51
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Basuroy K, Dinesh B, Reddy MBM, Chandrappa S, Raghothama S, Shamala N, Balaram P. Unconstrained Homooligomeric γ-Peptides Show High Propensity for C14 Helix Formation. Org Lett 2013; 15:4866-9. [DOI: 10.1021/ol402248s] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Krishnayan Basuroy
- Molecular Biophysics Unit, Department of Physics, Sophisticated Instrumentation Facility, Indian Institute of Science, Bangalore 560 012, India
| | - Bhimareddy Dinesh
- Molecular Biophysics Unit, Department of Physics, Sophisticated Instrumentation Facility, Indian Institute of Science, Bangalore 560 012, India
| | - M. B. Madhusudana Reddy
- Molecular Biophysics Unit, Department of Physics, Sophisticated Instrumentation Facility, Indian Institute of Science, Bangalore 560 012, India
| | - Siddapa Chandrappa
- Molecular Biophysics Unit, Department of Physics, Sophisticated Instrumentation Facility, Indian Institute of Science, Bangalore 560 012, India
| | - Srinivasarao Raghothama
- Molecular Biophysics Unit, Department of Physics, Sophisticated Instrumentation Facility, Indian Institute of Science, Bangalore 560 012, India
| | - Narayanaswamy Shamala
- Molecular Biophysics Unit, Department of Physics, Sophisticated Instrumentation Facility, Indian Institute of Science, Bangalore 560 012, India
| | - Padmanabhan Balaram
- Molecular Biophysics Unit, Department of Physics, Sophisticated Instrumentation Facility, Indian Institute of Science, Bangalore 560 012, India
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52
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Dinesh B, Vinaya V, Raghothama S, Balaram P. C12-Helix Development in (αγ)nSequences - Spectroscopic Characterization of Boc-[Aib-γ4(R)Val]-OMe Oligomers. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300264] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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53
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Thorat VH, Ingole TS, Vijayadas KN, Nair RV, Kale SS, Ramesh VVE, Davis HC, Prabhakaran P, Gonnade RG, Gawade RL, Puranik VG, Rajamohanan PR, Sanjayan GJ. The Ant-Pro Reverse-Turn Motif. Structural Features and Conformational Characteristics. European J Org Chem 2013. [DOI: 10.1002/ejoc.201201739] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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54
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Basuroy K, Dinesh B, Shamala N, Balaram P. Promotion of Folding in Hybrid Peptides through Unconstrained γ Residues: Structural Characterization of Helices in (αγγ)nand (αγα)nSequences. Angew Chem Int Ed Engl 2013; 52:3136-9. [DOI: 10.1002/anie.201209324] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2012] [Indexed: 11/05/2022]
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55
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Basuroy K, Dinesh B, Shamala N, Balaram P. Promotion of Folding in Hybrid Peptides through Unconstrained γ Residues: Structural Characterization of Helices in (αγγ)nand (αγα)nSequences. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201209324] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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56
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Fremaux J, Dolain C, Kauffmann B, Clayden J, Guichard G. Influence of achiral units with gem-dimethyl substituents on the helical character of aliphatic oligourea foldamers. Chem Commun (Camb) 2013; 49:7415-7. [DOI: 10.1039/c3cc40961a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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57
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Jadhav SV, Gopi HN. Remarkable thermoresponsive nanofibers from γ-peptides. Chem Commun (Camb) 2013; 49:9179-81. [DOI: 10.1039/c3cc45383a] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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58
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Kumari H, Zhang J, Erra L, Barbour LJ, Deakyne CA, Atwood JL. Cocrystals of gabapentin with C-alkylresorcin[4]arenes. CrystEngComm 2013. [DOI: 10.1039/c3ce40441b] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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59
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Vijayadas KN, Nair RV, Gawade RL, Kotmale AS, Prabhakaran P, Gonnade RG, Puranik VG, Rajamohanan PR, Sanjayan GJ. Ester vs. amide on folding: a case study with a 2-residue synthetic peptide. Org Biomol Chem 2013; 11:8348-56. [DOI: 10.1039/c3ob41967c] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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60
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Baldauf C, Hofmann HJ. Ab initioMO Theory - An Important Tool in Foldamer Research: Prediction of Helices in Oligomers ofω-Amino Acids. Helv Chim Acta 2012. [DOI: 10.1002/hlca.201200436] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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61
