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Three new natural furanones, pulvinulin A (1), graminin C (2), and cis-gregatin B (3), together with the known fungal metabolites, graminin B (4) and 10-norparvulenone (5), were isolated from Pulvinula sp. 11120, an endophytic fungal strain occurring in healthy foliage of Cupressus arizonica (Arizona cypress). The structures of 1 and 2 were elucidated by the analysis of their spectroscopic data and chemical interconversions, and that of 3 was determined by comparison with data for synthetic cis-gregatin B. Comparison of spectroscopic data of 4 and 5 with those reported identified them as graminin B and 10-norparvulenone, respectively. Metabolites 1–4 exhibited antibacterial activity against E. coli.

natural product communications

Pulvinulin A, Graminin C, and cis-Gregatin B – New Natural Furanones from Pulvinula sp. 11120, a Fungal Endophyte of Cupressus arizonica