(2S)-2-amino-3-phenylpropanamide;hydrochloride

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

Procedure: To a solution of L-phenylalaninamide hydrochloride (20 g, 0.1 mol) in water (200 ml), adjusted to pH 8.2 with 10% sodium hydroxide (about 35 ml), was added isobutyl 4-oxobutanoate (16 g, 0.1 mol). The solution was refluxed for 24 hours After cooling, the solution was extracted with dichloromethane (4×200 ml). The organic phase was dried and evaporated to dryness under vacuum. The residue was chromatographed over silica gel (dichloromethanemethanol 9:1) to afford 6 g (20%) of the title compound, as an oil, which was characterized as the hydrochloride, m.p. 152°-155° C. (with decomposition) (after crystallization from ethanol-diethyl ether). NMR (DMSO-d6, CDCl13): deltaH =9.25 (b.s., 1H, CONH); 7.6-7.1 (c.a., 5H, PhH), 4.90 (t, J=6.1 Hz, 1H, NHCHNH); 4.17 (t, J=6.1 Hz, 1H, CHCH2Ph); 3.84 (d, J=6.9 Hz, 2H, COOCH2CH); 3.35 (c.a., 2H, CH2Ph); 2.50-1.60 (c.a., 5H, CH2CH2COO, CH2CH(CH3)2. MS (E.I., 70 eV, 1.5 mA) m/z=304 (M+), 213 (M--C7H7)+, 84 (C3H4N2O)+. The solution was refluxed for 24 hours After cooling the solution was extracted with dichloromethane (4×200 ml) The organic phase was dried evaporated to dryness under vacuum The residue was chromatographed over silica gel (dichloromethanemethanol 9:1)

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

Procedure: A methanol (30 ml) solution of cyclohexane-1,2-dione (13.44 g, 0.12M) was added to phenylalanineamide hydrochloride (20.05 g, 0.1M) dissolved in methanol (200 ml) with cooling below -30° C., and aqueous 12.5N-NaOH (20 ml) was added dropwise thereto. The reaction mixture was stirred at below -30° C. for 30 minutes and was further stirred at room temperature for 3 hours. Conc. hydrochloric acid (25 ml) was added to the reaction mixture, and sodium bicarbonate (15 g) was added after 10 minutes stirring, the solvent then being distilled off in vacuo. The residue, to which was added water, was extracted three times with chloroform, and the extract was dried with anhydrous magnesium sulfate and concentrated in vacuo. The residue was recrystallized from acetone to obtain the product. (19.7 g, yield: 82.1%). with cooling below -30° C. was further stirred at room temperature for 3 hours was added after 10 minutes stirring the solvent then being distilled off in vacuo The residue, to which was added water was extracted three times with chloroform the extract was dried with anhydrous magnesium sulfate concentrated in vacuo The residue was recrystallized from acetone to obtain the product

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

Procedure: To a solution of trans-4-(t-butoxycarbonylaminomethyl)cyclohexyl carboxylic acid (3.86 g) dissolved in dry tetrahydrofuran (150.00 ml), triethylamine (2.25 ml) was added under ice-cooling and the mixture was stirred for 5 minutes. A solution of ethyl chlorocarbonate (1.63 g) in dry tetrahydrofuran (10.00 ml) was added to the mixture under ice-cooling, and the mixture was stirred at the same temperature for 20 minutes. L-phenylalanine amide hydrochloride and triethylamine (2.25 ml) were added to the mixture, and the mixture was stirred under ice-cooling for 2 hours and under room temperature for one hour, followed by concentration under a reduced pressure. Water was added to the residue, and the insolubles therein were filtered, thoroughly washed with water, and further washed with 50% aqueous ethyl alcohol and 50% ethyl alcohol-ethyl ether, followed by drying, to give N-[trans-4-(t-butoxycarbonylaminomethyl)cyclohexylcarbonyl]-L-phenylalanine amide (I) (4.82 g) as a white powder. This structure was confirmed by NMR spectrum. cooling cooling the mixture was stirred at the same temperature for 20 minutes the mixture was stirred under ice- followed by concentration under a reduced pressure Water was added to the residue the insolubles therein were filtered thoroughly washed with water further washed with 50% aqueous ethyl alcohol and 50% ethyl alcohol-ethyl ether by drying

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

Procedure: Two minutes later, a solution of PheNH2HCl (1.2 g, 0.6 mmol), obtained by cleavage of the t-butoxycarbonyl group from BocPheNH2 with 4.5N HCl in EtOAc, and NMM (0.6 g, 6 mmoles) in DMF is added thereto.

