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.
Rh(I)-Catalyzed Formal [6 + 2] Cycloaddition of 4-Allenals with Alkynes or Alkenes in a Tether
作者:Yoshihiro Oonishi、Akihito Hosotani、Yoshihiro Sato
DOI:10.1021/ja203824v
日期:2011.7.13
Rh(I)-catalyzed formal [6 + 2] cycloaddition of allenal 6 having an alkyne or alkene in a tether proceeded smoothly, giving 5-8- and 6-8-fused bicyclic ketone derivatives 7 in good to excellent yields. It was also found that cyclization of enantiomericallyenriched (S)-6a (94% ee) gave cyclic ketone derivative (S)-7a in high yield with reasonable chirality transfer (86% ee). This result indicates that