- Data mining of amine dehydrogenases for the synthesis of enantiopure amino alcohols
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Chiral amino alcohols are essential building blocks for the pharmaceutical industry, and are widely present in natural and synthetic bioactive compounds. Amine dehydrogenases (AmDHs) can asymmetrically reduce prochiral ketones with low-cost ammonia to chiral amines and water as by-products, using NAD(P)H as a cofactor under mild conditions, but hydroxy ketones with formation of chiral hydroxy amines have rarely been investigated. In this study, six new bacterial AmDHs derived from amino acid dehydrogenases (AADHs) were identified by data mining, and five out of the six enzymes were able to efficiently reduce 1-hydroxybutan-2-one (1a) to (S)-2-aminobutan-1-ol ((S)-2a) with 19-99% conversions and 99% ee. The five AmDHs were purified and biochemically characterized for reductive amination activity towards substrate 1a with the optimal pH at 8.5 or 9.0 and the optimal temperature at 45 °C, 50 °C or 55 °C, and provided reductive amination of a broad range of prochiral α-hydroxy ketones, and even of a model β-hydroxy ketone leading to β-hydroxy amine with 99% ee. Our study expands the toolbox of AmDHs in the synthesis of chiral amino alcohols.
- Guo, Jinggong,Li, Jun-Kuan,Ma, Jun-An,Miao, Yuchen,Qu, Ge,Sun, Zhoutong,Wang, Hongyue
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p. 5945 - 5952
(2020/10/08)
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- Enantioselective Synthesis of Chiral Vicinal Amino Alcohols Using Amine Dehydrogenases
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Chiral vicinal amino alcohols are an important motif found in many biologically active molecules. In this study, biocatalytic reductive amination of α-hydroxy ketones with ammonia was investigated using engineered amine dehydrogenases (AmDHs) derived from the leucine amino acid dehydrogenase (AADH) from Lysinibacillus fusiformis. The AmDHs thus identified enabled the synthesis of (S)-configured vicinal amino alcohols from the corresponding α-hydroxy ketones in up to 99% conversions and >99% ee. One of the AmDH variants was used to prepare a key intermediate for the antituberculosis pharmaceutical ethambutol.
- Chen, Fei-Fei,Cosgrove, Sebastian C.,Birmingham, William R.,Mangas-Sanchez, Juan,Citoler, Joan,Thompson, Matthew P.,Zheng, Gao-Wei,Xu, Jian-He,Turner, Nicholas J.
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p. 11813 - 11818
(2019/12/02)
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- Palladium-N-heterocyclic carbene (NHC)-catalyzed asymmetric synthesis of indolines through regiodivergent C(sp3)-H activation: Scope and DFT study
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Two bulky, chiral, monodentate N-heterocyclic carbene ligands were applied to palladium-catalyzed asymmetric C-H arylation to incorporate C(sp3)-H bond activation. Racemic mixtures of the carbamate starting materials underwent regiodivergent reactions to afford different trans-2,3- substituted indolines. Although this CAr-Calkyl coupling requires high temperatures (140-160°C), chiral induction is high. This regiodivergent reaction, when carried out with enantiopure starting materials, can lead to single structurally different enantiopure products, depending on the catalyst chirality. The C-H activation at a tertiary center was realized only in the case of a cyclopropyl group. No C-H activation takes place alpha to a tertiary center. A detailed DFT study is included and analyses of methyl versus methylene versus methine C-H activation is used to rationalize experimentally observed regio- and enantioselectivities.
