methyl 2-amino-2-methylbutanoate

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

Procedure: A 250 mL flask was charged with methyl 2-amino-2-methylbutanoate (8.4 g, 54.4 mmol), 2,4-dichloropyrimidine (8.9 g, 59.8 mmol), TEA (5.5 g, 54.4 mmol) and 80 mL NMP. The reaction mixture was heated to 80° C. for ˜18 hours. After cooling, water (300 mL) was added and the mixture extracted with MTBE. The organic extracts were washed with water and dried over sodium sulfate. Filtration and evaporation under vacuum afforded 13 g of an orange oil which was purified by flash chromatography, (0-100% ethyl acetate-hexane affording 4.6 g (34%) methyl 2-((2-chloropyrimidin-4-yl)amino)-2-methylbutanoate as an oil. 1H NMR: (CDCl3) δ 8.05-7.88 (m, 1H), 6.28 (δ, 1H), 5.95 (δ, 1H), 4.2-4.0 (g, 1H), 3.86 (m, 1H), 2.46 (m, 1H), 2.10 (m, 1H), 2.01 (m, 1H), 1.72 (m, 3H), 0.89 (m, 3H). m/e, m+1 244.1 After cooling the mixture extracted with MTBE The organic extracts were washed with water dried over sodium sulfate Filtration and evaporation under vacuum

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

Procedure: A 250 mL flask was charged with methyl 2-amino-2-methylbutanoate (8.4 g, 54.4 mmol), 2,4-dichloropyrimidine (8.9 g, 59.8 mmol), TEA (5.5 g, 54.4 mmol) and 80 mL NMP. The reaction mixture was heated to 80° C. for ˜18 hours. After cooling, water (300 mL) was added and the mixture extracted with MTBE. The organic extracts were washed with water and dried over sodium sulfate. Filtration and evaporation under vacuum afforded 13 g of an orange oil which was purified by flash chromatography, (0-100% ethyl acetate-hexane affording 4.6 g (34%) methyl 2-((2-chloropyrimidin-4-yl)amino)-2-methylbutanoate as an oil. 1H NMR: (CDCl3) δ 8.05-7.88 (m, 1H), 6.28 (δ, 1H), 5.95 (δ, 1H), 4.2-4.0 (g, 1H), 3.86 (m, 1H), 2.46 (m, 1H), 2.10 (m, 1H), 2.01 (m, 1H), 1.72 (m, 3H), 0.89 (m, 3H). m/e, m+1 244.1 After cooling the mixture extracted with MTBE The organic extracts were washed with water dried over sodium sulfate Filtration and evaporation under vacuum

Conditions: temp:50.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 2-amino-2-methylbutanoic acid HCl salt (20 g, 130.2 mmol) was suspended in 150 mL methanol. A solution of HCL (4M in dioxane was added and the mixture heated to 50° C. overnight. The mixture was cooled to room temperature and evaporated to dryness under vacuum. The resulting isovaline methyl ester (20 g) was used without further purification. 1H NMR (300 MHz, DMSO) δ 3.78-3.64 (m, 1H), 3.61 (s, 3H), 3.54-3.41 (m, 1H), 2.50 (d, J=1.6 Hz, 1H), 1.76 (s, 2H), 1.66-1.35 (m, 2H), 1.17 (s, 3H), 0.77 (t, J=7.5 Hz, 3H). The mixture was cooled to room temperature evaporated to dryness under vacuum The resulting isovaline methyl ester (20 g) was used without further purification

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

Procedure: A 250 mL flask was charged with methyl 2-amino-2-methylbutanoate (8.4 g, 54.4 mmol), 2,4-dichloropyrimidine (8.9 g, 59.8 mmol), TEA (5.5 g, 54.4 mmol) and 80 mL NMP. The reaction mixture was heated to 80° C. for ˜18 hours. After cooling, water (300 mL) was added and the mixture extracted with MTBE. The organic extracts were washed with water and dried over sodium sulfate. Filtration and evaporation under vacuum afforded 13 g of an orange oil which was purified by flash chromatography, (0-100% ethyl acetate-hexane affording 4.6 g (34%) methyl 2-((2-chloropyrimidin-4-yl)amino)-2-methylbutanoate as an oil. 1H NMR: (CDCl3) δ 8.05-7.88 (m, 1H), 6.28 (δ, 1H), 5.95 (δ, 1H), 4.2-4.0 (μ, 1H), 3.86 (m, 1H), 2.46 (m, 1H), 2.10 (m, 1H), 2.01 (m, 1H), 1.72 (m, 3H), 0.89 (m, 3H). m/e, m+1 244.1 After cooling the mixture extracted with MTBE The organic extracts were washed with water dried over sodium sulfate Filtration and evaporation under vacuum

