(i) O3, CH2Cl2, (ii) Zn, AcOH; Multistep reaction;

<b>Multi-step reaction with 5 steps<br /> </b>1.1: pyridine / 42 h / 20 &deg;C / |Inert atmosphere<br />2.1: bromine; iodobenzene / n-heptane / 2.5 h / -5 &deg;C / |Inert atmosphere<br />3.1: pyridine; ozone / dichloromethane / 1 h / |Molecular sieve; |Inert atmosphere<br />4.1: n-butyllithium / tetrahydrofuran; hexane / 0.08 h / -10 - 20 &deg;C / |Inert atmosphere<br />4.2: 0.5 h / 20 &deg;C<br />5.1: pyridine / 42 h / 20 &deg;C / |Inert atmosphere<br /> <br /> &nbsp;

<b>Multi-step reaction with 3 steps<br /> </b>1.1: pyridine; ozone / dichloromethane / 1 h / |Molecular sieve; |Inert atmosphere<br />2.1: n-butyllithium / tetrahydrofuran; hexane / 0.08 h / -10 - 20 &deg;C / |Inert atmosphere<br />2.2: 0.5 h / 20 &deg;C<br />3.1: pyridine / 42 h / 20 &deg;C / |Inert atmosphere<br /> <br /> &nbsp;