Isolation and Structure Elucidation of Cruentarens A and B — Novel Members of the Benzolactone Class of ATPase Inhibitors from the MyxobacteriumByssovorax cruenta
analysis. Both compounds are isomers of a C22 polyketide with a 2-hydroxy-4-methoxybenzoic acid terminus, which forms a 12-membered lactone in 1 and a six-membered lactone in 2. An amino group at C-22 is acylated by a 3-hydroxy-2-methylhexanoic acid group whose absolute configuration has been determined by GC analysis after hydrolysis and stereoselective synthesis. Degradation of 2 by olefin cross-metathesis