Crimmins, Zhang and Diaz. Org. Let., 2006, ASAP. DOI: 10.1021/ol060704z
Ruthenium-tastic total synthesis of the polyether Mucocin, using three metathesis reactions in this paper. Most interesting was the creation of the central THF as a 2,5-DHF via a Hoye-type activation strategy. This involves using a allyloxymethyl side chain to direct the Ru complex insertion, resulting in preferential formation of the 5-member ring.
Coupling of this fragment to the right-hand piece proceeded via a efficient Sonogashira coupling and subsequent diimide reduction, whilst the left-hand section was inserted via metathesis, in a similar fashion to Mootoo’s synthesis.