Hydrochloric Acid → HCID 20073302, compound

Participants

Reaction Steps

A solution of 14 g (00.33 mol) of N-[3-(diethylamino)propyl]-4-(4-methoxyphenyl)-5-phenyl-1H-pyrazole-1-acetamide of example 38 and 0.16 mol of the sodium salt of 1-propanethiol in 375 mL of DMF was heated at 155°-160° C. for 2 hours. The reaction was chilled and the excess thiopropoxide was neutralized with ethanolic HCl. The DMF solution was stripped under vacuum at 30°, dissolved in methylene dichloride, and washed with aqueous sodium carbonate, the water, and finally brine. The methylene chloride was dried over sodium sulfate and the solvent removed in vacuo to yield 13.4 g of gummy product. Seven grams of the gummy product was chromatographed on a silica gel column eluted with methanol/isopropylamine/chloroform (2:3:95) to yield 5.1 g of purified product. The residue was taken up in isopropyl acetate, washed twice with water, washed once with brine, and dried over sodium sulfate. The isopropyl acetate was evaporated in vacuo, but removal of the last traces of isopropyl acetate required extensive drying under vacuum to yield 2.5 g of product as a glass.

Provenance & Evidence