# Patent

## Title
Beta-hairpin peptidomimetics having CXCR4 antagonizing activity

## Abstract

β-Hairpin peptidomimetics of the general formula Cyclo(-Xaa1-Xaa2-Xaa3-Cys4-Xaa5-Xaa6-Xaa7-Xaa8-Arg9-Tyr10-Cys11-Xaa12-Xaa13-Xaa14-Xaa15-Xaa16-), disulfide bond between Cys4 and Cys11, and pharmaceutically acceptable salts thereof, with Xaa1, Xaa2, Xaa3, Xaa5, Xaa6, Xaa7, Xaa8, Xaa12, Xaa13, Xaa14, Xaa15 and Xaa16 being amino acid residues of certain types which are defined in the description and the claims, have CXCR4 antagonizing properties and can be used for preventing HIV infections in healthy individuals or for slowing and halting viral progression in infected patients; or where cancer is mediated or resulting from CXCR4 receptor activity; or where immunological diseases are mediated or resulting from CXCR4 receptor activity; or for treating immunosuppression; or during apheresis collections of peripheral blood stem cells and/or as agents to induce mobilization of stem cells to regulate tissue repair. These peptides can be manufactured by a process which is based on a mixed solid- and solution phase synthetic strategy.

## Background
The present invention provides β-hairpin peptidomimetics which are having CXCR4 antagonizing activity.
The β-hairpin peptidomimetics of the invention are Cyclo (-Xaa1-Xaa2-Xaa3-Cys4-Xaa5-Xaa6-Xaa7-Xaa8-Arg9-Tyr10-Cys11-Xaa12-Xaa13-Xaa14-Xaa15-Xaa16-), disulfide bond between Cys4 and Cys11, and pharmaceutically acceptable salts thereof, with Xaa1 being Tyr or a γ-amino acid residue of type M as described herein below, Xaa2 being His, Tyr, Arg or Lys, Xaa3 being Ala or Tyr, Xaa5 being Ser or the D-isomer of an amino acid residue of type F as described herein below or a γ-amino acid residue of type M or a β-amino acid of type N as described herein below, Xaa6 being Ala or a β-amino acid residue of type N as described herein below, Xaa7 being -A-CO— as described herein below or the D-isomer of an amino acid residue of type D as described herein below, Xaa8 being Dab, Arg, Tyr or Thr, Xaa12 being Tyr or a γ-amino acid residue of type M as described herein below, Xaa13 being Gln or a γ-amino acid residue of type M as described herein below, Xaa14 being Lys, Orn, Ala, Gln or Glu, Xaa15 being -A-CO— as described herein below or the D-isomer of an amino acid residue of type C, or of type D, or of type E, or of type F, as described herein below or a N-substituted glycine of type I as described herein below, and Xaa16 being —B—CO— as described herein below; with the proviso that Xaa1 is a γ-amino acid residue of type M as defined herein below; and/or Xaa5 is the D-isomer of an amino acid residue of type F as defined herein below, or a γ-amino acid residue of type M as defined herein below, or a β-amino acid residue of type N as defined herein below; and/or Xaa6 is a β-amino acid residue of type N as defined herein below; and/or Xaa12 is a γ-amino acid residue of type M as defined herein below; and/or Xaa13 is a γ-amino acid residue of type M as defined herein below; and/or Xaa15 is the D-isomer of an amino acid residue of type C, or of type D, or of type E, or of type F as defined herein below, or an N-substituted glycine residue of type I as defined herein below; and/or Xaa16 is —B—CO— with B being the enantiomer of group A105 as defined herein below.
In addition, the present invention provides an efficient synthetic process by which these compounds can, if desired, be made in parallel library-format. These β-hairpin peptidomimetics show improved efficacy, bioavailability, and most importantly a significantly enhanced ratio between CXCR4 antagonizing activity on the one hand, and reduced hemolysis of red blood cells and reduced or no cytotoxicity on the other.
Many medically significant biological processes are mediated by signal transduction that involves chemokines and their receptors in general and stromal derived factor 1 (SDF-1/CXCL12) and its receptor CXCR4 in particular.
CXCR4 and its ligand SDF-1 are involved in trafficking of B cells, hematopoietic stem cells (HSC) and hematopoietic progenitor cells (HPC). For instance, CXCR4 is expressed on CD34+ cells, and has been implicated in the process of CD34+ cell migration and homing (S. M. Watt, S. P. Forde, Vox sanguinis 2008, 94, 18-32). It has also been shown that the CXCR4 receptor plays an important role in the release of stem and progenitor cells from the bone marrow to the peripheral blood (L. M. Pelus, S. Fukuda, Leukemia 2008, 22, 466-473). This activity of CXCR4 could be very important for efficient apheresis collections of peripheral blood stem cells. Autologous peripheral blood cells provide a rapid and sustained hematopoietic recovery following auto-transplantation after the administration of high-dose chemotherapy or radiotherapy in patients with haematological malignancies and solid tumors. (W. C. Liles et al., Blood 2003, 102, 2728-2730).
Recently, it has been demonstrated that SDF-1 is locally up-regulated in animal models of injury including focal ischemic stroke, global cerebral ischemia, myocardial infarction and hind limb ischemia as well as being involved in recovery after peripheral ischemia or following injury to the liver, kidney or lung (A. E. Ting, R. W. Mays, M. R. Frey, W. Van't Hof, S. Medicetty, R. Deans, Critical Reviews in Oncology/Hematology 2008, 65, 81-93 and literature cited herein; F. Lin, K. Cordes, L. Li, L. Hood, W. G. Couser, S. J. Shankland et al., J. Am. Soc. Nephrol. 2003, 14, 1188-1199; C. C. Dos Santos, Intensive Care Med. 2008, 34, 619-630). These results suggest that SDF-1 may be a chemoattractant for CXCR4-positive stem cells for tissue and organ repair/regeneration (M. Z. Ratajczak, M. Kucia, R. Reca, M. Majka, A. Janowska-Wieczorek, J. Ratajczak, Leukemia 2004, 18, 29-40). Therefore, modulating the SDF-1/CXCR4 axis by CXCR4 inhibitors should result in a significant therapeutic benefit by using released stem cells to regulate tissue repair.
More recently, it has been shown that disrupting the CXCR4/SDF-1 retention axis by CXCR4 inhibitors plays a crucial role in differential mobilization of progenitor cells like HPCs, endothelial (EPCs) and stromal progenitor cells (SPCs) from the bone marrow (S. C. Pitchford, R. C. Furze, C. P. Jones, A. M. Wegner, S. M. Rankin, Cell Stem Cell 2009, 4, 62). In addition, bone marrow-derived CXCR4+ Very Small Embryonic-Like Stem Cells (VSELs) were mobilized in patients with acute myocardial infarction indicating a hypothetical reparatory mechanism (W. Wojakowski, M. Tendra, M. Kucia, E. Zuba-Surma, E. Paczkowska, J. Ciosek, M. Halasa, M. Król, M. Kazmierski, P. Buszman, A. Ochala, J. Ratajczak, B. Machalinski, M. Z. Ratajczak J. Am. Coll. Cardiol. 2009, 53, 1). These findings may be exploited to provide efficacious stem cell therapy for tissue regeneration.
There is increasing evidence suggesting that chemokines in general and the SDF-1/CXCR4 interaction in particular play a pivotal role in angiogenesis. Chemokines induce angiogenesis directly by binding their cognate receptors on endothelial cells or indirectly by promoting inflammatory cell infiltrates, which deliver other angiogenic stimuli. A number of proinflammatory chemokines including interleukin 8 (IL-8), growth-regulated oncogene, stromal cell-derived factor 1 (SDF-1), monocyte chemotactic protein 1 (MCP-1), eotaxin 1, and I-309 have been shown to act as direct inducers of angiogenesis. (X. Chen, J. A. Beutler, T. G. McCloud, A. Loehfelm, L. Yang, H. F. Dong, O. Y. Chertov, R. Salcedo, J. J. Oppenheim, O. M. Howard. Clin. Cancer Res. 2003, 9(8), 3115-3123; R. Salcedo, J. J. Oppenheim, Microcirculation 2003, (3-4), 359-370).
Recently obtained results show that the CXCR4 receptor is involved in the chemotactic activity of cancer cells, such as breast cancer metastasis or in metastasis of ovarian cancer (A. Muller, B. Homey, H. Soto, N. Ge, D. Catron, M. E. Buchanan, T. Mc Clanahan, E. Murphey, W. Yuan, S. N. Wagner, J. L. Barrera, A. Mohar, E. Verastegui, A. Zlotnik, Nature 2001, 50, 410; J. M. Hall, K. S. Korach, Molecular Endocrinology 2003, 17, 792-803.), Non-Hodgin's Lymphoma (F. Bertolini, C. Dell'Agnola, P. Manusco, C. Rabascio, A. Burlini, S. Monestiroli, A. Gobbi, G. Pruneri, G. Martinelli, Cancer Research 2002, 62, 3106-3112), or lung cancer (T. Kijima, G. Maulik, P. C. Ma, E. V. Tibaldi, R. E. Turner, B. Rollins, M. Sattler, B. E. Johnson, R. Salgia, Cancer Research 2002, 62, 6304-6311), melanoma, prostate cancer, kidney cancer, neuroblastomia, pancreatic cancer, multiple myeloma, chronic lymphocytic leukemia, hepatocellular carcinoma, colorectal carcinoma, endometrial cancer, germ cell tumor (H. Tamamura et al., FEBS Letters 2003, 550, 79-83, cited ref.; Z. Wang, Q. Ma, Q. Liu, H. Yu, L. Zhao, S. Shen, J. Yao, British Journal of Cancer 2008, 99, 1695; B. Sung, S. Jhurani, K. S. Ahn, Y. Mastuo, T. Yi, S. Guha, M. Liu, B. Aggarwal, Cancer Res. 2008, 68, 8938; H. Liu, Z. Pan, A. Li, S. Fu, Y. Lei, H. Sun, M. Wu, W. Zhou, Cellular and Molecular Immunology, 2008, 5, 373; C. Rubie, O. Kollmari, V. O. Frick, M. Wagner, B. Brittner, S. Gräber, M. K. Schilling, Scandinavian Journal of Immunology 2008, 68, 635; S. Gelmini, M. Mangoni, F. Castiglioe, C. Beltrami, A. Pieralli, K. L. Andersson, M. Fambrini, G. l. Taddie, M. Serio, C. Orlando, Clin. Exp. Metastasis 2009, 26, 261; D. C. Gilbert, I. Chandler, A. McIntyre, N. C. Goddrd, R. Gabe, R. A. Huddart, J. Shipley, J. Pathol. 2009, 217, 94). Blocking the chemotactic activity with a CXCR4 inhibitor should stop the migration of cancer cells and thus metastasis.
CXCR4 has also been implicated in the growth and proliferation of solid tumors and leukemia/lymphoma. It was shown that activation of the CXCR4 receptor was critical for the growth of both malignant neuronal and glial tumors. Moreover, systemic administration of the CXCR4 antagonist AMD3100 inhibits growth of intracranial glioblastoma and medulloblastoma xenografts by increasing apoptosis and decreasing the proliferation of tumor cells (J. B. Rubin, A. L Kung, R. S Klein, J. A. Chan, Y. Sun, K. Schmidt, M. W. Kieran, A. D. Luster, R. A. Segal, Proc Natl Acad Sci U S A. 2003, 100(23), 13513-13518; S. Barbero, R. Bonavia, A. Bajetto, C. Porcile, P. Pirani, J. L. Ravetti, G. L. Zona, R. Spaziante, T. Florio, G. Schettini, Cancer Res. 2003, 63(8), 1969-1974; T. Kijima, G. Maulik, P. C. Ma, E. V. Tibaldi, R. E. Turner, B. Rollins, M. Sattler, B. E. Johnson, R. Salgia. Cancer Res. 2002, 62(21), 6304-6311). CXCR4 inhibitors also showed promising in vitro and in vivo efficacies in breast cancer, small cell lung cancer, pancreatic cancer, gastric cancer, colorectal cancer, malignant melanoma, ovarian cancer, rhabdomyo-sarcoma, prostate cancer as well as chronic lymphocytic leukemia, acute myelogenous leukemia, acute lymphoblastic leukemia, multiple myeloma and Non-Hodgkin's lymphoma (J. A. Burger, A. Peled, Leukemia 2009, 23, 43-52 and literature cited herein).
It is well established that chemokines are involved in a number of inflammatory pathologies and some of them show a pivotal role in the modulation of osteoclast development. Immunostaining for SDF-1 (CXCL12) on synovial and bone tissue biopsies from both rheumatoid arthritis (RA) and osteoarthritis (OA) samples have revealed strong increases in the expression levels of chemokines under inflammatory conditions (F. Grassi, S. Cristino, S. Toneguzzi, A. Piacentini, A. Facchini, G. Lisignoli, J. Cell Physiol. 2004; 199(2), 244-251). It seems likely that the CXCR4 receptor plays an important role in inflammatory diseases such as rheumatoid arthritis, asthma, or multiple sclerosis (K. R. Shadidi et al., Scandinavian Journal of Immunology 2003, 57, 192-198; J. A. Gonzalo, J. Immunol. 2000, 165, 499-508; S. Hatse et al., FEBS Letters 2002, 527, 255-262 and cited references). The mediation of recruitment of immune cells to sites of inflammation should be stopped by a CXCR4 inhibitor.
To date the available therapies for the treatment of HIV infections have been leading to a remarkable improvement in symptoms and recovery from disease in infected people. Although the highly active anti retroviral therapy (HAART) which involves a combination of reverse transcriptase/protease-inhibitor has dramatically improved the clinical treatment of individuals with AIDS or HIV infection, there have still remained several serious problems including multi drug resistance, significant adverse effects and high costs.
Particularly desired are anti HIV agents that block the HIV infection at an early stage of the infection, such as the viral entry. It has recently been recognized that for efficient entry into target cells, human immunodeficiency viruses require the chemokine receptors CCR5 and CXCR4 as well as the primary receptor CD4 (N. Levy, Engl. J. Med. 1996, 335, 1528-1530). Accordingly, an agent which could block the CXCR4 chemokine receptors should prevent infections in healthy individuals and slow or halt viral progression in infected patients (J. Cohen, Science 1997, 275, 1261-1264).
Among the different types of CXCR4 inhibitors (M. Schwarz, T. N. C. Wells, A. E. I. Proudfoot, Receptors and Channels 2001, 7, 417-428; Y. Lavrovsky, Y. A. Ivanenkov, K. V. Balakin, D. A. Medvedewa, P. V. Ivachtchenko, Mini Rev. Med. Chem. 2008, 11, 1075-1087), one emerging class is based on naturally occurring cationic peptide analogues derived from Polyphemusin II which have an antiparallel β-sheet structure, and a β-hairpin that is maintained by two disulfide bridges (H. Nakashima, M. Masuda, T. Murakami, Y. Koyanagi, A. Matsumoto, N. Fujii, N. Yamamoto, Antimicrobial Agents and Chemoth. 1992, 36, 1249-1255; H. Tamamura, M. Kuroda, M. Masuda, A. Otaka, S. Funakoshi, H. Nakashima, N. Yamamoto, M. Waki, A. Matsumotu, J. M. Lancelin, D. Kohda, S. Tate, F. Inagaki, N. Fujii, Biochim. Biophys. Acta 1993, 209, 1163; WO 95/10534 A1).
Synthesis of structural analogs and structural studies by nuclear magnetic resonance (NMR) spectroscopy have shown that the cationic peptides adopt well defined β-hairpin conformations, due to the constraining effect of the one or two disulfide bridges (H. Tamamura, M. Sugioka, Y. Odagaki, A. Omagari, Y. Kahn, S. Oishi, H. Nakashima, N. Yamamoto, S. C. Peiper, N. Hamanaka, A. Otaka, N. Fujii, Bioorg. Med. Chem. Lett. 2001, 359-362). These results show that the β-hairpin structure plays an important role in CXCR4 antagonizing activity.
Additional structural studies have also indicated that the antagonizing activity can also be influenced by modulating amphiphilic structure and the pharmacophore (H. Tamamura, A. Omagari, K. Hiramatsu, K. Gotoh, T. Kanamoto, Y. Xu, E. Kodama, M. Matsuoka, T. Hattori, N. Yamamoto, H. Nakashima, A. Otaka, N. Fujii, Bioorg. Med. Chem. Lett. 2001, 11, 1897-1902; H. Tamamura, A. Omagari, K. Hiramatsu, S. Oishi, H. Habashita, T. Kanamoto, K. Gotoh, N. Yamamoto, H. Nakashima, A. Otaka N. Fujii, Bioorg. Med. Chem. 2002, 10, 1417-1426; H. Tamamura, K. Hiramatsu, K. Miyamoto, A. Omagari, S. Oishi, H. Nakashima, N. Yamamoto, Y. Kuroda, T. Nakagawa, A. Otaki, N. Fujii, Bioorg. Med. Chem. Letters 2002, 12, 923-928).
The compounds Cyclo (-Xaa1-Xaa2-Xaa3-Cys4-Xaa5-Xaa6-Xaa7-Xaa8-Arg9-Tyr10-Cys11-Xaa12-Xaa13-Xaa14-Xaa15-Xaa16-), disulfide bond between Cys4 and Cys11, are cyclic β-hairpin peptidomimetics exhibiting high CXCR4 antagonizing activity, being useful for efficient apheresis collections of mobilized peripheral blood stem cells and/or using these mobilized cells to regulate tissue repair, and having anticancer activity, anti inflammatory activity and anti HIV activity.
The cyclic β-hairpin conformation is induced by the D-amino acid residue Xaa7 and the D-amino acid or N-substituted glycine residue Xaa15 and fostered by the conserved amino acids at positions 4, 9, 10 and 11 within the sequence. Further stabilization of the hairpin conformation is achieved by the disulfide bridge between Cys4 and Cys11. In addition, incorporation of structural elements derived from β- and γ-amino acids into cyclic β-hairpin peptidomimetics has been realized, a new approach which has not previously been evaluated for development of β-hairpin peptidomimetics of that ring size with CXCR4 antagonizing activity.
Backbone modifications, such as incorporation of β- and/or γ-amino acids into cyclic β-hairpin peptidomimetics may enhance peptide recognition by altering both the electronic conditions of the amide bonds and the degrees of conformational freedom following insertion of one or two additional methylene groups according to β- or γ-amino acids (J. Nurbo, S. D. Peterson, G. Dahl, U. H. Danielson, A. Karlén, A. Sandström, Bioorg. Med. Chem. 2008, 16, 5590; G. Guichard, A. Zerbib, F.-A. Le Gal, J. Hoebeke, F. Connan, J. Choppin, J.-P. Briand, J.-G. Guillet, J. Med. Chem. 2000, 42, 3803). Moreover, as human peptidases generally do not recognize peptides containing β- or γ-amino acids these peptides should be more resistant to proteolytic degradation (M.-I. Aguilar, A. W. Purcell, R. Devi, R. Lew, J. Rossjohn, A. I. Smith, P. Perlmutter, Org. Biomol. Chem. 2007, 5, 2884; D. F. Hook, P. Bindschaedler, Y. R. Mahayan, R. Sebesta, P. Kast, D. Seebach, Chem. Biodivers. 2005, 2, 591; P. Zubrzak, H. Williams, G. M. Coast, R. E. Isaac, G. Reyes-Rangel, E. Juaristi, J. Zabrocki, R. J. Nachman, Biopolymers 2007, 88, 76; S. Sagan, Th. Milcent, R. Ponsinet, O. Convert, O. Tasseau, G. Chassaing, S. Lavielle, O. Lequin, Eur. J. Biochem. 2003, 270, 939).
β-hairpin mimetic peptides have been described in the literature (D. Obrecht, M. Altorfer, J. A. Robinson, Adv. Med. Chem. 1999, 4, 1-68; J. A. Robinson, Syn. Lett. 2000, 4, 429-441), and the ability to generate β-hairpin peptidomimetics using combinatorial and parallel synthesis methods has now been established (L. Jiang, K. Moehle, B. Dhanapal, D. Obrecht, J. A. Robinson, Helv. Chim. Acta. 2000, 83, 3097-3112). However, the additional incorporation of structural elements derived from β- and γ-amino acids into β-hairpin mimetics by applying and altering these methods has not previously been evaluated for development of CXCR4 antagonizing peptides of that ring size. The methods described here allow the synthesis and screening of large hairpin mimetic libraries, which in turn considerably facilitates structure-activity studies, and hence the discovery of new molecules with highly potent CXCR4 antagonizing activity or anti cancer activity or anti inflammatory activity or anti HIV activity and low hemolytic activity to human red blood cells.
β-Hairpin peptidomimetics obtained by the approach described here can be used in apheresis collections of peripheral blood stem cells and/or as agents to induce mobilization of stem cells to regulate tissue repair or are useful as anticancer agents, as inhibitors of tumor growth or as apoptosis inducing agents, as anti-metastasis agents, as anti inflammatory agents and as anti-HIV agents.
The β-hairpin peptidomimetics of the present invention are compounds of the general formula Cyclo(-Xaa1-Xaa2-Xaa3-Cys4-Xaa5-Xaa6-Xaa2-Xaa8-Arg9-Tyr10-Cys11-Xaa12-Xaa13-Xaa14-Xaa15-Xaa16-), disulfide bond between Cys4 and Cys11,
wherein


