Stereocontrolled Synthesis of Carbon Chains Bearing Contiguous Methyl Groups by Iterative Boronic Ester Homologations: Application to the Total Synthesis of (+)‐Faranal

Adding links to the chain: A quadruple homologation of a boronic ester converts a simple vinyl iodide into a complex precursor to faranal with very high levels of diastereo- and enantiocontrol. This enables the synthesis of (+)-faranal to be completed in just six steps and 18 % overall yield from propyne.