1H-1,2,4-Triazole → HCID 23039725, compound

Participants

Reaction Conditions

Reaction Steps

The mesylate prepared in accordance with (a) is reacted with the sodium salt of 1,2,4-triazole. This is effected by dissolving 0.83 g of sodium in 30 ml of methanol, adding 2.5 g of 1,2,4-triazole and removing the solvent in vacuo. A solution of 8.55 g of the mesylate in 30 ml of dimethyl sulfoxide is added to the residual sodium salt. After being heated for 5 hours on a bath at 120° C., the mixture is cooled to room temperature and extracted with diethyl ether. The combined extracts are washed with water, dried over sodium sulfate and concentrated in vacuo. Yield of crude product 7.6 g. The crude product is purified by column chromatography (silica gel; 1:4 ethyl acetate/petroleum ether) and affords a colourless oil, which crystallises after a few days. Recrystallisation from 16 ml of petroleum ether gives 3.7 g of the end product. Melting point 67° C. 100 MHz-1H-NMR (CDCl3): δ=7.63 and 7.72 ppm (s, 2H of triazole); 7.0-7.4 ppm (m, 3H, aromatic); 4.8 ppm (m, 2H, --CH2N); 3.2-3.8 ppm (m, 2H, --OCH2 --CH3); 1.7-2.4 ppm (m, 2H, --CH2CH2CH3); 1.3 ppm (t, 3H, --OCH2CH3); 0.7-1.4 ppm (m, 5H, --CH2CH2CH3).

Provenance & Evidence