A novel, C2-symmetric, chiral bis-cyclosulfinamide-olefin tridentate ligand in Rh-catalyzed asymmetric 1,4-additions
作者:Li Zhang、Mingchao Tan、Lihong Zhou、Qingle Zeng
DOI:10.1016/j.tetlet.2018.06.008
日期:2018.7
A C2-symmetric, chiral bis-cyclosulfinamide-olefin ligand composed of two 1-oxo-2,3-dihydro-1,2-benzisothiazole moieties with rigid skeletons and a conformationally flexible butenylene chain is disclosed for the first time. HRMS and 1H NMR analyses verify that the in situ-generated complex of the ligand and [Rh(C2H4)2Cl]2 possesses a rhodium (I) center coordinated to the tridentate ligand via two sulfinyl
首次公开了由两个具有刚性骨架和构象柔性的丁烯链的1-氧代-2,3-二氢-1,2-苯并噻唑结构部分组成的AC 2对称的手性双环亚磺酰胺-烯烃配体。HRMS和1 H NMR分析证实,该配体与[Rh(C 2 H 4)2 Cl] 2原位生成的络合物具有通过两个亚磺酰基部分和一个CdbndC键与三齿配体配位的铑(I)中心。手性配体在Rh催化的芳基硼酸与环己烯酮和环戊烯酮的不对称1,4-加成反应中提供了极高的对映选择性(高达> 99%ee)。与类似的手性二齿配体相比,三齿配体具有更高的对映选择性。
Practical Method for Asymmetric Addition of Arylboronic Acids to α,β-Unsaturated Carbonyl Compounds Utilizing an In Situ Prepared Rhodium Catalyst
作者:Kirill Lukin、Qunying Zhang、M. Robert Leanna
DOI:10.1021/jo802136j
日期:2009.1.16
A new practical method for the asymmetric Michael addition of arylboronic acids to α,β-unsaturated carbonyl compounds utilizing in situ generated chiral rhodium-binap-based catalyst has been developed to address the unavailability of the preformed catalysts. While maintaining high levels of enantioselectivity reported for the preformed catalysts, the new method provides a convenient access to either
For the first time the room-temperature rhodium-catalyzedasymmetric1,4-addition of potassium aryltrifluoroborates to α,β-unsaturated substrates is described. Thanks to the use of a chiral diene as ligand for rhodium and triethylamine as base, to facilitate transmetalation of the boron species, high yields and enantioselectivities were generally achieved. Moreover, the use of such tetravalent boron
Room-Temperature Rh-Catalyzed Asymmetric 1,4-Addition of Arylboronic Acids to Maleimides and Enones in the Presence of CF<sub>3</sub>-Substituted MeOBIPHEP Analogues
作者:Florent Le Boucher d’Herouville、Anthony Millet、Michelangelo Scalone、Véronique Michelet
DOI:10.1021/jo201073y
日期:2011.8.19
has been developed for the 1,4-addition of boronic acids to maleimides and enones under mild conditions at room temperature and led to succinimide derivatives and arylated cyclic ketones in good to excellent yields and ee. We uncovered the crucial role of the electronic and steric properties of diphosphine ligand and observed a strong boronic acid/ligand dependency in the case of maleimide derivatives
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