    Xaa1 is Tyr or a γ-amino acid residue of type M as defined herein below,
    Xaa2 is His, Tyr, Arg or Lys,
    Xaa3 is Ala or Tyr,
    Xaa5 is Ser or the D-isomer of an amino acid residue of type F as defined herein below or a γ-amino acid residue of type M as defined herein below or an β-amino acid of type N as defined herein below,
    Xaa6 is Ala or a β-amino acid residue of type N as described herein below,
    Xaa7 is -A-CO— as described hereafter or the D-isomer of an amino acid residue of type D as described herein below,
    Xaa8 is Dab, Arg, Tyr or Thr,
    Xaa12 is Tyr or a γ-amino acid residue of type M as described herein below,
    Xaa13 is Gln or an γ-amino acid residue of type M as described herein below,
    Xaa14 is Lys, Orn, Ala, Gln or Glu,
    Xaa15 is -A-CO— as described herein below or the D-isomer of an amino acid residue of type C, or of type D, or of type E, or of type F, as described herein below or a N-substituted glycine residue of type I as described herein below, and
    Xaa16 is —B—CO— as described herein below;

with the proviso that
    
        Xaa1 is a γ-amino acid residue of type M as defined herein below;

and/or

        Xaa5 is the D-isomer of an amino acid residue of type F as defined herein below, or a γ-amino acid residue of type M as defined herein below, or a β-amino acid residue of type N as defined herein below;

and/or

        Xaa6 is a β-amino acid residue of type N as defined herein below;

and/or

        Xaa12 is a γ-amino acid residue of type M as defined herein below;

and/or

        Xaa13 is a γ-amino acid residue of type M as defined herein below;

and/or

        Xaa15 is the D-isomer of an amino acid residue of type C, or of type D, or of type E, or of type F as defined herein below, or an N-substituted glycine residue of type I as defined herein below;

and/or

        Xaa16 is —B—CO— with B being the enantiomer of group A105 as defined herein below;
    
    
    —B—CO— is Gly, or the residue of an L-α-amino acid with B being a residue of formula —NR20CH(R71)—, or —NR20CH(R72)—, or —NR20CH(R73)— or —NR20CH(R74)— or —NR20CH(R84)— or the enantiomer of one of the groups A1 to A69 and A105 as defined hereinafter;