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Legrand B, André C, Wenger E, Didierjean C, Averlant-Petit MC, Martinez J, Calmes M, Amblard M. Robust Helix Formation in a New Family of Oligoureas Based on a Constrained Bicyclic Building Block. Angew Chem Int Ed Engl 2012; 51:11267-70. [DOI: 10.1002/anie.201205842] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2012] [Indexed: 01/22/2023]
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62
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Legrand B, André C, Wenger E, Didierjean C, Averlant-Petit MC, Martinez J, Calmes M, Amblard M. Robust Helix Formation in a New Family of Oligoureas Based on a Constrained Bicyclic Building Block. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201205842] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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63
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Basuroy K, Dinesh B, Shamala N, Balaram P. Structural Characterization of Backbone-Expanded Helices in Hybrid Peptides: (αγ)n and (αβ)n Sequences with Unconstrained β and γ Homologues of L-Val. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201204436] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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64
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Basuroy K, Dinesh B, Shamala N, Balaram P. Structural Characterization of Backbone-Expanded Helices in Hybrid Peptides: (αγ)n and (αβ)n Sequences with Unconstrained β and γ Homologues of L-Val. Angew Chem Int Ed Engl 2012; 51:8736-9. [DOI: 10.1002/anie.201204436] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2012] [Indexed: 12/26/2022]
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65
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Dinesh B, Basuroy K, Shamala N, Balaram P. Structural characterization of folded pentapeptides containing centrally positioned β(R)Val, γ(R)Val and γ(S)Val residues. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.02.034] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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66
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Bandyopadhyay A, Gopi HN. Hybrid Peptides: Direct Transformation of α/α, β-Unsaturated γ-Hybrid Peptides to α/γ-Hybrid Peptide 12-Helices. Org Lett 2012; 14:2770-3. [DOI: 10.1021/ol300987d] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Anupam Bandyopadhyay
- Department of Chemistry, Indian Institute of Science Education and Research, Dr. Homi Bhabha Road, Pashan, Pune-411008, India
| | - Hosahudya N. Gopi
- Department of Chemistry, Indian Institute of Science Education and Research, Dr. Homi Bhabha Road, Pashan, Pune-411008, India
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67
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Basuroy K, Rajagopal A, Raghothama S, Shamala N, Balaram P. β-Turn analogues in model αβ-hybrid peptides: structural characterization of peptides containing β(2,2)Ac6c and β(3,3)Ac6c residues. Chem Asian J 2012; 7:1671-8. [PMID: 22555984 DOI: 10.1002/asia.201200052] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2012] [Indexed: 01/04/2023]
Abstract
The effect of gem-dialkyl substituents on the backbone conformations of β-amino acid residues in peptides has been investigated by using four model peptides: Boc-Xxx-β(2,2)Ac(6)c(1-aminomethylcyclohexanecarboxylic acid)-NHMe (Xxx = Leu (1), Phe (2); Boc = tert-butyloxycarbonyl) and Boc-Xxx-β(3,3)Ac(6)c(1-aminocyclohexaneacetic acid)-NHMe (Xxx = Leu (3), Phe (4)). Tetrasubstituted carbon atoms restrict the ranges of stereochemically allowed conformations about flanking single bonds. The crystal structure of Boc-Leu-β(2,2)Ac(6)c-NHMe (1) established a C(11) hydrogen-bonded turn in the αβ-hybrid sequence. The observed torsion angles (α(ϕ≈-60°, ψ≈-30°), β(ϕ≈-90°, θ≈60°, ψ≈-90°)) corresponded to a C(11) helical turn, which was a backbone-expanded analogue of the type III β turn in αα sequences. The crystal structure of the peptide Boc-Phe-β(3,3)Ac(6)c-NHMe (4) established a C(11) hydrogen-bonded turn with distinctly different backbone torsion angles (α(ϕ≈-60°, ψ≈120°), β(ϕ≈60°, θ≈60°, ψ≈-60°)), which corresponded to a backbone-expanded analogue of the type II β turn observed in αα sequences. In peptide 4, the two molecules in the asymmetric unit adopted backbone torsion angles of opposite signs. In one of the molecules, the Phe residue adopted an unfavorable backbone conformation, with the energetic penalty being offset by a favorable aromatic interaction between proximal molecules in the crystal. NMR spectroscopy studies provided evidence for the maintenance of folded structures in solution in these αβ-hybrid sequences.
