I'm stuck in the last step(I hope) of this retrosynthesis:
There will be another cyclization but I don't know how get that
In order to get another cyclopentane I need that C1 attaccks C5 ...but how?!!
Before that I think that the OH- group leaves and I get an aldol condensation
I don't know how closing that ring with an alkene + an α-β unsaturated ketone as main funcitiona l group
PS: I miss the first stage where I oxidize the alcohol using PCC