Facile methods for preparing diketide and triketide thioesters are disclosed. The resulting thioesters may be used as intermediates in the synthesis of desired polyketides, and may contain functional groups which ultimately reside in side chains on the resulting polyketide and thus can be used further to manipulate the polyketide so as form derivatives. The polyketides produced may also be tailored by glycosylation, hydroxylation and the like. New polyketides and their derivatives and tailored forms are thereby produced.
The constitutions of seven metabolites formed during anaerobic degradation of n-hexane by the denitrifying betaproteobacterium strain HxN1 were elucidated by comparison of their GC and MS data with those of synthetic reference standards. The synthesis of 4-methyloctanoic acid derivatives was accomplished by the conversion of 2-methylhexanoyl chloride with Meldrum's acid. The β-oxoester was reduced
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