N,N'-Dicyclohexylurea → Tyramine

Temperature

70 °C

Formation of the tyramide of compound III, is as follows. N-hydroxysuccinimide (33 mg) is dissolved In the reaction mixture prepared above by heating to 70° C., then dicyclohexylcarbodiimide (61 mg) is added. This is reacted at 70° C. for 90 minutes, an additional amount (6 mg) of the carbodimide is added and the reaction is continued for another 30 minutes. The mixture is cooled to 0° C. and the precipitated dicyclohexylurea is settled by centrifugation. The supernatant, containing 6-(-4′-N-hydroxysuccinimidyl carboxy phenyl)-3,8-bis bromoacetamidyl-5-methylphenanthridinium chloride (IV) is recovered. A solution of tyramine [4-(2′-amino)ethylphenol] (1.0 g) in water (5 ml) is formed by bringing it to pH 7 by addition of concentrated HCl. This solution is added to the supernatant containing compound IV and reacted at room temperature for one hour. This mixture is then reduced to a red oil by evacuation at 60° C., and is then extracted with water to remove excess tyramine. Compound (VI) is then recrystalized from ethanol-acidified with HCl.

1. customprepared above
2. customThis is reacted at 70° C. for 90 minutes
3. temperatureThe mixture is cooled to 0° C.
4. customis recovered

ORD record

ord-584542e6e4774c4e8c335d516bdd3175

Source dataset

uspto-grants-2001_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06239271B1