Potassium Carbonate → 2-[1-(4-chloro-benzyl)-1H-pyrazol-3-yl]-4-methyl-thiazole-5-carboxylic acid (pyridin-3-ylmethyl)amide

Participants

Reaction Conditions

Reaction Steps

To a solution of 4-methyl-2-(2H-pyrazol-3-yl)-thiazole-5-carboxylic acid (pyridin-3-ylmethyl)-amide (0.2 g, 0.67 mmol) in dimethyl sulfoxide (5 mL) was added with 4-chlorobenzyl bromide (0.14 g, 0.67 mmol) and potassium carbonate (0.30 g, 2.0 mmol). The reaction mixture was heated to 90° C. for 16 hr. The reaction mixture was cooled to room temperature, diluted with ethyl acetate (50 mL), and washed with brine (2×50 mL). The organic phase was dried (Na2SO4) and evaporated. The residue was purified by preparative thin layer chromatography over silica gel (methylene chloride:methanol, 95:5) to provide 2-[1-(4-chloro-benzyl)-1H-pyrazol-3-yl]-4-methyl-thiazole-5-carboxylic acid (pyridin-3-ylmethyl)amide as a white solid (0.071 g, 51% yield). 1H NMR (400 MHz, CDCl3) δ 8.60 (s, 1H), 8.54-8.56 (m, 1H), 7.71 (d, J=8 Hz, 1H), 7.39 (s, 1H) 7.26-7.33 (m, 3H), 7.18 (d, J=4 Hz, 2H), 6.84 (d, J=4 Hz, 1H), 6.18-6.21 (m, 1H), 5.31 (s, 2H), 4.62 (d, J=4 Hz, 2H), 2.74 (s, 3H). MS (M+H)+=423.9; Rt=1.29 min; HRMS (M+H)+=424.10.

Provenance & Evidence