A of -A-CO— is a group of one of the formulae











































    R1 is H; lower alkyl; or aryl-lower alkyl;
    R2 is H; alkyl; alkenyl; —(CH2)p(CHR61)sOR55; —(CH2)p(CHR61)sSR56; —(CH2)p(CHR61)sNR33R34; —(CH2)p(CHR61)sOCONR33R75; —(CH2)p(CHR61)sNR20CONR33R82; —(CH2)o(CHR61)sCOOR57; —(CH2)o(CHR61)sCONR58R59; —(CH2)o(CHR61)sPO(OR60)2; —(CH2)o(CHR61)sSO2R62; or —(CH2)o(CHR61)sR77;
    R3 is alkyl; alkenyl; —(CH2)o(CHR61)sOR55; —(CH2)o(CHR61)sSR56; —(CH2)o(CHR61)sNR33R34; —(CH2)o(CHR61)sOCONR33R75; —(CH2)o(CHR61)sNR20CONR33R82; —(CH2)o(CHR61)sCOOR57; —(CH2)o(CHR61)sCONR58R59; —(CH2)o(CHR61)sPO(OR60)2; —(CH2)o(CHR61)sSO2R62; or —(CH2)o(CHR61)sC6H4R8;
    R4 is H; alkyl; alkenyl; —(CH2)m(CHR61)sOR55; —(CH2)m(CHR61)sSR56; —(CH2)m(CHR61)sNR33R34; —(CH2)m(CHR61)sOCONR33R75; —(CH2)m(CHR61)sNR20CONR33R82; —(CH2)p(CHR61)sCOOR57; —(CH2)p(CHR61)sCONR58R59; —(CH2)p(CHR61)sPO(OR60)2; —(CH2)p(CHR61)sSO2R62; or —(CH2)o(CHR61)sC6H4R8;
    R5 is H; alkyl; alkenyl; —(CH2)m(CHR61)sOR55; —(CH2)m(CHR61)sSR56; —(CH2)m(CHR61)sNR33R34; —(CH2)m(CHR61)sOCONR33R75; —(CH2)m(CHR61)sNR20CONR33R82; —(CH2)o(CHR61)sCOOR57; —(CH2)o(CHR61)sCONR58R59; —(CH2)o(CHR61)sPO(OR60)2; —(CH2)o(CHR61)sSO2R62; or —(CH2)o(CHR61)sC6H4R8;
    R6 is H; alkyl; alkenyl; —(CH2)o(CHR61)sOR55; —(CH2)o(CHR61)sSR56; —(CH2)o(CHR61)sNR33R34; —(CH2)o(CHR61)sOCONR33R75; —(CH2)o(CHR61)sNR20CONR33R82; —(CH2)o(CHR61)sCOOR57; —(CH2)o(CHR61)sCONR58R59; —(CH2)o(CHR61)sPO(OR60)2; —(CH2)o(CHR61)sSO2R62; or —(CH2)o(CHR61)sC6H4R8;
    R7 is alkyl; alkenyl; —(CH2)q(CHR61)sOR55; —(CH2)q(CHR61)sNR33R34; —(CH2)q(CHR61)sOCONR33R75; —(CH2)q(CHR61)sNR20CONR33R82; —(CH2)r(CHR61)sCOOR57; —(CH2)r(CHR61)sCONR58R59; —(CH2)r(CHR61)sPO(OR60)2; —(CH2)r(CHR61)sSO2R62; or —(CH2)r(CHR61)sC6H4R8;
    R8 is H; Cl; F; CF3; NO2; lower alkyl; lower alkenyl; aryl; aryl-lower alkyl; —(CH2)o(CHR61)sR77 —(CH2)o(CHR61)sOR55; —(CH2)o(CHR61)sSR56; —(CH2)o(CHR61)NR33R34; —(CH2)o(CHR61)sOCONR33R75; —(CH2)o(CHR61)sNR20CONR33R82; —(CH2)o(CHR61)sCOOR57; —(CH2)o(CHR61)sCONR58R59; —(CH2)o(CHR61)sPO(OR60)2; —(CH2)o(CHR61)sSO2R62; or —(CH2)o(CHR61)sCOR64;
    R9 is alkyl; alkenyl; —(CH2)o(CHR61)sOR55; —(CH2)o(CHR61)sSR56; —(CH2)o(CHR61)sNR33R34; —(CH2)o(CHR61)sOCONR33R75; —(CH2)o(CHR61)sNR20CONR33R82; —(CH2)o(CHR61)sCOOR57; —(CH2)o(CHR61)sCONR58R59; —(CH2)o(CHR61)sPO(OR60)2; —(CH2)o(CHR61)sSO2R62; or —(CH2)o(CHR61)sC6H4R8;
    R10 is alkyl; alkenyl; —(CH2)o(CHR61)sOR55; —(CH2)o(CHR61)sSR56; —(CH2)o(CHR61)sNR33R34; —(CH2)o(CHR61)sOCONR33R75; —(CH2)o(CHR61)sNR20CONR33R82; —(CH2)o(CHR61)sCOOR57; —(CH2)o(CHR61)sCONR58R59; —(CH2)o(CHR61)sPO(OR60)2; —(CH2)o(CHR61)sSO2R62; or —(CH2)o(CHR61)sC6H4R8;
    R11 is H; alkyl; alkenyl; —(CH2)m(CHR61)sOR55; —(CH2)m(CHR61)sNR33R34; —(CH2)m(CHR61)sOCONR33R75; —(CH2)m(CHR61)sNR20CONR33R82; —(CH2)o(CHR61)sCOOR57; —(CH2)o(CHR61)sCONR58R59; —(CH2)o(CHR61)sPO(OR60)2; —(CH2)o(CHR61)sSO2R62; or —(CH2)o(CHR61)sC6H4R8;
    R12 is H; alkyl; alkenyl; —(CH2)m(CHR61)sOR55; —(CH2)m(CHR61)sSR56; —(CH2)m(CHR61)sNR33R34; —(CH2)m(CHR61)sOCONR33R75; —(CH2)m(CHR61)sNR20CONR33R82; —(CH2)r(CHR61)sCOOR57; —(CH2)r(CHR61)sCONR58R59; —(CH2)r(CHR61)sPO(OR60)2; —(CH2)r(CHR61)sSO2R62; or —(CH2)r(CHR61)sC6H4R8;
    R13 is alkyl; alkenyl; —(CH2)q(CHR61)sOR55; —(CH2)q(CHR61)sSR56; —(CH2)q(CHR61)sNR33R34; —(CH2)q(CHR61)sOCONR33R75; —(CH2)q(CHR61)sNR20CONR33R82; —(CH2)q(CHR61)sCOOR57; —(CH2)q(CHR61)sCONR58R59; —(CH2)q(CHR61)sPO(OR60)2; —(CH2)q(CHR61)sSO2R62; or —(CH2)q(CHR61)sC6H4R8;
    R14 is H; alkyl; alkenyl; —(CH2)m(CHR61)sOR55; —(CH2)m(CHR61)sNR33R34; —(CH2)m(CHR61)sOCONR33R75; —(CH2)m(CHR61)sNR20CONR33R82; —(CH2)q(CHR61)sCOOR57; —(CH2)q(CHR61)sCONR58R59; —(CH2)q(CHR61)sPO(OR60)2;. —(CH2)q(CHR61)sSOR62; or —(CH2)q(CHR61)sC6H4R8;
    R15 is alkyl; alkenyl; —(CH2)o(CHR61)sOR55; —(CH2)o(CHR61)sSR56; —(CH2)o(CHR61)sNR33R34; —(CH2)o(CHR61)sOCONR33R75; —(CH2)o(CHR61)sNR20CONR33R82; —(CH2)o(CHR61)sCOOR57; —(CH2)o(CHR61)sCONR58R59; —(CH2)o(CHR61)sPO(OR60)2; —(CH2)o(CHR61)sSO2R62; or —(CH2)o(CHR61)sC6H4R8;
    R16 is alkyl; alkenyl; —(CH2)o(CHR61)sOR55; —(CH2)o(CHR61)sSR56; —(CH2)o(CHR61)sNR33R34; —(CH2)o(CHR61)sOCONR33R75; —(CH2)o(CHR61)sNR20CONR33R82; —(CH2)o(CHR61)sCOOR57; —(CH2)o(CHR61)sCONR58R59; —(CH2)o(CHR61)sPO(OR60)2; —(CH2)o(CHR61)sSO2R62; or —(CH2)o(CHR61)sC6H4R8;
    R17 is alkyl; alkenyl; —(CH2)q(CHR61)sOR55; —(CH2)q(CHR61)sSR56; —(CH2)q(CHR61)sNR33R34; —(CH2)q(CHR61)sOCONR33R75; —(CH2)q(CHR61)sNR20CONR33R82; —(CH2)q(CHR61)sCOOR57; —(CH2)q(CHR61)sCONR58R59; —(CH2)q(CHR61)sPO(OR60)2; —(CH2)q(CHR61)sSO2R62; or —(CH2)q(CHR61)sC6H4R8;
    R18 is alkyl; alkenyl; —(CH2)p(CHR61)sOR55; —(CH2)p(CHR61)sSR56; —(CH2)p(CHR61)sNR33R34; —(CH2)p(CHR61)sOCONR33R75; —(CH2)p(CHR61)sNR20CONR33R82; —(CH2)p(CHR61)sCOOR57; —(CH2)p(CHR61)sCONR58R59; —(CH2)p(CHR61)sPO(OR60)2; —(CH2)p(CHR61)sSO2R62; or —(CH2)o(CHR61)sC6H4R8;
    R19 is lower alkyl; —(CH2)p(CHR61)sOR55; —(CH2)p(CHR61)sSR56; —(CH2)p(CHR61)sNR33R34; —(CH2)p(CHR61)sOCONR33R75; —(CH2)p(CHR61)SNR20CONR33R82; —(CH2)p(CHR61)sCOOR57; —(CH2)p(CHR61)sCONR58R59; —(CH2)p(CHR61)sPO(OR60)2; —(CH2)p(CHR61)sSO2R62; or —(CH2)o(CHR61)sC6H4R8; or
    R18 and R19 taken together can form: —(CH2)2-6—; —(CH2)2O(CH2)2—; —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2—;
    R20 is H; alkyl; alkenyl; or aryl-lower alkyl;
    R21 is H; alkyl; alkenyl; —(CH2)o(CHR61)sOR55; —(CH2)o(CHR61)sSR56; —(CH2)o(CHR61)sNR33R34; —(CH2)o(CHR61)sOCONR33R75; —(CH2)o(CHR61)sNR20CONR33R82; —(CH2)o(CHR61)sCOOR57; —(CH2)o(CHR61)sCONR58R59; —(CH2)o(CHR61)sPO(OR60)2; —(CH2)o(CHR61)sSO2R62; or —(CH2)o(CHR61)sC6H4R8;
    R22 is H; alkyl; alkenyl; —(CH2)o(CHR61)sOR55; —(CH2)o(CHR61)sSR56; —(CH2)o(CHR61)sNR33R34; —(CH2)o(CHR61)sOCONR33R75; —(CH2)o(CHR61)sNR20CONR33R82; —(CH2)o(CHR61)sCOOR57; —(CH2)o(CHR61)sCONR58R59; —(CH2)o(CHR61)sPO(OR60)2; —(CH2)o(CHR61)sSO2R62; or —(CH2)o(CHR61)sC6H4R8;
    R23 is alkyl; alkenyl; —(CH2)o(CHR61)sOR55; —(CH2)o(CHR61)sSR56; —(CH2)o(CHR61)sNR33R34; —(CH2)o(CHR61)sOCONR33R75; —(CH2)o(CHR61)sNR20CONR33R82; —(CH2)o(CHR61)sCOOR57; —(CH2)o(CHR61)sCONR58R59; —(CH2)o(CHR61)sPO(OR60)2; —(CH2)o(CHR61)sSO2R62; or —(CH2)o(CHR61)sC6H4R8;
    R24 is alkyl; alkenyl; —(CH2)o(CHR61)sOR55; —(CH2)o(CHR61)sSR56; —(CH2)o(CHR61)sNR33R34; —(CH2)o(CHR61)sOCONR33R75; —(CH2)o(CHR61)sNR20CONR33R82; —(CH2)o(CHR61)sCOOR57; —(CH2)o(CHR61)sCONR58R59; —(CH2)o(CHR61)sPO(OR60)2; —(CH2)o(CHR61)sSO2R62; or —(CH2)o(CHR61)sC6H4R8;
    R25 is H; alkyl; alkenyl; —(CH2)m(CHR61)sOR55; —(CH2)m(CHR61)sSR56; —(CH2)m(CHR61)sNR33R34; —(CH2)m(CHR61)sOCONR33R75; —(CH2)m(CHR61)sNR20CONR33R82; —(CH2)o(CHR61)sCOOR57; —(CH2)o(CHR61)sCONR58R59; —(CH2)o(CHR61)sPO(OR60)2; —(CH2)o(CHR61)sSO2R62; or —(CH2)o(CHR61)sC6H4R8;
