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Martín-Gago P, Aragón E, Gomez-Caminals M, Fernández-Carneado J, Ramón R, Martin-Malpartida P, Verdaguer X, López-Ruiz P, Colás B, Cortes MA, Ponsati B, Macias MJ, Riera A. Insights into structure-activity relationships of somatostatin analogs containing mesitylalanine. Molecules 2013; 18:14564-84. [PMID: 24287991 PMCID: PMC6270305 DOI: 10.3390/molecules181214564] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2013] [Revised: 11/12/2013] [Accepted: 11/13/2013] [Indexed: 12/29/2022] Open
Abstract
The non-natural amino acid mesitylalanine (2,4,6-trimethyl-L-phenylalanine; Msa) has an electron-richer and a more conformationally restricted side-chain than that of its natural phenylalanine counterpart. Taking these properties into account, we have synthesized ten somatostatin analogs containing Msa residues in different key positions to modify the intrinsic conformational flexibility of the natural hormone. We have measured the binding affinity of these analogs and correlated it with the main conformations they populate in solution. NMR and computational analysis revealed that analogs containing one Msa residue were conformationally more restricted than somatostatin under similar experimental conditions. Furthermore, we were able to characterize the presence of a hairpin at the pharmacophore region and a non-covalent interaction between aromatic residues 6 and 11. In all cases, the inclusion of a D-Trp in the eighth position further stabilized the main conformation. Some of these peptides bound selectively to one or two somatostatin receptors with similar or even higher affinity than the natural hormone. However, we also found that multiple incorporations of Msa residues increased the life span of the peptides in serum but with a loss of conformational rigidity and binding affinity.
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Affiliation(s)
- Pablo Martín-Gago
- Institute for Research in Biomedicine (IRB Barcelona) Baldiri Reixac, 10, Barcelona 08028, Spain; E-Mails: (P.M.-G.); (E.A.); (R.R.); (P.M.-M.); (X.V.)
| | - Eric Aragón
- Institute for Research in Biomedicine (IRB Barcelona) Baldiri Reixac, 10, Barcelona 08028, Spain; E-Mails: (P.M.-G.); (E.A.); (R.R.); (P.M.-M.); (X.V.)
| | - Marc Gomez-Caminals
- BCN Peptides S.A. Pol.Ind. Els Vinyets-Els Fogars, Sector II. Ctra. Comarcal 244, Km. 22, 08777 Sant Quintí de Mediona, Barcelona 08777, Spain; E-Mails: (M.G.-C.); (J.F.-C.); (B.P.)
| | - Jimena Fernández-Carneado
- BCN Peptides S.A. Pol.Ind. Els Vinyets-Els Fogars, Sector II. Ctra. Comarcal 244, Km. 22, 08777 Sant Quintí de Mediona, Barcelona 08777, Spain; E-Mails: (M.G.-C.); (J.F.-C.); (B.P.)
| | - Rosario Ramón
- Institute for Research in Biomedicine (IRB Barcelona) Baldiri Reixac, 10, Barcelona 08028, Spain; E-Mails: (P.M.-G.); (E.A.); (R.R.); (P.M.-M.); (X.V.)
- Departament de Química Orgànica, Universitat de Barcelona, Martí i Franqués, 1-11, Barcelona 08028, Spain
| | - Pau Martin-Malpartida
- Institute for Research in Biomedicine (IRB Barcelona) Baldiri Reixac, 10, Barcelona 08028, Spain; E-Mails: (P.M.-G.); (E.A.); (R.R.); (P.M.-M.); (X.V.)
| | - Xavier Verdaguer
- Institute for Research in Biomedicine (IRB Barcelona) Baldiri Reixac, 10, Barcelona 08028, Spain; E-Mails: (P.M.-G.); (E.A.); (R.R.); (P.M.-M.); (X.V.)
