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Chhikara BS, Rao MS, Rao VK, Kumar A, Buckheit KW, Buckheit Jr. RW, Parang K. Carbocyclodipeptides as modified nucleosides: synthesis and anti-HIV activities. CAN J CHEM 2014; 92:1145-1149. [DOI: 10.1139/cjc-2014-0356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/09/2024]
Abstract
A new class of nucleoside analogues were synthesized using cyclic dipeptides and modified 2′-deoxyfuranoribose sugars to introduce flexibility by peptides in place of common nucleoside bases and to determine their biological properties. The synthesis was carried out by coupling of a protected ribose sugar with synthesized dipeptides in the presence of hexamethyldisilazane and trimethylsilyltriflate. The final products were characterized by NMR and high-resolution MS-TOF spectroscopy. The compounds were evaluated for anti-HIV activities. 1-(4-Azido-5-(hydroxymethyl)tetrahydrofuran-2-yl)-3,6-diisopropylpiperazine-2,5-dione (compound 14) containing 3- and 6-isopropyl groups in the base and 3′-azide (EC50 = 1.96 μmol/L) was the most potent compound among all of the synthesized analogs.
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Affiliation(s)
- Bhupender S. Chhikara
- Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, 7 Greenhouse Road, Kingston, RI 02881, USA
| | - M. Sudershan Rao
- Department of Chemistry, Birla Institute of Technology and Science, Pilani 333031 Rajasthan, India
| | - V. Kameshwara Rao
- Department of Chemistry, Birla Institute of Technology and Science, Pilani 333031 Rajasthan, India
| | - Anil Kumar
- Department of Chemistry, Birla Institute of Technology and Science, Pilani 333031 Rajasthan, India
| | - Karen W. Buckheit
- ImQuest BioSciences Inc., 7340 Executive Way, Suite R, Frederick, MD 21704, USA
| | | | - Keykavous Parang
- Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, University of Rhode Island, 7 Greenhouse Road, Kingston, RI 02881, USA
- Department of Chemistry, Birla Institute of Technology and Science, Pilani 333031 Rajasthan, India
- Chapman University School of Pharmacy, Harry and Diane Rinker Health Science Campus, 9401 Jeronimo Road, Irvine, CA 92618, USA
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González A, Vorob́eva SL, Linares A. Synthesis and structural study of piperazine-2,5-diones derived from (R)-cysteine. ACTA ACUST UNITED AC 1995. [DOI: 10.1016/0957-4166(95)00168-o] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Pinnen F, Luisi G, Calcagni A, Lucente G, Gavuzzo E, Cerrini S. Approaches to pseudopeptidic ergopeptines. Part 2. Consequences of the incorporation of an α-azaproline residue into the oxacyclolic system. ACTA ACUST UNITED AC 1994. [DOI: 10.1039/p19940001611] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Calcagni A, Gavuzzo E, Lucente G, Mazza F, Pochetti G, Rossi D. Structure and conformation of peptides containing the sulphonamide junction. I. N-acetyl-tauryl-L-phenylalanine methyl ester. INTERNATIONAL JOURNAL OF PEPTIDE AND PROTEIN RESEARCH 1989; 34:319-24. [PMID: 2599772 DOI: 10.1111/j.1399-3011.1989.tb01581.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
N-acetyl-tauryl-L-phenylalanine methyl ester 1 has been synthesized. The crystal structure and molecular conformation of 1 have been determined. Crystals are monoclinic, space group P2(1) with a = 5.088(2), b = 17.112(17), c = 9.581(6) A, beta = 92.34(4) degrees, Z = 2. The structure has been solved by direct methods and refined to R = 0.043 for 2279 reflections with I greater than 1.5 sigma(I). The sulphonamide junction maintains the peptide backbone folded with Tau and Phe C alpha atoms in a cisoidal arrangement, the torsion angle around the S-N bond being 65.4 degrees. In this conformation the p-orbital of the sulphonamide nitrogen lies in the region of the plane bisecting the O-S-O angle, thus favouring d pi-p pi interactions between nitrogen and sulphur atoms. The S-N bond with a length of 1.618 A has significant pi-bond character. The CO-NH is planar and adopts trans conformation. The Tau residue is extended with the Tau-C1 alpha-Ca beta bond anti-periplanar to the S-N bond. The Phe side chain conformation corresponds to the statistically most favoured g- rotamer and exhibits a chi 1 torsion angle of -67.5 degrees. The packing is characterized by intermolecular H-bonds which the Tau and Phe NH groups form with the acetyl carbonyl and one of the two sulphonamide oxygens, respectively.
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Affiliation(s)
- A Calcagni
- Department of Pharmaceutical Studies, University La Sapienza, Rome, Italy
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