TRITICONES, SPIROCYCLIC LACTAMS FROM THE FUNGAL PLANT PATHOGEN DRECHSLERA-TRITICI-REPENTIS

Triticones A [1], B [2], C [3], D [4], E [5], and F [6] were isolated from the culture broth of the plant pathogenic fungus Drechslera tritici-repentis (= Pyrenophoria tritici-repentis). The structures of these gamma-lactams were determined by a combination of single crystal X-my diffraction and spectroscopic analyses. A series of 2D nmr experiments has clarified the spectral assignments of triticones A [1] and B [2] and their interconversion.