Acetic Anhydride → N-acetyl-N-[5-methyl-6-(4-pyrrolidin-1-yl-piperidine-1-carbonyl)-3-(3-trifluoromethyl-phenyl)-pyridin-2-yl]-acetamide

Participants

Reaction Steps

A solution of 0.22 g (0.5 mmol) of [6-amino-3-methyl-5-(3-trifluoromethyl-phenyl)-pyridin-2-yl]-(4-pyrrolidin-1-yl-piperidin-1-yl)-methanone (example 7) in 5 ml of acetone was treated with 0.35 ml=0.26 g (2.5 mmol) of Et3N, followed by 0.19 ml=0.21 g (2.0 mmol) of acetic anhydride and the reaction mixture was subsequently heated up to reflux. After 22 hours, it was poured into crashed ice, the pH was adjusted to 8-9 with sodium carbonate solution and it was extracted twice with EtOAc; the organic phases were washed with water, dried over magnesium sulfate, filtered and evaporated. The residue was purified by flash column chromatography (CH2Cl2/MeOH 1:0 to 3:2) to give 0.12 g (51%) the N-[5-methyl-6-(4-pyrrolidin-1-yl-piperidine-1-carbonyl)-3-(3-trifluoromethyl-phenyl)-pyridin-2-yl]-acetamide as light yellow solid [MS: 475.2 (MH+)] and 0.098 g (37%) of N-acetyl-N-[5-methyl-6-(4-pyrrolidin-1-yl-piperidine-1-carbonyl)-3-(3-trifluoromethyl-phenyl)-pyridin-2-yl]-acetamide as yellow solid. MS: 517.2 (MH+).

Provenance & Evidence