- Protecting-Group-Free Amidation of Amino Acids using Lewis Acid Catalysts
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Amidation of unprotected amino acids has been investigated using a variety of ‘classical“ coupling reagents, stoichiometric or catalytic group(IV) metal salts, and boron Lewis acids. The scope of the reaction was explored through the attempted synthesis of amides derived from twenty natural, and several unnatural, amino acids, as well as a wide selection of primary and secondary amines. The study also examines the synthesis of medicinally relevant compounds, and the scalability of this direct amidation approach. Finally, we provide insight into the chemoselectivity observed in these reactions.
- Sabatini, Marco T.,Karaluka, Valerija,Lanigan, Rachel M.,Boulton, Lee T.,Badland, Matthew,Sheppard, Tom D.
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supporting information
p. 7033 - 7043
(2018/05/04)
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- Studies on the application of the Passerini reaction and enzymatic procedures to the synthesis of tripeptide mimetics
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A new, efficient method for the multicomponent synthesis of tripeptide mimetics is presented. Simple, chemoenzymatic transformations of Passerini reaction products enable the introduction of varied amino acid moieties into the tripeptide scaffold, with co
- Szymanski, Wiktor,Zwolinska, Magdalena,Ostaszewski, Ryszard
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p. 7647 - 7653
(2008/02/08)
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- Multicomponent diversity and enzymatic enantioselectivity as a route towards both enantiomers of α-amino acids-a model study
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A model study on a new, enantioconvergent method for the synthesis of chiral, nonracemic α-amino acids is presented. α-Acetoxyamides obtained in a Passerini multicomponent reaction are selectively hydrolyzed by Wheat Germ lipase. Studies on conversion of the thus obtained, enantiomerically enriched α-hydroxyamides into α-aminoamides are presented. Products of these reactions are then hydrolyzed to give α-amino acids.
- Szymanski, Wiktor,Ostaszewski, Ryszard
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p. 2667 - 2671
(2007/10/03)
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