Conditions: temp:50.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 2-amino-2-methylbutanoic acid HCl salt (20 g, 130.2 mmol) was suspended in 150 mL methanol. A solution of HCL (4M in dioxane was added and the mixture heated to 50° C. overnight. The mixture was cooled to room temperature and evaporated to dryness under vacuum. The resulting isovaline methyl ester (20 g) was used without further purification. 1H NMR (300 MHz, DMSO) δ 3.78-3.64 (m, 1H), 3.61 (s, 3H), 3.54-3.41 (m, 1H), 2.50 (d, J=1.6 Hz, 1H), 1.76 (s, 2H), 1.66-1.35 (m, 2H), 1.17 (s, 3H), 0.77 (t, J=7.5 Hz, 3H). The mixture was cooled to room temperature evaporated to dryness under vacuum The resulting isovaline methyl ester (20 g) was used without further purification

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

Procedure: A 250 mL flask was charged with methyl 2-amino-2-methylbutanoate (8.4 g, 54.4 mmol), 2,4-dichloropyrimidine (8.9 g, 59.8 mmol), TEA (5.5 g, 54.4 mmol) and 80 mL NMP. The reaction mixture was heated to 80° C. for ˜18 hours. After cooling, water (300 mL) was added and the mixture extracted with MTBE. The organic extracts were washed with water and dried over sodium sulfate. Filtration and evaporation under vacuum afforded 13 g of an orange oil which was purified by flash chromatography, (0-100% ethyl acetate-hexane affording 4.6 g (34%) methyl 2-((2-chloropyrimidin-4-yl)amino)-2-methylbutanoate as an oil. 1H NMR: (CDCl3) δ 8.05-7.88 (m, 1H), 6.28 (δ, 1H), 5.95 (δ, 1H), 4.2-4.0 (μ, 1H), 3.86 (m, 1H), 2.46 (m, 1H), 2.10 (m, 1H), 2.01 (m, 1H), 1.72 (m, 3H), 0.89 (m, 3H). m/e, m+1 244.1 After cooling the mixture extracted with MTBE The organic extracts were washed with water dried over sodium sulfate Filtration and evaporation under vacuum

Conditions: temp:50.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 2-amino-2-methylbutanoic acid HCl salt (20 g, 130.2 mmol) was suspended in 150 mL methanol. A solution of HCL (4M in dioxane was added and the mixture heated to 50° C. overnight. The mixture was cooled to room temperature and evaporated to dryness under vacuum. The resulting isovaline methyl ester (20 g) was used without further purification. 1H NMR (300 MHz, DMSO) δ 3.78-3.64 (m, 1H), 3.61 (s, 3H), 3.54-3.41 (m, 1H), 2.50 (d, J=1.6 Hz, 1H), 1.76 (s, 2H), 1.66-1.35 (m, 2H), 1.17 (s, 3H), 0.77 (t, J=7.5 Hz, 3H). The mixture was cooled to room temperature evaporated to dryness under vacuum The resulting isovaline methyl ester (20 g) was used without further purification

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

Procedure: To methyl 2-amino-2-methylbutyrate (2.62 g) was dropped at room temperature 37% formalin (2.27 g), and the mixture was stirred for 4 h. Then the reaction mixture was dissolved in ether and washed with water. The organic phase was dried over magnesium sulfate, filtered and evaporated to get the captioned compound (2.80 g). washed with water The organic phase was dried over magnesium sulfate filtered evaporated

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

Procedure: A 250 mL flask was charged with methyl 2-amino-2-methylbutanoate (8.4 g, 54.4 mmol), 2,4-dichloropyrimidine (8.9 g, 59.8 mmol), TEA(5.5 g, 54.4 mmol) and 80 mL NMP. The reaction mixture was heated to 80° C. for ˜18 hours. After cooling, water (300 mL) was added and the mixture extracted with MTBE. The organic extracts were washed with water and dried over sodium sulfate. Filtration and evaporation under vacuum afforded 13 g of an orange oil which was purified by flash chromatography, (0-100% ethyl acetate-hexane affording 4.6 g (34%) methyl 2-((2-chloropyrimidin-4-yl)amino)-2-methylbutanoate as an oil. 1H NMR: (CDCl3) δ 8.05-7.88 (m, 1H), 6.28 (δ, 1H), 5.95 (δ, 1H), 4.2-4.0 (μ, 1H), 3.86 (m, 1H), 2.46 (m, 1H), 2.10 (m, 1H), 2.01 (m, 1H), 1.72 (m, 3H), 0.89 (m, 3H). m/e, m+1 244.1 After cooling the mixture extracted with MTBE The organic extracts were washed with water dried over sodium sulfate Filtration and evaporation under vacuum

Conditions: temp:50.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 2-amino-2-methylbutanoic acid HCl salt (20 g, 130.2 mmol) was suspended in 150 mL methanol. A solution of HCL (4M in dioxane was added and the mixture heated to 50° C. overnight. The mixture was cooled to room temperature and evaporated to dryness under vacuum. The resulting isovaline methyl ester (20 g) was used without further purification. 1H NMR (300 MHz, DMSO) δ 3.78-3.64 (m, 1H), 3.61 (s, 3H), 3.54-3.41 (m, 1H), 2.50 (d, J=1.6 Hz, 1H), 1.76 (s, 2H), 1.66-1.35 (m, 2H), 1.17 (s, 3H), 0.77 (t, J=7.5 Hz, 3H). The mixture was cooled to room temperature evaporated to dryness under vacuum The resulting isovaline methyl ester (20 g) was used without further purification