Pyrrolylpolyenes. Part 6. Synthesis of wallemia A and wallemia E
Abstract
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.