Late stage Fe(CO)5 promoted double bond migration: total synthesis of limazepines C and D
作者:Guna Sakaine、Gints Smits、Ronalds Zemribo
DOI:10.1016/j.tetlet.2015.06.051
日期:2015.8
The first total syntheses of limazepines C and D were accomplished from inexpensive and readily available starting materials using an iron pentacarbonyl promoted allylamide–enamide double bond migration as a key step. The obtained limazepine C was found to be unstable and undergoes oxidation to limazepine D.
Limazepines A−F, Pyrrolo[1,4]benzodiazepine Antibiotics from an Indonesian <i>Micrococcus</i> sp.
作者:Serge Fotso、T. Mark Zabriskie、Philip J. Proteau、Patricia M. Flatt、Dwi Andreas Santosa、Sulastri、Taifo Mahmud
DOI:10.1021/np800827w
日期:2009.4.24
Chemical structures were determined by spectroscopic methods and by comparison with the NMR data of structurally related compounds. The limazepines belong to the growing group of the pyrrolo[1,4]benzodiazepine antitumor antibiotics isolated from various soil bacteria. Limazepines B1/B2 mixture, C, and E were active against the Gram-positive bacterium Staphylococcus aureus and the Gram-negative bacterium Escherichia