The first totalsynthesis of (−)-fructigenine A and a novel approach to (−)-5-N-acetylardeemin through a common imine intermediate (+)-3 are described. The key steps include highly enantioselective preparation of (+)-3 via domino olefination/isomerization/Claisen rearrangement (OIC) of 5, reductive cyclization (RC), and regioselective oxidation of (−)-4 and a novel assembly of the pyrazino ring of