A marine sesquiterpene, pleraplysillin-1 was synthesized by way of coupling of an ochtodane derivative with 3-furfuryl bromide, and regio- and stereoselective olefinations.
A furyl sesquiterpene pleraplysillin-1 (1), which possesses the ochtodane skeleton (2) in the molecule, was synthesized regio- and stereoselectively starting from the ochtodane type monoterpene (5). Two approaches were investigated: One is the route by way of the benzenesulfenyl chloride addition to a sesquiterpene (9) or (13) which involve the whole carbon framework of 1 and the exocyclic E- or Z-double