    R26 is H; alkyl; alkenyl; —(CH2)m(CHR61)sOR55; —(CH2)m(CHR61)sSR56; —(CH2)m(CHR61)sNR33R34; —(CH2)m(CHR61)sOCONR33R75; —(CH2)m(CHR61)sNR20CONR33R82; —(CH2)o(CHR61)sCOOR57; —(CH2)o(CHR61)sCONR58R59; —(CH2)o(CHR61)sPO(OR60)2; —(CH2)o(CHR61)sSO2R62; or —(CH2)o(CHR61)sC6H4R8; or
    R25 and R26 taken together can form: —(CH2)2-6—; —(CH2)rO(CH2)r; —(CH2)rS(CH2)r—; or —(CH2)rNR57(CH2)r—;
    R27 is H; alkyl; alkenyl; —(CH2)o(CHR61)sOR55; —(CH2)o(CHR61)sSR56; —(CH2)o(CHR61)sNR33R34; —(CH2)o(CHR61)sCOOR57; —(CH2)o(CHR61)sCONR58R59; —(CH2)o(CHR61)sOCONR33R75; —(CH2)o(CHR61)sNR20CONR33R82; —(CH2)o(CHR61)sPO(OR60)2; —(CH2)o(CHR61)sSO2R62; or —(CH2)o(CHR61)sC6H4R8;
    R28 is alkyl; alkenyl; —(CH2)o(CHR61)s—OR55; —(CH2)o(CHR61)s SR56; —(CH2)o(CHR61)sNR33R34; —(CH2)o(CHR61)sOCONR33R75; —(CH2)o(CHR61)sNR20CONR33R82; —(CH2)o(CHR61)sCOOR52; —(CH2)o(CHR61)sCONR58R59; —(CH2)o(CHR61)sPO(OR60)2; —(CH2)o(CHR61)sSO2R62; or —(CH2)o(CHR61)sC6H4R8;
    R29 is alkyl; alkenyl; —(CH2)o(CHR61)sOR55; —(CH2)o(CHR61)sSR56; —(CH2)o(CHR61)sNR33R34; —(CH2)o(CHR61)sOCONR33R75; —(CH2)o(CHR61)sNR20CONR33R82; —(CH2)o(CHR61)sCOOR52; —(CH2)o(CHR61)sCONR58R59; —(CH2)o(CHR61)sPO(OR60)2; —(CH2)o(CHR61)sSO2R62; or —(CH2)o(CHR61)sC6H4R8;
    R33 is H; alkyl, alkenyl; —(CH2)m(CHR61)sOR55; —(CH2)m(CHR61)sNR34R63; —(CH2)m(CHR61)sOCONR75R82; —(CH2)m(CHR61)sNR20CONR78R82; —(CH2)o(CHR61)sCOR64; —(CH2)o(CHR61)s—CONR58R59, —(CH2)o(CHR61)sPO(OR60)2; —(CH2)o(CHR61)sSO2R62; or —(CH2)o(CHR61)sC6H4R8;
    R34 is H; lower alkyl; aryl, or aryl-lower alkyl; or
    R33 and R34 taken together can form: —(CH2)2-6—; —(CH2)2O(CH2)2—; —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2—;
    R50 is H; lower alkyl; or aryl-lower alkyl;
    R55 is H; lower alkyl; lower alkenyl; aryl-lower alkyl; —(CH2)m(CHR61)sOR52; —(CH2)m(CHR61)sNR34R63; —(CH2)m(CHR61)sOCONR75R82; —(CH2)m(CHR61)sNR20CONR78R82; —(CH2)o(CHR61)s—COR64; —(CH2)o(CHR61)COOR57; or —(CH2)o(CHR61)sCONR58R59;
    R56 is H; lower alkyl; lower alkenyl; aryl-lower alkyl; —(CH2)m(CHR61)sOR57; —(CH2)m(CHR61)sNR34R63; —(CH2)m(CHR61)sOCONR75R82; —(CH2)m(CHR61)sNR20CONR78R82; —(CH2)o(CHR61)s—COR64; or —(CH2)o(CHR61)sCONR58R59;
    R57 is H; lower alkyl; lower alkenyl; aryl lower alkyl; or heteroaryl lower alkyl;
    R58 is H; lower alkyl; lower alkenyl; aryl; heteroaryl; aryl-lower alkyl; or heteroaryl-lower alkyl;
    R59 is H; lower alkyl; lower alkenyl; aryl; heteroaryl; aryl-lower alkyl; or heteroaryl-lower alkyl; or
    R58 and R59 taken together can form: —(CH2)2-6—; —(CH2)2O(CH2)2—; —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2—;
    R60 is H; lower alkyl; lower alkenyl; aryl; or aryl-lower alkyl;
    R61 is alkyl; alkenyl; aryl; heteroaryl; aryl-lower alkyl; heteroaryl-lower alkyl; —(CH2)pOR55; —(CH2)pNR33R34; —(CH2)pOCONR75R82; —(CH2)pNR20CONR78R82; —(CH2)oCOOR37; or —(CH2)oPO(OR60)2;
    R62 is lower alkyl; lower alkenyl; aryl, heteroaryl; or aryl-lower alkyl;
    R63 is H; lower alkyl; lower alkenyl; aryl, heteroaryl; aryl-lower alkyl; heteroaryl-lower alkyl; —COR64; —COOR57; —CONR58R58; —SO2R62; or —PO(OR60)2; or
    R34 and R63 taken together can form: —(CH2)2-6—; —(CH2)2O(CH2)2—; —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2—;
    R64 is H; lower alkyl; lower alkenyl; aryl; heteroaryl; aryl-lower alkyl; heteroaryl-lower alkyl; —(CH2)p(CHR61)sOR65; —(CH2)p(CHR61)sSR66; —(CH2)p(CHR61)sNR34R63; —(CH2)p(CHR61)sOCONR75R82; or —(CH2)p(CHR61)sNR20CONR78R82;
    R65 is H; lower alkyl; lower alkenyl; aryl, aryl-lower alkyl; heteroaryl-lower alkyl; —COR57; —COOR57; or —CONR58R59;
    R66 is H; lower alkyl; lower alkenyl; aryl; aryl-lower alkyl; heteroaryl-lower alkyl; or —CONR58R59;
    R67 is H; Cl; Br; F; NO2; —NR34COR57; —CF3; CN; —OCF3; —OCHF2; —OR57; —SR62; lower alkyl; or lower alkenyl;
    R68 is H; Cl; Br; F; NO2; —NR34COR57; —CF3; CN; —OCF3; —OCHF2; —OR57; —SR62; lower alkyl; or lower alkenyl;
    R69 is H; Cl; Br; F; NO2; —NR34COR57; —CF3; CN; —OCF3; —OCHF2; —OR57; —SR62; lower alkyl; or lower alkenyl;
    R70 is H; Cl; Br; F; NO2; —NR34COR57; —CF3; CN; —OCF3; —OCHF2; —OR57; —SR62; lower alkyl; or lower alkenyl;
    R71 is lower alkyl; lower alkenyl; —(CH2)p(CHR61)sOR75; —(CH2)p(CHR61)sSR75; —(CH2)p(CHR61)sNR33R34; —(CH2)p(CHR61)sOCONR33R75; —(CH2)p(CHR61)sNR20CONR33R82; —(CH2)o(CHR61)sCOOR75; —(CH2)pCONR58R59; —(CH2)pPO(OR62)2; —(CH2)pSO2R62; or —(CH2)o—C6R67R68R69R70R76;
    R72 is alkyl; alkenyl; —(CH2)p(CHR61)sOR85; or —(CH2)p(CHR61)sSR85;
    R73 is —(CH2)oR77; —(CH2)rO(CH2)oR77; —(CH2)rS(CH2)oR77; or —(CH2)rNR20(CH2)oR77;
    R74 is —(CH2)pNR78R79; —(CH2)pNR77R80; —(CH2)pC(═NR80)NR78R79; —(CH2)pC(═NOR50)NR78R79; —(CH2)pC(═NNR78R79)NR78R79; —(CH2)pNR80C (═NR80)NR78R79; —(CH2)pN═C(NR78R80)NR79R80; —(CH2)pC6H4NR78R79; —(CH2)pC6H4NR77R80; —(CH2)pC6H4C(═NR80)NR78R79; —(CH2)pC6H4C(═NOR50)NR78R79; —(CH2)pC6H4C(═NNR78R79)NR78R79; —(CH2)pC6H4NR80C(═NR80)NR78R79; —(CH2)pC6H4N═C(NR78R80)NR79R80; —(CH2)rO(CH2)mNR78R79; —(CH2)rO(CH2)mNR77R80; —(CH2)rO(CH2)pC(═NR80)NR78R79; —(CH2)rO(CH2)pC(═NOR50)NR78R79; —(CH2)rO(CH2)pC(═NNR78R79)NR78R79; —(CH2)rO(CH2)mNR80C(═NR80)NR78R79; —(CH2)rO(CH2)mN═C(NR78R80)NR79R80; —(CH2)rO(CH2)pC6H4CNR78R79; —(CH2)rO(CH2)pC6H4C(═NR80)NR78R79; —(CH2)rO(CH2)pC6H4C(═NOR50)NR78R79; —(CH2)rO(CH2)pC6H4C(═NNR78R79)NR78R79; —(CH2)rO(CH2)pC6H4NR80C(═NR80)NR78R79; —(CH2)rS(CH2)mNR78R79; —(CH2)rS(CH2)mNR77R80; —(CH2)rS(CH2)pC(═NR80)NR78R79; —(CH2)rS(CH2)pC(═NOR50)NR78R79; —(CH2)rS(CH2)pC(═NNR78R79)NR78R79; —(CH2)rS(CH2)mNR80C(═NR80)NR78R79; —(CH2)rS(CH2)mN═C(NR78R80)NR78R80; —(CH2)rS(CH2)pC6H4CNR78R79; —(CH2)rS(CH2)pC6H4C(═NR80)NR78R79; —(CH2)rS(CH2)pC6H4C(═NOR50)NR78R79; —(CH2)rS(CH2)pC6H4C(═NNR78R79)NR78R79; —(CH2)rS(CH2)pC6H4NR80C(═NR80)NR78R79; —(CH2)pNR80COR64; —(CH2)pNR80COR77; —(CH2)pNR80CONR78R79; or —(CH2)pC6H4NR80CONR78R79;
    R75 is lower alkyl; lower alkenyl; or aryl-lower alkyl; or
    R33 and R75 taken together can form: —(CH2)2-6—; —(CH2)2O(CH2)2—; —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2—; or
    R75 and R82 taken together can form: —(CH2)2-6—; —(CH2)2O(CH2)2—; —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2—;
    R76 is H; lower alkyl; lower alkenyl; aryl-lower alkyl; —(CH2)oOR72; —(CH2)oSR72; —(CH2)oNR33R34; —(CH2)oOCONR33R75; —(CH2)oNR20CONR33R81; —(CH2)oCOOR75; —(CH2)oCONR58R59; —(CH2)oPO(OR60)2; —(CH2)pSO2R62; or —(CH2)oCOR64;
    R77 is —C6R67R68R69R70R76 with the proviso that at least two of R67, R68, R69 and R70 are H; or a heteroaryl group of one of the formulae


















