Dimethylamine → (E)-N,N-Dimethyl-4-[2-(1H-indazol-3-yl)vinyl]benzamide

Participants

Reaction Steps

A mixture of a solution of (E)-4-[2-(1H-indazol-3-yl)vinyl]benzoic acid obtained in Step 6 in THF (0.125 mol/L, 0.40 mL, 0.05 mmol), a solution of dimethylamine in THF (1 mol/L, 0.08 mL, 0.08 mmol), a solution of 1-hydroxybenzotriazole in THF (0.33 mol/L, 0.20 mL, 0.07 mmol) and polymer-bound 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (1 mol/g, 0.07 g, 0.07 mmol) was shaken at room temperature overnight. The reaction mixture was filtered, the solvent was evaporated by blowing air to the filtrate, and the residue was added with THF (0.6 mL), polyvinylpyridine (0.03 g, 0.29 mmol) and 4-chloroformyl polystyrene (3.5 mol/g, 0.03 g, 0.11 mmol), followed by shaking at room temperature overnight. The reaction mixture was filtered, and the solvent was evaporated by blowing air to the filtrate. The residue was added with ethanol (0.5 mL) and ion-exchange resin [Bio-Rad AG (registered trademark) 1 X-8 OH form, 0.15 g], followed by shaking for 10 minutes. The mixture was filtered, the resin was washed with ethanol, and the adsorbate was eluted with a 4 mol/L solution of hydrogen chloride in ethyl acetate. The solvent was evaporated by blowing air to the eluate, the residue was purified by thin-layer chromatography (chloroform/methanol=9/1) to obtain Compound 1 (0.4 mg, 3%).

Provenance & Evidence