triethylamine; magnesium bromide in tetrahydrofuran 18 h; ultrasound bath,;

<b>Multi-step reaction with 2 steps<br /> </b>1: 1.) Mg, ZnBr₂, / 1.) THF, RT; 30 min, 2.) THF, RT;<br />2: 83 percent / CaCl₂ / CH₂Cl₂ / 26 h / Ambient temperature<br /> <br /> &nbsp;

<b>Multi-step reaction with 3 steps<br /> </b>1: 66 percent / CH₂Cl₂ / 2 h / Ambient temperature<br />2: 1.) Mg, ZnBr₂, / 1.) THF, RT; 30 min, 2.) THF, RT;<br />3: 83 percent / CaCl₂ / CH₂Cl₂ / 26 h / Ambient temperature<br /> <br /> &nbsp;