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Ruthenium(II) complexes catalyze the CC coupling of 1,1‐disubstituted allenes and fluorinated alcohols to form homoallylic alcohols bearing all‐carbon quaternary centers with good to complete levels of diastereoselectivity. Whereas fluorinated alcohols are relatively abundant and tractable, the corresponding aldehydes are often not commercially available because of their instability.
Keine Schutzgruppen: Eine Synthese des C2‐symmetrischen Makrodiolids Cyanolid A in sechs Stufen ausgehend von Neopentylglycol und Allylacetat beruht auf einer iridiumkatalysierten doppelten asymmetrischen Allylierung und einer Tandemreaktion aus Kreuzmetathese und Oxa‐Michael‐Cyclisierung zur Bildung des substituierten Pyranrings. Die Synthese gelang ohne Einsatz von Schutzgruppen, chiralen Auxiliaren...
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