propanimidamide;hydrochloride

Conditions: temp:55.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Sodium (356 mg, 15.5 mmol) was carefully added to ethanol (5.9 mL) to prepare sodium ethoxide solution in ethanol. The above freshly prepared ethanol solution (3.5 mL) was added to a stirred suspension of propionimidamide hydrochloride (1.05 g, 9.69 mmol). The mixture was warmed to 55° C., then the heating bath was removed and a solution of mucobromic acid (1 g, 3.87 mmol) in ethanol was added dropwise at a rate which maintained a constant temperature, followed by a further sodium ethoxide solution (2 mL). After cooling, the mixture was filtered and evaporated to a residue which was shaken vigorously with hydrochloric acid (2 M×2.4 mL). The brown precipitate was filtered off and washed with cold water, then freeze-dried to give 5-Bromo-2-ethylpyrimidine-4-carboxylic acid (330 mg, 37%) as a yellow solid. LCMS: 231 [M+1]+, 1H NMR (400 MHz, DMSO-d6): δ 1.25 (t, J=7.6 Hz, 3H), 2.88 (q, J=7.6 Hz, 2H), 9.05 (s, 1H). the heating bath was removed maintained a constant temperature After cooling the mixture was filtered evaporated to a residue which The brown precipitate was filtered off washed with cold water freeze-dried

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a cold (0° C.) solution of NaOEt (0.2 mol) in absolute alcohol (150 mL) was added propionamidine hydrochloride (10.9 g, 0.1 mol) in one portion. A solution of 2-ethoxymethylene-malonic acid diethyl ester (21.6 g, 0.1 mol) in absolute alcohol (60 mL) was added dropwise to the above mixture during 20 minutes. After the addition was completed, the whole mixture was heated to reflux for 2.5 hours, then cooled and poured to ice water. The aqueous solution was acidified to pH 5 with HCl (6 M), extracted with ethyl acetate (4 100 mL). The organic layer was washed with brine and dried over Na2SO4. The solvent was removed under reduced pressure and the residue was re-crystallized with acetonitrile to afford 2-ethyl-6-oxo-1,6-dihydro-pyrimidine-5-carboxylic acid ethyl ester as white crystals (17 g, 86%). 1H NMR(CDCl3) δ 8.71 (s, 1H), 4.37-4.32 (q, 2H), 2.84-2.78 (q, 2H), 1.38-1.34 (m, 6H). MS (ESI) m/e (M+1)+197.2. After the addition the whole mixture was heated to reflux for 2.5 hours cooled extracted with ethyl acetate (4 100 mL) The organic layer was washed with brine dried over Na2SO4 The solvent was removed under reduced pressure the residue was re-crystallized with acetonitrile

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a hot (60° C.) solution of propionamidine hydrochloride prepared in step 2 (54.3 g, 0.5 mol) and propynoic acid ethyl ester (53.9 g, 0.55 mol) in absolute alcohol (1 L) was added dropwise a solution of KOH (70 g, 80%, 1 mol) in absolute alcohol (300 mL) during 3 hours. The temperature was kept between 60° C. and 70° C. during the addition. The solvent was removed in vacuo and the residue was dissolved in water. The aqueous solution was acidified to pH 5 with HCl (6 M), extracted with ethyl acetate for at least 15 times. The organic layer was dried over Na2SO4 and then filtered. The filtrate was evaporated under reduced pressure and the residue was recrystallized with acetonitrile to afford 2-ethyl-3H-pyrimidin-4-one as light yellow crystals (14 g, 23%). The temperature was kept between 60° C. and 70° C. during the addition The solvent was removed in vacuo the residue was dissolved in water extracted with ethyl acetate for at least 15 times The organic layer was dried over Na2SO4 filtered The filtrate was evaporated under reduced pressure the residue was recrystallized with acetonitrile