- Departament de Química Orgànica, Universitat de Barcelona, Martí i Franqués, 1-11, Barcelona 08028, Spain
| | - Pilar López-Ruiz
- Departamento de Bioquímica y Biología Molecular, Universidad de Alcalá de Henares, Facultad de Medicina, Madrid 28871, Spain; E-Mails: (P.L.-R.); (B.C.); (M.A.C.)
| | - Begoña Colás
- Departamento de Bioquímica y Biología Molecular, Universidad de Alcalá de Henares, Facultad de Medicina, Madrid 28871, Spain; E-Mails: (P.L.-R.); (B.C.); (M.A.C.)
| | - María Alicia Cortes
- Departamento de Bioquímica y Biología Molecular, Universidad de Alcalá de Henares, Facultad de Medicina, Madrid 28871, Spain; E-Mails: (P.L.-R.); (B.C.); (M.A.C.)
| | - Berta Ponsati
- BCN Peptides S.A. Pol.Ind. Els Vinyets-Els Fogars, Sector II. Ctra. Comarcal 244, Km. 22, 08777 Sant Quintí de Mediona, Barcelona 08777, Spain; E-Mails: (M.G.-C.); (J.F.-C.); (B.P.)
| | - Maria J. Macias
- Institute for Research in Biomedicine (IRB Barcelona) Baldiri Reixac, 10, Barcelona 08028, Spain; E-Mails: (P.M.-G.); (E.A.); (R.R.); (P.M.-M.); (X.V.)
- Institució Catalana de Recerca i Estudis Avançats (ICREA), Passeig Lluis Companys, 23, Barcelona 08010, Spain
- Authors to whom correspondence should be addressed; E-Mails: (M.J.M.); (A.R.); Tel.: +34-934-037-189 (M.J.M.); Fax: +34-934-047-095 (M.J.M.); Tel. +34-934-047-093 (A.R.); Fax: +34-934-047-095 (A.R)
| | - Antoni Riera
- Institute for Research in Biomedicine (IRB Barcelona) Baldiri Reixac, 10, Barcelona 08028, Spain; E-Mails: (P.M.-G.); (E.A.); (R.R.); (P.M.-M.); (X.V.)
- Departament de Química Orgànica, Universitat de Barcelona, Martí i Franqués, 1-11, Barcelona 08028, Spain
- Authors to whom correspondence should be addressed; E-Mails: (M.J.M.); (A.R.); Tel.: +34-934-037-189 (M.J.M.); Fax: +34-934-047-095 (M.J.M.); Tel. +34-934-047-093 (A.R.); Fax: +34-934-047-095 (A.R)
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Hwu JR, Varadaraju TG, Abd-Elazem IS, Huang RCC. First Total Syntheses of Oresbiusins A and B, Their Antipodes, and Racemates: Configuration Revision and Anti-HIV Activity. European J Org Chem 2012. [DOI: 10.1002/ejoc.201200689] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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Martín-Gago P, Gomez-Caminals M, Ramón R, Verdaguer X, Martin-Malpartida P, Aragón E, Fernández-Carneado J, Ponsati B, López-Ruiz P, Cortes MA, Colás B, Macias MJ, Riera A. Fine-tuning the π-π Aromatic Interactions in Peptides: Somatostatin Analogues Containing Mesityl Alanine. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201106406] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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Martín-Gago P, Gomez-Caminals M, Ramón R, Verdaguer X, Martin-Malpartida P, Aragón E, Fernández-Carneado J, Ponsati B, López-Ruiz P, Cortes MA, Colás B, Macias MJ, Riera A. Fine-tuning the π-π Aromatic Interactions in Peptides: Somatostatin Analogues Containing Mesityl Alanine. Angew Chem Int Ed Engl 2011; 51:1820-5. [DOI: 10.1002/anie.201106406] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2011] [Indexed: 01/04/2023]
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Roiban GD, Serrano E, Soler T, Aullón G, Grosu I, Cativiela C, Martínez M, Urriolabeitia EP. Regioselective orthopalladation of (Z)-2-aryl-4-arylidene-5(4H)-oxazolones: scope, kinetico-mechanistic, and density functional theory studies of the C-H bond activation. Inorg Chem 2011; 50:8132-43. [PMID: 21806046 DOI: 10.1021/ic200564d] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Orthopalladated complexes derived from (Z)-2-aryl-4-arylidene-5(4H)-oxazolones have been prepared by reaction of the oxazolone with palladium acetate in acidic medium. The reaction is regioselective, only the ortho C-H bond of the arylidene ring being activated, producing a six-membered ring. The scope and reaction conditions of the orthopalladation are dependent on the acidity of the solvent. In CF(3)CO(2)H a large number of oxazolones can be metalated under mild conditions. As acidity decreases a lesser number of oxazolones can be efficiently palladated and harsher conditions must be used to achieve similar yields. The C-H bond activation in acidic medium agrees with an ambiphilic mechanism, as determined from kinetic measurements at variable temperature and pressure for different oxazolones substituted at the arylidene ring. The mechanism has been confirmed by density functional theory (DFT) calculations, where the formation of the six-membered ring is shown to be favored from both a kinetic and a thermodynamic perspective. In addition, the dependence of the reaction rate on the acidity of the medium has also been accounted for via a fine-tuning between the C-H agostic precoordination and the proton abstraction reaction in the overall process occurring on coordinatively saturated [Pd(κ(N)-oxazolone)(RCO(2)H)(3)](2+).