- Katayev, Dmitry,Larionov, Evgeny,Nakanishi, Masafumi,Besnard, Cline,Kündig, E. Peter
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supporting information
p. 15021 - 15030
(2015/02/19)
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- Synthesis of imidacloprid derivatives with a chiral alkylated imidazolidine ring and evaluation of their insecticidal activity and affinity to the nicotinic acetylcholine receptor
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A series of imidacloprid (IMI) derivatives with an alkylated imidazolidine ring were asymmetrically synthesized to evaluate their insecticidal activity against adult female housefly, Musca domestica, and affinity to the nicotinic acetylcholine receptor of the flies. The bulkier the alkyl group, the lower was the receptor affinity, but the derivatives methylated and ethylated at the R-5-position of the imidazolidine ring were equipotent to the unsubstituted compound. Quantitative structure-activity relationship (QSAR) analysis of the receptor affinity demonstrated that the introduction of a substituent into the imidazolidine ring was fundamentally disadvantageous, but the introduction of a substituent at the R-5-position was permissible in the case of its small size. The binding model of the synthesized derivatives with the receptor supported the QSAR analysis, indicating the existence of space for a short alkyl group around the R-5-position in the ligand-binding site. In addition, positive correlation was observed between the insecticidal activity and receptor affinity, suggesting that the receptor affinity was the primary factor in influencing the insecticidal activity even if the imidazolidine ring was modified.
- Nishiwaki, Hisashi,Kuriyama, Mituhiro,Nagaoka, Hikaru,Kato, Akira,Yamauchi, Satoshi,Shuto, Yoshihiro,Akamatsu, Miki
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p. 6305 - 6312,8
(2012/12/11)
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- COMPOSITIONS AND METHODS FOR CYCLOFRUCTANS AS SEPARATION AGENTS
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The present invention relates to derivatized cyclofructan compounds, compositions comprising derivatized cyclofructan compounds, and methods of using compositions comprising derivatized cyclofructan compounds for chromatographic separations of chemical species, including enantiomers. Said compositions may comprise a solid support and/or polymers comprising derivatized cyclofructan compounds.
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Page/Page column 45-49; 59
(2010/12/31)
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- Efficient synthesis of functionalized aziridinium salts
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(Chemical Equation Presented) Various aziridinium salts were efficiently prepared from bromination of a series of backbone substituted N,N-bisubstituted β-amino alcohols and isolated via flash column chromatography. The effect of C-substitution, N-substitution, solvent, leaving group, and counter-anions on formation of the isolable aziridinium salts was investigated. 2009 American Chemical Society.
- Chong, Hyun-Soon,Song, Hyun A.,Dadwal, Mamta,Sun, Xiang,Sin, Inseok,Chen, Yunwei
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supporting information; experimental part
p. 219 - 221
(2010/04/24)
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- Enantioselective synthesis and absolute configuration of (-)-1-(benzofuran-2-yl)-2-propylaminopentane, ((-)-BPAP), a highly potent and selective catecholaminergic activity enhancer
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Enantioselective synthesis and absolute configuration of (-)-1-(benzofuran-2-yl)-2-propylaminopentane ((-)-BPAP), which is a highly potent and selective catecholaminergic activity enhancer (CAE) substance, are described. The synthetic approach consists of the coupling reaction of benzofuran with (R)-N-tosyl-2-propylazirizine or (R)-N-methoxy-N-methylnorvaliamide, followed by appropriate modifications of the resulting coupling products. As the results, (-)-BPAP turned out to have the R configuration, which was finally confirmed by X-ray crystallographic analysis.
- Oka, Takahiro,Yasusa, Takuya,Ando, Takashi,Watanabe, Mayumi,Yoneda, Fumio,Ishida, Toshimasa,Knoll, Joseph
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p. 1213 - 1219
(2007/10/03)
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- Synthesis of macrocyclic insect-derived alkaloids
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Macrocyclic lactonic alkaloids found in the pupal secretions of two species of a coccinellid beetle (genus Epilachna) were prepared in enantiomerically pure form via an efficient synthetic route using enantiomerically pure α-amino acids as chiral-pool starting materials. Macrocycles with rings containing up to 98 atoms were synthesized in good yield using Mukaiyama's macrolactonization conditions.
- Farmer, Jay J.,Schroeder, Frank C.,Meinwald, Jerrold
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p. 2594 - 2606
(2007/10/03)
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- A highly efficient synthesis of (S)-(+)-N-Boc-coniine using ring- closing olefin metathesis (RCM)
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Optically active (S)-(+)-coniine as an N-Boc protected form was concisely prepared starting from an amino acid, L-norvaline. The key step involved a ring-closing olefin metathesis (RCM) of the dialkenyl compound 6 to give the corresponding cyclic olefin 8 in an essentially quantitative yield.
