A two-step, protecting-group-free synthesis of the natural product balasubramide, using an Yb(OTf)3-catalyzed intramolecular epoxide opening, is reported. Both enantiomers of the natural product are available from the antipodal forms of the starting epoxycinnamic acid.
balasubramide - biomimetic synthesis - lanthanide catalysis - chiral resolution - indole natural product