Reaktion #84603

Reaktionsgleichung

Glutamic acid

CDI

→

Glu urea imidazole

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigeall prepared
2. 2
   Sonstigein overall yields
3. 3
   Sonstigeperformed at 0° C. under inert conditions

Vorschrift

Compounds 217-220, 230 and 231a, b, and c were all prepared in overall yields ranging from 20-40% following the route depicted in Scheme 7. The first step, performed at 0° C. under inert conditions used the di-t-butyl ester of Glutamic acid with CDI in the presence of base to form the intermediate Glu-urea-imidazole derivative 2. This intermediate was activated with MeOTf under basic conditions to afford the methylated imidazole 3, which under inert conditions reacted readily with amines. The tert-butyl ester protecting groups were removed using 20% TFA in DCM for 1 to 4 hour at room temperature. Upon completion of the deprotection, the reactions were concentrated on a rotary evaporator or blown dry with nitrogen and purified on a silica column or recrystallized. The final products were tested in vitro and in vivo.

Quelle