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Prepared from 4.90 g (45 mmol) propioamidine hydrochloride and 5.00 g (30 mmol) 4-methoxy-benzoic acid hydrazide analogously to the method described for intermediate product 1a). After the ethanol has been distilled off, 10.0 g crude product is obtained that is reacted without any further purification. After the ethanol has been distilled off

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Prepared from 4.90 g (45 mmol) propioamidine hydrochloride and 5.00 g (30 mmol) 4-methoxy-benzoic acid hydrazide analogously to the method described for intermediate product 1a). After the ethanol has been distilled off, 10.0 g crude product is obtained that is reacted without any further purification. After the ethanol has been distilled off

Conditions: temp:80.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a round-bottom flask, which was purged and maintained with an inert atmosphere of nitrogen, was added a solution of 4-(1-(5-(2-bromoacetyl)-4-cyclobutyl-2-methylbenzoyl)piperidin-4-yl)benzonitrile (compound 235.2, 100 mg, 0.210 mmol, 1.00 equiv) in CH3CN (5 mL). Propionimidamide hydrochloride (22.8 mg, 1.00 equiv) and potassium carbonate (86.6 mg, 0.63 mmol, 3.00 equiv) were added to the reaction. The resulting solution was stirred for 3 h at 80° C., then cooled to room temperature and concentrated in vacuo. The residue was dissolved in 20 mL of water. The mixture was extracted with 2×20 mL of ethyl acetate and the combined organic layers were dried over anhydrous sodium sulfate and concentrated in vacuo. The crude product (˜100 mg) was purified by Prep-HPLC with the following conditions (1#-Pre-HPLC-001(SHIMADZU)): Column, SunFire Prep C18, 19*150 mm 5 um; mobile phase, water with 0.05% TFA and CH3CN (29.0% CH3CN up to 43.0% in 7 min, up to 100.0% in 3 min, down to 29.0% in 2 min); Detector, Waters 2489 254&220 nm. The fractions containing pure compound were combined and lyophilized to yield 43 mg (44%) of the title compound as a white solid. m/z (ES+) 453 (M+H)+. 1H NMR (300 MHz, CD3OD): δ 7.68 (d with fine structure, J=7.8 Hz, 2H), 7.56-7.53 (m, 4H), 7.30 and 7.20 (2 singlets, amide rotamers, Ar—H, 1H), ˜4.9 (1H partially obscured by water peak), 3.84-3.70 (m, 1H), 3.70-3.53 (m, 1H), 3.33-3.19 (m, 1H partially obscured by methanol solvent peak), 3.13-2.92 (m, 4H), 2.48 & 2.38 (2 singlets, amide rotamers, Ar—CH3, 3H), 2.29-2.11 (m, 4H), 2.11-1.93 (m, 2H), 1.93-1.72 (m, 3H), 1.72-1.53 (m, 1H), 1.45 (t, 3H). To a round-bottom flask, which was purged maintained with an inert atmosphere of nitrogen cooled to room temperature concentrated in vacuo The residue was dissolved in 20 mL of water The mixture was extracted with 2×20 mL of ethyl acetate the combined organic layers were dried over anhydrous sodium sulfate concentrated in vacuo The crude product (˜100 mg) was purified by Prep-HPLC with the following conditions (1#-Pre-HPLC-001(SHIMADZU)) mobile phase, water with 0.05% TFA and CH3CN (29.0% CH3CN up to 43.0% in 7 min up to 100.0% in 3 min down to 29.0% in 2 min) The fractions containing pure compound

