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Showing 1-14 of 14 results for "269107" within Papers
Shu-Lai Liu et al.
Bioprocess and biosystems engineering, 28(5), 285-289 (2005-10-26)
Penicillin G acylase (PGA) from Kluyvera citrophila immobilized on Amberzyml was used for enantioselective hydrolysis of N-phenylacetylated-DL-tert-leucine (N-Phac-DL-Tle) to produce L-tert-leucine (L-Tle). The effects of various organic cosolvents on hydrolysis of N-Phac-DL-Tle have been investigated in aqueous-cosolvent medium. It was
Preparation of (S)?tert?Butyl PHOX: (Oxazole, 4?(1, 1?Dimethylethyl)?2?[2?(Diphenylphosphino) Phenyl]?4, 5?Dihydro?(4S)?).
Krout M R, et al.
Organic Syntheses, 86, 181-193 (2003)
K Laumen et al.
Bioscience, biotechnology, and biochemistry, 65(9), 1977-1980 (2001-10-26)
Optically pure D-tert.-leucine was obtained by the enzymatic hydrolysis of (+/-)-N-acetyl-tert. leucine chloroethyl ester after about 50% conversion, this being catalyzed by a protease from Bacillus licheniformis (Alcalase), and subsequent acidic saponification of the recovered ester. Among the methyl, ethyl
Yingchao Zhang et al.
Organic letters, 6(1), 23-25 (2004-01-03)
[reaction: see text] A highly diastereoselective acetate aldol reaction that uses a tert-leucine-derived thiazolidinethione auxiliary and dichlorophenylborane has been developed. The reaction proceeds in excellent yields and with high diastereoselectivities (drs range from 9.5:1 to >100:1).
Use of unprotected amino acids in metal-free tandem radical cyclization reactions: divergent synthesis of 6-alkyl/acyl phenanthridines.
Lu S C, et al.
Royal Society of Chemistry Advances, 7(88), 55891-55896 (2017)
Philippe Bisel et al.
Organic & biomolecular chemistry, 6(15), 2655-2665 (2008-07-18)
The unique reactivity pattern elicited by the crowded tert-butyl group is highlighted by summarising characteristic applications. Starting from the use of this simple hydrocarbon moiety in chemical transformations, via its relevance in Nature and its implication in biosynthetic and biodegradation
Synthesis, structure and application of chiral copper (II) coordination polymers for asymmetric acylation.
Jammi S, et al.
Inorganic Chemistry, 47(12), 5093-5098 (2008)
Fernando Formaggio et al.
Chemistry (Weinheim an der Bergstrasse, Germany), 11(8), 2395-2404 (2005-01-26)
Terminally protected homopeptides of tert-leucine, from the dimer to the hexamer, co-oligopeptides of tert-leucine in combination with alpha-aminoisobutyric acid or glycine residues up to the hexamer level, and simple dipeptides representing known scaffolds for catalysts in asymmetric organic reactions were
Tridentate ligands derived from L-tert-Leucine for the Cu (II) mediated asymmetric Henry reaction
Korkmaz N, et al.
Turkish Journal of Chemistry, 35, 361-374 (2011)
Wenbin Wu et al.
Chemical communications (Cambridge, England), 48(73), 9180-9182 (2012-08-07)
A diamine-catalyzed asymmetric tandem reaction between α,β-unsaturated ketones and rhodanine derivatives has been developed to synthesize various spirocyclic compounds with high stereoselectivities (up to 99% ee and >20:1 dr). The products obtained contain two pharmaceutically relevant features: the biologically active
Highly Selective Asymmetric Acetate Aldol Reactions of an N-Acetyl Thiazolidinethione Reagent.
Zhang Y, et al.
Organic Letters, 6(1), 23-25 (2004)
Stephan J Zuend et al.
Nature, 461(7266), 968-970 (2009-10-16)
Alpha-amino acids are the building blocks of proteins and are widely used as components of medicinally active molecules and chiral catalysts. Efficient chemo-enzymatic methods for the synthesis of enantioenriched alpha-amino acids have been developed, but it is still a challenge
Stabilizing and destabilizing effects of placing beta-branched amino acids in protein alpha-helices.
V W Cornish et al.
Biochemistry, 33(40), 12022-12031 (1994-10-11)
In order to gain greater insight into the effects of beta-branched amino acids on protein alpha-helices, hydrophobic amino acids with varying degrees of beta-branching, including the fully beta-substituted L-2-amino-3,3-dimethylbutanoic acid (ADBA), were incorporated into the protein T4 lysozyme. The unnatural
Werner Hummel et al.
Organic letters, 5(20), 3649-3650 (2003-09-26)
[reaction: see text] d-tert-Leucine was prepared with an enantiomeric excess of >99% by an enzyme-catalyzed oxidative resolution of the racemic mixture of dl-tert-leucine with use of leucine dehydrogenase. The l-amino acid was oxidized completely due to coupling of the primary
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