Acetone → HCID 178491209, compound

Participants

Reaction Conditions

Reaction Steps

A 1 L three-necked round-bottomed flask equipped with a mechanical stirrer, addition funnel and a thermocouple was charged without agitation. 34.2 g of 5-({[2-tert-butoxycarbonylamino-3-(4-carbamoyl-2,6-dimethyl-phenyl)-propionyl]-[1-(4-phenyl-1H-imidazol-2-yl)-ethyl]-amino}-methyl)-2-methoxy-benzoic acid (see Example 9 of US 2005/0203143), 340 ml of acetone, and 17 ml of 204 mmolar concentrated HCl were combined in the flask. The stirring was started and the resulting slurry formed a clear solution. This solution was heated to 45° C. under vigorous stirring and aged at this temperature for a period of two hours. After the completion, the reaction mass was cooled to ambient temperature and the supernatant was removed by suction. The vessel along with the residue was rinsed with 20 ml of acetone and then removed as previously. 170 ml of water was added and the reaction mass and was aged under stirring until a homogeneus solution resulted. This solution was then added over a period of ˜½ hr to a solution of 90 ml of 1N NaOH and water. The pH was adjusted to 6.5-7.0 accordingly. The resulting slurry was aged for about 2 hrs at ambient temperature, cooled to 10-15° C., aged at that temperature for about 1 hr, and then filtered. The solid was washed with 10 ml water, air-dried for a period of 4 to 5 hrs, and then placed in a vacuum oven at 50-55° C. until the water content was less than 3%.

Provenance & Evidence