
0.0 |
Muegge? Muegge (Bayer) filter: implemented from |
0.0 |
Bioavailability Score? Abbott Bioavailability Score: Probability of F > 10% in rat |
0.55 |
PAINS? Pan Assay Interference Structures: implemented from |
0.0 alert |
Brenk? Structural Alert: implemented from |
0.0 alert: heavy_metal |
Leadlikeness? Leadlikeness: implemented from |
No; 1 violation:MW<1.0 |
Synthetic accessibility? Synthetic accessibility score: from 1 (very easy) to 10 (very difficult) |
2.02 |
* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
46% | With isopentyl nitrite; In tetrahydrofuran; for 0.5h;Reflux; | [00180] To a solution of 6-(trifluoromethyl)benzothiazol-2-amine ( 1) (2.00 g, 9.17 mmol) in 20 mL of THF was added isoamyl nitrite (3.22 g, 27.5 mmol). The mixture was heated to reflux for 30 min, quenched with water, and extracted with ethyl acetate. The organic extract was dried over Na2S04and concentrated under reduced pressure. The crude material was purified by silica gel chromatography to afford 860 mg (46%) of the title compound as a yellow solid. NMR (400 MHz, CDC13) delta 9.16 (s, 1H), 8.26 (m, 2H), 7.78 (d, J= 1.2 Hz, 1H). |
43.2% | With isopentyl nitrite; In tetrahydrofuran; for 1.5h;Inert atmosphere; Reflux; | 6-(Trifluoromethyl)benzo[d]thiazol-2-amine (6.8 g, 31.16 mmol)was dissolved in THF (60 mL) under N2. Isoamyl nitrite (8.03 g,68.55 mmol) was added dropwise and the mixture was refluxed for1.5 h. Then the mixture was poured into ice-H2O (60 mL) andextracted with EtOAc. The organic layer was washed by saturatedaqueous NaCl and dried over Na2SO4. It was then concentrated andpurified via flash chromatography on silica gel to get 6 g (Yield43.2%) of 6-(trifluoromethyl)benzo[d]thiazole (21n) as a yellow oil.ES-LCMS m/z: 204.0 (MH). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With bromine; In acetic acid;Cooling with ice; | General procedure: A mixture of 0.1 mol of 4?substituted aniline and 0.1 mol ofPotassium thiocyanate (KCNS) in 100 ml glacial acetic acid (AcOH) was cooled inan ice bath and stirred for 10 to 20 min, and then 0.1 mol bromine in glacialacetic acid was added dropwise at such a rate to keep the temperature below 10C throughout the addition. Theprogress of the reaction was monitored by Thin Layer Chromatography usingtoluene: acetone (8:2) solvent system. The reaction mixture was stirredat room temperature for 2 to 4 hrs, the hydrobromide (HBr) salt thus separatedout was filtered, washed with acetic acid, dried, dissolved in hot water and basified to pH 11.0 with ammonia solution (NH4OH)and the resulting precipitate was filtered, washed with water and dried to getthe desired product 2a-q. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
92% | In a three-necked flask fitted with a condenser, a suspension of copper II chloride (370 mg, 2.75 mmol) in acetonitrile (5 mL) was treated with tert-butyl nitrite (0.41 mL, 3.44 mmol) and stirred at rt for 10 minutes. A solution of 2-amino-6-trifluoromethylbenzthiazole (500 mg, 2.29 mmol) in acetonitrile (1 mL) was then added dropwise. The mixture was heated at 65° C. for 30 minutes, then cooled and diluted with an excess of 1 N aqueous hydrochloric acid solution. The mixture was extracted with ethyl acetate. The organic phase was separated, dried (MgSO4), and concentrated under reduced pressure. An orange semi-solid (501 mg, 92percent) was obtained and used without further purification. 1H NMR (300 MHz, CDCl3) delta 8.10-8.05 (m, 2H), 7.74 (d, 1H); LC-MS m/z 238.2 (MH+), ret. time 3.76 min TLC Rf=0.50 (9:1 hexanes/ethyl acetate). | |
With hydrogenchloride; tert.-butylnitrite; copper dichloride; In acetonitrile; at 20℃; | 8.25 ml tert-butyl nitrite were added to a solution of 7.40 g copper (II) chloride in 120 ml acetonitrile. The reaction mixture was stirred ten minutes at room temperature. Then a solution of 10.0 g 2-Amino-6-(trifluoromethyl)benzonitrile were added. Then 100 ml 1 N HCI were added to the cooled reaction mixture. The reaction mixture was extracted five times with portions of 50 ml ethyl acetate. The combined organic layers were washed with water and the dried over MgSO4. The solvent was removed in vacuo to obtain 9.79 g crude 2-Chloro-6-trifluoromethyl-benzothiazole as a red oil which solidifies upon standing. This material was used without further purification. C8H3CIF3NS (237.63), MS(GC): 237.0 (M+H+), Rf(n-heptane :ethyl acetate = 1 :1) = 0.72 . |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