    R78 is H; lower alkyl; aryl; or aryl-lower alkyl; or
    R78 and R82 taken together can form: —(CH2)2-6—; —(CH2)2O(CH2)2—; —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2—;
    R79 is H; lower alkyl; aryl; or aryl-lower alkyl; or
    R78 and R79, taken together, can be —(CH2)2-7—; —(CH2)2O(CH2)2—; or —(CH2)2NR57(CH2)2—;
    R80 is H; or lower alkyl;
    R81 is H; lower alkyl; or aryl-lower alkyl; or
    R33 and R81 taken together can form: —(CH2)2-6—; —(CH2)2O(CH2)2—; —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2—;
    R82 is H; —CF3; —OCF3; —OCHF2; lower alkyl; aryl; heteroaryl; or aryl-lower alkyl;
    R83 is H; lower alkyl; aryl; or —NR78R79;
    R84 is —(CH2)p(CHR61)sOH; —(CH2)pCOOR80; —(CH2)p(CHR61)sSH; —(CH2)pCONR78R79; —(CH2)pNR80CONR78R79; —(CH2)pC6H4CONR78R79; or —(CH2)pC6H4NR80CONR78R79;
    R85 is lower alkyl; or lower alkenyl;
    R86 is R74; —(CH2)oR77; —(CH2)o—CHR33R75; R84; —[(CH2)u—X′]t—(CH2)vNR78R79; —[(CH2)u—X′]t—(CH2)v—C(═NR80)NR78R79; —[(CH2)u—X′]t—(CH2)vOR78; —[(CH2)u—X′]t—(CH2)v—CONR78R79; —[(CH2)u—X′]t—(CH2)v—NR80CONR78R79; —[(CH2)u—X′]t—(CH2)vSR78 where X′ is —O—, —NR20—, —S—; or —OCOO—, u is 1-3, t is 1-6, and v is 1-3;
    m is 2-4; o is 0-4; p is 1-4; q is 0-2; r is 1 or 2; s is 0 or 1;
    the amino acid residue of type C is a residue of formula —NR20CH(R72)CO—;
    the amino acid residue of type D is a residue of formula —NR20CH(R73)CO—;
    the amino acid residue of type E is a residue of the formula —NR20CH(R74)CO—;
    the amino acid residue of type F is a residue of the formula —NR20CH(R84)CO—;
    the N-substituted glycine residue of type I is a residue of formula —NR86CH2CO—;
    the amino acid residue of type M is a residue of formulae —NR20CH(R72)(CH2)2CO—; —NR20CH(R73)(CH2)2CO—; —NR20CH(R74)(CH2)2CO—; or —NR20CH(R84)(CH2)2CO—,
    the amino acid residue of type N is a residue of formulae —NR20CH(R72)(CH2)CO—; —NR20CH(R73)(CH2)CO—; —NR20CH(R74)(CH2)CO—, or —NR2CH(R84)(CH2)CO—;

and pharmaceutically acceptable salts thereof.



In accordance with the present invention these β-hairpin peptidomimetics can be prepared by a process which comprises

    (a) coupling an appropriately functionalized solid support with an appropriately N-protected derivative of that amino acid which in the desired end-product corresponds to Xaan, wherein n is 16, 8, 7, 6, or 3, any functional group which may be present in said N-protected amino acid derivative being likewise appropriately protected;
    (b) removing the N-protecting group from the product thus obtained;
    (c) coupling the product thus obtained with an appropriately N-protected derivative of that amino acid which in the desired end-product corresponds to Xaan-1, any functional group which may be present in said N-protected amino acid derivative being likewise appropriately protected;
    (d) removing the N-protecting group from the product obtained in step (c);
    (e) effecting steps substantially corresponding to steps (c) and (d) using appropriately N-protected derivatives of amino acids which in the desired end-product are in positions n−2 to 1, any functional group(s) which may be present in said N-protected amino acid derivatives being likewise appropriately protected;
    (f) if n is not 16, further effecting steps substantially corresponding to steps (c) and (d) using appropriately N-protected derivatives of amino acids which in the desired end-product are in positions 16 to n+1, any functional group(s) which may be present in said N-protected amino acid derivatives being likewise appropriately protected;
    (g) forming an interstrand linkage between side-chains of Cys at positions P4 and P11; or alternatively, forming the aforesaid linkage subsequent to step (j), as described herein below;
    (h) detaching the product thus obtained from the solid support;
    (i) cyclizing the product cleaved from the solid support;
    (j) removing any protecting groups present on functional groups of any members of the chain of amino acid residues and, if desired, any protecting group(s) which may in addition be present in the molecule; and
    (k) if desired, converting the product thus obtained into a pharmaceutically acceptable salt or converting a pharmaceutically acceptable, or unacceptable, salt thus obtained into the corresponding free compound or into a different, pharmaceutically acceptable, salt.


As used in this description, the term “alkyl”, taken alone or in combinations, designates saturated, straight-chain or branched hydrocarbon radicals having up to 24, preferably up to 12, carbon atoms. Similarly, the term “alkenyl” designates straight chain or branched hydrocarbon radicals having up to 24, preferably up to 12, carbon atoms and containing at least one or, depending on the chain length, up to four olefinic double bonds. The term “lower” designates radicals and compounds having up to 6 carbon atoms. Thus, for example, the term “lower alkyl” designates saturated, straight-chain, or branched hydrocarbon radicals having up to 6 carbon atoms, such as methyl, ethyl, n-propyl, isopropyl, n-butyl, sec.-butyl, isobutyl, tert.-butyl, and the like. Similarly, the term “lower cycloalkyl” designates saturated cyclic hydrocarbon radicals having up to 6 carbon atoms, such as cyclopentyl, cyclohexyl and the like. The term “aryl” designates aromatic carbocyclic hydrocarbon radicals containing one or two six-membered rings, such as phenyl or naphthyl, which may be substituted by up to three substituents such as Br, Cl, F, CF3, NO2, lower alkyl or lower alkenyl. The term “heteroaryl” designates aromatic heterocyclic radicals containing one or two five- and/or six-membered rings, at least one of them containing up to three heteroatoms selected from the group consisting of O, S and N and said ring(s) being optionally substituted; representative examples of such optionally substituted heteroaryl radicals are indicated hereinabove in connection with the definition of R77.
The β-hairpin conformation of Cyclo (-Xaa1-Xaa2-Xaa3-Cys4-Xaa5-Xaa6-Xaa7-Xaa8-Arg9-Tyr10-Cys11-Xaa12-Xaa13-Xaa14-Xaa15-Xaa16-), disulfide bond between Cys4 and Cys11, is highly relevant for the CXCR4 antagonizing activity of the β-hairpin mimetics of the present invention. The β-hairpin stabilizing conformational properties induced by the D-amino acid residue Xaa7 and the D-amino acid or N-substituted glycine residue Xaa15 and fostered by the conserved amino acids at positions 4, 9, 10 and 11 within the sequence play a key role not only for the selective antagonizing activity but also for the synthesis process defined hereinabove, as incorporation of aforesaid residues Xaa7 and Xaa15 near the beginning or near the middle of the linear protected peptide precursors enhances cyclization yields significantly.
Building blocks A1-A69 and A105 of the structural element -A-CO— belong to a class of amino acids wherein the N-terminus is a secondary amine forming part of a ring. Among the genetically encoded amino acids only proline falls into this class. The configuration of building block A1 through A69 and A105 is (D), and they can be combined with a building block —B—CO— of (L)-configuration. Preferred combinations are -DA1-CO—LB—CO— to -DA69-CO—LB—CO— and -DA105-CO—LB—CO—. Thus, for example, DPro-LPro constitutes the prototype of such a combination.
It will be appreciated that building blocks -A1-CO— to -A69-CO— and A105-CO— in which A has (D)-configuration, are carrying a group R1 at the β-position to the N-terminus. The preferred values for R1 are H and lower alkyl with the most preferred values for R1 being H and methyl. It will be recognized by those skilled in the art, that A1-A69 and A105 are shown in (D)-configuration which, for R1 being H and methyl, corresponds to the (R)-configuration. Depending on the priority of other values for R1 according to the Cahn, Ingold and Prelog rules, this configuration may also have to be expressed as (S).
In addition to R1 building blocks -A1-CO— to -A69-CO— and A105-CO— can carry an additional substituent designated as R2 to R17. This additional substituent can be H, and if it is other than H, it is preferably a small to medium-sized aliphatic or aromatic group. Examples of preferred values for R1 to R17 are:

