Hydrogen Peroxide → HCID 118276615, compound

Participants

Reaction Steps

Adapting literature known protocols (Tercel, et al., J. Med. Chem. 1995, 38, 1247-1252; and Kirkpatrick, et al., U.S. Pat. No. 7,399,785), peracetic acid (H3CCO3H) is freshly prepared by adding hydrogen peroxide (H2O2) (1.5 mL of a 35 wt-% aqueous solution, 14.0 mmol) dropwise to acetic anhydride (Ac2O) (1.52 mL, 1.65 g, 16.0 mmol). When the reaction mixture is homogeneous, a solution of tert-butyl(3R)-4-[5-[bis(2-chloroethyl)amino]-2-methyl-phenyl]-3-(tert-butoxycarbonylamino)butanoate (6e) (1.61 g, 3.29 mmol) in dichloromethane (DCM) (20 mL) is added with vigorous stirring at about room temperature for about 2 h. The reaction is followed by TLC and/or LC/MS to completion. The reaction is quenched with 2.0 N hydrochloric acid (HCl), and the aqueous layer separated and repeatedly washed with DCM to the organic extracts are colorless. The aqueous phase is evaporated to dryness under reduced pressure, dried over anhydrous sodium sulfate (Na2SO4), and partially reduced in volume. Diethyl ether (Et2O) is added to separate the title compound 3-[(2R)-4-tert-butoxy-2-(tert-butoxycarbonylamino)-4-oxo-butyl]-N,N-bis(2-chloroethyl)-4-methyl-benzeneamine oxide (22a). The material may be purified by silica gel column chromatography.

Provenance & Evidence