78603-95-9Relevant academic research and scientific papers
Simple primary β-amino alcohols as organocatalysts for the asymmetric Michael addition of β-keto esters to nitroalkenes
Begum, Zubeda,Sannabe, Haruka,Seki, Chigusa,Okuyama, Yuko,Kwon, Eunsang,Uwai, Koji,Tokiwa, Michio,Tokiwa, Suguru,Takeshita, Mitsuhiro,Nakano, Hiroto
, p. 203 - 209 (2021/02/09)
Simple primary β-amino alcohols act as an efficient organocatalysts in the asymmetric Michael addition of β-keto esters with nitroalkenes affording highly pure chiral Michael adducts. Also, both enantiomers of the adducts were obtained, depending on the specific catalyst used and reaction temperature.
The Asymmetric Aza-silyl-Prins Reaction: Synthesis of Enantiopure Piperidines
Mittapalli, Ramana R.,Guesné, Sebastien J. J.,Parker, Robert J.,Klooster, Wim T.,Coles, Simon J.,Skidmore, John,Dobbs, Adrian P.
supporting information, p. 350 - 355 (2019/01/11)
The design and development of the first asymmetric aza-silyl-Prins reaction is reported, giving rise to valuable and diverse piperidines and pipecolic acid derivatives in both high yields and as single enantiomers. The creation of a novel chiral auxiliary-homoallylic amine for the aza-silyl-Prins reaction is essential to its success.
Catalytic intramolecular hydroamination of aminoallenes using titanium complexes of chiral, tridentate, dianionic imine-diol ligands
Sha, Fanrui,Mitchell, Benjamin S.,Ye, Christopher Z.,Abelson, Chase S.,Reinheimer, Eric W.,Lemagueres, Pierre,Ferrara, Joseph D.,Takase, Michael K.,Johnson, Adam R.
, p. 9603 - 9616 (2019/07/09)
Alkylation of d- or l-phenylalanine or valine alkyl esters was carried out using methyl or phenyl Grignard reagents. Subsequent condensation with salicylaldehyde, 3,5-di-tert-butylsalicylaldehyde, or 5-fluorosalicylaldehyde formed tridentate, X2/sub
Hybrid-Type Squaramide-Fused Amino Alcohol Organocatalysts for Enantioselective Nitro-Aldol Reaction of Nitromethane with Isatins
Chennapuram, Madhu,Subba Reddy,Seki, Chigusa,Okuyama, Yuko,Kwon, Eunsang,Uwai, Koji,Tokiwa, Michio,Takeshita, Mitsuhiro,Nakano, Hiroto
, p. 1638 - 1646 (2017/04/06)
A series of hybrid-type squaramide-fused amino alcohol (SFAA) catalysts were synthesized, and their catalytic efficiency in the enantioselective nitro-aldol reaction of various isatins with nitromethane has been described. This transformation afforded chiral 3-substituted 3-hydroxyoxindoles in excellent chemical yields (up to 99 %) with high enantioselectivities (up to 95 % ee). The resulting chiral 3-hydroxyoxindoles can be further used as synthetic precursors for the synthesis of several natural products that have a broad spectrum of fascinating biological activities.
NeoPHOX - A structurally tunable ligand system for asymmetric catalysis
Padevět, Jaroslav,Schrems, Marcus G.,Scheil, Robin,Pfaltz, Andreas
supporting information, p. 1185 - 1195 (2016/07/06)
A synthesis of new NeoPHOX ligands derived from serine or threonine has been developed. The central intermediate is a NeoPHOX derivative bearing a methoxycarbonyl group at the stereogenic center next to the oxazoline N atom. The addition of methylmagnesiu
Simple primary β-amino alcohol catalyzed enantioselective Diels-Alder reaction of 3-hydroxy-2-pyridones
Takahashi, Toshihisa,Subba Reddy,Kohari, Yoshihito,Seki, Chigusa,Furuyama, Taniyuki,Kobayashi, Nagao,Okuyama, Yuko,Kwon, Eunsang,Uwai, Koji,Tokiwa, Michio,Takeshita, Mitsuhiro,Nakano, Hiroto
, p. 5771 - 5776 (2016/12/03)
The simple primary β-amino alcohol catalyzed Diels-Alder reaction of 3-hydroxy-2-pyridones as dienes with N-substituted maleimides to provide the highly substituted optically active isoquinuclidines as a single diastereomers in excellent enantioselectivities (up to 98%) with excellent chemical yields (up to 95%) was demonstrated. A range of simple β-amino alcohols were synthesized from the corresponding inexpensive amino acids and their catalytic activity was examined for this reaction.
Bisoxazolidine ligand and a catalyst using the same (by machine translation)
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Paragraph 0024; 0125, (2017/03/08)
PROBLEM TO BE SOLVED: To establish a manufacturing method of a bisoxazolidine ligand and a catalytic reaction using the same.SOLUTION: There is provided a bisoxazolidine ligand represented by the formula (1) or (2). (1) (2), where Ris any of CH3, CH(CH3)2
A method for producing an optically active Alkylaminosulfonamide deriv. β-amino alcohol derivative and optically active
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Paragraph 0051; 0052, (2016/10/17)
PROBLEM TO BE SOLVED: To provide a method for producing an optically active alkylaminosulfonamide derivative useful in pharmaceutical applications etc., and an optically active β-aminoalcohol derivative. SOLUTION: The optically active alkylaminosulf
Synthesis and applications in Henry reactions of novel chiral thiazoline tridentate ligands
Shi, Ye,Li, Yang,Sun, Jingbo,Lai, Qi,Wei, Chiyu,Gong, Zhiyong,Gu, Qiang,Song, Zhiguang
, p. 661 - 667 (2015/09/28)
Several novel chiral tridentate ligands containing thiazoline were efficiently synthesized from commercially available l=cysteine in high yield. These ligands were subsequently applied to the asymmetric Henry reaction of nitromethane and various aldehydes. It was found that the structures of the thiazoline ligands had a significant influence on the enantioselectivity. It was shown that the optimal catalyst for this reaction was a ligand complexed with CuCl, which was formed from chiral thiazoline with chiral aminoalcohol. At -20°C, with 10 mol% of this ligand, a product with (S)-configuration was isolated in 93% yield and 98% enantiomeric excess.
Silyloxy Amino Alcohol Organocatalyst for Enantioselective 1,3-Dipolar Cycloaddition of Nitrones to α,β-Unsaturated Aldehydes
Otsuki, Teppei,Kumagai, Jun,Kohari, Yoshihito,Okuyama, Yuko,Kwon, Eunsang,Seki, Chigusa,Uwai, Koji,Mawatari, Yasuteru,Kobayashi, Nagao,Iwasa, Tatsuo,Tokiwa, Michio,Takeshita, Mitsuhiro,Maeda, Atushi,Hashimoto, Akihiko,Turuga, Kana,Nakano, Hiroto
, p. 7292 - 7300 (2015/11/25)
The catalytic activity of a simple amino alcohol that contains a bulky super silyl group [i.e., tris(trimethylsilyl)silyl (TTMSS)] bonded to the oxygen atom at the γ-position along with a primary amine moiety was examined in the enantioselective 1,3-dipolar cycloaddition of nitrones to α,β-unsaturated aldehydes. The organocatalyst successfully provided optically active isoxazolidines in good chemical yields (up to 86 %) with excellent diastereoselectivities (endo/exo, up to 96:4) and enantioselectivities (up to 97 % ee). Furthermore, the obtained isoxazolidines were easily converted into γ-amino diols that contain three contiguous stereogenic centers.
