Five new metabolites including four β-resorcylic macrolides 1–4 and one octahydronaphthalene derivative 5 were isolated from a seagrass-derived fungus Fusarium sp. PSU-ES123 together with seven known compounds. Their structures were characterized by analysis of the spectroscopic data. The absolute configuration was determined by Mosher's method and circular dichroism spectroscopy. Compound 1 displayed
Total synthesis and stereochemical revision of relgro and 10′-oxorelgro
作者:Janardhan Gaddam、G. Sudhakar Reddy、Kanakaraju Marumudi、Ajit C. Kunwar、Jhillu S. Yadav、Debendra K. Mohapatra
DOI:10.1039/c9ob00838a
日期:——
The first asymmetric total synthesis and stereochemical assignments of 10-membered macrolactones relgro and 10'-oxorelgro are disclosed. To this end, palladium-catalyzed Stillecoupling, the Mitsunobu reaction, ring-closing metathesis, EDCI promoted coupling and the Jacobsen hydrolytic kinetic resolution are used as keysteps. The total synthesis followed by thorough evaluation of the optical rotation