The pigments (4E,6E,8E,10E)-2,6-dimethyl-5-hydroxy-11-pyrrol-2-ylundeca-4,6,8,10-tetraen-3-one (wallemia A) and (4E,6E,8E,10E)-11-(3-chloropyrrol-2-yl)-2,6-dimethyl-5-hydroxyundeca-4,6,8,10-tetraen-3-one (wallemia E), identical with the compounds extracted from the fungus Wallemia sebi, have been synthesised. Analogous β-enamino ketones were by-products of the synthesis.
F. R. Ahmed and T. P. Toube, J. Chem. Soc., Perkin Trans. 1, 1984, 1577 DOI: 10.1039/P19840001577
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