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

Procedure: To 100 ml. of anhydrous ethyl alcohol were added 8 grams (0.04 mole) of L-phenylalanine amide hydrochloride. To the mixture then were added 13.4 grams (0.16 mole) of solid anhydrous sodium bicarbonate and 6.44 grams (0.048 mole) of bromomethylcyclopropane. The mixture was refluxed for seven hours and then was evaporated in vacuo to an oil. The oil was dissolved in ethyl acetate, and the ethyl acetate solution was extracted with water. The organic phase was dried over magnesium sulfate and evaporated in vacuo to an oil. The oil was applied to a 3×50 cm. column of Grace and Davison grade 62 silica gel in chloroform. The product was eluted with a gradient of chloroform containing up to 5 percent methanol. The product was isolated according to the thin-layer profile of the fractions collected to give 3.41 grams (39 percent) of the title compound. The mixture was refluxed for seven hours was evaporated in vacuo to an oil The oil was dissolved in ethyl acetate the ethyl acetate solution was extracted with water The organic phase was dried over magnesium sulfate evaporated in vacuo to an oil The product was eluted with a gradient of chloroform containing up to 5 percent methanol The product was isolated collected

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

Procedure: To 100 ml. of anhydrous ethyl alcohol were added 8 grams (0.04 mole) of L-phenylalanine amide hydrochloride. To the mixture then were added 13.4 grams (0.16 mole) of solid anhydrous sodium bicarbonate and 6.44 grams (0.048 mole) of bromomethylcyclopropane. The mixture was refluxed for seven hours and then was evaporated in vacuo to an oil. The oil was dissolved in ethyl acetate, and the ethyl acetate solution was extracted with water. The organic phase was dried over magnesium sulfate and evaporated in vacuo to an oil. The oil was applied to a 3×50 cm. column of Grace and Davison grade 62 silica gel in chloroform. The product was eluted with a gradient of chloroform containing up to 5 percent methanol. The product was isolated according to the thin-layer profile of the fractions collected to give 3.41 grams (39 percent) of the title compound. The mixture was refluxed for seven hours was evaporated in vacuo to an oil The oil was dissolved in ethyl acetate the ethyl acetate solution was extracted with water The organic phase was dried over magnesium sulfate evaporated in vacuo to an oil The product was eluted with a gradient of chloroform containing up to 5 percent methanol The product was isolated collected

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

Procedure: First, the amine compound N-methyl-L-valyl-N-[(3R,4S,5S)-1-{(2S)-2-[(1R,2R)-3-{[(2S)-1-tert.-butoxy-1-oxo-3-phenylpropan-2-yl]amino}-1-methoxy-2-methyl-3-oxopropyl]pyrrolidin-1-yl}-3-methoxy-5-methyl-1-oxoheptan-4-yl]-N-methyl-L-valinamide was produced as sodium trifluoroacetate, analogous to the synthesis described in example 10, by means of coupling N-(tert.-butoxycarbonyl)-N-methyl-L-valyl-N-[(3R,4S,5S)-1-{(2S)-2-[(1R,2R)-2-carboxy-1-methoxypropyl]pyrrolidin-1-yl}-3-methoxy-5-methyl-1-oxoheptan-4-yl]-N-methyl-L-valinamide (intermediate 15) with L-phenylalaninamide-hydrochloride in the presence of O-(7-Azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium-hexafluorophosphate, followed by cleavage of the Boc protected group with the help of trifluoroacetic acid. Out of 47 mg (0.049 mmol) of this compound 39 mg (96% o. th.) of the title compound were obtained in analogy to the production of example 6, treated with 4-ketobutyric acid in the presence of sodium cyanoborohydride.

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

Procedure: To a solution of L-phenylalaninamide hydrochloride (20 g, 0.1 mol) in water (200 ml), adjusted to pH 8.2 with 10% sodium hydroxide (about 35 ml), was added isobutyl 4-oxobutanoate (16 g, 0.1 mol). The solution was refluxed for 24 hours. After cooling, the solution was extracted with dichloromethane (4×200 ml). The organic phase was dried and evaporated to dryness under vacuum. The residue was chromatographed over silica gel (dichloromethanemethanol 9:1) to afford 6 g (20%) of the title compound, as an oil, which was characterized as the hydrochloride, m.p. 152°-155° C. (with decomposition) (after crystallization from ethanol-diethyl ether). NMR (DMSO-d6, CDCl3): deltaH =9.25 (b.s., 1H, CONH); 7.6-7.1 (c.a., 5H, PhH), 4.90 (t, J=6.1 Hz, 1H, NHCHNH); 4.17 (t, J=6.1 Hz, 1H, CHCH2Ph); 3.84 (d, J=6.9 Hz, 2H, COOCH2CH); 3.35 (c.a., 2H, CH2Ph); 2.50-1.60 (c.a., 5H, CH2CH2COO, CH2CH(CH3)2. MS (E.I., 70 eV, 1.5 mA) m/z=304 (M+), 213 (M--C7H 7 +, 84 (C3H4N20)+. The solution was refluxed for 24 hours After cooling the solution was extracted with dichloromethane (4×200 ml) The organic phase was dried evaporated to dryness under vacuum The residue was chromatographed over silica gel (dichloromethanemethanol 9:1)

