Benzenesulfonic Acid → 4-(2-oxo-1,2,4,5-tetrahydro-1,3-benzodiazepin-3-yl)-piperidine-1-carboxylic acid-{(R)-1-(3,4-diethyl-benzyl)-2-[4-(1-methyl-piperidin-4-yl)-piperazin-1-yl]-2-oxo-ethyl}-amide benzenesulphonate

Participants

Reaction Steps

1.0 g (1.52 mmol) of 4-(2-oxo-1,2,4,5-tetrahydro-1,3-benzodiazepin-3-yl)-piperidine-1-carboxylic acid-{(R)-1-(3,4-diethyl-benzyl)-2-[4-(1-methyl-piperidin-4-yl)-piperazin-1-yl]-2-oxo-ethyl}-amide and 0.24 g (1.52 mmol) benzenesulphonic acid were refluxed in 20 mL isopropanol. Then the solution was continuously cooled over three days from 50° C. to 25° C., during which time a crystalline precipitate was formed. The solid formed was filtered off, washed with isopropanol and dried.

Provenance & Evidence