The C16–C22 fragment with the acetylene terminus was constructed through the asymmetric
dihydroxylation of the corresponding olefin, while the 15-iodo-olefin corresponding
to the C11–C15 part was prepared via the asymmetric transfer hydrogenation of the
corresponding acetylene ketone followed by hydrozirconation/iodination. Both pieces
were joined by a Sonogashira coupling, and the product was further converted into
the title compound via a Wittig reaction with the remaining C1–C10 segment and Boland
reduction using Zn with TMSCl.
Key words
DHA metabolite - trihydroxylated DHA - organic synthesis - enyne - Boland reduction
- TMSCl - Hansen protocol