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DOI: 10.1055/s-2007-983819
Synthesis of New Amino Acids with a 5-Imino-2,5-dihydro-3-furanyl Substituent at the Amino Group
Publikationsverlauf
Publikationsdatum:
30. Juli 2007 (online)
Abstract
Amino acids (glycine, β-alanine, γ-aminobutyric and ε-aminocapronic acids, d,l-valine, and d,l-leucine) react under biomimetic conditions (H2O, NaOH, pH ˜8.6-9.9, room temperature) smoothly with α,β-acetylenic γ-hydroxyacid nitriles to give a novel family of unnatural amino acids containing a 5-imino-2,5-dihydro-3-furanyl substituent at the amino group, in 61-98% yield. As follows from a single-crystal X-ray analysis of 2-[(5-imino-2,2-dimethyl-2,5-dihydro-3-furanyl)amino]acetic acid, the synthesized amino acids are zwitterions with a protonated imino group in the iminodihydrofuran moiety.
Key words
amino acids - acetylenes - nitriles - 2,5-dihydrofurans - nucleophilic addition
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References
Crystallographic data: monoclinic, space group C2/c, a = 20.712(4) Å, b = 9.194(2) Å, c = 10.712(2) Å, β = 120.52(3)°, V = 1757.2(6) Å3, Z = 8, Dcalcd = 1.39 g/cm3, reflections with [F 0 > 4σ(F 0)] = 1498, parameters refined = 167, R = 0.031. CCDC 628146 (for 11) contains the supplementary crystallographic data for this paper. These data can be obtained free of charge from The Cambridge Crystallographic Data Centre via www.ccdc.cam.ac.uk/data_request/cif