74292-20-9Relevant academic research and scientific papers
Enantioselective Au(i)-catalyzed dearomatization of 1-naphthols with allenamides through Tethered Counterion-Directed Catalysis
Yu, Yunliang,Zhang, Zhenhao,Voituriez, Arnaud,Rabasso, Nicolas,Frison, Gilles,Marinetti, Angela,Guinchard, Xavier
supporting information, p. 10779 - 10782 (2021/10/20)
The Tethered Counterion-Directed Catalysis (TCDC) approach has been applied to the enantioselective Au(i) catalyzed dearomatizations of 1-naphthols with allenamides. Stereocontrol is ensured by the intramolecular ion-pairing between the chiral gold-tether
PROCESS FOR POLYMERIZING BETA-BUTYROLACTONE
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Paragraph 0120; 0124; 0125-0129; 0130-0132, (2020/12/03)
A process for polymerizing β-butyrolactone is disclosed comprising contacting racemic β-butyrolactone or an enantiomer thereof with a catalyst/initiator system which comprises a rare earth metal, a chiral ligand, at least one nucleophilic ligand, optional
Chiral Metallacycles as Catalysts for Asymmetric Conjugate Addition of Styrylboronic Acids to α,β-Enones
Hong, Tao,Zhang, Zibin,Sun, Yan,Tao, Jia-Ju,Tang, Jia-Dong,Xie, Chunsong,Wang, Min,Chen, Fang,Xie, Shang-Shu,Li, Shijun,Stang, Peter J.
supporting information, p. 10244 - 10249 (2020/09/21)
Introducing self-assembly strategies into the construction of catalysts has been proven to have great advantages in asymmetric catalysis. We constructed two chiral metalla-triangles by highly efficient coordination-driven self-assembly from a chiral 3,3′-dipyridyl-substituted BINOL donor. They were successfully applied in asymmetric conjugate addition of a series of α,β-unsaturated ketones with trans-styrylboronic acids. The use of these metalla-triangles as supramolecular catalysts is obviously conducive to the enhancement of catalytic activity and stereoselectivity in the presented addition reactions. Under induction of the chiral metalla-triangles, an array of α,β-enones were converted to chiral ?,I-unsaturated ketones in medium to quantitative yields (40-98%) with high enantioselectivities (87-96% ee).
Tethered Counterion-Directed Catalysis: Merging the Chiral Ion-Pairing and Bifunctional Ligand Strategies in Enantioselective Gold(I) Catalysis
Frison, Gilles,Guinchard, Xavier,Marinetti, Angela,Retailleau, Pascal,Smal, Vitalii,Voituriez, Arnaud,Zhang, Zhenhao
supporting information, p. 3797 - 3805 (2020/03/10)
Tethering a metal complex to its phosphate counterion via a phosphine ligand enables a new strategy in asymmetric counteranion-directed catalysis (ACDC). A straightforward, scalable synthetic route gives access to the gold(I) complex of a phosphine displaying a chiral phosphoric acid function. The complex generates a catalytically active species with an unprecedented intramolecular relationship between the cationic Au(I) center and the phosphate counterion. The benefits of tethering the two functions of the catalyst are demonstrated here in a tandem cycloisomerization/nucleophilic addition reaction, by attaining high enantioselectivity levels (up to 97% ee) at an unusually low 0.2 mol % catalyst loading. Remarkably, the method is also compatible with a silver-free protocol.
Enantioselective vinylation of aldehydes with the vinyl Grignard reagent catalyzed by magnesium complex of chiral BINOLs
Wang, Pei,Ma, Guo-Rong,Yu, Sheng-Li,Da, Chao-Shan
supporting information, p. 79 - 86 (2018/12/13)
Enantioselective vinylation of aldehydes via direct catalytic asymmetric Grignard reaction of aldehdyes and the vinyl Grinard reagent is a long-standing challenge. This work demonstrated that the magnesium (S)-3,3′-dimethyl BINOLate enantioselectively catalyze the direct vinylation of aldehydes with the deactivated vinylmagnesium bromide by bis(2-[N,N′-dimethylamino]ethyl) ether (BDMAEE) in the addition of n-butylmagnesium chloride. The highest ee of 63% was achieved up to date.
