1: zinc(II) chloride / dichloromethane 2: hydrogenchloride; methanol 3: dirhodium tetraacetate / toluene 4: 4-(N,N-dimethlyamino)pyridine; N-ethyl-N,N-diisopropylamine / acetonitrile View Scheme

1: zinc(II) chloride / dichloromethane 2: hydrogenchloride; methanol 3: dirhodium tetraacetate / toluene View Scheme

<b>Multi-step reaction with 3 steps<br /> </b>1: 76.6 percent / toluene / 15 h / Heating<br />2: 90.4 percent / triethylamine, p-toluenesulfonyl azide / acetonitrile / 3 h / Ambient temperature<br />3: 99.1 percent / triethylamine / CH₂Cl₂ / 1 h / 2 &deg;C<br /> <br /> &nbsp;