93379-48-7Relevant articles and documents
Asymmetric ozone oxidation of silylalkenes using a C2- symmetrical dialkoxysilyl group as a chiral auxiliary
Igawa, Kazunobu,Kawasaki, Yuuya,Nishino, Kosuke,Mitsuda, Naoto,Tomooka, Katsuhiko
, p. 9255 - 9258 (2014)
Ozone oxidation of silyl-substituted alkenes, namely silylalkenes, proceeds in an addition-type manner to afford α-silylperoxy carbonyl compounds in good to excellent yields, without the formation of normal ozonolysis products. Herein the ozone oxidation
Highly enantioselective nickel-catalyzed hydrocyanation of disubstituted methylenecyclopropanes enabled by taddol-based diphosphite ligands
Yu, Rongrong,Fang, Xianjie
, p. 594 - 597 (2020/01/21)
A vast range of novel TADDOL-based diphosphite ligands were first synthesized and applied in the nickel-catalyzed asymmetric hydrocyanation of disubstituted methylenecyclopropanes. By employing these new catalysts, the conversion of diverse methylenecyclo
Chiral Aluminum Complex Controls Enantioselective Nickel-Catalyzed Synthesis of Indenes: C?CN Bond Activation
Luan, Yu-Xin,Peng, Qian,Ye, Mengchun,Zhang, Tao,Zheng, Su-Juan
supporting information, p. 7439 - 7443 (2020/03/24)
A chiral aluminum complex controlled, enantioselective nickel-catalyzed domino reaction of aryl nitriles and alkynes proceeding by C?CN bond activation was developed. The reaction provides various indenes, bearing chiral all-carbon quaternary centers, under mild reaction conditions in yields of 32 to 91 percent and ee values within the 73–98 percent range. The reaction mechanism and aspects of stereocontrol were investigated by DFT calculations.
Phosphite-Catalyzed C?H Allylation of Azaarenes via an Enantioselective [2,3]-Aza-Wittig Rearrangement
Motaleb, Abdul,Rani, Soniya,Das, Tamal,Gonnade, Rajesh G.,Maity, Pradip
supporting information, p. 14104 - 14109 (2019/09/06)
A phosphite-mediated [2,3]-aza-Wittig rearrangement has been developed for the regio- and enantioselective allylic alkylation of six-membered heteroaromatic compounds (azaarenes). The nucleophilic phosphite adducts of N-allyl salts undergo a stereoselective base-mediated aza-Wittig rearrangement and dissociation of the chiral phosphite for overall C?H functionalization of azaarenes. This method provides efficient access to tertiary and quaternary chiral centers in isoquinoline, quinoline, and pyridine systems, tolerating a broad variety of substituents on both the allyl part and azaarenes. Catalysis with chiral phosphites is also demonstrated with synthetically useful yields and enantioselectivities.
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.
Chiral Phosphine–Phosphite Ligands in Asymmetric Gold Catalysis: Highly Enantioselective Synthesis of Furo[3,4-d]-Tetrahydropyridazine Derivatives through [3+3]-Cycloaddition
Du, Qingwei,Neud?rfl, J?rg-Martin,Schmalz, Hans-Günther
supporting information, p. 2379 - 2383 (2018/01/27)
The AuI-catalyzed reaction of 2-(1-alkynyl)-2-alken-1-ones with azomethine imines regio- and diastereoselectively affords furo[3,4-d]tetrahydropyridazines in a tandem cyclization/intermolecular [3+3]-cycloaddition process under mild conditions.
Enantioselective Direct Synthesis of syn- and anti-α,β-Dihydroxy γ-Keto Esters Using a Dinuclear Zinc–AzePhenol Complex
Zhang, Zhao-Fei,Yang, Xiao-Chao,Lu, Hui-Jie,Wang, Min-Can
, p. 785 - 793 (2018/02/21)
A one-step enantioselective direct synthesis of both syn- and anti-α,β-dihydroxy γ-keto esters using a dinuclear zinc–AzePhenol complex is presented. This asymmetric α-hydroxyacetate aldol reaction proceeds in moderate to good yield and with excellent ena
An organocatalyst bound α-aminoalkyl radical intermediate for controlled aerobic oxidation of iminium ions
Motaleb, Abdul,Bera, Asish,Maity, Pradip
supporting information, p. 5081 - 5085 (2018/07/29)
A catalyst bound α-aminoalkyl radical intermediate from iminium is developed to control its formation and reactivity with aerobic oxygen. The influence of the catalyst was demonstrated via the ease of radical intermediate formation and its subsequent reactivity, including the first catalyst-controlled enantioselective aerobic oxidation with a chiral phosphite catalyst.
Enantioselective Ni-Al Bimetallic Catalyzed exo -Selective C-H Cyclization of Imidazoles with Alkenes
Wang, Yin-Xia,Qi, Shao-Long,Luan, Yu-Xin,Han, Xing-Wang,Wang, Shan,Chen, Hao,Ye, Mengchun
supporting information, p. 5360 - 5364 (2018/05/01)
A Ni-Al bimetallic catalyzed enantioselective C-H exo-selective cyclization of imidazoles with alkenes has been developed. A series of bi- or polycyclic imidazoles with β-stereocenter were obtained in up to 98% yield and >99% ee. The bifunctional SPO ligand-promoted bimetallic catalysis proved to be critical to this challenging stereocontrol.
Based on the chiral diamine spiro skeleton chiral phosphorus nitrile catalyst, preparation method and application thereof
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Paragraph 0064; 0067, (2017/08/16)
The invention provides a chiral phosphazene catalyst based on a spiro framework adopting chiral diamine, a preparation method and an application of the chiral phosphazene catalyst. The catalyst has a structure represented in the general formula: (RX-)3P=NR', chiral groups are introduced through R and R', and the catalyst has a structure with two seven-membered rings in centered connection through phosphorspirol. Optically pure tartaric acid or substituted hexahydrophthalic acid or 1,2-cyclopentanedicarboxylicacid,(1R,2S)-rel- is taken as a raw material, chiral diamine is generated through esterification, a Grignard reaction, an optional chlorination reaction, an azido reaction and a reduction reaction of the raw material, then chiral diamine and phosphorus pentachloride have a spirocyclization reaction to construct a phosphorspirol-centered screw ring, the chiral phosphazene molecular catalyst is obtained under the alkaline condition, and a method for substituting azido for hydroxyl directly has good application and popularization value. The catalyst has the advantages of high catalysis efficiency, good stereoselectivity, mild conditions, economy, environmental protection, simplicity and convenience in operation and the like as well as popularization and application prospects.