    
    
        —R1 is hydrogen or lower alkyl;
        —R2 is H; lower alkyl; lower alkenyl;
        
            —(CH2)pOR55 (where R55: lower alkyl; or lower alkenyl);
            —(CH2)pSR56 (where R56: lower alkyl; or lower alkenyl);
            —(CH2)pNR33R34 (where R33: lower alkyl; or lower alkenyl; R34: H; or lower alkyl; or R33 and R34 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)pOCONR33R75 (where R33: H; lower alkyl; or lower alkenyl; R75: lower alkyl; or R33 and R75 taken together form: —(CH2)2-6—); —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)pNR20CONR33R81 (where R20: H; or lower alkyl; R33: H; lower alkyl; or lower alkenyl; R81: H; or lower alkyl; or R33 and R81 taken together form: —(CH2)2-6—;
            —(CH2)2O(CH2)2—; —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oN(R20)COR64 (where R20: H; or lower alkyl; R64: lower alkyl; or lower alkenyl);
            —(CH2)oCOOR57 (where R57: lower alkyl; or lower alkenyl);
            —(CH2)oCONR58R59 (where R58: lower alkyl; or lower alkenyl; and R59: H; or lower alkyl; or R58 and R59 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oPO(OR60)2 (where R60: H; lower alkyl; or lower alkenyl);
            —(CH2)oSO2R62 (where R62: lower alkyl; or lower alkenyl);
            —(CH2)qC6H4R8 (where R8: H; F; Cl; CF3; lower alkyl; lower alkenyl; or lower alkoxy); or
            —(CH2)qCN4R81.
        
        
        —R3 is H; lower alkyl; lower alkenyl;
        
            —(CH2)mOR55 (where R55: lower alkyl; or lower alkenyl);
            —(CH2)mSR56 (where R56: lower alkyl; or lower alkenyl);
            —(CH2)mNR33R34 (where R33: lower alkyl; or lower alkenyl; R34: H; or lower alkyl; or R33 and R34 taken together form: —(CH2)2-6—; (CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)mOCONR33R75 (where R33: H; lower alkyl; or lower alkenyl; R75: lower alkyl; or R33 and R75 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)mNR20CONR33R81 (where R20: H; or lower alkyl; R33: H; lower alkyl; or lower alkenyl; R81: H; or lower alkyl; or R33 and R81 taken together form: —(CH2)2-6—;
            —(CH2)2O(CH2)2—; —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oN(R20)COR64 (where R20: H; or lower alkyl; R64 lower alkyl; or lower alkenyl);
            —(CH2)oCOOR57 (where R57: lower alkyl; or lower alkenyl);
            —(CH2)oCONR58R59 (where R58: lower alkyl; or lower alkenyl; and R59: H; or lower alkyl; or R58 and R59 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oPO(OR60)2 (where R60: lower alkyl; or lower alkenyl);
            —(CH2)oSO2R62 (where R62: lower alkyl; or lower alkenyl); or
            —(CH2)qC6H4R8 (where R8: H; F; Cl; CF3; lower alkyl; lower alkenyl; or lower alkoxy).
        
        
        —R4 is H; lower alkyl; lower alkenyl;
        
            —(CH2)mOR55 (where R55: lower alkyl; or lower alkenyl);
            —(CH2)mSR56 (where R56: lower alkyl; or lower alkenyl);
            —(CH2)mNR33R34 (where R33: lower alkyl; or lower alkenyl; R34: H; or lower alkyl; or R33 and R34 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)mOCONR33R75 (where R33: H; lower alkyl; or lower alkenyl; R75: lower alkyl; or R33 and R75 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)mNR20CONR33R81 (where R20: H; or lower alkyl; R33: H; lower alkyl; or lower alkenyl; R81: H; or lower alkyl; or R33 and R81 taken together form: —(CH2)2-6—;
            —(CH2)2O(CH2)2—; —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)mN(R20)COR64 (where R20: H; or lower alkyl; R64: lower alkyl; or lower alkenyl);
            —(CH2)oCOOR57 (where R57: lower alkyl; or lower alkenyl);
            —(CH2)oCONR58R59 (where R58: lower alkyl; or lower alkenyl; and R59: H; or lower alkyl; or R58 and R59 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oPO(OR60)2 (where R60: lower alkyl; or lower alkenyl);
            —(CH2)oSO2R62 (where R62: lower alkyl; or lower alkenyl); or
            —(CH2)qC6H4R8 (where R8: H; F; Cl; CF3; lower alkyl; lower alkenyl; or lower alkoxy).
        
        
        —R5 is lower alkyl; lower alkenyl;
        
            —(CH2)oOR55 (where R55: lower alkyl; or lower alkenyl);
            —(CH2)oSR56 (where R56: lower alkyl; or lower alkenyl);
            —(CH2)oNR33R34 (where R33: lower alkyl; or lower alkenyl; R34: H; or lower alkyl; or R33 and R34 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oOCONR33R75 (where R33: H; lower alkyl; or lower alkenyl; R75: lower alkyl; or R33 and R75 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oNR20CONR33R81 (where R20: H; or lower alkyl; R33: H; lower alkyl; or lower alkenyl; R81: H; or lower alkyl; or R33 and R84 taken together form: —(CH2)2-6—;
            —(CH2)2O(CH2)2—; —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oN(R20)COR64 (where R20: H; or lower alkyl; R64: alkyl; alkenyl; aryl; aryl-lower alkyl; or heteroaryl-lower alkyl);
            —(CH2)oCOOR57 (where R57: lower alkyl; or lower alkenyl);
            —(CH2)oCONR58R59 (where R58: lower alkyl; or lower alkenyl; and R59: H; or lower alkyl; or R58 and R59 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oPO(OR60)2 (where R60: lower alkyl; or lower alkenyl);
            —(CH2)oSO2R62 (where R62: lower alkyl; or lower alkenyl); or
            —(CH2)qC6H4R8 (where R8: H; F; Cl; CF3; lower alkyl; lower alkenyl; or lower alkoxy).
        
        
        —R6 is H; lower alkyl; lower alkenyl;
        
            —(CH2)oOR55 (where R55: lower alkyl; or lower alkenyl);
            —(CH2)oSR56 (where R56: lower alkyl; or lower alkenyl);
            —(CH2)oNR33R34 (where R33: lower alkyl; or lower alkenyl; R34: H; or lower alkyl; or R33 and R34 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oOCONR33R75 (where R33: H; lower alkyl; or lower alkenyl; R75: lower alkyl; or R33 and R75 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oNR20CONR33R81 (where R20: H; or lower alkyl; R33: H; lower alkyl; or lower alkenyl; R81: H; or lower alkyl; or R33 and R81 taken together form: —(CH2)2-6—;
            —(CH2)2O(CH2)2—; —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oN(R20)COR64 (where R20: H; or lower alkyl; R64 lower alkyl; or lower alkenyl);
            —(CH2)oCOOR57 (where R57: lower alkyl; or lower alkenyl);
            —(CH2)oCONR58R59 (where R58: lower alkyl; or lower alkenyl; and R59: H; or lower alkyl; or R58 and R59 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oPO(OR60)2 (where R60: lower alkyl; or lower alkenyl);
            —(CH2)oSO2R62 (where R62: lower alkyl; or lower alkenyl); or
            —(CH2)qC6H4R8 (where R8: H; F; Cl; CF3; lower alkyl; lower alkenyl; or lower alkoxy).
        
        
        —R7 is lower alkyl; lower alkenyl;
        
            —(CH2)qOR55 (where R55: lower alkyl; or lower alkenyl);
            —(CH2)qSR56 (where R56: lower alkyl; or lower alkenyl);
            —(CH2)qNR33R34 (where R33: lower alkyl; or lower alkenyl; R34: H; or lower alkyl; or R33 and R34 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)qOCONR33R75 (where R33: H; lower alkyl; or lower alkenyl; R75: lower alkyl; or R33 and R75 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)qNR20CONR33R81 (where R20: H; or lower alkyl; R33: H; lower alkyl; or lower alkenyl; R81: H; or lower alkyl; or R33 and R81 taken together form: —(CH2)2-6—;
            —(CH2)2O(CH2)2—; —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)qN(R20)COR64 (where R20: H; or lower alkyl; R64 lower alkyl; or lower alkenyl);
            —(CH2)rCOOR57 (where R57: lower alkyl; or lower alkenyl);
            —(CH2)rCONR58R59 (where R58: lower alkyl; or lower alkenyl; and R59: H; or lower alkyl; or R58 and R59 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)rPO(OR60)2 (where R60: lower alkyl; or lower alkenyl);
            —(CH2)rSO2R62 (where R62: lower alkyl; or lower alkenyl); or
            —(CH2)qC6H4R8 (where R8: H; F; Cl; CF3; lower alkyl; lower alkenyl; or lower alkoxy).
        
        
        —R8 is H; F; Cl; CF3; lower alkyl; lower alkenyl;
        
            —(CH2)oOR55 (where R55: lower alkyl; or lower alkenyl);
            —(CH2)oSR56 (where R56: lower alkyl; or lower alkenyl);
            —(CH2)oNR33R34 (where R33: lower alkyl; or lower alkenyl; R34: H; or lower alkyl; or R33 and R34 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oOCONR33R75 (where R33: H; lower alkyl; or lower alkenyl; R75: lower alkyl; or R33 and R75 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oNR20CONR33R81 (where R20: H; or lower alkyl; R33: H; lower alkyl; or lower alkenyl; R81: H; or lower alkyl; or R33 and R81 taken together form: —(CH2)2-6—;
            —(CH2)2O(CH2)2—; —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oN(R20)COR64 (where R20: H; or lower alkyl; R64: lower alkyl; or lower alkenyl);
            —(CH2)oCOOR57 (where R57: lower alkyl; or lower alkenyl);
            —(CH2)oCONR58R59 (where R58: lower alkyl; or lower alkenyl; and R59: H; or lower alkyl; or R58 and R59 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oPO(OR60)2 (where R60: lower alkyl; or lower alkenyl);
            —(CH2)oSO2R62 (where R62: lower alkyl; or lower alkenyl); or
            —(CH2)qC6H4R8 (where R8: H; F; Cl; CF3; lower alkyl; lower alkenyl; or lower alkoxy).
        
