Imidazole → N-Boc-5-Iodo-L-norvaline tert-butyl ester

Participants

Reaction Steps

To a solution of t-butyl (S)-5-hydroxy-2-(t-butoxycarbonylamino)-pentanoate (5.79 g, 20.0 mmol), triphenylphosphine (8.13 g, 31.0 mmol) and imidazole (2.04 g, 30.0 mmol) in CH2Cl2 (200 mL) at room temperature is added iodine (6.35 g, 25.0 mmol), portionwise, over 30 minutes. The mixture is then stirred 16 hours at room temperature. Methanol (20 mL) is added to the solution, which is then stirred an additional 1 hour. Solvent is evaporated, and the residue is purified by chromatography (silica, 33% EtOAc/hexane) to yield t-butyl (S)-5-iodo-2-(t-butoxycarbonylamino)-pentanoate as a clear oil.

Provenance & Evidence