benzyl (2S)-6-amino-2-(phenylmethoxycarbonylamino)hexanoate

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The reaction sequence is shown in FIG. 5. Nε -(tert-butoxycarbonyl)-L-lysine (2 g, 8.12 mmol) was dissolved in methanol (40 ml) and water (40 ml), and the pH was adjusted to 8 with triethylamine. A solution of N-(benzyloxycarbonyl-oxy)succinimide in dioxane (2.4 g, 9.7 mmol in 20 ml) was added to the above mixture and the pH was maintained at 8-9 with triethylamine. The reaction mixture was stirred overnight. The solvent was removed by rotary evaporation to obtain crude Nα -CBZ-Nε -(tert-butoxycarbonyl)-L-lysine. Nα -CBZ-Nε -(tert-butoxycarbonyl)-L-lysine was treated with 0.2M calcium carbonate (4 ml) and the aqueous layer was removed to obtain a white solid. The solid was resuspended in N,N-dimethylformamide(40 ml) and benzyl bromide (1.16 ml). The reaction mixture was stirred overnight at room temperature. The reaction mixture was worked up with ethyl acetate and water, and the organic layer was dried over magnesium sulphate. The solvent was removed to obtain crude Nα -CBZ-Nε -(tert-butoxycarbonyl)-L-lysine benzyl ester which was purified by silica gel chromatography using 25% hexane in ethyl acetate as a solvent. To Nα -CBZ-Nε -(tert-butoxycarbonyl)-L-lysine benzyl ester (1 g, 2.2 mmol) in methylene chloride (10 ml) was added trifloroacetic acid at 0° C. The reaction mixture was stirred for 10 minutes at 0° C., then stirred for further 2.5 hr at room temperature. The solvent was removed and the crude product was obtained. Pure Nα -CBZ-L-lysine benzyl ester was obtained by silica gel chromatography. was purified by silica gel chromatography stirred for further 2.5 hr at room temperature The solvent was removed the crude product was obtained

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The reaction sequence is shown in FIG. 5. Nε-(tert-butoxycarbonyl)-L-lysine (2 g, 8.12 mmol) was dissolved in methanol (40 ml) and water (40 ml), and the pH was adjusted to 8 with triethylamine. A solution of N-(benzyloxycarbonyl-oxy)succinimide in dioxane (2.4 g, 9.7 mmol in 20 ml) was added to the above mixture and the pH was maintained at 8-9 with triethylamine. The reaction mixture was stirred overnight. The solvent was removed by rotary evaporation to obtain crude Nα-CBZ-Nε-(tert-butoxycarbonyl)-L-lysine. Nα-CBZ-Nε-(tert-butoxycarbonyl)-L-lysine was treated with 0.2 M calcium carbonate (4 ml) and the aqueous layer was removed to obtain a white solid. The solid was resuspended in N,N-dimethylformamide(40 ml) and benzyl bromide (1.16 ml). The reaction mixture was stirred overnight at room temperature. The reaction mixture was worked up with ethyl acetate and water, and the organic layer was dried over magnesium sulphate. The solvent was removed to obtain crude Nα-CBZ-Nε-(tert-butoxycarbonyl)-L-lysine benzyl ester which was purified by silica gel chromatography using 25% hexane in ethyl acetate as a solvent. To Nα-CBZ-Nε-(tert-butoxycarbonyl)-L-lysine benzyl ester (1 g, 2.2 mmol) in methylene chloride (10 ml) was added trifloroacetic acid at 0° C. The reaction mixture was stirred for 10 minutes at 0° C., then stirred for further 2.5 hr at room temperature. The solvent was removed and the crude product was obtained. Pure Nα-CBZ-L-lysine benzyl ester was obtained by silica gel chromatography. was purified by silica gel chromatography stirred for further 2.5 hr at room temperature The solvent was removed the crude product was obtained

