Hydrochloric Acid → alpha-(Difluoromethyl)arginine

반응식

Cl.O.[F:3][CH:4]([F:14])[C:5]([NH2:13])([CH2:9][CH2:10][CH2:11][NH2:12])[C:6]([OH:8])=[O:7].Br.C([NH+:18]=[C:19]([NH2:21])S)C.Cl>[OH-].[Na+]>[F:3][CH:4]([F:14])[C:5]([NH2:13])([CH2:9][CH2:10][CH2:11][NH:12][C:19]([NH2:21])=[NH:18])[C:6]([OH:8])=[O:7]

참가 물질

실험 절차

To a solution of 2-difluoromethyl-2,5-diamino-pentanoic acid monohydrate monohydrochloride (5 g or 21.13 mmole) in NaOH 2M (8.5 ml) is added at once ethylthiouronium hydrobromide (7.82 g or 42.26 mmole). The pH of the solution is adjusted to 10.5 with NaOH 2M and maintained to that value for 4 days. The reaction mixture is then neutralized to pH=7 with 1M HCl and concentrated under reduced pressure. The residue is passed on an Amberlite IR 120 H+ form column. Elution with NH4OH 2M affords 2-difluoromethyl-2-amino-5-guanidinopentanoic acid which is recrystallized from H2O/EtOH (2.3 g) m.p. 257° C.