“…The transformation was performed through a non‐nucleophilic base‐catalysed (DBU, DBN, MTBD), [34] or acid‐catalysed (HCl, [35] HClO 4 , [36] TFA and further achiral and chiral acids [37] ) equilibrium enolisation. The saturation of the 6,14‐ endo ‐etheno bridge of 8 a by means of heterogeneous catalytic hydrogenation (H 2 , Pd−C, toluene, 6 bar, 55 °C) resulted in the 6,14‐ endo ‐ethano derivative 7α‐dihydrothevinone ( 9 a ) [38] . In the next step 7α‐dihydrothevinone ( 9 a ) was reacted with 6 equivalents of freshly prepared n ‐propylmagnesium bromide.…”