methyl 3-amino-2,2-dimethylpropanoate

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:150.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 1-benzyl-8-cyano-5-hydroxy-2-oxo-3-phenyl-1,2-dihydro-[1,7]naphthyridine-6-carboxylic acid methyl ester (52 mg, 0.127 mmol) and 3-amino-2,2-dimethyl-propionic acid methyl ester (83 mg, 0.633 mmol) in MeOH (3 mL) was heated to 150° C. for 1 h in a CEM microwave reactor. The solvent was evaporated in vacuo and the residue was chromatographed (0-40% EtOAc/hexanes) to give 63 mg of the title compound as a yellow oil. MS: (+) m/z 511.22 (M+1). The solvent was evaporated in vacuo the residue was chromatographed (0-40% EtOAc/hexanes)

Conditions: temp:150.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 1-benzyl-8-cyano-5-hydroxy-2-oxo-3-phenyl-1,2-dihydro-[1,7]naphthyridine-6-carboxylic acid methyl ester (52 mg, 0.127 mmol) and 3-amino-2,2-dimethyl-propionic acid methyl ester (83 mg, 0.633 mmol) in MeOH (3 mL) was heated to 150° C. for 1 h in a CEM microwave reactor. The solvent was evaporated in vacuo and the residue was chromatographed (0-40% EtOAc/hexanes) to give 63 mg of the title compound as a yellow oil. MS: (+) m/z 511.22 (M+1). The solvent was evaporated in vacuo the residue was chromatographed (0-40% EtOAc/hexanes)

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

Procedure: A solution of 1-[(55)-1-oxaspiro[2.5]oct-5-ylmethyl]-1H-benzimidazole-6-carbonitrile (1.064 g, 3.98 mmol) and methyl 3-amino-2,2-dimethylpropanoate (0.679 g, 5.17 mmol) in isopropanol (13.27 mL) was stirred at 100° C. for 1 day. Reaction was concentrated and purified via silica gel chromatography (ISCO, 120 g silica gel column. Solvent A was DCM and solvent B was 0.1M NH3 in MeOH; 0-10% B over 15 min; 10% B over 6 min) to give methyl 3-[({3-[(6-cyano-1H-benzimidazol-1-yl)methyl]-1-hydroxycyclohexaneyl}methyl)amino]-2,2-dimethylpropanoate as a sticky solid (1.05 g, 66.1% yield). MS (m/z) 399.2 (M+H+). Reaction was concentrated purified via silica gel chromatography (ISCO, 120 g silica gel column. Solvent A was DCM and solvent B was 0.1M NH3 in MeOH; 0-10% B over 15 min; 10% B over 6 min)

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

Procedure: A solution of 1-[(55)-1-oxaspiro[2.5]oct-5-ylmethyl]-1H-benzimidazole-6-carbonitrile (1.064 g, 3.98 mmol) and methyl 3-amino-2,2-dimethylpropanoate (0.679 g, 5.17 mmol) in isopropanol (13.27 mL) was stirred at 100° C. for 1 day. Reaction was concentrated and purified via silica gel chromatography (ISCO, 120 g silica gel column. Solvent A was DCM and solvent B was 0.1M NH3 in MeOH; 0-10% B over 15 min; 10% B over 6 min) to give methyl 3-[({3-[(6-cyano-1H-benzimidazol-1-yl)methyl]-1-hydroxycyclohexaneyl}methyl)amino]-2,2-dimethylpropanoate as a sticky solid (1.05 g, 66.1% yield). MS (m/z) 399.2 (M+H+). Reaction was concentrated purified via silica gel chromatography (ISCO, 120 g silica gel column. Solvent A was DCM and solvent B was 0.1M NH3 in MeOH; 0-10% B over 15 min; 10% B over 6 min)