        
        —R9 is lower alkyl; lower alkenyl;
        
            —(CH2)oOR55 (where R55: lower alkyl; or lower alkenyl);
            —(CH2)oSR56 (where R56: lower alkyl; or lower alkenyl);
            —(CH2)oNR33R34 (where R33: lower alkyl; or lower alkenyl; R34: H; or lower alkyl; or R33 and R34 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oOCONR33R75 (where R33: H; lower alkyl; or lower alkenyl; R75: lower alkyl; or R33 and R75 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)mNR20CONR33R81 (where R20: H; or lower alkyl; R33: H; lower alkyl; or lower alkenyl; R81: H; or lower alkyl; or R33 and R80 taken together form: —(CH2)2-6—;
            —(CH2)2O(CH2)2—; —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oN(R20)COR64 (where R20: H; or lower alkyl; R64 lower alkyl; or lower alkenyl);
            —(CH2)oCOOR57 (where R57: lower alkyl; or lower alkenyl);
            —(CH2)oCONR58R59 (where R58: lower alkyl; or lower alkenyl; and R59: H; or lower alkyl; or R58 and R59 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oPO(OR60)2 (where R60: lower alkyl; or lower alkenyl);
            —(CH2)oSO2R62 (where R62: lower alkyl; or lower alkenyl); or
            —(CH2)qC6H4R8 (where R8: H; F; Cl; CF3; lower alkyl; lower alkenyl; or lower alkoxy).
        
        
        —R10 is lower alkyl; lower alkenyl;
        
            —(CH2)oOR55 (where R55: lower alkyl; or lower alkenyl);
            —(CH2)oSR56 (where R56: lower alkyl; or lower alkenyl);
            —(CH2)oNR33R34 (where R33: lower alkyl; or lower alkenyl; R34: H; or lower alkyl; or R33 and R34 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oOCONR33R75 (where R33: H; lower alkyl; or lower alkenyl; R75: lower alkyl; or R33 and R75 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oNR20CONR33R81 (where R20: H; or lower alkyl; R33: H; lower alkyl; or lower alkenyl; R81: H; or lower alkyl; or R33 and R81 taken together form: —(CH2)2-6—;
            —(CH2)2O(CH2)2—; —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oN(R20)COR64 (where R20: H; or lower alkyl; R64 lower alkyl; or lower alkenyl);
            —(CH2)oCOOR57 (where R57: lower alkyl; or lower alkenyl);
            —(CH2)oCONR58R59 (where R58: lower alkyl; or lower alkenyl; and R59: H; or lower alkyl; or R58 and R59 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oPO(OR60)2 (where R60: lower alkyl; or lower alkenyl);
            —(CH2)oSO2R62 (where R62: lower alkyl; or lower alkenyl); or
            —(CH2)qC6H4R8 (where R8: H; F; Cl; CF3; lower alkyl; lower alkenyl; or lower alkoxy).
        
        
        —R11 is H; lower alkyl; lower alkenyl;
        
            —(CH2)mOR55 (where R55: lower alkyl; or lower alkenyl);
            —(CH2)mSR56 (where R56: lower alkyl; or lower alkenyl);
            —(CH2)mNR33R34 (where R33: lower alkyl; or lower alkenyl; R34: H; or lower alkyl; or R33 and R34 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)mOCONR33R75 (where R33: H; lower alkyl; or lower alkenyl; R75: lower alkyl; or R33 and R75 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2—; (where R57: H; or lower alkyl));
            —(CH2)mNR20CONR33R81 (where R20: H; or lower alkyl; R33: H; lower alkyl; or lower alkenyl; R81: H; or lower alkyl; or R33 and R81 taken together form: —(CH2)2-6—;
            —(CH2)2O(CH2)2—; —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)mN(R20)COR64 (where R20: H; or lower alkyl; R64 lower alkyl; or lower alkenyl);
            —(CH2)oCOOR57 (where R57: lower alkyl; or lower alkenyl);
            —(CH2)oCONR58R59 (where R58: lower alkyl; or lower alkenyl; and R59: H; or lower alkyl; or R58 and R59 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oPO(OR60)2 (where R60: lower alkyl; or lower alkenyl);
            —(CH2)oSO2R62 (where R62: lower alkyl; or lower alkenyl); or
            —(CH2)qC6H4R8 (where R8: H; F; Cl; CF3; lower alkyl; lower alkenyl; or lower alkoxy).
        
        
        —R12 is H; lower alkyl; lower alkenyl;
        
            —(CH2)mOR55 (where R55: lower alkyl; or lower alkenyl);
            —(CH2)mSR56 (where R56: lower alkyl; or lower alkenyl);
            —(CH2)mNR33R34 (where R33: lower alkyl; or lower alkenyl; R34: H; or lower alkyl; or R33 and R34 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)mOCONR33R75 (where R33: H; lower alkyl; or lower alkenyl; R75: lower alkyl; or R33 and R75 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)mNR20CONR33R81 (where R20: H; or lower alkyl; R33: H; lower alkyl; or lower alkenyl; R81: H; or lower alkyl; or R33 and R81 taken together form: —(CH2)2-6—;
            —(CH2)2O(CH2)2—; —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)mN(R20)COR64 (where R20: H; or lower alkyl; R64 lower alkyl; or lower alkenyl);
            —(CH2)rCOOR57 (where R57: lower alkyl; or lower alkenyl);
            —(CH2)rCONR58R59 (where R58: lower alkyl; or lower alkenyl; and R59: H; or lower alkyl; or R58 and R59 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)rPO(OR60)2 (where R60: lower alkyl; or lower alkenyl);
            —(CH2)oSO2R62 (where R62: lower alkyl; or lower alkenyl); or
            —(CH2)qC6H4R8 (where R8: H; F; Cl; CF3; lower alkyl; lower alkenyl; or lower alkoxy).
        
        
        —R13 is lower alkyl; lower alkenyl;
        
            —(CH2)qOR55 (where R55: lower alkyl; or lower alkenyl);
            —(CH2)qSR56 (where R56: lower alkyl; or lower alkenyl);
            —(CH2)sNR33R34 (where R33: lower alkyl; or lower alkenyl; R34: H; or lower alkyl; or R33 and R34 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)qOCONR33R75 (where R33: H; lower alkyl; or lower alkenyl; R75: lower alkyl; or R33 and R75 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)qNR20CONR33R81 (where R20: H; or lower alkyl; R33: H; lower alkyl; or lower alkenyl; R81: H; or lower alkyl; or R33 and R81 taken together form: —(CH2)2-6—;
            —(CH2)2O(CH2)2—; —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)qN(R20)COR64 (where R20: H; or lower alkyl; R64 lower alkyl; or lower alkenyl);
            —(CH2)rCOO57 (where R57: lower alkyl; or lower alkenyl);
            —(CH2)qCONR58R59 (where R58: lower alkyl; or lower alkenyl; and R59: H; or lower alkyl; or R58 and R59 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)rPO(OR60)2 (where R60: lower alkyl; or lower alkenyl);
            —(CH2)rSO2R62 (where R62: lower alkyl; or lower alkenyl); or
            —(CH2)qC6H4R8 (where R8: H; F; Cl; CF3; lower alkyl; lower alkenyl; or lower alkoxy).
        
        
        —R14 is H; h lower alkyl; lower alkenyl;
        
            —(CH2)mOR55 (where R55: lower alkyl; or lower alkenyl);
            —(CH2)mSR56 (where R56: lower alkyl; or lower alkenyl);
            —(CH2)mNR33R34 (where R33: lower alkyl; or lower alkenyl; R34: H; or lower alkyl; or R33 and R34 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)mOCONR33R75 (where R33: H; lower alkyl; or lower alkenyl; R75: lower alkyl; or R33 and R75 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)mNR20CONR33R81 (where R20: H; or lower alkyl; R33: H; lower alkyl; or lower alkenyl; R81: H; or lower alkyl; or R33 and R81 taken together form: —(CH2)2-6—;
            —(CH2)2O(CH2)2—; —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)mN(R20)COR64 (where R20: H; lower alkyl; R64: lower alkyl; or lower alkenyl);
            —(CH2)oCOOR57 (where R57: lower alkyl; or lower alkenyl);
            —(CH2)oCONR58R59 (where R58: lower alkyl; or lower alkenyl; and R59: H; or lower alkyl; or R58 and R59 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oPO(OR60)2 (where R60: lower alkyl; or lower alkenyl);
            —(CH2)oSO2R62 (where R62: lower alkyl; or lower alkenyl);
            —(CH2)qC6H4R8 (where R8: H; F; Cl; CF3; lower alkyl; lower alkenyl; or lower alkoxy).
        
        
        —R15 is lower alkyl; lower alkenyl;
        
            —(CH2)oOR55 (where R55: lower alkyl; or lower alkenyl);
            —(CH2)oSR56 (where R56: lower alkyl; or lower alkenyl);
            —(CH2)oNR33R34 (where R33: lower alkyl; or lower alkenyl; R34: H; or lower alkyl; or R33 and R34 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oOCONR33R75 (where R33: H; lower alkyl; or lower alkenyl; R75: lower alkyl; or R33 and R75 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oNR20CONR33R81 (where R20: H; or lower alkyl; R33: H; lower alkyl; or lower alkenyl; R81: H; or lower alkyl; or R33 and R81 taken together form: —(CH2)2-6—;
            —(CH2)2O(CH2)2—; —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oN(R20)COR64 (where R20: H; or lower alkyl; R64 lower alkyl; or lower alkenyl); particularly favoured being —NR20CO-lower alkyl (where R20: H; or lower alkyl);
            —(CH2)oCOOR57 (where R57: lower alkyl; or lower alkenyl);
            —(CH2)oCONR58R59 (where R58: lower alkyl, or lower alkenyl; and R59: H; or lower alkyl; or R58 and R59 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oPO(OR60)2 (where R60: lower alkyl; or lower alkenyl);
            —(CH2)oSO2R62 (where R62: lower alkyl; or lower alkenyl); or
            —(CH2)qC6H4R8 (where R8: H; F; Cl; CF3; lower alkyl; lower alkenyl; or lower alkoxy).
        
        
        —R16 is lower alkyl; lower alkenyl;
        
            —(CH2)oOR55 (where R55: lower alkyl; or lower alkenyl);
            —(CH2)oSR56 (where R56: lower alkyl; or lower alkenyl);
            —(CH2)oNR33R34 (where R33: lower alkyl; or lower alkenyl; R34: H; or lower alkyl; or R33 and R34 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oOCONR33R75 (where R33: H; lower alkyl; or lower alkenyl; R75: lower alkyl; or R33 and R75 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oNR20CONR33R81 (where R20: H; or lower alkyl; R33: H; lower alkyl; or lower alkenyl; R81: H; or lower alkyl; or R33 and R81 taken together form: —(CH2)2-6—;
            —(CH2)2O(CH2)2—; —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oN(R20)COR64 (where R20: H; or lower alkyl; R64 lower alkyl; or lower alkenyl);
            —(CH2)oCOOR57 (where R57: lower alkyl; or lower alkenyl);
            —(CH2)oCONR58R59 (where R58: lower alkyl; or lower alkenyl; and R59: H; or lower alkyl; or R58 and R59 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oPO(OR60)2 (where R60: lower alkyl; or lower alkenyl);
            —(CH2)oSO2R62 (where R62: lower alkyl; or lower alkenyl); or
            —(CH2)qC6H4R8 (where R8: H; F; Cl; CF3; lower alkyl; lower alkenyl; or lower alkoxy).
        
