Hydroxyamine hydrochloride → HCID 87950639, compound

Reaction equation

O=[C:2]([C:11]1[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=1)[CH2:3][CH2:4][CH2:5][C:6]([O:8][CH2:9][CH3:10])=[O:7].Cl.[NH2:18][OH:19].C([O-])(=O)C.[Na+]>C(O)C>[OH:19]/[N:18]=[C:2](/[C:11]1[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=1)\[CH2:3][CH2:4][CH2:5][C:6]([O:8][CH2:9][CH3:10])=[O:7]

Participants

Procedure

A mixture of ethyl 5-oxo-5-phenylpentanoate (8.00 g), hydroxylamine hydrochloride (3.03 g), sodium acetate (4.47 g) and ethanol (70 ml) was heated under reflux for 15 hours. The reaction mixture was concentrated, and the residue was diluted with water and extracted with ethyl acetate. The ethyl acetate layer was washed with water, dried (MgSO4), and then concentrated. The residue was subjected to column chromatography on silica gel, and ethyl E-5-hydroxyimino-5-phenylpentanoate (7.55 g, yield 88%) was obtained as crystals from a fraction eluted with ethyl acetate-hexane (1:3, v/v). Recrystallization from hexane gave colorless crystals. m.p. 28-30° C.