Rapid Total Synthesis of (±)Trigonoliimine A via a Strecker/Houben–Hoesch Sequence

Abstract

A novel synthetic route to the hexacyclic system of trigonoliimine A was accomplished in four steps from N-phthaloyl 6-OMe-tryptamine. Key reactions include a three-component Strecker-type reaction to fashion the two C-N bonds in the D ring and a subsequent Houben-Hoesch type cyclization to deliver the characteristic seven-membered C ring.