From furan to open-chain systems. Synthesis of C1–C9 fragment of tylonolide

Stereoselective synthesis of C1–C9 subunit of macrocyclic lactone—tylonolide is presented. Starting from 2-methylfuran and crotyl alcohol, a 2,5-disubstituted furan derivative was synthesized. Its oxidation leads to α,β-unsaturated dicarbonyl intermediate which has been transformed into acyclic fragment bearing five consecutive asymmetric centers.