苯基二苯并[去质子化B,F ] tropylidene(8)用LDA /吨-BuOK基葡萄糖接着用廉价的非对映体任一淬火吨-Bu-亚磺酸盐([R或( - )小号) - 11次,得到亚砜烯烃混合(S S ,S C)-9 /(S S ,R C)-10和(R S ,R C)-9 /(R S ,S C)-10的非对映体对分别通过色谱/重结晶可将其分离成四个异构体。光学纯的非对映体配体(S S ,S C)-9和(S S ,R C)-10与[RhCl(coe)2 ] 2反应形成双核络合物(R S ,S C)-11和(R S ,R C)-12,其中双齿配体通过硫和烯烃供体的功能配位金属中心。这些络合物以高达99%ee的对映选择性催化芳基硼酸与环状Michael受体的共轭加成。DFT计算显示了配体烯烃官能团的平面手性的主要影响。在(R S ,S C)-11和(R S ,R C)-12之间观察到的对映选择性
Application of chiral N-tert-butylsulfinyl vinyl aziridines in Rh(i) catalyzed 1,4-addition of aryl boronic acids to cyclic enones
作者:Qian Chen、Chao Chen、Fang Guo、Wujiong Xia
DOI:10.1039/c3cc42673d
日期:——
Chiral N-tert-butylsulfinyl vinyl aziridine ligands prepared from a readily available (R)-tert-butanesulfinamide have been applied in the rhodium-catalyzedasymmetric1,4-addition of arylboronicacids to cyclic enones, which gives high yields and excellent enantioselectivities.
A New Type of Chiral Cyclic Sulfinamide-Olefin Ligands for Rhodium-Catalyzed Asymmetric Addition
作者:Quan Wen、Li Zhang、Jing Xiong、Qingle Zeng
DOI:10.1002/ejoc.201601206
日期:2016.11
A new type of chiral cyclic sulfinamide–olefin ligands, N-allylic 2,3-dihydro-1,2-benzoisothiazole 1-oxides, with 2,3-dihydro-1,2-benzoisothiazole 1-oxide as a unique chiral skeleton, is developed for the highly enantioselective rhodium-catalyzed asymmetric 1,4-addition of α,β-unsaturated cyclic carbonyl compounds and the 1,2-addition of benzil. Both enantiomers of the chiral cyclic sulfinamide–olefin
Chiral N-aryl tert-butanesulfinamide-olefin ligands for rhodium-catalyzed asymmetric 1,4-addition of aryl boronic acids to cyclic enones
作者:Shuai Yuan、Qingle Zeng、Jiajun Wang、Lihong Zhou
DOI:10.24820/ark.5550190.p009.977
日期:——
Chiral N-aryl sulfinamide-olefins which are readily synthesized via C-N coupling and nucleophilic substitution have been used as chiralligands, which demonstrate moderate to excellent asymmetric catalytic performance in the rhodium-catalyzedasymmetric1,4-addition of arylboronicacids to cyclic enones. The chiralligands are readily synthesized via C-N coupling reaction and nucleophilic substitution
Synthesis and evaluation of C2-symmetric bis-sulfinamides as effective ligands in rhodium catalyzed addition of arylboronic acids to cycloalkenones
作者:Omkar Revu、Manoj B. Uphade、Kavirayani R. Prasad
DOI:10.1016/j.tet.2016.07.024
日期:2016.9
Synthesis of novel C2-symmetric 1,2- 1,3- and 1,4- bis-sulfinamides and their use as effective ligands in rhodium (I) catalyzed asymmetric conjugate addition of arylboronic acids to cyclohexenone and cyclopentenones is described. C2-symmetry as well as chirality at the sulfur center in the ligand is crucial for the high enantioselectivity in the 1,4-addition reaction. It was also observed that the