4-(N,N-dimethlyamino)pyridine; triethylamine; p-toluenesulfonyl chloride in dichloromethane Ambient temperature;

<b>Multi-step reaction with 3 steps<br /> </b>1: NaH / tetrahydrofuran / Ambient temperature<br />2: O₃, NaOH / CH₂Cl₂ <br />3: TBAF / tetrahydrofuran / Ambient temperature<br /> <br /> &nbsp;

<b>Multi-step reaction with 5 steps<br /> </b>1: 75 percent / imidazole, DMAP / dimethylformamide<br />2: In / tetrahydrofuran; H₂O / Ambient temperature<br />3: NaH / tetrahydrofuran / Ambient temperature<br />4: O₃, NaOH / CH₂Cl₂ <br />5: TBAF / tetrahydrofuran / Ambient temperature<br /> <br /> &nbsp;

<b>Multi-step reaction with 3 steps<br /> </b>1: NaH / tetrahydrofuran / Ambient temperature<br />2: O₃, NaOH / CH₂Cl₂ <br />3: TBAF / tetrahydrofuran / Ambient temperature<br /> <br /> &nbsp;