Cyclopenta[ d ]isoxazoline β-Turn Mimics: Synthetic Approach, Turn Driving Force, Scope, and Limitations.

Autor:	Memeo MG; Dipartimento di Chimica, Università degli Studi di Pavia, Viale Taramelli 12, 27100 Pavia, Italy., Bruschi M; Dipartimento di Chimica, Università degli Studi di Pavia, Viale Taramelli 12, 27100 Pavia, Italy., Bergonzi L; Dipartimento di Chimica, Università degli Studi di Pavia, Viale Taramelli 12, 27100 Pavia, Italy., Desimoni G; Dipartimento di Chimica, Università degli Studi di Pavia, Viale Taramelli 12, 27100 Pavia, Italy., Faita G; Dipartimento di Chimica, Università degli Studi di Pavia, Viale Taramelli 12, 27100 Pavia, Italy., Quadrelli P; Dipartimento di Chimica, Università degli Studi di Pavia, Viale Taramelli 12, 27100 Pavia, Italy.
Jazyk:	angličtina
Zdroj:	ACS omega [ACS Omega] 2018 Oct 18; Vol. 3 (10), pp. 13551-13558. Date of Electronic Publication: 2018 Oct 18 (Print Publication: 2018).
DOI:	10.1021/acsomega.8b01670
Abstrakt:	Model β-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 β-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. Competing Interests: The authors declare no competing financial interest.
Databáze:	MEDLINE
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