New Syntheses of Retinal and Its Acyclic Analog γ ‐Retinal by an Extended Aldol Reaction with a C 6 Building Block That Incorporates a C 5 Unit after Decarboxylation. A Formal Route to Lycopene and β ‐Carotene

Since the C 15 β ‐end‐group aldehyde 10 (( β ‐ionylidene)acetaldehyde), an excellent intermediate in the syntheses of retinoids, can be synthesized in many ways from β ‐ionone, and since the corresponding acyclic C 15 ψ ‐end‐group aldehyde 5 can easily be synthesized from citral ( 1 ) ( Scheme 3 ),...

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Veröffentlicht in:	Helvetica chimica acta 2007-03, Vol.90 (3), p.512-520
Hauptverfasser:	Valla, Alain, Valla, Benoist, Le Guillou, Régis, Cartier, Dominique, Dufossé, Laurent, Labia, Roger
Format:	Artikel
Sprache:	eng
Online-Zugang:	Volltext
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