(2R)-2-amino-3-methyl-1-pyrrolidin-1-ylbutan-1-one

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

Procedure: A mixture of sodium triacetoxyborohydride (139 mg, 0.657 mmol) and (R)-2-amino-3-methyl-1-(pyrrolidin-1-yl)butan-1-one (84 mg, 0.493 mmol) in DCE (2 mL) was stirred at room temperature for 30 min. The reaction mixture was cooled to 0° C. A solution of 1-tert-butyl 3-methyl 4-formyl-1H-pyrrolo[2,3-b]pyridine-1,3-dicarboxylate (100 mg, 0.329 mmol) in DCE (2 mL) was added, followed by acetic acid (1 drop). The reaction was stirred at 0° C. for 30 min and then at room temperature for 3 h. Purification by silica column chromatography (EtOAc/DCM, 0-10%) afforded the title compound as a yellow oil (128 mg, 85%). [M+H] calc'd for C24H34N4O5, 459; found, 459.6. The reaction mixture was cooled to 0° C The reaction was stirred at 0° C. for 30 min at room temperature for 3 h Purification by silica column chromatography (EtOAc/DCM, 0-10%)

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

Procedure: To a solution of 2-phenoxy-5-(2-trimethylsilanyl-ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid (0.10 g, 0.26 mmol), 4-dimethylaminopyridine (0.048 g, 0.39 mmol) and (3-dimethylamino-propyl)-ethyl-carbodiimide (0.075 g, 0.39 mmol) in CH2Cl2 (2 mL) was added (R)-2-amino-3-methyl-1-pyrrolidin-1-yl-butan-1-one (0.066 g, 0.39 mmol) in CH2Cl2 (0.5 mL). The reaction mixture was stirred at room temperature overnight, then quenched with water and extracted with ethyl acetate (3×). The organic layer was washed with water and saturated aqueous NaCl solution and dried over MgSO4, filtered and concentrated. The residue was purified by SiO2 column chromatography (0-100% EtOAc/hexanes) to afford 2-phenoxy-5-(2-trimethylsilanyl-ethoxymethyl)-5H-pyrrolo[2,3-b]pyrazine-7-carboxylic acid [(R)-2-methyl-1-(pyrrolidine-1-carbonyl)-propyl]-amide as a yellow oil. quenched with water extracted with ethyl acetate (3×) The organic layer was washed with water and saturated aqueous NaCl solution dried over MgSO4 filtered concentrated The residue was purified by SiO2 column chromatography (0-100% EtOAc/hexanes)

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

Procedure: A mixture of sodium triacetoxyborohydride (139 mg, 0.657 mmol) and (R)-2-amino-3-methyl-1-(pyrrolidin-1-yl)butan-1-one (84 mg, 0.493 mmol) in DCE (2 mL) was stirred at room temperature for 30 min. The reaction mixture was cooled to 0° C. A solution of 1-tert-butyl 3-methyl 4-formyl-1H-pyrrolo[2,3-b]pyridine-1,3-dicarboxylate (100 mg, 0.329 mmol) in DCE (2 mL) was added, followed by acetic acid (1 drop). The reaction was stirred at 0° C. for 30 min and then at room temperature for 3 h. Purification by silica column chromatography (EtOAc/DCM, 0-10%) afforded the title compound as a yellow oil (128 mg, 85%). [M+H] calc'd for C24H34N4O5, 459; found, 459.6. The reaction mixture was cooled to 0° C The reaction was stirred at 0° C. for 30 min at room temperature for 3 h Purification by silica column chromatography (EtOAc/DCM, 0-10%)