Bidirectional Hiyama-Denmark Cross-Coupling Reactions of Bis-silyldeca-1,3,5,7,9-pentaenes for the Synthesis of Symmetrical and Non-symmetrical Carotenoids.

Aurea Rivas,Víctor Pérez‐Revenga,R. Álvarez,A. Lera

Published 2019 in Chemistry

ABSTRACT

The construction of the carotenoid skeleton by Pd-catalyzed Csp2-Csp2 cross-coupling reactions of symmetrical and non-symmetrical 1,10-bissilyldeca-1,3,5,7,9-pentaenes and the corresponding complementary alkenyl iodides has been developed. Reaction conditions for these bidirectional and orthogonal Hiyama-Denmark cross-coupling reactions of bis-functionalized pentaenes are mild and the carotenoid products preserve the stereochemical information of the corresponding oligoene partners. The carotenoids synthesized in this manner include β,β-carotene and (3R,3´R)-zeaxanthin (symmetrical) as well as 9-cis-β,β-carotene, 7,8-dihydro-β,β-carotene and β-cryptoxanthin (non-symmetrical).

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