In ethanol; | the procedure is as in the example 6, starting with 2-amino-6-trifluoromethylbenzothiazole (17.9 g), ethanol (50 cc) and 2-bromoethanol. 2-(2-imino-6-trifluoromethyl-3-benzothiazolinyl)ethanol bromhydrate (10.5 g) is obtained. 2-amino-6-trifluoromethylbenzothiazole may be prepared according to the method described in U.S. Pat. No. 2,822,359. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With pyridine; dmap; In water; | EXAMPLE 2 STR7 At 0 to 5° C., 2-chloro-6-fluorobenzoyl chloride (1.93 g) was added dropwise to a solution composed of 2-amino-6-trifluoromethylbenzothiazole (2.18 g), pyridine (30 ml) and 4-dimethylaminopyridine (0.1 g). The reaction mixture was stirred at room temperature (20 to 30° C.) for one day, and then the pyridine was evaporated. Water was added to the residue, and the mixture was stirred. The resulting crystals were collected by filtration, and thoroughly washed with water. Recrystallization from ethanol gave the desired N-(6-trifluoromethylbenzothiazol-2-yl)-2-chloro-6-fluorobenzamide (2.5 g). mp. 265°-270° C. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With triethylamine; In tetrahydrofuran; | EXAMPLE 1 STR6 At 0 to 5 C., 2,6-difluorobenzoyl chloride (1.77 g) was added dropwise to a solution composed of 2-amino-6-trifluoromethylbenzothiazole (2.18 g), tetrahydrofuran (30 ml) and triethylamine (1.1 g). The reaction mixture was stirred at 30 to 40 C. for 5 hours, and then tetrahydrofuran was evaporated. The solid residue was washed with water and recrystallized from ethanol to give the desired N-(6-trifluoromethylbenzothiazol-2-yl)-2,6-difluorobenzamide (2.8 g). mp. 256-257 C. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
28% | With bromine; acetic acid; at 0 - 20℃; | General procedure: [190] Preparation 1. 6-trifluoromethoxybenzo[d]thiazol-2-amine[191] Ammonium thiocyanate (1.70 g, 22.30 mmol) was added to a solution of 4-(trifluoromethoxy)aniline (3.54 g, 20.00 mmol) in acetic acid (30 mL). The reaction mixture was cooled to 0?10 ?. A solution of bromine (1.10 mL, 22.00 mmol) in acetic acid (5 mL) was added dropwise to the reaction mixture, which was then stirred at room temperature overnight. The resulting solid was filtered, and then dissolved in water. The aqueous layer was basified to pH 11-12 with solid sodium carbonate. The resulting solid was filtered, washed with water, and then dried in vacuo to give the titled compound (2.84 g) as a white solid. The product was used in the subsequent step without further purification (Yield: 61percent). |
28% | With bromine; acetic acid; In water; at 0 - 20℃; | General procedure: Preparation 1. 6-trifluoromethoxybenzo[d]thiazol-2-amine Ammonium thiocyanate (1.70 g, 22.30 mmol) was added to a solution of 4-(trifluoromethoxy)aniline (3.54 g, 20.00 mmol) in acetic acid (30 mL). The reaction mixture was cooled to 0-10° C. A solution of bromine (1.10 mL, 22.00 mmol) in acetic acid (5 mL) was added dropwise to the reaction mixture, which was then stirred at room temperature overnight. The resulting solid was filtered, and then dissolved in water. The aqueous layer was basified to pH 11-12 with solid sodium carbonate. The resulting solid was filtered, washed with water, and then dried in vacuo to give the titled compound (2.84 g) as a white solid. The product was used in the subsequent step without further purification (Yield: 61percent). |
The more preferred compounds are:2-aminobenzothiazole,2-amino-6-methylbenzothiazole,2-amino-4-methylbenzothiazole,2-amino-6-trifluoromethylbenzothiazole,2-amino-4-trifluoromethylbenzothiazole,2-amino-5-trifluoromethylbenzothiazole,2-amino-6-trifluoromethoxybenzothiazole,2-amino-6-ethoxybenzothiazole,2-amino-6-nitrobenzothiazole,... |
With sulfuric acid; ammonium bromide; at 100℃; for 0.75h; | General procedure: 5,6-Dichloro-1,3-benzothiazol-2-amine To a solution of (3,4-dichlorophenyl)thiourea (1.00 g, 4.52 mmol) in concentrated sulfuric acid (2.3 mL) was added ammonium bromide (438 mg, 4.52 mmol) and the solution heated at 100°C for 45 min. The reaction was allowed to cool to room temperature, then ice/water (34 mL) was added and the solution basified with N(aq). The resulting precipitate was sonicated and then collected by filtration to afford the title compound as a 50percent mixture with the 6,7 dichloro isomer which was taken into the next stage without further purification (1.30g, 48percent purity, 31percent yield); m/z = 218.8 (MH)+. |
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