58692-70-9Relevant academic research and scientific papers
Planar-chiral ferrocene-based triazolylidene copper complexes: Synthesis, characterization, and catalysis in asymmetric borylation of α,β-unsaturated ester
Haraguchi, Ryosuke,Yamazaki, Tatsuro,Torita, Koki,Ito, Tatsuki,Fukuzawa, Shin-Ichi
supporting information, p. 17578 - 17583 (2020/12/30)
1,2,3-Triazol-5-ylidenes have recently attracted considerable attention as versatile ligands because of their strong electron-donating properties and structural diversities. While some efforts have been devoted to the development of chiral triazolylidene-
Chiral Nitroarenes as Enantioselective Single-Electron-Transfer Oxidants for Carbene-Catalyzed Radical Reactions
Wang, Hongling,Wang, Yuhuang,Chen, Xingkuan,Mou, Chengli,Yu, Shuyan,Chai, Huifang,Jin, Zhichao,Chi, Yonggui Robin
supporting information, p. 7440 - 7444 (2019/10/02)
A new class of chiral oxidants is developed. These readily accessible oxidants contain a nitro group for oxidation and a chiral sulfonamide moiety for stereoselectivity control. The chiral information from the oxidants can effectively transfer to the substrates in carbene-catalyzed β-hydroxylation of enals via single-electron-transfer radical processes. We expect these oxidants to find unique applications in other asymmetric oxidations and oxygen-atom-transferring reactions.
Chiral Bicyclic NHC/Cu Complexes for Catalytic Asymmetric Borylation of α,β-Unsaturated Esters
Miwa, Yuya,Kamimura, Takumi,Sato, Kiyoaki,Shishido, Daichi,Yoshida, Kazuhiro
, p. 14291 - 14296 (2019/11/03)
The potential of using chiral bicyclic NHC ligands that exhibit modularity was investigated in the Cu-catalyzed asymmetric borylation reaction of α,β-unsaturated esters. After screening for ligands and optimization of the reaction conditions, the corresponding products were afforded with good enantioselectivities (up to 85% ee).
Iridium-catalyzed asymmetric hydrogenation of β-keto esters with new phenethylamine-derived tridentate P,N,N-ligands
Wei, De-Quan,Chen, Xiu-Shuai,Hou, Chuan-Jin,Hu, Xiang-Ping
supporting information, p. 237 - 243 (2019/01/21)
A new class of phenethylamine-derived tridentate P,N,N-ligands has been successfully developed. These ligands exhibited good performance in the Ir-catalyzed asymmetric hydrogenation of β-keto esters, affording the corresponding β-hydroxy esters in moderat
On the basis of the phenethylamine skeleton chiral P, N, N ligand compound and its manufacturing method and application (by machine translation)
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Paragraph 0104-0152, (2019/06/13)
The present invention provides a chiral P based on the skeleton of the phenethylamine, N, N ligand compound and its manufacturing method and application, surfactant-ethylamine skeleton chiral P, N, N ligand compound of preparation method is as follows: under the protection of nitrogen, the chiral phenylethylamine - [...] compound with 2 - chloromethyl oxazole oxazoline compounds soluble in the reaction solvent, adding alkali, reflux reaction, filtering, desolvation, column chromatography to obtain the required chiral P, N, N ligand compound. In particular to the β - ketoacid ester compound in asymmetric catalytic hydrogenation reaction. The invention of the phenethylamine skeleton chiral P, N, β - keto ester N ligand can be applied to the asymmetric catalytic hydrogenation reaction, can be high yield and high enantio-selectively for the preparation of chiral β - hydroxy ester. (by machine translation)
Iridium-catalyzed asymmetric hydrogenation of β-keto esters with f-amphox ligands
Qin, Chao,Chen, Xiu-Shuai,Hou, Chuan-Jin,Liu, Hongzhu,Liu, Yan-Jun,Huang, De-Zhi,Hu, Xiang-Ping
supporting information, p. 672 - 676 (2018/02/19)
The iridium-catalyzed asymmetric hydrogenation of β-keto esters with chiral tridentate P,N,N-ligands (f-amphox) has been developed. Under the optimized conditions, a wide range of β-keto esters can be hydrogenated smoothly, affording the corresponding β-hydroxy esters in good to excellent enantioselectivities (up to 95% ee).
