Unusual compounds from exudates of Dionysia diapensifolia and D. gaubae var. megalantha (Primulaceae)

Abstract

Exudates of Dionysia diapensifolia yielded (R)-(+)-3-acetoxy-3-phenyl- propiophenone as a new natural product with a basic dihydrochalcone structure, which was elucidated unequivocally by mass spectrometry and NMR spectroscopy. The sesquiterpenoid carissone was found as the major compound in the exudate of D. gaubae var. megalantha. Sesquiterpenoids have so far not been described as exudate constituents of Primula and Dionysia. Structural identifications are discussed in detail, and the significance of the occurrence of these unusual compounds in exudates of Primulaceae is shortly addressed.