Abstract
The natural and (+)‐enantiomer of 9,10‐epoxytetrahydroedulan 1, (1R,3S,6R,9S,10S)‐9,10‐epoxy‐1,3,7,7‐tetramethyl‐2‐oxabicyclo[4.4.0]decane, the main component of the hairpencil secretion of Euploea klugii, was synthesized via (−)‐dihydroedulan II (2) by starting from (S)‐2,4,4‐trimethyl‐2‐cyclohexen‐1‐ol (D).