posted on 2017-09-27, 17:33authored byBingxian Liu, Panjie Hu, Ying Zhang, Yunyun Li, Dachang Bai, Xingwei Li
Rh(III)-catalyzed [3 + 2] annulation
of cyclic N-sulfonyl or N-acyl ketimines
with activated alkenes
has been realized, leading to the synthesis of spirocycles with three
continuous stereogenic centers. This atom-economic reaction proceeded
efficiently under mild and redox-neutral conditions via a C–H
activation pathway, and the coupling is diastereodivergent, with the
diastereoselectivity being controlled by silver additives.