C1CCC(N=C=NC2CCCCC2)CC1.[NH2:16][CH:17]([CH2:21][CH3:22])[C:18](O)=[O:19].[CH2:23]([NH:30][CH2:31][C:32](OCC)=[O:33])[C:24]1[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=1.C(O)(C(F)(F)F)=O>C(Cl)Cl>[CH2:21]([C@@H:17]1[NH:16][C:32](=[O:33])[CH2:31][N:30]([CH2:23][C:24]2[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=2)[C:18]1=[O:19])[CH3:22]To a solution of DCC (5.07 g) in DCM (140 mL) at 0° C. was added N—BOC-L-□-aminobutyric acid (5 g) followed by ethyl JV-benzylglycinate (4.6 mL) dropwise. The resulting solution was stirred at 0° C. for 2 h and RT 1 h, filtered and the concentrated to give an oil. This was dissolved in DCM (100 mL) and TFA (100 ml) and stirred for 1 h. The solution was concentrated under reduced pressure. The residue was stirred in saturated aq NaHCO3 (125 ml) and EtOAc (125 ml) for 6 h. The organics were separated, dried (Na2SO4), and concentrated to give the sub title compound as a white solid. (5.68 g).
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