ozone in methanol; dichloromethane T=-78°C; 0.5 h;

<b>Multi-step reaction with 2 steps<br /> </b>1: 55 percent / DMAP / tetrahydrofuran / 19 h / 20 &deg;C<br />2: 11.56 g / KH / dimethylformamide / 3.5 h / 0 - 25 &deg;C<br /> <br /> &nbsp;