- Jo, Eunyoung,Na, Youngim,Chang, Sukbok
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p. 5581 - 5582
(2007/10/03)
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- Aldehyde derivatives and their use as calpain inhibitors
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Aldehyde derivatives with a specific calpain inhibiting activity and a platelet-aggregation inhibiting effect with formula (I) or formula (II): wherein R1 represents an aromatic hydrocarbon group, a heterocyclic group, or a group of-X-R3 in which X represents O,-S(O)m-(m = 0, 1, or 2), and R3 represents an aromatic hydrocarbon group, a heterocyclic group, or an alkyl group; Z represents R?-Y-or R?O-CH(R?)-in which Y represents a 3-to 7-membered nitrogen-containing saturated heterocyclic group, or a single cyclic saturated hydrocarbon group, R? represents an alkyl group, an alkenyl group, an alkynyl group, an acyl group, a sulfonyl group, an alkoxycarbonyl group, a carbamoyl group, or a thiocarbamoyl group, R? represents hydrogen, an alkyl group, or an aromatic hydrocarbon group, and R? represents an acyl group, a carbamoyl group, a thiocarbamoyl group, or an alkyl group; and n is an integer of 1 to 5. wherein R?, R?, R?, and R1? are defined in the specification.
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- Lipase-catalysed Enantioselective Acylation of N-Protected or Unprotected 2-Aminoalkan-1-ols
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Porcine pancreatic lipase (PPL) catalysed the acylation of 2-aminoalkan-1-ols; the enantiospecificity depends on the starting amino alcohol.The catalytic activity of the enzyme was markedly improved when the benzyl carbamate derivatives were used as substrates; in general, the enzyme displayed a high enantiospecificity.
- Fernandez, Susana,Brieva, Rosario,Rebolledo, Francisca,Gotor, Vicente
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p. 2885 - 2890
(2007/10/02)
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- Enantiomeric effects of homologues of disoxaril on the inhibitory activity against human rhinovirus-14
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X-ray crystallography studies of racemic 5-[7-[4-(4,5-dihydro-4-methyl-2-oxazolyl)phenoxy]heptyl]-3-methyl isoxazole (2) bound to human rhinovirus-14 (HRV-14) indicate selective binding of the S isomer. This result correlates well with the 10-fold greater
- Diana,Otto,Treasurywala,McKinlay,Oglesby,Maliski,Rossmann,Smith
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p. 540 - 544
(2007/10/02)
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- SYNTHESIS OF THE RACEMIC FORM OF (Z)-1,17-DIAMINOOCTADEC-9-ENE, AN ALIPHATIC DIAMINE FROM COCCINELLIDAE. DETERMINATION OF THE ABSOLUTE CONFIGURATION OF THE (+)-NATURALLY-OCCURRING ANTIPODE
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The total synthesis of the title compound (1) has been achieved.Also reported is the use of lanthanide induced shifts in 1H NMR spectroscopy to assign the absolute configuration of the α-carbon atom in chiral primary α-methylalkylamines.Application of this empirical method to natural (+)-1 shows that it has the R-configuration at C-17.
- Braconnier, M.F.,Braekman, J.C.,Daloze, D.
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p. 605 - 614
(2007/10/02)
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- Use of Liquid Crystal Induced Circular Dichroism for Absolute Configurational Assignments of β-Amino Alcohols
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Dissolution of small quantities of chiral β-amino alcohols in liquid crystalline N-(p-methoxybenzylidene)-p-n-butylaniline (MBBA) results in induced rotations due to the formation of a cholesteric (chiral) liquid crystal phase.The induced rotations are several orders of magnitude larger than those observed for β-amino alcohols in isotropic solutions, and the signs of these rotations can be correlated with the absolute configurations of the chiral amino alcohols when standard conformational analysis arguments and the preference of elongated molecules to align with MBBA are considered.
- Rinaldi, Peter L.,Wilk, Melody
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p. 2141 - 2146
(2007/10/02)
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