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Technische Verfahren zur Synthese von Carotinoiden und verwandten Verbindungen aus 6-Oxo-isophoron. V. Synthese von Astacin
Widmer, Erich,Lukac, Teodor,Bernhard, Kurt,Zell, Reinhard
, p. 671 - 683 (2007/10/02)
Starting from optically inactive astaxanthin intermediates, the highly oxygenated carotenoid astacene was synthesized in seven steps (55percent overall yield from 6-oxo-isophorone).Key features of the new approach are base- and acid-catalyzed rearrangements of acetylenic intermediates such as those described in Schemes 2, 7 and 8.
