Ammonia → L-Norleucine, 6-azido-, methyl ester

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Reaction Steps

1-Azido-4-[(2R,5S)-3,6-dimethoxy-2-isopropyl-2,5-dihydro-5-pyrazinyl]butane (2.17 g, 7.72 mmol) was dissolved in 30 ml dioxane and a solution of 1.28 ml conc. HCl in 30 ml water (15.45 mmol) was added dropwise, the mixture stirred under argon at ambient temperature overnight. Ammonia solution was added until pH 9 was reached, the solution extracted with chloroform, dried (MgSO4), and the valine methyl ester was removed by bulb-to-bulb distillation (0.05 torr, 25° C.).

Provenance & Evidence