154194-50-0Relevant academic research and scientific papers
Hydrogen-bonded organic network with appended chiral metal complexes
Saiki, Toshiyuki,Dewa, Takehisa,Aoyama, Yasuhiro
, p. 241 - 248 (2000)
Treatment of anthracenebisresorcinol (1·4H) with La(OiPr)3 and binaphthol (BN·2H) as a chiral ligand affords an amorphous and insoluble 1:2:2 adduct (chiral La host) formulated as (1·2H)2-·2(LaBN)+. This formula
Enantioselective tandem Michael addition/H2-hydrogenation catalyzed by ruthenium hydride borohydride complexes containing β-aminophosphine ligands
Guo, Rongwei,Morris, Robert H.,Song, Datong
, p. 516 - 517 (2005)
A variety of ruthenium(II) catalyst precursors containing β-aminophosphine ligands and a borohydride ligand were found to be active for a one-pot, tandem asymmetric Michael addition/H2-hydrogenation reaction to give the chiral alcohol in excellent diastereomeric excess. The most effective catalyst is 4b, containing the (S)-binap ligand and (R,R)-Pnor ligand, derived from (1S,2R)-norephedrine. Copyright
Catalytic asymmetric Michael reactions promoted by a lithium-free lanthanum-BINOL complex
Sasai,Arai,Shibasaki
, p. 1571 - 1572 (1994)
In this communication, we report a new lithium-free lanthanum-BINOL complex, which is quite effective in catalytic asymmetric Michael reactions. We have succeeded in developing effective asymmetric base catalysts, in particular, asymmetric ester enolate catalysts forasymmetric Michael reactions. Two asymmetric lanthanum complexes are now available, namely, BINOL-lanthanum-lithium complex and the new lithium-free lanthanum-BINOL complex. The two complexes complement each other in their ability to catalyze asymmetric nitroaldol and asymmetric Michael reactions.
Enantioselective Michael reaction catalyzed by well-defined chiral Ru amido complexes: Isolation and characterization of the catalyst intermediate, Ru malonato complex having a metal-carbon bond
Watanabe, Masahito,Murata, Kunihiko,Ikariya, Takao
, p. 7508 - 7509 (2003)
Chiral Ru amido complexes promote asymmetric Michael addition of malonates to cyclic enones, leading to Michael adducts with excellent ee's, in which the chiral Ru amido complexes react with malonates to give isolable catalyst intermediates, chiral Ru malonato complexes bearing a metal bound C-nucleophile. Copyright
Helical foldamer-catalyzed enantioselective 1,4-addition reaction of dialkyl malonates to cyclic enones
Umeno, Tomohiro,Ueda, Atsushi,Doi, Mitsunobu,Kato, Takuma,Oba, Makoto,Tanaka, Masakazu
supporting information, (2019/11/13)
The introduction of a five-membered ring α,α-disubstituted α-amino acid into L-Leu-based heptapeptides preferentially induced right-handed (P) helical structures. Using 5 ~ 20 mol% of a single helical foldamers-catalyst, enantioselective 1,4-addition reactions of dialkyl malonates to cycloalk-2-enones (5 ~ 7 rings) proceeded to give chiral 3-substituted cycloalkanones with 94 ~ 99% ee in moderate chemical yields, regardless of the ring size of substrates.
Catalytic Asymmetric β-C-H Functionalizations of Ketones via Enamine Oxidation
Zhu, Lihui,Zhang, Long,Luo, Sanzhong
supporting information, p. 1672 - 1675 (2018/03/25)
A chiral primary amine catalyzed oxidative β-C-H functionalization of ketone is described. The reaction proceeds via ketone enamine oxidation by IBX and enables highly enantioselective remote C-H functionalization of both cyclic and acyclic ketones, gener
Enzyme-Promoted Direct Asymmetric Michael Reaction by Using Protease from Streptomyces griseus
Wu, Ling-Ling,Li, Ling-Po,Xiang, Yang,Guan, Zhi,He, Yan-Hong
, p. 2209 - 2214 (2017/07/24)
The direct asymmetric Michael addition of malonates and enones was promoted by protease from Streptomyces griseus for the first time. Yields of up to 84% with enantioselectivities of up to 98% enantiomeric excess (ee) were achieved under optimized conditi
Air- and water-tolerant rare earth guanidinium BINOLate complexes as practical precatalysts in multifunctional asymmetric catalysis
Robinson, Jerome R.,Fan, Xinyuan,Yadav, Jagjit,Carroll, Patrick J.,Wooten, Alfred J.,Pericàs, Miquel A.,Schelter, Eric J.,Walsh, Patrick J.
supporting information, p. 8034 - 8041 (2014/06/23)
Shibasaki's REMB catalysts (REMB; RE = Sc, Y, La-Lu; M = Li, Na, K; B = 1,1′-bi-2-naphtholate; RE/M/B = 1/3/3) are among the most enantioselective asymmetric catalysts across a broad range of mechanistically diverse reactions. However, their widespread us
PRECATALYST FOR SHIBASAKI'S RARE EARTH METAL BINOLATE CATALYSTS
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Page/Page column 12-16; 27, (2015/01/07)
Disclosed herein are schemes for the synthesis of novel hydrogen-bonded rare earth- BINOLate precatalyst complexes, the precatalysts, per se, and their application for the generation of anhydrous REMB catalysts by cation-exchange from metal halides.
Mechanistic study of asymmetric Michael addition of malonates to enones catalyzed by a primary amino acid lithium salt
Yoshida, Masanori,Nagasawa, Yuki,Kubara, Ami,Hara, Shoji,Yamanaka, Masahiro
, p. 10003 - 10008 (2013/11/06)
A mechanistic study was carried out for the asymmetric Michael addition reaction of malonates to enones catalyzed by a primary amino acid lithium salt to elucidate the origin of the asymmetric induction. A primary β-amino acid salt catalyst, O-TBDPS β-hom
