ethyl 3-amino-2-methylbutanoate

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

Procedure: To ethyl 3-amino-2-methylbutanoate (0.15 g, 1.033 mmol) in dichloromethane (3 mL) was added triethylamine (0.288 mL, 2.066 mmol) followed by the dropwise addition of benzoyl chloride (0.120 mL, 1.033 mmol) at RT. The reaction mixture was stirred at RT for 1 h, partitioned between dichloromethane (20 mL) and 1N HCL (10 mL). The dichloromethane layer was washed with 1N NaOH (10 mL), brine (10 mL), dried over sodium sulfate and concentrated to yield an oil. The oil was subjected to silica gel chromatography using an ISCO setup (12 g silica gel RediSep cartridge, hexane/EtOAc as eluent). The desired fractions are collected and concentrated to yield the title compound (0.066 g, 0.265 mmol, 25.6% yield) as an oil. partitioned between dichloromethane (20 mL) and 1N HCL (10 mL) The dichloromethane layer was washed with 1N NaOH (10 mL), brine (10 mL) dried over sodium sulfate concentrated to yield an oil The desired fractions are collected concentrated

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

Procedure: To (Z)-ethyl 3-amino-2-methylbut-2-enoate (Org. Lett. 2003, 5(25) 4779-4782, 1.1 g, 7.68 mmol) in acetonitrile (15 mL) was added sodium triacetoxyborohydride (4.88 g, 23.05 mmol) in one lot at RT. After the addition of acetic acid (2.0 mL, 34.9 mmol) (pH of reaction mixture ˜6.0), the contents were stirred at RT for 2.5 h. The reaction mixture was concentrated and partitioned between dichloromethane (60 mL) and 20% NaOH (10 mL). The dichloromethane layer is dried over sodium sulfate and concentrated to yield the title compound (1.05 g, 7.23 mmol, 94% yield) as an oil, which was used as such for the subsequent step without further purification. MS found: (M+H)+=146.1. The reaction mixture was concentrated partitioned between dichloromethane (60 mL) and 20% NaOH (10 mL) The dichloromethane layer is dried over sodium sulfate concentrated