PubMed · 1201130
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G M Fanelli. Uricosuric agents.. https://doi.org/10.1002/art.1780180731
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A molecule library containing 55 aurone- and thioaurone-type structures has been designed and synthesised. Reversed phase high performance liquid chromatographic (RP-HPLC) method has been developed to separate these compounds and to characterise their lipophilicity by experimental method (k'). The experimental lipophilicity data have been compared with the computer calculated lipophilicity parameters (CLOGPs) of the same molecules. In general, good correlations between the measured and calculated lipophilicities have been found with the exception of structure isomers and compounds capable for hydrogen bonding. The chromatographic method was suitable to separate the structure (ortho and para) isomers of aurone and thioaurones and was sensitive enough to differentiate their lipophilicities. Our findings suggest the usefulness of the chromatographic method in fast characterisation of the lipophilicity of structurally closely related molecules.
[reaction: see text] The synthesis of eupomatilone-6 (1) has been achieved by using Suzuki coupling, Sharpless asymmetric dihydroxylation, and intramolecular Horner-Wadsworth-Emmons reactions. The spectroscopic studies carried out on synthetic eupomatilone-6 do not agree with those reported for the natural product, and therefore revision of the assigned structure is warranted.
Density functional theory (DFT) calculations at the B3LYP/6-31G* level for isobenzofuran1 and eleven benzannulated derivatives of types2 and3 have been performed in order to compare their relative reactivities as dienes in Diels-Alder reactions. The transition state (TS) energies for their reactions with ethylene have been determined and shown to form a linear correlation between activation energies and structure count (SC) ratios. TS energies as a method for comparison of diene reactivities can be applied to IBFs bearing substituents on the ring as well as those containing heteroatoms, for which the SC ratio method failed. Different measures of aromaticity of benzannulated IBFs indicated a decrease in aromaticity going from 4 to 14, which is also reflected in their reactivity as a dienes in Diels-Alder reaction.