Axially Chiral peri-Xanthenoxanthenes as a Circularly Polarized Luminophore
Takaishi, Kazuto,Hinoide, Sakiko,Matsumoto, Tomoki,Ema, Tadashi
supporting information, p. 11852 - 11857 (2019/08/16)
A series of axially chiral peri-xanthenoxanthenes (PXXs) were synthesized from 1,1′-bi-2-naphthol without optical resolution. These are the first examples of chiral PXXs. Among them, PXX 5 with two naphthalene rings connected via a methylenedioxy bridge and a chiral axis displayed intense fluorescence (FL) and circularly polarized luminescence (CPL) both in solution (φFL of 0.72 and |glum| of 1.4 × 10-3) and in the solid state (φFL of 0.13 and |glum| of 4.8 × 10-3). The bridged structure of PXX 5 adjusts the angle between the vectors of the electric and magnetic transition dipole moments, which is essential for showing intense CPL activity.
Fluorescent Recognition of 1,3-Diaminopropane in the Fluorous Phase – Greatly Enhanced Sensitivity and Selectivity
Shi, Dan,Wang, Xinjing,Yu, Shanshan,Zhao, Feng,Wang, Yachen,Tian, Jun,Hu, Lingling,Yu, Xiaoqi,Pu, Lin
supporting information, p. 1053 - 1059 (2018/03/06)
A 1,1′-binaphthyl-based dialdehyde, which is soluble in the fluorous phase, is synthesized. The fluorescence of this compound is greatly enhanced by 1,3-diaminopropane (DAP) in perfluorohexane (FC-72) but not by other amines and diamines. Thus, this compound can be used as a fluorescent sensor for the detection of the biologically important DAP at submicromolar concentrations. The selectivity and sensitivity of this fluorescent probe in this fluorous solvent are much greater than those in the common organic solvent dichloromethane.
Click-binol-phosphoric acid catalysts in intramolecular enantioselective oxidative C[sbnd]H-bond functionalization
Stockerl, Sebastian,Gutiérrez, Daniel,García Manche?o, Olga
, p. 572 - 585 (2016/12/16)
Counteranion-catalysis represents an appealing but challenging approach for the development of enantioselective oxidative C[sbnd]H bond functionalization reactions. In this work, a new family of 3,3′-triazolyl BINOL-derived phosphoric acids was synthesized and employed in the intramolecular asymmetric C[sbnd]H bond functionalization of N-aryl substituted tetrahydroisoquinolines. As previously reported with related structures, the presence of the triazole groups on the catalysts was key to attain enantioselectivity. Our study also shows the importance of choosing the appropriate regioisomeric triazole groups at the BINOL backbone to achieve a more efficient chirality transfer. Moderate enantiomeric ratios were obtained with the N-benzamide substrates, whereas the change of the nature of the nucleophile fragment was translated to a dramatic loss of the enantioselectivity. Therefore, it can be foreseen that there is a need for designing further superior catalyst structures to develop future counter-anion organocatalyzed asymmetric C[sbnd]H bond functionalization reactions.
A mechanistic study of the Lewis acid-Br?nsted base-Br?nsted acid catalysed asymmetric Michael addition of diethyl malonate to cyclohexenone
Samoilichenko, Yuri,Kondratenko, Veronica,Ezernitskaya, Mariam,Lyssenko, Konstantin,Peregudov, Alexander,Khrustalev, Victor,Maleev, Victor,Moskalenko, Margarita,North, Michael,Tsaloev, Alan,Gugkaeva, Zalina T.,Belokon, Yuri
, p. 90 - 101 (2017/08/14)
The Michael addition of diethyl malonate (Michael Donor, MD) to cyclohexenone (Michael Acceptor, MA) catalysed by the mono-lithium salt of (S)- or (R)-BIMBOL in dichloromethane is shown to exhibit biomimetic behavior. A combination of kinetics, spectrosco
Tree of macromolecule loaded dinaphthol Asia phosphorus amide ligand, its synthetic method and its application
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Paragraph 0046; 0047; 0048, (2017/04/22)
The invention discloses dendrimer polymer loaded binaphthol phosphoramidite ligand and a synthesis method thereof and application of the dendrimer polymer loaded binaphthol phosphoramidite ligand in asymmetric Michael addition reaction of diethyl zinc to
