874948-59-1Relevant articles and documents
Hypercrosslinking chiral Br?nsted acids into porous organic polymers for efficient heterogeneous asymmetric organosynthesis
Jia, Ji,Liu, Xiaoming,Ma, Si,Xia, Hong,Zhang, Yuwei,Zhang, Zhenwei
, p. 25369 - 25373 (2021/12/07)
Here, we developed a construction strategy for directly immobilizing the axially chiral phosphoric acid into hypercrosslinked polymers by a one-pot Friedel-Crafts alkylation reaction. The obtained chiral polymers have high porosity, excellent stability and tailorable catalytic centers, and display excellent activity, enantioselectivity and recyclability for asymmetric transfer hydrogenation.
INHIBITORS OF GLUCOSE TRANSPORTERS (GLUTS)
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, (2020/03/29)
The present invention relates to 2,6-methanobenzo[g][1]oxacin-4-onecompounds and their analog compounds and pharmaceutically acceptable salts thereof as selective inhibitor of glucose transporters 1 and 3 (GLUTs 1 and 3), to methods of preparing said compounds, and to the use thereof as pharmaceutically active agents, especially for the prophylaxis and/or treatment of metabolic diseases, immunological diseases, autoimmune diseases, inflammation, graft versus host disease, cancer, and metastasis thereof. Furthermore, the present invention is directed to pharmaceutical composition comprising at least one of 2,6-methanobenzo[g][1]oxacin-4-one compounds and their analog compounds.
N-Boc-aminals as easily accessible precursors for less accessible N-Boc-imines: Facile synthesis of optically active propargylamine derivatives using Mannich-type reactions
Yurino, Taiga,Aota, Yusuke,Asakawa, Daisuke,Kano, Taichi,Maruoka, Keiji
, p. 3687 - 3700 (2016/06/06)
We developed a facile and practical synthesis of N-Boc-aminals, which can be used as precursors for less accessible N-Boc-imines. Aminals were obtained via simple dehydration condensation reactions of t-butyl carbamate (BocNH2) and various aldehydes in acetic anhydride, followed by filtration and washing with hexane. The obtained N-Boc-alkynylaminals could be successfully applied in enantioselective Mannich-type reactions, catalyzed by chiral phosphoric acids, to afford optically active propargylamine derivatives.
Direct Asymmetric Friedel-Crafts Reaction of Naphthols with Acetals Catalyzed by Chiral Bronsted Acids
Qin, Long,Wang, Pei,Zhang, Yixin,Ren, Zhengxiang,Zhang, Xin,Da, Chao-Shan
, p. 571 - 574 (2016/03/01)
The Friedel-Crafts method synthesis of chiral ethers from various acetals and naphthols catalyzed by chiral Bronsted acids with acetic acid as an effective additive is described. We found that the chiral phosphoric acid (R)-TRIP could efficiently catalyze the asymmetric Friedel-Crafts reaction of naphthols with acetals affording chiral ethers in good enantioselectivity and yield.
Bronsted acid-catalyzed, highly enantioselective addition of enamides to in situ-generated ortho-quinone methides: A domino approach to complex acetamidotetrahydroxanthenes
Saha, Satyajit,Schneider, Christoph
supporting information, p. 2348 - 2352 (2015/02/05)
The highly enantioselective conjugate addition of enamides and enecarbamates to in situ-generated ortho-quinone methides, upon subsequent N,O-acetalization, gives rise to acetamido-substituted tetrahydroxanthenes with generally excellent enantio- and dias
Synthesis of novel chiral phosphoric acid-bearing two acidic phenolic hydroxyl groups and its catalytic evaluation for enantioselective Friedel-Crafts alkylation of indoles and enones
Liu, Xiong-Li,Yu, Zhang-Biao,Pan, Bo-Wen,Chen, Lin,Feng, Ting-Ting,Zhou, Ying
, p. 628 - 634 (2015/03/30)
A novel chiral phosphoric acid catalyst bearing two acidic phenolic hydroxyl groups was synthesized. Its catalytic activity as a chiral Br?sted acid has been examined in the enantioselective Friedel-Crafts alkylation of indoles and enones as a model reaction. In comparison with the other chiral phosphoric acid catalysts, the reaction catalyzed by the novel chiral catalyst afforded the desired 3-substituted indoles in a higher enantioselectivity (up to 69% ee).
Enantioselective organocatalytic fluorination-induced Wagner-Meerwein rearrangement
Romanov-Michailidis, Fedor,Guénée, Laure,Alexakis, Alexandre
, p. 9266 - 9270 (2013/09/12)
Cracked under strain: Strained allylic cyclobutanols and cyclopropanols readily undergo a ring expansion described by the title rearrangement. This reaction is promoted by catalytic amounts of 1 and displays high tolerance with respect to the substrate scope. The corresponding β-fluoro spiroketone products are isolated in high yields and with excellent stereoselectivities. EDG=electron-donating group, EWG=electron-withdrawing group. Copyright
Chiral phosphoric acid catalyzed asymmetric friedel-crafts alkylation of indoles with nitroolefins
Tang, Hong-Ying,Zhang, Zhong-Biao
experimental part, p. 2038 - 2046 (2011/11/30)
Asymmetric Michael-type Friedel-Crafts (F-C) alkylations of indoles with nitroolefins catalyzed by a chiral H8-BINOL-based phosphoric acid were investigated. The reactions took place very smoothly in the presence of only 5 mol-% of catalyst at
A protecting-group-free route to chiral BINOL-phosphoric acids
Li, Baojian,Chiu, Pauline
, p. 3932 - 3937 (2011/09/14)
A two-step, protecting group-free route for the synthesis of 3,3′-disubstituted and 6,6′-disubstituted chiral BINOL-phosphoric acids has been realized starting from commercially available brominated BINOLs. This synthesis relies on the direct Suzuki coupl