1: in diphenylether T=250°C; Fischer indolization; 0.5 h; 2: With palladium on activated charcoal in diphenylether T=250°C; 3 h;

<b>Multi-step reaction with 2 steps<br /> </b>1: 75 percent / hydrazine hydrate / 2-ethoxy-ethanol / 36 h / Heating<br />2: 75 percent / acetic acid / 16 h / 20 &deg;C<br /> <br /> &nbsp;