C([O:3][C:4](=[O:12])[CH2:5][N:6]1[CH:10]=[C:9]([CH3:11])[N:8]=[N:7]1)C.CO.[OH-].[Li+].Cl>O1CCCC1>[CH3:11][C:9]1[N:8]=[N:7][N:6]([CH2:5][C:4]([OH:12])=[O:3])[CH:10]=1
To a solution of 0.51 g (3.0 mmol) of ethyl [4-methyl-1H-1,2,3-triazole-1-yl]acetate from step B above in tetrahydrofuran (10 ml), methanol (6 ml) was added 6 mL (6 mmol) of an aqueous 1.0 M lithium hydroxide solution. The resulting mixture was stirred at ambient temperature for 1 h. The reaction mixture was neutralized with 8 mL of a 2 N hydrochloric acid solution which was then evaporated to remove all volatiles. The aqueous phase was extracted with ethyl acetate and the combined organics were washed with brine, dried over magnesium sulfate, filtered and evaporated to dryness to afford the title compound as a white solid (0.40 g, 95%). LC/MS 142 (M+1).
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