2799-86-2Relevant academic research and scientific papers
Chemoenzymatic aminolysis and ammonolysis of β-ketoesters
Garcia, Maria Jesus,Rebolledo, Francisca,Gotor, Vicente
, p. 6141 - 6142 (1993)
Candida antarctica lipase efficiently catalyses the preparation of β-ketoamides from β-ketoesters with primary aliphatic amines and ammonia.
Efficient synthesis of α-alkyl-β-amino amides by transaminase-mediated dynamic kinetic resolutions
Mourelle-Insua, ángela,Méndez-Sánchez, Daniel,Galman, James L.,Slabu, Iustina,Turner, Nicholas J.,Gotor-Fernández, Vicente,Lavandera, Iván
, p. 4083 - 4090 (2019/08/07)
The biocatalytic stereocontrolled synthesis of various acyclic anti- or syn-α-alkyl-β-amino amides through a dynamic kinetic resolution strategy is demonstrated. A series of commercially available and in-house transaminases (TAs) were employed to perform the transamination of a series of chemically synthesized racemic α-alkyl-β-keto amides. Among them, commercial (R)-selective TAs showed the best activities and selectivities, giving access preferentially to the anti-diastereoisomers with low to high diastereomeric ratios (up to 96%) and excellent enantiomeric excess (>99%). The stereoselective biotransamination experiments were successfully demonstrated at a semi-preparative scale (25 mM, 100 mg substrate), leading to the corresponding optically active α-alkyl-β-amino amides in 45-90% isolated yields after a simple liquid-liquid extraction protocol.
Highly Diastereo- and Enantioselective Synthesis of α-Spiro-δ-lactams by an Organocascade Reaction
Zhang, Kaiheng,Meazza, Marta,Do?ekal, Vojtěch,Light, Mark E.,Vesely, Jan,Rios, Ramon
supporting information, p. 1749 - 1756 (2017/04/13)
An asymmetric synthesis of α-spiro-δ-lactams by an organocascade reaction of easily accessible starting materials has been accomplished. The catalytic sequence begins with enantioselective Michael addition of a β-ketoamide to an α,β-unsaturated aldehyde,
GABA-analogous spirocyclic amino acid esters, 5. n-benzyl-7-azaspiro[4.5]decane-l-carboxylates
Bendl, Markus,Eder, Michael,Langhammer, Ingo,Urban, Ernst
, p. 115 - 126 (2007/10/03)
N-Benzyl-7-azaspiro[4.5]decane-1-carboxylates (4a and 4b) were prepared in a seven step synthesis starting from ethyl cyclopentanonecarboxylate (5). Aminolysis of the β-keto ester (5) with benzylamine led to the β-keto amide (9) which gave the a-substitut
Lipase-catalyzed aminolysis and ammonolysis of β-ketoesters. Synthesis of optically active β-ketoamides.
Garcia,Rebolledo,Gotor
, p. 6935 - 6940 (2007/10/02)
Aminolysis and ammonolysis reactions of β-ketoesters catalyzed by Candida antarctica lipase are very efficient methods for the preparation of β- ketoamides. When racemic amines are used in these processes, the corresponding optically active β-ketoamides are obtained with moderate-high enantiomeric excesses.
Dehydrogenations with lead tetraacetate. Ketone to enone transformations in the 2-(aminocarbonyl)- and 2-(carbalkoxy)cycloalkanone series
Schultz, Arthur G.,Holoboski, Mark A.
, p. 3021 - 3024 (2007/10/02)
Cyclic β-ketoesters and β-ketoamides are converted to 2-(carbalkoxy)- and 2-(aminocarbonyl)-2-cycloalken-1-ones by treatment with Pb(OAc)4 and Cu(OAc)2 in benzene.
