[CH2:1]([O:3][C:4]([C:6]1[C:7]([CH2:18]Br)=[C:8]2[C:13]([Cl:14])=[C:12]([C:15]#[N:16])[CH:11]=[N:10][N:9]2[CH:17]=1)=[O:5])[CH3:2].O.C([O-])(O)=[O:22].[Na+]>C1COCC1>[CH2:1]([O:3][C:4]([C:6]1[C:7]([CH2:18][OH:22])=[C:8]2[C:13]([Cl:14])=[C:12]([C:15]#[N:16])[CH:11]=[N:10][N:9]2[CH:17]=1)=[O:5])[CH3:2]To a solution of compound 16A (102 mg, 0.30 mmol) in THF (12 mL) was added water (3 mL) dropwise. The reaction was kept at room temperature for 3 days and then heated to 50° C. for 3 hours. Upon cooling to room temperature, NaHCO3 (70 mg) was added to the reaction mixture. The reaction was concentrated to dryness, redissolved in CH2Cl2 and filtered. The filtrate was concentrated to give compound 16B as a yellow solid (84 mg, 100%). This compound was used in the following steps without further purification.
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