hydrogenchloride in tetrahydrofuran Ambient temperature;

<b>Multi-step reaction with 2 steps<br /> </b>1: 81 percent / pyridine / CHCl₃ <br />2: 1) Mg, 2) CuBr*Me₂S / 1) THF, 2) THF, a) -40 deg C, b) 0 deg C, 2h, c) r.t.<br /> <br /> &nbsp;