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
Rhodium(I)-Catalyzed Cyclization of Allenynes with a Carbonyl Group through Unusual Insertion of a CO Bond into a Rhodacycle Intermediate
作者:Yoshihiro Oonishi、Takayuki Yokoe、Akihito Hosotani、Yoshihiro Sato
DOI:10.1002/anie.201308824
日期:2014.1.20
Rhodium(I)‐catalyzed cyclization of allenynes with a tethered carbonyl group was investigated. An unusual insertion of a CO bond into the C(sp2)–rhodium bond of a rhodacycle intermediate occurs via a highly strained transition state. Direct reductive eliminationfrom the obtained rhodacyle intermediate proceeds to give a tricyclic product containing an 8‐oxabicyclo[3.2.1]octane skeleton, while β‐hydride