Acetic Acid → HCID 67440655, compound

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Reaction Steps

A mixture of 5-(4-Cyano-2-formylphenoxy)-1,3-dihydro-1-hydroxy-2,1-benzoxaborole (D23) (0.400 g, 1.43 mmol), morpholine (0.375 mL, 4.29 mmol), and acetic acid (0.246 mL, 4.29 mmol) in methanol (10 mL) was stirred for five minutes under nitrogen at room temperature. Cyanoborohydride (0.270 g, 4.29 mmol) was added, and the mixture was stirred at room temperature under nitrogen for two hours. Water was added and the mixture was extracted with ethyl acetate. The organic layer was washed with brine and dried over anhydrous sodium sulfate. The solvent was removed under reduced pressure and the residue was purified by silica gel chromatography (5:5 ethyl acetate: hexanes to 4:1 dichloromethane/methanol). The desired fractions were combined and the solvent was removed under reduced pressure. Water and toluene were added and removed under reduced pressure to give pure 4-(1-hydroxy-1,3-dihydrobenzo[c][1,2]oxaborol-5-yloxy)-3-(morpholinomethyl)benzonitrile (0.399 g, 80%).

Provenance & Evidence