214630-22-5Relevant academic research and scientific papers
Straightforward access to high-performance organometallic catalysts by fluoride activation: Proof of principle on asymmetric cyanation, asymmetric Michael addition, CO2 addition to epoxide, and reductive alkylation of amines by tetrahydrofuran
Chusov, Denis,Tsygankov, Alexey A.
, p. 13077 - 13084 (2021/11/01)
We demonstrate that well-known transition metal catalysts can be transformed into high-performance versions by the simple use of a fluoride anion source. In situ fluoride-activated catalysts are highly active catalytic species. The isolation may lead to degradation of the species or a decrease in catalytic activity. Fluoride activation of known, relatively simple catalysts resulted in the development of one of the most efficient catalytic systems for the asymmetric cyanation of aldehydes, asymmetric Michael addition, and synthesis of cyclic carbonates. Furthermore, the fluoride-assisted reductive opening of tetrahydrofuran (THF) with amines was developed. We believe that the proposed approach can find broad applications in the enhancement of known catalytic processes and in the design of new ones.
Chiral Metal-Organic Framework Decorated with TEMPO Radicals for Sequential Oxidation/Asymmetric Cyanation Catalysis
Li, Zijian,Liu, Yan,Kang, Xing,Cui, Yong
supporting information, p. 9786 - 9789 (2018/08/28)
A chiral porous metal-organic framework (MOF) decorated with radicals has been successfully constructed by cocrystallizing achiral (2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO)-substituted tricarboxylate and enantiopure VO(salen)-derived dipyridine ligands. The chiral MOF can function as an efficient heterogeneous catalyst for the sequential alcohol oxidation/asymmetric cyanation of aldehyde reactions with enhanced activity and enantioselectivity compared to the homogeneous counterpart.
Enantioselective cyanosilylation of aldehydes catalyzed by novel camphor derived Schiff bases-titanium(IV) complexes
B?ocka, Ewelina,Bosiak, Mariusz J.,We?niak, Miros?aw,Ludwiczak, Agnieszka,Wojtczak, Andrzej
, p. 554 - 562 (2014/05/06)
Five tridentate Schiff bases have been prepared from (1R,2S,3R,4S)-3-amino- 1,7,7-trimethylbicyclo[2.2.1]heptan-2-ol and salicylaldehydes. X-ray structure investigation revealed differences in their molecular conformation, and their titanium(IV) complexes
Dismantling the salen framework: Design of new asymmetric silylcyanation catalysts
Ternel, Jeremy,Roussel, Pascal,Agbossou-Niedercorn, Francine,Gauvin, Regis M.
, p. 580 - 583 (2013/03/28)
A series of novel chiral phenoxyimine Al(iii) complexes catalyzes asymmetric addition of SiMe3CN to a broad range of aldehydes with high yields and good to excellent enantioselectivities in the presence of a Lewis base.
Enantioselective cyanation of aldehydes catalyzed by bifunctional salen-aluminum complex
Lv, Chengwei,Miao, Cheng-Xia,Xu, Daqian,Wang, Shoufeng,Xia, Chungu,Sun, Wei
, p. 138 - 140,3 (2020/07/31)
Chiral N-oxide salen ligands and their corresponding Al complexes were synthesized. Notably, the catalytic activity and asymmetric induction ability of the bifunctional N-oxide salen-Al for asymmetric cyanosilylation were compared with that of bi-componen
Asymmetric induction by helical poly(amino acid)s in cyanosilylation of aldehydes
Akagawa, Kengo,Kudo, Kazuaki
supporting information, p. 5981 - 5983,3 (2020/08/20)
It was first demonstrated that helical poly(amino acid)s have an ability to induce enantioselectivity in the cyanosilylation of aldehydes. The helicity of poly(amino acid)s and the N-terminal amino group were essential for the enantioinduction of the reaction.
Fine modification of salen ligands - Effects on the salen-Ti-catalyzed asymmetric cyanosilylation of aldehydes
Lv, Chengwei,Cheng, Qigan,Xu, Daqian,Wang, Shoufeng,Xia, Chungu,Sun, Wei
supporting information; experimental part, p. 3407 - 3411 (2011/09/12)
New bifunctional N-oxide salen-TiIV complexes and a pyrrolidine salen-TiIV complex in combination with achiral N-oxide were developed and applied to the asymmetric addition of trimethylsilyl cyanide to aldehydes. Notably, both enanti
A practical Ti-salen catalyst based on dimeric salen ligand for asymmetric addition of trimethylsilyl cyanide to aldehydes
Lv, Chengwei,Xu, Daqian,Wang, Shoufeng,Miao, Cheng-Xia,Xia, Chungu,Sun, Wei
experimental part, p. 1242 - 1245 (2012/01/06)
A dimeric salen ligand derived from L-tartaric acid was synthesized through linking two salen units with 1,6-dibromohexane. The corresponding Ti complex was proved to be an efficient catalyst for asymmetric addition of trimethylsilyl cyanide to aldehydes,
The synthesis of novel tetradentate ligands derived from salen and their application in enantioselective silylcyanation of aldehydes
Lv, Chengwei,Wu, Mei,Wang, Shoufeng,Xia, Chungu,Sun, Wei
experimental part, p. 1869 - 1873 (2010/11/19)
Two new tetradentate ligands derived from salen have been prepared and their titanium complexes are used as chiral catalysts in the enantioselective silylcyanation of aldehydes, which give the silyl ethers of cyanohydrins in moderate to good enantiomeric
An efficient titanium catalyst for enantioselective cyanation of aldehydes: Cooperative catalysis
Zhang, Zhipeng,Wang, Zheng,Zhang, Ruzhou,Ding, Kuiling
supporting information; experimental part, p. 6746 - 6750 (2010/12/24)
(Figure Presented) Two-in-one: The integration of two salen/ Ti=O units into one molecule allows the enantioselective cyanation of aldehydes to afford the enantioenriched natural or nonnatural cyanohydrin derivatives with turnover numbers of 1960-172000 a
