Reaktion #82347

Reaktionsgleichung

N-[3(S)-(benzyloxyformamido)-4-(4-fluorophenyl)-2(R)-hydroxybutyl]-L-proline tert.butyl ester

N-(benzyloxycarbonyl)-L-asparagine

→

N-[3(S)-[[N-(benzyloxycarbonyl)-L-asparaginyl]amino]-4-(4-fluorophenyl)-2(R)-hydroxybutyl]-L-proline tert.butyl ester

Ausbeute 36.0%

Lösungsmittel

ethanol

Reaktionsbedingungen

Aufarbeitung

1. 1
   SonstigeThe catalyst was removed by filtration
2. 2
   Sonstigethe filtrate was evaporated
3. 3
   Sonstigeto give an oil which
4. 4
   SonstigeThe crude product was chromatographed on silica gel using 10% methanol in dichloromethane for the elution

Vorschrift

A solution of 270 mg of N-[3(S)-(benzyloxyformamido)-4-(4-fluorophenyl)-2(R)-hydroxybutyl]-L-proline tert.butyl ester in 50 ml of ethanol was hydrogenated over 30 mg of 10% palladium-on-carbon for 2 hours. The catalyst was removed by filtration and the filtrate was evaporated to give an oil which was coupled with 158 mg of N-(benzyloxycarbonyl)-L-asparagine in a manner analogous to that described in Example 1. The crude product was chromatographed on silica gel using 10% methanol in dichloromethane for the elution. There were obtained 120 mg of N-[3(S)-[[N-(benzyloxycarbonyl)-L-asparaginyl]amino]-4-(4-fluorophenyl)-2(R)-hydroxybutyl]-L-proline tert.butyl ester as a white solid of melting point 163°-164° C.

Quelle