[CH2:1]([C:3]1[N:4]2[CH2:10][CH2:9][CH:8]([C:11]([OH:13])=[O:12])[C:5]2=[N:6][N:7]=1)C.[Li+].[OH-]>C1COCC1.O.CO>[CH3:1][C:3]1[N:4]2[CH2:10][CH2:9][CH:8]([C:11]([OH:13])=[O:12])[C:5]2=[N:6][N:7]=1To a solution of ethyl 6,7-dihydro-5H-pyrrolo[2,1-c][1,2,4]-triazole-7-carboxylic acid (400 mg, 2.05 mmol) in THF/water/MeOH was added LiOH (250 mg, 10.25 mmol) and the resulting solution was heated via oil bath to 60° C. for 16 h. (Round bottom was equipped with a condenser.) The solution was cooled to room temperature and concentrated to remove organic solvents. The aqueous layer was then acidified to pH of ˜5 using 2N HCl. The mixture was concentrated to dryness under vacuum, azeotroping with toluene (2×20 mL) to make sure all water was removed. The material was used without further purification with lithium chloride as a by-product. LC-MS: m/z (ES)=168 (MH)+.
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