Chlorosuccinimide → HCID 136350291, compound

Participants

Reaction Steps

To a solution of (E)-5-phenyl-4-(trifluoromethyl)isoxazole-3-carbaldehyde oxime (step C, 0.360 g, 1.41 mmol) in N,N-dimethylformamide (1.0 mL) at room temperature was added N-chlorosuccinimide (0.281 g, 2.11 mmol) in one portion. The resulting green, homogeneous reaction mixture was stirred at room temperature for 30 min. An additional 220 mg of NCS was added, and the reaction mixture was stirred for an additional 30 min. The reaction mixture was diluted with ethyl acetate (35 mL), washed with a 10% aqueous solution of lithium chloride (2×), and brine. The combined aqueous layers were extracted with ethyl acetate (35 mL), and dried over anhydrous sodium sulfate. Concentration under reduced pressure gave a pale green solid which was triturated with ether and filtered. The white solid was rinsed with ether, and the filtrate was concentrated under reduced pressure and dried under reduced pressure overnight to give a quantitative yield of N-hydroxy-5-phenyl-4-(trifluoromethyl)isoxazole-3-carbimidoyl chloride as a green solid. The compound had an HPLC ret. time=2.72 min. (condition A); LC/MS M+1=291.0. 1H NMR (400 MHz, CDCl3) δ ppm 7.51-7.58 (m, 2H), 7.58-7.64 (m, 1H), 7.70 (d, J=7.48 Hz, 2H), 8.04 (s, 1H), and 9.69 (s, 1H).

Provenance & Evidence