Stereoselective Transformation of Enantiopure Cyclohexenol into <i>cis</i>-Hydrindan. An Enantioselective Formal Total Synthetic Route to (+)-Pumiliotoxin C
A formal total synthesis of (+)-pumiliotoxin C (1), the antipode of the arrow poison frog toxin, starting from the chirally homogeneous (1'S, 6'S)-2-(6'-benzyloxymethyl-2'-cyclohexyl)ethanol (2) is described. The synthesis features the intramolecular nitrile oxide cycloaddition (INOC) reaction of the nitro olefin (5) to furnish the isoxazoline (6).