O-Methylhydroxylamine hydrochloride → N-Methoxy-4-methyl-3-[3-[[(1R,2S)-2-methyl-1-(1-naphthalenyl)-3-(1-pyrrolidinyl)propyl]amino]-2-oxo-1(2H)-pyrazinyl]-benzamide

Participants

Reaction Steps

A solution of iso-propylmagnesium chloride (2M in diethyl ether, 1.2 mL) was added dropwise to a stirred mixture of 4-methyl-3-[3-[[(1R,2S)-2-methyl-1-(1-naphthalenyl)-3-(1-pyrrolidinyl)propyl]amino]-2-oxo-1(2H)-pyrazinyl]-benzoic acid, methyl ester (Example 158b, 90 mg), O-methylhydroxylamine hydrochloride (65 mg) and tetrahydrofuran (2 mL) at room temperature. After 15 min the reaction was quenched with sat. aqueous NH4Cl and extracted into ethyl acetate. The organic phase was dried (Na2SO4), filtered and concentrated in vacuo. Purification by preparative HPLC (Gemini column, 0.1% ammonia: acetonitrile eluent) afforded the title compound as a solid (65 mg). MS: APCI(+ve) 526 (M+H+).

Provenance & Evidence