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The reaction sequence is shown in FIG. 5. Nε-(tert-butoxycarbonyl)-L-lysine (2 g, 8.12 mmol) was dissolved in methanol (40 ml) and water (40 ml), and the pH was adjusted to 8 with triethylamine. A solution of N-(benzyloxycarbonyl-oxy)succinimide in dioxane (2.4 g, 9.7 mmol in 20 ml) was added to the above mixture and the pH was maintained at 8-9 with triethylamine. The reaction mixture was stirred overnight. The solvent was removed by rotary evaporation to obtain crude Nα-CBZ-Nε-(tert-butoxycarbonyl)-L-lysine. Nα-CBZ-Nε-(tert-butoxycarbonyl)-L-lysine was treated with 0.2 M calcium carbonate (4 ml) and the aqueous layer was removed to obtain a white solid. The solid was resuspended in N,N-dimethylformamide(40 ml) and benzyl bromide (1.16 ml). The reaction mixture was stirred overnight at room temperature. The reaction mixture was worked up with ethyl acetate and water, and the organic layer was dried over magnesium sulphate. The solvent was removed to obtain crude Nα-CBZ-Nε-(tert-butoxycarbonyl)-L-lysine benzyl ester which was purified by silica gel chromatography using 25% hexane in ethyl acetate as a solvent. To Nα-CBZ-Nε-(tert-butoxycarbonyl)-L-lysine benzyl ester (1 g, 2.2 mmol) in methylene chloride (10 ml) was added trifloroacetic acid at 0° C. The reaction mixture was stirred for 10 minutes at 0° C., then stirred for further 2.5 hr at room temperature. The solvent was removed and the crude product was obtained. Pure Nα-CBZ-L-lysine benzyl ester was obtained by silica gel chromatography. was purified by silica gel chromatography stirred for further 2.5 hr at room temperature The solvent was removed the crude product was obtained

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The reaction sequence is shown in FIG. 5. Nε -(tert-butoxycarbonyl)-L-lysine (2 g, 8.12 mmol) was dissolved in methanol (40 ml) and water (40 ml), and the pH was adjusted to 8 with triethylamine. A solution of N-(benzyloxycarbonyl-oxy)succinimide in dioxane (2.4 g, 9.7 mmol in 20 ml) was added to the above mixture and the pH was maintained at 8-9 with triethylamine. The reaction mixture was stirred overnight. The solvent was removed by rotary evaporation to obtain crude Nα -CBZ-Nε -(tert-butoxycarbonyl)-L-lysine. Nα -CBZ-Nε -(tert-butoxycarbonyl)-L-lysine was treated with 0.2M calcium carbonate (4 ml) and the aqueous layer was removed to obtain a white solid. The solid was resuspended in N,N-dimethylformamide(40 ml) and benzyl bromide (1.16 ml). The reaction mixture was stirred overnight at room temperature. The reaction mixture was worked up with ethyl acetate and water, and the organic layer was dried over magnesium sulphate. The solvent was removed to obtain crude Nα -CBZ-Nε -(tert-butoxycarbonyl)-L-lysine benzyl ester which was purified by silica gel chromatography using 25% hexane in ethyl acetate as a solvent. To Nα -CBZ-Nε -(tert-butoxycarbonyl)-L-lysine benzyl ester (1 g, 2.2 mmol) in methylene chloride (10 ml) was added trifloroacetic acid at 0° C. The reaction mixture was stirred for 10 minutes at 0° C., then stirred for further 2.5 hr at room temperature. The solvent was removed and the crude product was obtained. Pure Nα -CBZ-L-lysine benzyl ester was obtained by silica gel chromatography. was purified by silica gel chromatography stirred for further 2.5 hr at room temperature The solvent was removed the crude product was obtained

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The reaction sequence is shown in FIG. 5. Nε-(tert-butoxycarbonyl)-L-lysine (2 g, 8.12 mmol) was dissolved in methanol (40 ml) and water (40 ml), and the pH was adjusted to 8 with triethylamine. A solution of N-(benzyloxycarbonyl-oxy)succinimide in dioxane (2.4 g, 9.7 mmol in 20 ml) was added to the above mixture and the pH was maintained at 8-9 with triethylamine. The reaction mixture was stirred overnight. The solvent was removed by rotary evaporation to obtain crude Nα-CBZ-Nε-(tert-butoxycarbonyl)-L-lysine. Nα-CBZ-Nε-(tert-butoxycarbonyl)-L-lysine was treated with 0.2 M calcium carbonate (4 ml) and the aqueous layer was removed to obtain a white solid. The solid was resuspended in N,N-dimethylformamide(40 ml) and benzyl bromide (1.16 ml). The reaction mixture was stirred overnight at room temperature. The reaction mixture was worked up with ethyl acetate and water, and the organic layer was dried over magnesium sulphate. The solvent was removed to obtain crude Nα-CBZ-Nε-(tert-butoxycarbonyl)-L-lysine benzyl ester which was purified by silica gel chromatography using 25% hexane in ethyl acetate as a solvent. To Nα-CBZ-Nε-(tert-butoxycarbonyl)-L-lysine benzyl ester (1 g, 2.2 mmol) in methylene chloride (10 ml) was added trifloroacetic acid at 0° C. The reaction mixture was stirred for 10 minutes at 0° C., then stirred for further 2.5 hr at room temperature. The solvent was removed and the crude product was obtained. Pure Nα-CBZ-L-lysine benzyl ester was obtained by silica gel chromatography. was purified by silica gel chromatography stirred for further 2.5 hr at room temperature The solvent was removed the crude product was obtained

