Isolation and Structures of New Azaphilone Derivatives, Falconensins E-G, from Emericella falconensis and Absolute Configurations of Falconensins A-G

抄録

Three new azaphilone derivatives designated falconensins E5 (5), F (6), and G (7) were isolated from the mycelium o Emericella falconensis, along with falconensins A (1), B (2), C (3), D (4), and H (8), and three hopane-type triterpenes, zeorin (9), hepane-7β, 22-diol (10), and hopane-6α, 7β, 22-triol (11). The structures of 5-7 were confirmed by spectroscopic investigation and chemical correlations. The absolute stereochemistry of falconensins A (1) to G(7) was also established.