[C:1]([O:5][C:6]([NH:8][C:9]1([C:12]([NH:14][N:15]2[CH:19]=[CH:18][C:17]([Cl:20])=[C:16]2[C:21]([O:23]C)=O)=O)[CH2:11][CH2:10]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].[NH3:25]>O.CCOC(C)=O>[Cl:20][C:17]1[CH:18]=[CH:19][N:15]2[C:16]=1[C:21]([OH:23])=[N:25][C:12]([C:9]1([NH:8][C:6](=[O:7])[O:5][C:1]([CH3:2])([CH3:3])[CH3:4])[CH2:11][CH2:10]1)=[N:14]2A stirred solution of methyl 1-(1-((tert-butoxycarbonyl)amino)cyclopropanecarboxamido)-3-chloro-1H-pyrrole-2-carboxylate (500 mg, 1.40 mmol) in water (12 mL) was purged with NH3 gas for 5 minutes. The sealed pressure tube was heated at 110° C. for 12 h. The reaction mixture was dissolved in EtOAc (100 mL) and washed with water (50 mL). The organic layer was separated, dried over Na2SO4 and concentrated under reduced pressure. The residue was purified using CombiFlash ISCO (REDISEP®, SiO2, 12 g, 50% EtOAc/petroleum ether) to give tert-butyl (1-(5-chloro-4-hydroxypyrrolo[2,1-f][1,2,4]triazin-2-yl)cyclopropyl)carbamate (210 mg, 46.3%) as a off-white solid. LCMS Condition B-16: retention time 0.91 min, [M+1]=325.1. 1H NMR (300 MHz, DMSO-d6) δ ppm 1.06-1.10 (m, 2H), 1.37-1.45 (m, 2H), 1.41 (s, 9H), 6.57 (d, J=2.4 Hz, 1H), 7.31 (br s, 1H), 7.51 (d, J=2.4 Hz, 1H), 11.32 (br s, 1H).
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