The first synthesis of the proposed structures of chaetoviridins A 1–4 has been achieved in 10 steps by controlling the syn- or anti-aldol side chain. The angular lactone has been regioselectively introduced by condensation of a chiral dioxin-4-one to cazisochromene. Comparison of the NMR and circular dichroism data of the synthesized and reported natural products led to the complete reassignment and
Azaphilones from the Endophyte <i>Chaetomium globosum</i>
作者:Warley S. Borges、Gabriela Mancilla、Denise O. Guimarães、Rosa Durán-Patrón、Isidro G. Collado、Mônica T. Pupo
DOI:10.1021/np200110f
日期:2011.5.27
Six new azaphilones, 5′-epichaetoviridin A (7), 4′-epichaetoviridin F (9), 12β-hydroxychaetoviridin C (10), and chaetoviridins G–I (11–13), and six known azaphilones, chaetoviridins A–E (1–5) and 4′-epichaetoviridin A (8), were isolated from the endophytic fungus Chaetomiumglobosum cultivated in PDB medium for 21 days. The structure elucidation and the assignment of the relative configurations of