[CH:1](O)=[O:2].[CH3:4][O:5][C:6]([C:8]1([NH2:20])[CH2:12][CH2:11][N:10]([C:13]([O:15][C:16]([CH3:19])([CH3:18])[CH3:17])=[O:14])[CH2:9]1)=[O:7].ClC1N=C(OC)N=C(OC)N=1.CN1CCOCC1>CN(C1C=CN=CC=1)C>[CH3:4][O:5][C:6]([C:8]1([NH:20][CH:1]=[O:2])[CH2:12][CH2:11][N:10]([C:13]([O:15][C:16]([CH3:17])([CH3:19])[CH3:18])=[O:14])[CH2:9]1)=[O:7]
Added formic acid (200 mg, 4.34 mmol) to solution of 3-Amino-pyrrolidine-1,3-dicarboxylic acid 1-tert-butyl ester 3-methyl ester (1T) (900 mg, 3.688 mmol); 2-Chloro-4,6 dimethoxy-1,3,5-Triazine (CDMT) (800 mg, 4.556 mmol); DMAP (20 mg), and NMM (400 mg, 4 mmol) at room temperature, then stirred overnight. The solvent was evaporated and the residue extracted with MeCl2 (200 ml), washed with H2O (50 ml), dried over MgSO4, filtered and solvent evaporated yielding a solid which chromatographed on silica gel eluting with 5% MeOH/MeCl2 containing 2% NH4OH yielding 2T as a white solid (725 mg, 72%) LCMS (MH 273) Retention time=2.53 minutes.
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