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The reaction sequence is shown in FIG. 5. Nε-(tert-butoxycarbonyl)-L-lysine (2 g, 8.12 mmol) was dissolved in methanol (40 ml) and water (40 ml), and the pH was adjusted to 8 with triethylamine. A solution of N-(benzyloxycarbonyl-oxy)succinimide in dioxane (2.4 g, 9.7 mmol in 20 ml) was added to the above mixture and the pH was maintained at 8-9 with triethylamine. The reaction mixture was stirred overnight. The solvent was removed by rotary evaporation to obtain crude Nα-CBZ-Nε-(tert-butoxycarbonyl)-L-lysine. Nα-CBZ-Nε-(tert-butoxycarbonyl)-L-lysine was treated with 0.2 M calcium carbonate (4 ml) and the aqueous layer was removed to obtain a white solid. The solid was resuspended in N,N-dimethylformamide(40 ml) and benzyl bromide (1.16 ml). The reaction mixture was stirred overnight at room temperature. The reaction mixture was worked up with ethyl acetate and water, and the organic layer was dried over magnesium sulphate. The solvent was removed to obtain crude Nα-CBZ-Nε-(tert-butoxycarbonyl)-L-lysine benzyl ester which was purified by silica gel chromatography using 25% hexane in ethyl acetate as a solvent. To Nα-CBZ-Nε-(tert-butoxycarbonyl)-L-lysine benzyl ester (1 g, 2.2 mmol) in methylene chloride (10 ml) was added trifloroacetic acid at 0° C. The reaction mixture was stirred for 10 minutes at 0° C., then stirred for further 2.5 hr at room temperature. The solvent was removed and the crude product was obtained. Pure Nα-CBZ-L-lysine benzyl ester was obtained by silica gel chromatography. was purified by silica gel chromatography stirred for further 2.5 hr at room temperature The solvent was removed the crude product was obtained

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

Procedure: To Nα-CBZ-L-lysine benzyl ester fibrils (113 mg) in methanol (4 ml) was added sodium hydroxide (1 N, 4 ml) and the reaction mixture was stirred overnight. The product Nα-CBZ-L-lysine fibrils was extensively washed with water and methanol and the fibrils were dried under vacuum. To a suspension of Nα-CBZ-L-lysine fibrils (50 mg) in acetonitrile (4 ml) was added trimethyl silyl iodide (1 ml). The mixture was stirred for 3 hours at 40° C. The final bifunctional fibrils were extensively washed with water, methanol, 0.5 N sodium hydroxide, acetonitrile and methylene chloride. Amino acid analysis showed 0.3 μmols lysine per gram of fibrils. The product Nα-CBZ-L-lysine fibrils was extensively washed with water and methanol the fibrils were dried under vacuum To a suspension of Nα-CBZ-L-lysine fibrils (50 mg) in acetonitrile (4 ml) was added trimethyl silyl iodide (1 ml) The mixture was stirred for 3 hours at 40° C The final bifunctional fibrils were extensively washed with water, methanol, 0.5 N sodium hydroxide, acetonitrile and methylene chloride

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The reaction sequence is shown in FIG. 5. Nε-(tert-butoxycarbonyl)-L-lysine (2 g, 8.12 mmol) was dissolved in methanol (40 ml) and water (40 ml), and the pH was adjusted to 8 with triethylamine. A solution of N-(benzyloxycarbonyl-oxy)succinimide in dioxane (2.4 g, 9.7 mmol in 20 ml) was added to the above mixture and the pH was maintained at 8–9 with triethylamine. The reaction mixture was stirred overnight. The solvent was removed by rotary evaporation to obtain crude Nα-CBZ-Nε-(tert-butoxycarbonyl)-L-lysine. Nα-CBZ-Nε-(tert-butoxycarbonyl)-L-lysine was treated with 0.2 M calcium carbonate (4 ml) and the aqueous layer was removed to obtain a white solid. The solid was resuspended in N,N-dimethylformamide(40 ml) and benzyl bromide (1.16 ml). The reaction mixture was stirred overnight at room temperature. The reaction mixture was worked up with ethyl acetate and water, and the organic layer was dried over magnesium sulphate. The solvent was removed to obtain crude Nα-CBZ-Nε-(tert-butoxycarbonyl)-L-lysine benzyl ester which was purified by silica gel chromatography using 25% hexane in ethyl acetate as a solvent. To Nα-CBZ-Nε-(tert-butoxycarbonyl)-L-lysine benzyl ester (1 g, 2.2 mmol) in methylene chloride (10 ml) was added trifloroacetic acid at 0° C. The reaction mixture was stirred for 10 minutes at 0° C., then stirred for further 2.5 hr at room temperature. The solvent was removed and the crude product was obtained. Pure Nα-CBZ-L-lysine benzyl ester was obtained by silica gel chromatography. was purified by silica gel chromatography stirred for further 2.5 hr at room temperature The solvent was removed the crude product was obtained

