Off the top of my head, the route I see is from pimelic acid and isobutylaldehyde, through this
http://www.organic-chemistry.org/abstracts/literature/928.sh...
followed by decarboxylation.
The dibromoacid would be substitution on the half ester of the acid, pimelic is made from salicyic acid via sodium reduction in C5 or C6 alcohol
http://www.orgsyn.org/orgsyn/pdfs/CV2P0531.pdf
All in all a rather bothersome route.
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