2007
DOI: 10.1002/anie.200604518
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Enantioselective Intramolecular Aldol Addition/Dehydration Reaction of a Macrocyclic Diketone: Synthesis of the Musk Odorants (R)‐Muscone and (R,Z)‐5‐Muscenone

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Cited by 48 publications
(12 citation statements)
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“…The direct conversion of diketone 375 to enantioenriched (S)-376 by enantioselective aldol condensation was later disclosed (Scheme 45 C). [295,296] Finally,OHagan has shown in asystematic study that the conformational folding of macrocyclic musks can not only be influenced by double bonds and alkyl substituents,but also by strategic placement of fluorine substituents. [297] CF 2 groups within macrocyclic rings preferentially adopt gauche corner positions and thus lowest-energy conformations can be designed.…”
Section: Reviewsmentioning
confidence: 99%
“…The direct conversion of diketone 375 to enantioenriched (S)-376 by enantioselective aldol condensation was later disclosed (Scheme 45 C). [295,296] Finally,OHagan has shown in asystematic study that the conformational folding of macrocyclic musks can not only be influenced by double bonds and alkyl substituents,but also by strategic placement of fluorine substituents. [297] CF 2 groups within macrocyclic rings preferentially adopt gauche corner positions and thus lowest-energy conformations can be designed.…”
Section: Reviewsmentioning
confidence: 99%
“…The olfactory data of the β,γ‐unsaturated macrocyclic ketones synthesized are summarized in Figure 2, together with their detection thresholds (th) as determined by GC‐olfactometry. In contrast to a (5 Z )‐double bond of 2 ,11f the β,γ‐double bond generally decreases the musk character and intensity of these macrocyclic ketones. Within their respective series, the 16‐membered rings 28 and 29 turned out to be the most potent and the most musky, which also indicates that a β,γ‐double bond does rather populate inactive conformers.…”
Section: Methodsmentioning
confidence: 92%
“…Der industrielle Vorläufer 5-Muscenon (373)erwies sich erstaunlicherweise als potenterer Riechstoff als sein natürliches Pendant. In einem bemerkenswerten Artikel [291] wurde eine Modifikation der ursprünglichen Synthese [292] beschrieben, in der Cyclododecanon (369)i nd rei Stufen in das bicyclische 371 (Schema 44) überführt werden konnte.D ieses wurde dann bei erhçhter Te mperatur und Druck mit Distickstoffmonoxid umgesetzt, was vermutlich durch Fragmentierung des intermediären Heterocyclus [295,296] Zum Schluss sei erwähnt, dass OHagan in einer systematischen Studie zeigen konnte,d ass die Faltungskonformation makrocyclischer Moschusriechstoffe nicht nur durch Doppelbindungen und Alkylsubstituenten sondern auch durch strategische Platzierung von Fluor-Substituenten beeinflusst werden kann. [297] In makrocyclischen Ringen nehmen CF 2 -Gruppen nämlich bevorzugt gauche-Eckpositionen ein, so dass sich niederenergetische Konformere gezielt entwerfen lassen.…”
Section: Angewandte Chemieunclassified