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The reaction sequence is shown in FIG. 5. Nε -(tert-butoxycarbonyl)-L-lysine (2 g, 8.12 mmol) was dissolved in methanol (40 ml) and water (40 ml), and the pH was adjusted to 8 with triethylamine. A solution of N-(benzyloxycarbonyl-oxy)succinimide in dioxane (2.4 g, 9.7 mmol in 20 ml) was added to the above mixture and the pH was maintained at 8-9 with triethylamine. The reaction mixture was stirred overnight. The solvent was removed by rotary evaporation to obtain crude Nα -CBZ-Nε -(tert-butoxycarbonyl)-L-lysine. Nα -CBZ-Nε -(tert-butoxycarbonyl)-L-lysine was treated with 0.2M calcium carbonate (4 ml) and the aqueous layer was removed to obtain a white solid. The solid was resuspended in N,N-dimethylformamide(40 ml) and benzyl bromide (1.16 ml). The reaction mixture was stirred overnight at room temperature. The reaction mixture was worked up with ethyl acetate and water, and the organic layer was dried over magnesium sulphate. The solvent was removed to obtain crude Nα -CBZ-Nε -(tert-butoxycarbonyl)-L-lysine benzyl ester which was purified by silica gel chromatography using 25% hexane in ethyl acetate as a solvent. To Nα -CBZ-Nε -(tert-butoxycarbonyl)-L-lysine benzyl ester (1 g, 2.2 mmol) in methylene chloride (10 ml) was added trifloroacetic acid at 0° C. The reaction mixture was stirred for 10 minutes at 0° C., then stirred for further 2.5 hr at room temperature. The solvent was removed and the crude product was obtained. Pure Nα -CBZ-L-lysine benzyl ester was obtained by silica gel chromatography. was purified by silica gel chromatography stirred for further 2.5 hr at room temperature The solvent was removed the crude product was obtained

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: The reaction sequence is shown in FIG. 5. Nε-(tert-butoxycarbonyl)-L-lysine (2 g, 8.12 mmol) was dissolved in methanol (40 ml) and water (40 ml), and the pH was adjusted to 8 with triethylamine. A solution of N-(benzyloxycarbonyl-oxy)succinimide in dioxane (2.4 g, 9.7 mmol in 20 ml) was added to the above mixture and the pH was maintained at 8-9 with triethylamine. The reaction mixture was stirred overnight. The solvent was removed by rotary evaporation to obtain crude Nα-CBZ-Nε-(tert-butoxycarbonyl)-L-lysine. Nα-CBZ-Nε-(tert-butoxycarbonyl)-L-lysine was treated with 0.2 M calcium carbonate (4 ml) and the aqueous layer was removed to obtain a white solid. The solid was resuspended in N,N-dimethylformamide(40 ml) and benzyl bromide (1.16 ml). The reaction mixture was stirred overnight at room temperature. The reaction mixture was worked up with ethyl acetate and water, and the organic layer was dried over magnesium sulphate. The solvent was removed to obtain crude Nα-CBZ-Nε-(tert-butoxycarbonyl)-L-lysine benzyl ester which was purified by silica gel chromatography using 25% hexane in ethyl acetate as a solvent. To Nα-CBZ-Nε-(tert-butoxycarbonyl)-L-lysine benzyl ester (1 g, 2.2 mmol) in methylene chloride (10 ml) was added trifloroacetic acid at 0° C. The reaction mixture was stirred for 10 minutes at 0° C., then stirred for further 2.5 hr at room temperature. The solvent was removed and the crude product was obtained. Pure Nα-CBZ-L-lysine benzyl ester was obtained by silica gel chromatography. was purified by silica gel chromatography stirred for further 2.5 hr at room temperature The solvent was removed the crude product was obtained