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Affiliation(s)
- Krishnayan Basuroy
- Department of Physics, Indian Institute of Science, Bangalore-560 012, India
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68
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Practical preparation of enantiopure 2-methyl-azetidine-2-carboxylic acid; a γ-turn promoter. ACTA ACUST UNITED AC 2012. [DOI: 10.1016/j.tetasy.2012.05.006] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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69
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Koley P, Gayen A, Drew MGB, Mukhopadhyay C, Pramanik A. Design and self-assembly of a leucine-enkephalin analogue in different nanostructures: application of nanovesicles. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2012; 8:984-90. [PMID: 22323423 DOI: 10.1002/smll.201101685] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2011] [Revised: 11/01/2011] [Indexed: 05/19/2023]
Abstract
An opioid (leucine-enkephalin) conformational analogue forms diverse nanostructures such as vesicles, tubes, and organogels through self-assembly. The nanovesicles encapsulate the natural hydrophobic drug curcumin and allow the controlled release through cation-generated porogens in membrane mimetic solvent.
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Affiliation(s)
- Pradyot Koley
- Department of Chemistry, University of Calcutta, 92, A. P. C. Road, Kolkata-700 009, India
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70
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van der Knaap M, Otero JM, Llamas-Saiz A, van Raaij MJ, Lageveen LI, Busscher HJ, Grotenbreg GM, van der Marel GA, Overkleeft HS, Overhand M. Design, synthesis and structural analysis of mixed α/β-peptides that adopt stable cyclic hairpin-like conformations. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.01.015] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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71
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Bandyopadhyay A, Jadhav SV, Gopi HN. α/γ4-Hybrid peptide helices: synthesis, crystal conformations and analogy with the α-helix. Chem Commun (Camb) 2012; 48:7170-2. [DOI: 10.1039/c2cc32911e] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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72
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Priya G, Kotmale AS, Gawade RL, Mishra D, Pal S, Puranik VG, Rajamohanan PR, Sanjayan GJ. Helical folding in heterogeneous foldamers without inter-residual backbone hydrogen-bonding. Chem Commun (Camb) 2012; 48:8922-4. [DOI: 10.1039/c2cc33235c] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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73
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Vijayadas KN, Davis HC, Kotmale AS, Gawade RL, Puranik VG, Rajamohanan PR, Sanjayan GJ. An unusual conformational similarity of two peptide folds featuring sulfonamide and carboxamide on the backbone. Chem Commun (Camb) 2012; 48:9747-9. [DOI: 10.1039/c2cc34533a] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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74
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James WH, Buchanan EG, Guo L, Gellman SH, Zwier TS. Competition between Amide Stacking and Intramolecular H Bonds in γ-Peptide Derivatives: Controlling Nearest-Neighbor Preferences. J Phys Chem A 2011; 115:11960-70. [PMID: 21928850 DOI: 10.1021/jp2081319] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- William H. James
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907-2084, United States
| | - Evan G. Buchanan
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907-2084, United States
| | - Li Guo
- Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, United States
| | - Samuel H. Gellman
- Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, United States
| | - Timothy S. Zwier
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907-2084, United States
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75
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Mali SM, Bandyopadhyay A, Jadhav SV, Kumar MG, Gopi HN. Synthesis of α, β-unsaturated γ-amino esters with unprecedented high (E)-stereoselectivity and their conformational analysis in peptides. Org Biomol Chem 2011; 9:6566-74. [PMID: 21826295 DOI: 10.1039/c1ob05732d] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Mild, efficient and racemization-free synthesis of N-protected α, β-unsaturated γ-amino esters with unprecedented high E- stereoselectivity is described. This method is found to be compatible with Boc-, Fmoc- and other side chain protecting groups. The crystal conformations of the vinylogous γ-amino esters in monomers and in homo- and mixed dipeptides are studied. Further, the vinylogous homo-dipeptide showed a β-sheet conformation, while mixed α- and α,β-unsaturated γ-hybrid dipeptide adapted an irregular structure in single crystals.
