Enantioselective Conjugate Addition of 2-Acylimidazoles with Nitroalkenes Promoted by Chiral-at-Metal Rhodium(III) Complexes
作者:Ganesh Kumar Thota、Gui-Jun Sun、Tao Deng、Yi Li、Qiang Kang
DOI:10.1002/adsc.201701377
日期:2018.3.20
An enantioselective conjugate addition of 2‐acylimidazoles with nitroalkenes catalyzed by chiral‐at‐metal rhodium(III) complex under mild reaction conditions was developed, affording versatile γ‐nitro ketone skeletons in good yields with excellent enantioselectivities (up to >99% ee).
A visible-light-activated rhodium complex in enantioselective conjugate addition of α-amino radicals with Michael acceptors
作者:Shao-Xia Lin、Gui-Jun Sun、Qiang Kang
DOI:10.1039/c7cc03650g
日期:——
We report an efficient enantioselective conjugateaddition of photogenerated α-amino radicals to Michaelacceptors catalyzed by a newly prepared chiral-at-metal rhodium complex. This protocol shows that a single Rh(III) complex can serve not only as a Lewis acid but also as a photoredox catalyst to control the stereoselectivity during the bond formation.
Chiral-at-Metal Rh(III) Complex Catalyzed Asymmetric Conjugate Addition of Unactivated Alkenes with α,β-Unsaturated 2-Acyl Imidazoles
作者:Kuan Li、Qian Wan、Qiang Kang
DOI:10.1021/acs.orglett.7b01456
日期:2017.6.16
A newly prepared chiral-at-metal Rh(III) complex catalyzed highlyefficientasymmetricconjugateaddition of para-vinylanilines with α,β-unsaturated 2-acyl imidazoles is developed, affording the corresponding adducts in 67–95% yields with 86–95% ee. Remarkably, employing as low as 0.05 mol % of Rh(III) complex as catalyst, a gram-scale reaction still affords the desired product in 81% yield with 92%