Preparation of long-chain β-enaminones and β-diketones from long-chain 3,5-disubstituted isoxazole compounds

Rapid and efficient biphasic liquid extraction of metals with bio-derived lipophilic β-diketone

A bio-derived lipophilic β-diketone (14,16-hentriacontanedione) was isolated from wheat straw wax and tested in the liquid biphasic removal of Ni²⁺, Co²⁺, Cu²⁺ and Cr³⁺ in comparison to dibenzoylmethane and acetylacetone.

Acetate-Derived Metabolites from the Brown Alga Lobophora variegata

Seven new nonadecaketides (1-7), lobophorols A-C, lobophopyranones A and B, and lobophorones A and B, along with the first naturally occurring related metabolites (8-10), were isolated from specimens of Lobophora variegata collected from the Canary Islands. Their structures were determined by extensive spectroscopic methods. In addition, an insight into the biosynthesis of these compounds on the basis of the involvement of type III polyketide synthases is proposed. Lobophorol A (1) showed significant antibacterial activity against Staphylococcus aureus.

Synthesis of pluraflavin A "aglycone"

The "aglycone" of pluraflavin A (2) has been synthesized. The key features of this synthesis include a 1,3-dipolar cycloaddition between a nitrile oxide (cf. 14) and an olefin (22) to yield an isoxazoline followed by subsequent conversion into the gamma-pyrone of pluraflavin A. The epoxide moiety linked to the pyrone is installed prior to Diels-Alder installation of the D ring, which allows access to a number of potentially active cytotoxic intermediates en route to the final compound. The preliminary in vitro results of two such compounds are also included with the racemic title compound exhibiting cytotoxicity in the nanomolar range.