Rhodium(I)-Catalyzed Enantioselective Hydroacylation of Racemic Allenals via Dynamic Kinetic Resolution
作者:Yoshihiro Oonishi、Akihito Hosotani、Takayuki Yokoe、Yoshihiro Sato
DOI:10.1021/acs.orglett.9b01307
日期:2019.6.7
Rhodium(I)-catalyzed enantioselective hydroacylation of 4-allenals was found to proceed smoothly, giving six-membered ketones in good yields (up to 84% yield) with high enantiomeric excess (up to 96% ee) even from racemic allenes as substrates. Mechanistic studies revealed that racemization of the allene moiety in the substrate would occur via a dynamic kinetic resolution (DKR) process during the hydroacylation
Construction of Monocyclic Eight-Membered Rings: Intermolecular Rhodium(I)-Catalyzed [6+2] Cycloaddition of 4-Allenals with Alkynes
作者:Yoshihiro Oonishi、Akihito Hosotani、Yoshihiro Sato
DOI:10.1002/anie.201206508
日期:2012.11.12
Rounding up: A RhI‐catalyzed intermolecular cycloaddition of 4‐allenals with alkynes has been developed that provides various monocyclic eight‐membered rings in good to high yields in a stereoselective manner (see scheme). In addition, the chirality of the starting allene is transferred in this reaction, thereby giving optically active monocyclic eight‐membered ring compounds.