Conditions: temp:80.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a round-bottom flask, which was purged and maintained with an inert atmosphere of nitrogen, was added a solution of 4-(1-(5-(2-bromoacetyl)-4-cyclobutyl-2-methylbenzoyl)piperidin-4-yl)benzonitrile (compound 235.2, 100 mg, 0.210 mmol, 1.00 equiv) in CH3CN (5 mL). Propionimidamide hydrochloride (22.8 mg, 1.00 equiv) and potassium carbonate (86.6 mg, 0.63 mmol, 3.00 equiv) were added to the reaction. The resulting solution was stirred for 3 h at 80° C., then cooled to room temperature and concentrated in vacuo. The residue was dissolved in 20 mL of water. The mixture was extracted with 2×20 mL of ethyl acetate and the combined organic layers were dried over anhydrous sodium sulfate and concentrated in vacuo. The crude product (˜100 mg) was purified by Prep-HPLC with the following conditions (1#-Pre-HPLC-001(SHIMADZU)): Column, SunFire Prep C18, 19*150 mm 5 um; mobile phase, water with 0.05% TFA and CH3CN (29.0% CH3CN up to 43.0% in 7 min, up to 100.0% in 3 min, down to 29.0% in 2 min); Detector, Waters 2489 254&220 nm. The fractions containing pure compound were combined and lyophilized to yield 43 mg (44%) of the title compound as a white solid. m/z (ES+) 453 (M+H)+. 1H NMR (300 MHz, CD3OD): δ 7.68 (d with fine structure, J=7.8 Hz, 2H), 7.56-7.53 (m, 4H), 7.30 and 7.20 (2 singlets, amide rotamers, Ar—H, 1H), ˜4.9 (1H partially obscured by water peak), 3.84-3.70 (m, 1H), 3.70-3.53 (m, 1H), 3.33-3.19 (m, 1H partially obscured by methanol solvent peak), 3.13-2.92 (m, 4H), 2.48 & 2.38 (2 singlets, amide rotamers, Ar—CH3, 3H), 2.29-2.11 (m, 4H), 2.11-1.93 (m, 2H), 1.93-1.72 (m, 3H), 1.72-1.53 (m, 1H), 1.45 (t, 3H). To a round-bottom flask, which was purged maintained with an inert atmosphere of nitrogen cooled to room temperature concentrated in vacuo The residue was dissolved in 20 mL of water The mixture was extracted with 2×20 mL of ethyl acetate the combined organic layers were dried over anhydrous sodium sulfate concentrated in vacuo The crude product (˜100 mg) was purified by Prep-HPLC with the following conditions (1#-Pre-HPLC-001(SHIMADZU)) mobile phase, water with 0.05% TFA and CH3CN (29.0% CH3CN up to 43.0% in 7 min up to 100.0% in 3 min down to 29.0% in 2 min) The fractions containing pure compound

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 8.1 g (0.15 mol) of sodium methoxide was added to a dried single-neck flask equipped with constant pressure dropping funnel and drying pipe. The flask was cooled with ice bath for 10 min. 50 ml of absolute ethanol was added and the mixture was stirred. 10.857 g (0.1 mol) of propanimidamide monohydrochloride was charged into the flask after the sodium methoxide was dissolved, resulting a suspension. Then 16.9 g (0.1 mol) of ethyl cyano(ethoxymethylene)acetate in 70 ml of absolute ethanol was dropped into the flask through the dropping funnel. The reaction turned to yellow from white. The reaction was stirred for 1-2 h after the addition was finished. Ice water was poured into the flask. Precipitate formed was filtered and washed twice with water. 12 g of ethyl 4-amino-2-ethylpyrimidine-5-carboxylate was obtained (yield 62%) after drying. equipped with constant pressure drying pipe The flask was cooled with ice bath for 10 min 50 ml of absolute ethanol was added was dissolved resulting a suspension The reaction was stirred for 1-2 h after the addition Precipitate formed was filtered washed twice with water

