Hydrochloric Acid → 2-(4-Chloro-1,6-dihydroxy-1,3-dihydrobenzo[c][1,2]oxaborol-3-yl)acetic acid

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Reaction Steps

To a solution of ethyl 2-(4-chloro-1-hydroxy-6-isopropoxy-1,3-dihydrobenzo[c][1,2]oxaborol-3-yl)acetate (200 mg, 0.74 mmol) in 10 mL THF was added LiOH (100 mg, 2.22 mmol) in 5 mL H2O dropwise at 0° C. The mixture was stirred at room temperature for 1.5 h and acidified to pH=5.0 using 1N HCl (8 mL). The resulting mixture was extracted with EtOAc (3×10 mL). The combined organic layers were dried over anhydrous Na2SO4 and concentrated in vacuo. The residue was use directly in next step reaction without further purification.

Provenance & Evidence