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

Procedure: To a solution of L-phenylalaninamide hydrochloride (20 g, 0.1 mol) in water (200 ml), adjusted to pH 8.2 with 10% sodium hydroxide (about 35 ml), was added isobutyl 4-oxobutanoate (16 g, 0.1 mol). The solution was refluxed for 24 hours After cooling, the solution was extracted with dichloromethane (4×200 ml). The organic phase was dried and evaporated to dryness under vacuum. The residue was chromatographed over silica gel (dichloromethanemethanol 9:1) to afford 6 g (20%) of the title compound, as an oil, which was characterized as the hydrochloride, m.p. 152°-155° C. (with decomposition) (after crystallization from ethanol-diethyl ether). NMR (DMSO-d6, CDCl13): deltaH =9.25 (b.s., 1H, CONH); 7.6-7.1 (c.a., 5H, PhH), 4.90 (t, J=6.1 Hz, 1H, NHCHNH); 4.17 (t, J=6.1 Hz, 1H, CHCH2Ph); 3.84 (d, J=6.9 Hz, 2H, COOCH2CH); 3.35 (c.a., 2H, CH2Ph); 2.50-1.60 (c.a., 5H, CH2CH2COO, CH2CH(CH3)2. MS (E.I., 70 eV, 1.5 mA) m/z=304 (M+), 213 (M--C7H7)+, 84 (C3H4N2O)+. The solution was refluxed for 24 hours After cooling the solution was extracted with dichloromethane (4×200 ml) The organic phase was dried evaporated to dryness under vacuum The residue was chromatographed over silica gel (dichloromethanemethanol 9:1)

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

Procedure: To a solution of L-phenylalaninamide hydrochloride (20 g, 0.1 mol) in water (200 ml), adjusted to pH 8.2 with 10% sodium hydroxide (about 35 ml), was added isobutyl 4-oxobutanoate (16 g, 0.1 mol). The solution was refluxed for 24 hours After cooling, the solution was extracted with dichloromethane (4×200 ml). The organic phase was dried and evaporated to dryness under vacuum. The residue was chromatographed over silica gel (dichloromethanemethanol 9:1) to afford 6 g (20%) of the title compound, as an oil, which was characterized as the hydrochloride, m.p. 152°-155° C. (with decomposition) (after crystallization from ethanol-diethyl ether). NMR (DMSO-d6, CDCl13): deltaH =9.25 (b.s., 1H, CONH); 7.6-7.1 (c.a., 5H, PhH), 4.90 (t, J=6.1 Hz, 1H, NHCHNH); 4.17 (t, J=6.1 Hz, 1H, CHCH2Ph); 3.84 (d, J=6.9 Hz, 2H, COOCH2CH); 3.35 (c.a., 2H, CH2Ph); 2.50-1.60 (c.a., 5H, CH2CH2COO, CH2CH(CH3)2. MS (E.I., 70 eV, 1.5 mA) m/z=304 (M+), 213 (M--C7H7)+, 84 (C3H4N2O)+. The solution was refluxed for 24 hours After cooling the solution was extracted with dichloromethane (4×200 ml) The organic phase was dried evaporated to dryness under vacuum The residue was chromatographed over silica gel (dichloromethanemethanol 9:1)

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

Procedure: A methanol (30 ml) solution of cyclohexane-1,2-dione (13.44 g, 0.12M) was added to phenylalanineamide hydrochloride (20.05 g, 0.1M) dissolved in methanol (200 ml) with cooling below -30° C., and aqueous 12.5N-NaOH (20 ml) was added dropwise thereto. The reaction mixture was stirred at below -30° C. for 30 minutes and was further stirred at room temperature for 3 hours. Conc. hydrochloric acid (25 ml) was added to the reaction mixture, and sodium bicarbonate (15 g) was added after 10 minutes stirring, the solvent then being distilled off in vacuo. The residue, to which was added water, was extracted three times with chloroform, and the extract was dried with anhydrous magnesium sulfate and concentrated in vacuo. The residue was recrystallized from acetone to obtain the product. (19.7 g, yield: 82.1%). with cooling below -30° C. was further stirred at room temperature for 3 hours was added after 10 minutes stirring the solvent then being distilled off in vacuo The residue, to which was added water was extracted three times with chloroform the extract was dried with anhydrous magnesium sulfate concentrated in vacuo The residue was recrystallized from acetone to obtain the product

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

Procedure: A methanol (30 ml) solution of cyclohexane-1,2-dione (13.44 g, 0.12M) was added to phenylalanineamide hydrochloride (20.05 g, 0.1M) dissolved in methanol (200 ml) with cooling below -30° C., and aqueous 12.5N-NaOH (20 ml) was added dropwise thereto. The reaction mixture was stirred at below -30° C. for 30 minutes and was further stirred at room temperature for 3 hours. Conc. hydrochloric acid (25 ml) was added to the reaction mixture, and sodium bicarbonate (15 g) was added after 10 minutes stirring, the solvent then being distilled off in vacuo. The residue, to which was added water, was extracted three times with chloroform, and the extract was dried with anhydrous magnesium sulfate and concentrated in vacuo. The residue was recrystallized from acetone to obtain the product. (19.7 g, yield: 82.1%). with cooling below -30° C. was further stirred at room temperature for 3 hours was added after 10 minutes stirring the solvent then being distilled off in vacuo The residue, to which was added water was extracted three times with chloroform the extract was dried with anhydrous magnesium sulfate concentrated in vacuo The residue was recrystallized from acetone to obtain the product