Selective Deprotection Method of <i>N</i>‑Phenylcarbamoyl Group

We report an improved method for the selective deprotection of the <i>N</i>-phenylcarbamoyl group, which yields the corresponding alcohol without affecting other protecting groups. Deprotection was performed using di-<i>tert</i>-butyl dicarbonate and tetra-<i>n</i>-butylammonium nitrite (Boc₂O and Bu₄NNO₂) in pyridine at room temperature. This method is also effective for deprotecting the fluorous <i>N</i>-phenylcarbamoyl group