hydrogenchloride; aluminum amalgam 1.) THF, H2O, 1 h, 2.) EtOAc, H2O, 20 min; Yield given. Multistep reaction;

<b>Multi-step reaction with 5 steps<br /> </b>1: 1.) chlorosulfonic acid / 1.) dioxan, 40 deg C, 30 min, 2.) water<br />2: POCl₃ / acetonitrile; tetrahydrothiophene 1,1-dioxide / 0.17 h / 20 &deg;C<br />3: NH₃ / CHCl₃; H₂O / 1.) 0 deg C, 1 h, 2.) 20 deg C, 1 h<br />4: 63 percent / TiCl₄, Et₃N / CH₂Cl₂ / 1.) 1 h, 0 deg C, 2.) 1 h, 20 deg C<br />5: 99 percent / Zn-Cu / tetrahydrofuran / Heating<br /> <br /> &nbsp;