1: 1.) pyridinium 3-nitrobenzenesulfonic acid, 2.) AcOH / 1.) H2O, reflux, 3 h, 2.) reflux, 1 h 2: 26 percent / H2, Et3N / 10percent Pd/C / ethyl acetate / 3 h / 2585.7 Torr View Scheme

acetic acid; pyridinium paratoluene sulfonic acid 1.) H2O, reflux, 3 h, 2.) reflux, 1 h; Multistep reaction;

<b>Multi-step reaction with 8 steps<br /> </b>1: Base<br />2: conc. HCl<br />4: TFAA; SMSO / CH₂Cl₂ <br />5: H₂ / Raney Ni<br />6: sodium cyanoborohydride<br />7: NaNO₂; aq. HCl<br />8: LAH / tetrahydrofuran<br /> <br /> &nbsp;