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

Procedure: A mixture of methyl 3-amino-2,2-dimethylpropanoate (1.0 g, 7.63 mmol) and acrylonitrile (2 eq., 1 mL, 15.26 mmol) in methanol (50 mL) was stirred at room temperature for about 18 hours. After evaporation of the solvent, the residue was purified by flash chromatography on silica gel, using cyclohexane-ethyl acetate 1:1 as eluant, to give the title compound as colourless oil (0.7 g, 70% yield). After evaporation of the solvent the residue was purified by flash chromatography on silica gel

Conditions: temp:65.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Hydrazine (1.1 eq., 0.27 mL, 8.42 mmol) was added to the solution of methyl 3-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)-2,2-dimethylpropanoate (0.2 g, 7.66 mmol) in methanol (60 mL) maintained under magnetic stirring at 65° C. After 5 hours the reaction mixture was allowed to cool to room temperature, diluted with diethyl ether and filtered. The filtrate was washed thoroughly with diethyl ether. The title compound was obtained after evaporation of the solvents and it was used in the next step without any further purification. (0.8 g, 75% yield). maintained to cool to room temperature filtered The filtrate was washed thoroughly with diethyl ether

Conditions: temp:65.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Hydrazine (1.1 eq., 0.27 mL, 8.42 mmol) was added to the solution of methyl 3-(1,3-dioxo-1,3-dihydro-2H-isoindol-2-yl)-2,2-dimethylpropanoate (0.2 g, 7.66 mmol) in methanol (60 mL) maintained under magnetic stirring at 65° C. After 5 hours the reaction mixture was allowed to cool to room temperature, diluted with diethyl ether and filtered. The filtrate was washed thoroughly with diethyl ether. The title compound was obtained after evaporation of the solvents and it was used in the next step without any further purification. (0.8 g, 75% yield). maintained to cool to room temperature filtered The filtrate was washed thoroughly with diethyl ether

Conditions: temp:0.00; pressure:0.00; stir:

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

Procedure: 1-aminomethyl-cyclopropanecarboxylic acid methyl ester was prepared by hydrogenation of 1-cyano-cyclopropanecarboxylic acid ethyl ester, by the method similar to the preparation of 3-amino-2,2-dimethyl-propanoic acid methyl ester, above.

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

Procedure: A mixture of 10 g of Raney-nickel 2800 was transferred to a 500 mL hydrogenation vessel and washed three times with 40 mL of methanol. Then, 180 mL of methanol and 25.0 g (0.177 mole) of 2-cyano-2-methylpropanoic acid ethyl ester was added and the mixture agitated on a Paar hydrogenator under a 50 psi atmosphere of hydrogen for 24 hours. The mixture was filtered through Celite, washing the filter pad with methanol, and then concentrated under reduced pressure to give 21.98 g of 3-amino-2,2-dimethyl-propanoic acid methyl ester, which was used without further purification. was transferred to a 500 mL hydrogenation vessel washed three times with 40 mL of methanol The mixture was filtered through Celite washing the filter pad with methanol concentrated under reduced pressure

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

Procedure: To a solution of 21.98 g (0.167 mole) of 3-amino-2,2-dimethyl-propanoic acid methyl ester (from method 6) in 500 mL of dichloromethane cooled to 0 degrees, was added 14.1 g (0.167 mole) of cyclopentanone, 16.0 g (0.181 mole) of sodium acetate and 52.0 g (0.025 mole) of sodium triacetoxyborohydride. The mixture stirred at room temp. for 22 hours, and then quenched by the addition of 500 mL of saturated sodium bicarbonate solution. The mixture was stirred for 1 hour and then extracted twice 400 mL of dichloromethane. The combined organic layers were dried over anhydrous sodium sulfate, filtered and concentrated under reduced pressure to give 31.8 g of 3-cyclopentylamino-2,2-dimethyl-propanoic acid methyl ester which was used without further purification. quenched by the addition of 500 mL of saturated sodium bicarbonate solution The mixture was stirred for 1 hour extracted twice 400 mL of dichloromethane The combined organic layers were dried over anhydrous sodium sulfate filtered concentrated under reduced pressure