A Concise Synthesis of
<i>rac</i>
‐
<i>Ambrox</i>
®
<i>via</i>
the Palladium(0)‐Catalyzed Carboalkoxylation of an Allylic Ammonium Salt, as Compared to a Formaldehyde Hetero
<i>Diels–Alder</i>
Approach
作者:Christian Chapuis、David Skuy、Claude‐Alain Richard
DOI:10.1002/hlca.201900097
日期:2019.7
followed by a 1.5 mol‐% Pd‐catalyzed carbomethoxylation of quaternized 31b, leads to the methyl ester 36a. This latter could also be obtained in optically pure form by carbomethoxylation of the corresponding (+)‐acetate. Final reduction‐cyclization may be conducted as earlier described, towards the desired odoriferous rac‐Ambrox® 38a, or its pure (−)‐enantiomer. Generation of a π‐allyl Pd complex from an allylic
Photochemische Reaktionen. 83. Mitteilung. Verbindungen der 3,4-Dihydrojonon-Reihe als Modelle zur Photochemie γ, δ- bzw. δ, ϵ-ungesättigter Ketone und Aldehyde
作者:Markus Peter Zink、Hans Richard Wolf、Ernst Peter Müller、Wolfhard Bernd Schweizer、Oskar Jeger
DOI:10.1002/hlca.19760590105
日期:——
Compounds of the 3,4-dihydro-ionone series as models for the photochemistry of γ, δ- and δ,ϵ- unsaturated ketones and aldehydes.