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Affiliation(s)
- Gheorghe-Doru Roiban
- Organic Chemistry Department, Faculty of Chemistry and Chemical Engineering, Babes-Bolyai University, 400028, Cluj-Napoca, Romania
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Caldentey X, Pericàs MA. Phosphinite Thioethers Derived from Chiral Epoxides. Modular P,S-Ligands for Pd-Catalyzed Asymmetric Allylic Substitutions. J Org Chem 2010; 75:2628-44. [DOI: 10.1021/jo100223w] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xisco Caldentey
- Institute of Chemical Research of Catalonia (ICIQ), Av. Països Catalans 16, E-43007 Tarragona, Spain
- Departament de Química Orgànica, Universitat de Barcelona, E08028 Barcelona, Spain
| | - Miquel A. Pericàs
- Institute of Chemical Research of Catalonia (ICIQ), Av. Països Catalans 16, E-43007 Tarragona, Spain
- Departament de Química Orgànica, Universitat de Barcelona, E08028 Barcelona, Spain
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Ritzen B, van Oers MCM, van Delft FL, Rutjes FPJT. Enantioselective chemoenzymatic synthesis of trans-aziridines. J Org Chem 2009; 74:7548-51. [PMID: 19743803 DOI: 10.1021/jo901548t] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A straightforward, five-step procedure for the synthesis of enantiomerically pure 2,3-disubstituted trans-aziridines has been developed starting from commercially available aldehydes. Hydroxynitrile lyase-mediated cyanohydrin formation provided cyanohydrins in excellent enantioselectivities and good yields. Subsequent formation of diastereomerically pure anti-amino alcohols via a one-pot Grignard addition-reduction sequence, Cu(II)-catalyzed diazotransfer, and triphenylphosphine-mediated reductive cyclization provided the corresponding trans-aziridines in good yields and excellent diastereoselectivities.
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Affiliation(s)
- Bas Ritzen
- Institute for Molecules and Materials, Radboud University Nijmegen, Heyendaalseweg 135, NL-6525 AJ Nijmegen, The Netherlands
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Nieto S, Arnau P, Serrano E, Navarro R, Soler T, Cativiela C, Urriolabeitia EP. Functionalization of Methyl (R)-Phenylglycinate Through Orthopalladation: C−Hal, C−O, C−N, and C−C Bond Coupling. Inorg Chem 2009; 48:11963-75. [DOI: 10.1021/ic901941s] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sonia Nieto
- Departamento de Compuestos Organometálicos, Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Palmira Arnau
- Departamento de Compuestos Organometálicos, Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Elena Serrano
- Departamento de Compuestos Organometálicos, Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Rafael Navarro
- Departamento de Compuestos Organometálicos, Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Tatiana Soler
- Servicios Técnicos de Investigación, Facultad de Ciencias Fase II, Universidad de Alicante, 03690 San Vicente de Raspeig, Alicante, Spain
| | - Carlos Cativiela
- Departamento de Química Orgánica, Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Esteban P. Urriolabeitia
- Departamento de Compuestos Organometálicos, Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
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