Total Synthesis and Stereochemical Assignment of Actinoranone

The total synthesis of four actinoranone stereoisomers led to unambiguous assignment of relative and absolute stereochemistry of the natural product. Key features of the convergent, fully stereocontrolled route include the use of a Negishi carbozirconation/iodination, a Friedel–Crafts cyclization, a Felkin-controlled addition reaction, a Mitsunobu reaction, and a late-stage C−H oxidation.