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Affiliation(s)
- Sachitanand M Mali
- Department of Chemistry Indian Institute of Science Education and Research, Garware Circle Pashan, Pune, Maharashtra 411021, India
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76
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Guo L, Zhang W, Reidenbach AG, Giuliano MW, Guzei IA, Spencer LC, Gellman SH. Characteristic Structural Parameters for the γ-Peptide 14-Helix: Importance of Subunit Preorganization. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201101301] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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77
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Guo L, Zhang W, Reidenbach AG, Giuliano MW, Guzei IA, Spencer LC, Gellman SH. Characteristic structural parameters for the γ-peptide 14-helix: importance of subunit preorganization. Angew Chem Int Ed Engl 2011; 50:5843-6. [PMID: 21567680 DOI: 10.1002/anie.201101301] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2011] [Indexed: 11/09/2022]
Affiliation(s)
- Li Guo
- Department of Chemistry, University of Wisconsin, Madison, Madison, WI 53706, USA
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78
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Foldamers containing γ-amino acid residues or their analogues: structural features and applications. Amino Acids 2011; 41:687-707. [DOI: 10.1007/s00726-011-0893-3] [Citation(s) in RCA: 101] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2011] [Accepted: 03/18/2011] [Indexed: 12/21/2022]
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79
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Roy A, Prabhakaran P, Baruah PK, Sanjayan GJ. Diversifying the structural architecture of synthetic oligomers: the hetero foldamer approach. Chem Commun (Camb) 2011; 47:11593-611. [DOI: 10.1039/c1cc13313f] [Citation(s) in RCA: 106] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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80
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Moreno D, Cuevas JV, García-Herbosa G, Torroba T. A fluorescent molecular ruler as a selective probe for ω-aminoacids. Chem Commun (Camb) 2011; 47:3183-5. [DOI: 10.1039/c0cc05454b] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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81
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Balaram P. Hybrid polypeptides: Gabapentin as a stereochemically constrained γ-amino acid residue. Biopolymers 2010; 94:733-41. [DOI: 10.1002/bip.21468] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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82
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Vasudev PG, Chatterjee S, Shamala N, Balaram P. Structural Chemistry of Peptides Containing Backbone Expanded Amino Acid Residues: Conformational Features of β, γ, and Hybrid Peptides. Chem Rev 2010; 111:657-87. [DOI: 10.1021/cr100100x] [Citation(s) in RCA: 273] [Impact Index Per Article: 19.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Prema. G. Vasudev
- Department of Physics and Molecular Biophysics Unit, Indian Institute of Science, Bangalore 560012, India
| | - Sunanda Chatterjee
- Department of Physics and Molecular Biophysics Unit, Indian Institute of Science, Bangalore 560012, India
| | - Narayanaswamy Shamala
- Department of Physics and Molecular Biophysics Unit, Indian Institute of Science, Bangalore 560012, India
| | - Padmanabhan Balaram
- Department of Physics and Molecular Biophysics Unit, Indian Institute of Science, Bangalore 560012, India
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83
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Current World Literature. Curr Opin Anaesthesiol 2010; 23:532-8. [DOI: 10.1097/aco.0b013e32833c5ccf] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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84
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Fabbiani FPA, Levendis DC, Buth G, Kuhs WF, Shankland N, Sowa H. Searching for novel crystal forms by in situ high-pressure crystallisation: the example of gabapentin heptahydrate. CrystEngComm 2010. [DOI: 10.1039/b924573a] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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85
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Fischer L, Claudon P, Pendem N, Miclet E, Didierjean C, Ennifar E, Guichard G. The Canonical Helix of Urea Oligomers at Atomic Resolution: Insights Into Folding-Induced Axial Organization. Angew Chem Int Ed Engl 2009; 49:1067-70. [DOI: 10.1002/anie.200905592] [Citation(s) in RCA: 86] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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86
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Fischer L, Claudon P, Pendem N, Miclet E, Didierjean C, Ennifar E, Guichard G. The Canonical Helix of Urea Oligomers at Atomic Resolution: Insights Into Folding-Induced Axial Organization. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200905592] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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87
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Guo L, Chi Y, Almeida AM, Guzei IA, Parker BK, Gellman SH. Stereospecific synthesis of conformationally constrained gamma-amino acids: new foldamer building blocks that support helical secondary structure. J Am Chem Soc 2009; 131:16018-20. [PMID: 19886693 PMCID: PMC2843141 DOI: 10.1021/ja907233q] [Citation(s) in RCA: 124] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A highly stereoselective synthesis of novel cyclically constrained gamma-amino acid residues is presented. The key step involves organocatalytic Michael addition of an aldehyde to 1-nitrocyclohexene. After aldehyde reduction, this approach provides optically active beta-substituted delta-nitro alcohols (96-99% ee), which can be converted to gamma-amino acid residues with a variety of substituents at the alpha position. We have used these new building blocks to prepare alpha/gamma-peptide foldamers that adopt a specific helical conformation in solution and in the solid state.
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Affiliation(s)
- Li Guo
- Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706
| | - Yonggui Chi
- Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706
| | - Aaron M. Almeida
- Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706
| | - Ilia A. Guzei
- Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706
| | - Brian K. Parker
- Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706
| | - Samuel H. Gellman
- Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706
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