Conditions: temp:20.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a cooled, stirred solution of 25% sodium methoxide (1200 ml, 5.55 mole) was added a slurry of 200 g (1.85 mole) of propionamidine hydrochloride in 300 ml of methanol. Next, 244 g (1.85 mole) of dimethyl malonate was added and the mixture was permitted to warm to about 20° C., after which it was stirred for 16 hours. The mixture was evaporated in vacuo and water (about 2 l) was added. This mixture was neutralized with concentrated hydrochloric acid to provide a white precipitate which was separated by filtration to provide 230 g (96%) of 4,6-dihydroxy-2-ethylpyrimidine, m.p. 312°-215° C. The structural assignment was confirmed by infrared and nuclear magnetic resonance spectral analyses. The mixture was evaporated in vacuo and water (about 2 l) was added to provide a white precipitate which was separated by filtration

Conditions: temp:20.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a cooled, stirred solution of 25% sodium methoxide (1200 ml, 5.55 mole) was added a slurry of 200 g (1.85 mole) of propionamidine hydrochloride in 300 ml of methanol. Next, 244 g (1.85 mole) of dimethyl malonate was added and the mixture was permitted to warm to about 20° C., after which it was stirred for 16 hours. The mixture was evaporated in vacuo and water (about 2 l) was added. This mixture was neutralized with concentrated hydrochloric acid to provide a white precipitate which was separated by filtration to provide 230 g (96%) of 4,6-dihydroxy-2-ethylpyrimidine, m.p. 312°-215° C. The structural assignment was confirmed by infrared and nuclear magnetic resonance spectral analyses. The mixture was evaporated in vacuo and water (about 2 l) was added to provide a white precipitate which was separated by filtration

Conditions: temp:55.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Sodium (356 mg, 15.5 mmol) was carefully added to ethanol (5.9 mL) to prepare sodium ethoxide solution in ethanol. The above freshly prepared ethanol solution (3.5 mL) was added to a stirred suspension of propionimidamide hydrochloride (1.05 g, 9.69 mmol). The mixture was warmed to 55° C., then the heating bath was removed and a solution of mucobromic acid (1 g, 3.87 mmol) in ethanol was added dropwise at a rate which maintained a constant temperature, followed by a further sodium ethoxide solution (2 mL). After cooling, the mixture was filtered and evaporated to a residue which was shaken vigorously with hydrochloric acid (2 M×2.4 mL). The brown precipitate was filtered off and washed with cold water, then freeze-dried to give 5-Bromo-2-ethylpyrimidine-4-carboxylic acid (330 mg, 37%) as a yellow solid. LCMS: 231 [M+1]+, 1H NMR (400 MHz, DMSO-d6): δ 1.25 (t, J=7.6 Hz, 3H), 2.88 (q, J=7.6 Hz, 2H), 9.05 (s, 1H). the heating bath was removed maintained a constant temperature After cooling the mixture was filtered evaporated to a residue which The brown precipitate was filtered off washed with cold water freeze-dried

Conditions: temp:55.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Sodium (356 mg, 15.5 mmol) was carefully added to ethanol (5.9 mL) to prepare sodium ethoxide solution in ethanol. The above freshly prepared ethanol solution (3.5 mL) was added to a stirred suspension of propionimidamide hydrochloride (1.05 g, 9.69 mmol). The mixture was warmed to 55° C., then the heating bath was removed and a solution of mucobromic acid (1 g, 3.87 mmol) in ethanol was added dropwise at a rate which maintained a constant temperature, followed by a further sodium ethoxide solution (2 mL). After cooling, the mixture was filtered and evaporated to a residue which was shaken vigorously with hydrochloric acid (2 M×2.4 mL). The brown precipitate was filtered off and washed with cold water, then freeze-dried to give 5-Bromo-2-ethylpyrimidine-4-carboxylic acid (330 mg, 37%) as a yellow solid. LCMS: 231 [M+1]+, 1H NMR (400 MHz, DMSO-d6): δ 1.25 (t, J=7.6 Hz, 3H), 2.88 (q, J=7.6 Hz, 2H), 9.05 (s, 1H). the heating bath was removed maintained a constant temperature After cooling the mixture was filtered evaporated to a residue which The brown precipitate was filtered off washed with cold water freeze-dried