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Cyclopenta[d]isoxazoline β-Turn Mimics: Synthetic Approach, Turn Driving Force, Scope, and Limitations
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DOI：10.1021/acsomega.8b01670.png)
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Abstract
En 中文
Model beta-turn inducers were prepared from constrained oxazanorbornene aminols. Taking advantage of the starting materials geometry, new diastereoisomeric compounds were synthesized, introducing different amino acidic residues. The products were spectroscopically characterized (VT and NMR titration). Temperature coefficients in dimethyl sulfoxide denote the existence of an intramolecular hydrogen bond. Chiroptical properties disclosed a beta-turn arrangement of the synthesized compounds. The fused isoxazoline ring constraints the cyclopentane moiety, stabilizing a boatlike conformation that ensures the turn efficiency but limiting the accessibility to hindered amino acids.
Keywords:
CONFORMATIONAL-ANALYSIS
AMINO-ACID
CIRCULAR-DICHROISM
CONVENIENT ENTRY
NITRILE OXIDES
PEPTIDES
DESIGN
HELICES
SHEETS
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