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Bergmann-Azlacton-Synthese
ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
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Die Bergmann-Azlacton-Synthese (auch als Bergmann-Stern-Azlacton-Synthese bekannt) ist eine Namensreaktion aus dem Bereich der Organischen Chemie. Die Reaktion wurde nach dem deutsch-US-amerikanischen Chemiker Max Bergmann (1886β1944) benannt und ist eine klassische Synthese zur Herstellung von Dipeptiden.cite-ref-1[1]cite-ref-steglich-hurnaus-2-0[2]
Contents
β’ Einzelnachweise
ββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ
Γbersichtsreaktion
Die Bergmann-Azlacton-Synthese dient der Herstellung von Peptiden 3, besonders Dipeptiden aus einem Azlacton 1 und einer AminosΓ€ure 2:cite-ref-steglich-hurnaus-2-1[2]
Reaktionsmechanismus
Durch die Reaktion des Azlactons 1 mit der AminosΓ€ure 2 ΓΆffnet sich der Ring des Azlactons. Dabei bildet sich ein acyliertes ungesΓ€ttigtes Dipeptid 4, welches durch katalytische Hydrierung zum gesΓ€ttigten Dipeptid 5 umgesetzt wird. Durch anschlieΓende katalytische Abspaltung von EssigsΓ€ure entsteht das Dipeptid 3.cite-ref-3[3]cite-ref-4[4]
Einzelnachweise
cite-note-steglich-hurnaus-22. β Wolfgang Steglich, Rudolf Hurnaus: Γber den Verlauf der Bergmann-Sternschen Azlactonsynthese; 2-Alkyliden-pseudooxazolone-(5), Tetrahedron Lett., 1966, 383, doi: 10.1016/S0040-4039(00)72951-0.
cite-note-33. β J. PlΓΆchl: Ueber PhenylglycidasΓ€ure (PhenyloxacrylsΓ€ure), Berichte der Deutschen Chemischen Gesellschaft, 1883, 16, 2815, doi: 10.1002/cber.188301602235.
cite-note-44. β J. S. Fruton, Advan. Protein Chem. V, 15 (1949); S. Archer in Amino Acids and Proteins, D. M. Greenberg, Ed. (Thomas, Springfield, IL, 1951), S. 181; H. D. Springall, The Structural Chemistry of Proteins (New York, 1954) S. 29; E. Baltazzi, Quart. Rev. (London) 10, 235 (1956). Cf.