Method for preparing chiral beta-hydroxy ester by Ir-catalyzed asymmetric hydrogenation
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Paragraph 0042; 0044; 0084; 0086; 0088, (2018/06/26)
The invention provides a method for preparing a chiral beta-hydroxy ester compound by Ir-catalyzed asymmetric hydrogenation. The method for preparing the chiral beta-hydroxy ester compound comprises the steps as follows: in a glove box filled with nitrogen, [Ir(COD)Cl]2 and a chiral P, N, N ligand are dissolved in anhydrous methanol, stirring is performed at room temperature for 1 hour, and a Ir catalyst is generated; substrate beta-ketoester and a base additive are added, the mixture is placed in an autoclave and hydrogenated under certain reaction pressure; hydrogen gas is slowly released, separation with a silica gel column is performed after a solvent is removed, and product beta-hydroxy ester is obtained. The reaction for preparing chiral beta-hydroxy ester by Ir-catalyzed asymmetrichydrogenation of beta-ketoester has the advantages that conditions are mild, operation is easy, enantioselectivity of the product is high and the like.
Efficient P-Chiral Biaryl Bisphosphorus Ligands for Palladium-Catalyzed Asymmetric Hydrogenation
Jiang, Wenhao,Zhao, Qing,Tang, Wenjun
supporting information, p. 153 - 156 (2018/01/05)
A series of structurally novel P-chiral biaryl bisphosphorus ligands L1-L5 (BABIBOPs) are developed, providing high efficiency for the first time in palladium-catalyzed asymmetric hydrogenation of β-aryl and β-alkyl substituted β-keto esters. With the Pd-L3 (iPr-BABIBOP) catalyst, a series of chiral β-hydroxyl carboxylic esters are formed in excellent enantioselectivities (up to>99% ee) and yields at catalyst loading as low as 0.01 mol%.
Biaryl diphosphine ligand as well as preparation method and application thereof
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Paragraph 0225; 0226; 0227; 0228; 0229, (2018/05/16)
The invention discloses a biaryl diphosphine ligand as well as a preparation method and an application thereof. A biaryl diphosphine ligand compound represented as the formula I in the description ora biaryl diphosphine ligand enantiomer is provided, wherein R is alkyl of C1-C10 or naphthenic base of C3-C30 independently; Ra is hydrogen, alkyl of C1-C10, alkoxy of C1-C4, naphthenic base of C3-C30, halogen, R substituted or unsubstituted phenyl, R substituted or unsubstituted aryl of C10-C30 and R substituted or unsubstituted ceteroary of C4-C15 independently; all R, R and R are halogen, alkyl of C1-C4 or alkoxy of C1-C4 independently. With the adoption of the biaryl diphosphine ligand compound I, a series of chiral beta-hydroxy carboxylates with high optical purity can be effectively prepared through catalyzed synthesis, and the compound is high in economic practicability.
Ir-catalyzed asymmetric hydrogenation of β-keto esters with chiral ferrocenyl P,N,N-ligands
Chen, Xiu-Shuai,Hou, Chuan-Jin,Qin, Chao,Liu, Hongzhu,Liu, Yan-Jun,Huang, De-Zhi,Hu, Xiang-Ping
, p. 12871 - 12875 (2017/03/11)
The Ir-catalyzed asymmetric hydrogenation of β-keto esters with chiral ferrocenyl P,N,N-ligands has been developed. Under the optimized conditions, a wide range of β-keto esters were hydrogenated to afford the corresponding β-hydroxy esters in good to excellent enantioselectivities (up to 95% ee).
