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
Rhodium(I)-Catalyzed [2+2+2] Cycloaddition between Allene, Alkyne, and Imine<i>via</i>a Strained Azarhodacycle Intermediate
作者:Yoshihiro Oonishi、Yoshio Hato、Yoshihiro Sato
DOI:10.1002/adsc.201500417
日期:2015.10.12
The rhodium(I)-catalyzed intramolecular [2+2+2] cycloadditionbetweenallenes, alkynes, and imines has been developed. This cyclization proceeds via a strainedazarhodacycle, giving a 5,7-fused cyclic amide or a tricyclic product containing an 8-azabicyclo[3.2.1]octane skeleton in high yield.