        
        —R17 is lower alkyl; lower alkenyl;
        
            —(CH2)qOR55 (where R55: lower alkyl; or lower alkenyl);
            —(CH2)qSR56 (where R56: lower alkyl; or lower alkenyl);
            —(CH2)qNR33R34 (where R33: lower alkyl; or lower alkenyl; R34: H; or lower alkyl; or R33 and R34 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)qOCONR33R75 (where R33: H; lower alkyl; or lower alkenyl; R75: lower alkyl; or R33 and R75 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)qNR20CONR33R81 (where R20: H; or lower alkyl; R33: H; lower alkyl; or lower alkenyl; R81: H; or lower alkyl; or R33 and R81 taken together form: —(CH2)2-6—;
            —(CH2)2O(CH2)2—; —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)qN(R20)COR64 (where R20: H; or lower alkyl; R64 lower alkyl; or lower alkenyl);
            —(CH2)rCOOR57 (where R57: lower alkyl; or lower alkenyl);
            —(CH2)qCONR58R59 (where R58: lower alkyl; or lower alkenyl; and R59: H; or lower alkyl; or R58 and R59 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)rPO(OR60)2 (where R60: lower alkyl; or lower alkenyl);
            —(CH2)rSO2R62 (where R62: lower alkyl; or lower alkenyl); or
            —(CH2)qC6H4R8 (where R8: H; F; Cl; CF3; lower alkyl; lower alkenyl; or lower alkoxy).
        
        
    
    


Among the building blocks A1 to A69 and A105 the following are preferred: A5 with R2 being H, A8, A22, A25, A38 with R2 being H, A42, A47, A50 and A105. Most preferred are building blocks of type A8′:




especially those wherein R64 is n-hexyl (A8′-1); n-heptyl (A8′-2); 4-(phenyl)benzyl (A8′-3); diphenylmethyl (A8′-4); 3-amino-propyl (A8′-5); 5-amino-pentyl (A8′-6); methyl (A8′-7); ethyl (A8′-8); isopropyl (A8′-9); isobutyl (A8′-10); n-propyl (A8′-11); cyclohexyl (A8′-12); cyclohexylmethyl (A8′-13); n-butyl (A8′-14); phenyl (A8′-15); benzyl (A8′-16); (3-indolyl)methyl (A8′-17); 2-(3-indolyl)ethyl (A8′-18); (4-phenyl)phenyl (A8′-19); and n-nonyl (A8′-20).

Building block A70 belongs to the class of open-chain α-substituted α-amino acids, building blocks A71 and A72 to the corresponding β-amino acid analogues and building blocks A73-A104 to the cyclic analogues of A70. Such amino acid derivatives have been shown to constrain small peptides in well defined reverse turn or U-shaped conformations (C. M. Venkatachalam, Biopolymers 1968, 6, 1425-1434; W. Kabsch, C. Sander, Biopolymers 1983, 22, 2577). Such building blocks are ideally suited for the stabilization of β-hairpin conformations in peptide loops (D. Obrecht, M. Altorfer, J. A. Robinson, “Novel Peptide Mimetic Building Blocks and Strategies for Efficient Lead Finding”, Adv. Med. Chem. 1999, Vol. 4, 1-68; P. Balaram, “Non-standard amino acids in peptide design and protein engineering”, Curr. Opin. Struct. Biol. 1992, 2, 845-851; M. Crisma, G. Valle, C. Toniolo, S. Prasad, R. B. Rao, P. Balaram, “β-turn conformations in crystal structures of model peptides containing α.α-disubstituted amino acids”, Biopolymers 1995, 35, 1-9; V. J. Hruby, F. Al-Obeidi, W. Kazmierski, Biochem. J. 1990, 268, 249-262).
It has been shown that both enantiomers of building blocks -A70-CO— to A104-CO— in combination with a building block —B—CO— being an α-amino acid with L-configuration can efficiently stabilize and induce β-hairpin conformations (D. Obrecht, M. Altorfer, J. A. Robinson, “Novel Peptide Mimetic Building Blocks and Strategies for Efficient Lead Finding”, Adv. Med. Chem. 1999, Vol. 4, 1-68; D. Obrecht, C. Spiegler, P. Schönholzer, K. Müller, H. Heimgartner, F. Stierli, Helv. Chim. Acta 1992, 75, 1666-1696; D. Obrecht, U. Bohdal, J. Daly, C. Lehmann, P. Schönholzer, K. Müller, Tetrahedron 1995, 51, 10883-10900; D. Obrecht, C. Lehmann, C. Ruffieux, P. Schönholzer, K. Müller, Helv. Chim. Acta 1995, 78, 1567-1587; D. Obrecht, U. Bohdal, C. Broger, D. Bur, C. Lehmann, R. Ruffieux, P. Schönholzer, C. Spiegler, Helv. Chim. Acta 1995, 78, 563-580; D. Obrecht, H. Karajiannis, C. Lehmann, P. Schönholzer, C. Spiegler, Helv. Chim. Acta 1995, 78, 703-714).
Preferred values for R20 in A70 to A104 are H or lower alkyl with methyl being most preferred. Preferred values for R18, R19 and R21-R29 in building blocks A70 to A104 are the following:

    
    
        —R18 is lower alkyl.
        —R19 is lower alkyl; lower alkenyl;
        
            —(CH2)pOR55 (where R55: lower alkyl; or lower alkenyl);
            —(CH2)pSR56 (where R56: lower alkyl; or lower alkenyl);
            —(CH2)pNR33R34 (where R33: lower alkyl; or lower alkenyl; R34: H; or lower alkyl; or R33 and R34 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)pOCONR33R75 (where R33: H; lower alkyl; or lower alkenyl; R75: lower alkyl; or R33 and R75 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)pNR20CONR33R81 (where R20: H; or lower alkyl; R33: H; lower alkyl; or lower alkenyl; R81: H; or lower alkyl; or R33 and R81 taken together form: —(CH2)2-6—;
            —(CH2)2O(CH2)2—; —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)pN(R20)COR64 (where R20: H; or lower alkyl; R64 lower alkyl; or lower alkenyl);
            —(CH2)pCOOR57 (where R57: lower alkyl; or lower alkenyl);
            —(CH2)pCONR58R59 (where R58: lower alkyl; or lower alkenyl; and R59: H; or lower alkyl; or R58 and R59 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oPO(OR60)2 (where R60: lower alkyl; or lower alkenyl);
            —(CH2)pSO2R62 (where R62: lower alkyl; or lower alkenyl); or
            —(CH2)oC6H4R8 (where R8: H; F; Cl; CF3; lower alkyl; lower alkenyl; or lower alkoxy).
        
        
        —R21 is H; lower alkyl; lower alkenyl;
        
            —(CH2)oOR55 (where R55: lower alkyl; or lower alkenyl);
            —(CH2)oSR56 (where R56: lower alkyl; or lower alkenyl);
            —(CH2)oNR33R34 (where R33: lower alkyl; or lower alkenyl; R34: H; or lower alkyl; or R33 and R34 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oOCONR33R75 (where R33: H; lower alkyl; or lower alkenyl; R75: lower alkyl; or R33 and R75 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2—; (where R57: H; or lower alkyl));
            —(CH2)oNR20CONR33R81 (where R20: H; or lower alkyl; R33: H; lower alkyl; or lower alkenyl; R81: H; or lower alkyl; or R33 and R84 taken together form: —(CH2)2-6—;
            —(CH2)2O(CH2)2—; —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oN(R20)COR64 (where R20: H; or lower alkyl; R64: lower alkyl; or lower alkenyl);
            —(CH2)oCOOR57 (where R57: lower alkyl; or lower alkenyl);
            —(CH2)oCONR58R59 (where R58: lower alkyl, or lower alkenyl; and R59: H; or lower alkyl; or R58 and R59 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oPO(OR60)2 (where R60: lower alkyl; or lower alkenyl);
            —(CH2)oSO2R62 (where R62: lower alkyl; or lower alkenyl); or
            —(CH2)qC6H4R8 (where R8: H; F; Cl; CF3; lower alkyl; lower alkenyl; or lower alkoxy).
        
        
        —R22 is lower alkyl; lower alkenyl;
        
            —(CH2)oOR55 (where R55: lower alkyl; or lower alkenyl);
            —(CH2)oSR56 (where R56: lower alkyl; or lower alkenyl);
            —(CH2)oNR33R34 (where R33: lower alkyl; or lower alkenyl; R34: H; or lower alkyl; or R33 and R34 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oOCONR33R75 (where R33: H; lower alkyl; or lower alkenyl; R75: lower alkyl; or R33 and R75 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oNR20CONR33R81 (where R20: H; or lower alkyl; R33: H; lower alkyl; or lower alkenyl; R81: H; or lower alkyl; or R33 and R81 taken together form: —(CH2)2-6—;
            —(CH2)2O(CH2)2—; —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oN(R20)COR64 (where R20: H; or lower alkyl; R64 lower alkyl; or lower alkenyl);
            —(CH2)oCOOR57 (where R57: lower alkyl; or lower alkenyl);
        
        
        —(CH2)oCONR58R59 (where R58: lower alkyl, or lower alkenyl; and R59: H; or lower alkyl; or R58 and R59 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
        
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oPO(OR60)2 (where R60: lower alkyl; or lower alkenyl);
            —(CH2)oSO2R62 (where R62: lower alkyl; or lower alkenyl); or
            —(CH2)qC6H4R8 (where R8: H; F; Cl; CF; lower alkyl; lower alkenyl; or lower alkoxy).
        
        
        —R23 is H; lower alkyl; lower alkenyl;
        
            —(CH2)oOR55 (where R55: lower alkyl; or lower alkenyl);
            —(CH2)oSR56 (where R56: lower alkyl; or lower alkenyl);
            —(CH2)oNR33R34 (where R33: lower alkyl; or lower alkenyl; R34: H; or lower alkyl; or R33 and R34 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oOCONR33R75 (where R33: H; lower alkyl; or lower alkenyl; R75: lower alkyl; or R33 and R75 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oNR20CONR33R81 (where R20: H; or lower alkyl; R33H; lower alkyl; or lower alkenyl; R81: H; or lower alkyl; or R33 and R81 taken together form: —(CH2)2-6—;
            —(CH2)2O(CH2)2—; —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oN(R20)COR64 (where R20: H; or lower alkyl; R64 lower alkyl; or lower alkenyl); particularly favoured are NR20CO-lower alkyl (where R20: H; or lower alkyl);
            —(CH2)oCOOR57 (where R57: lower alkyl; or lower alkenyl);
            —(CH2)oCONR58R59 (where R58: lower alkyl, or lower alkenyl; and R59: H; or lower alkyl; or R58 and R59 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oPO(OR60)2 (where R60: lower alkyl; or lower alkenyl);
            —(CH2)oSO2R62 (where R62: lower alkyl; or lower alkenyl); or
            —(CH2)qC6H4R8 (where R8: H; F; Cl; CF3; lower alkyl; lower alkenyl; or lower alkoxy).
        
        
        —R24 is lower alkyl; lower alkenyl;
        
            —(CH2)oOR55 (where R55: lower alkyl; or lower alkenyl);
            —(CH2)oSR56 (where R56: lower alkyl; or lower alkenyl);
            —(CH2)oNR33R34 (where R33: lower alkyl; or lower alkenyl; R34: H; or lower alkyl; or R33 and R34 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oOCONR33R27 (where R33: H; lower alkyl; or lower alkenyl; R75: lower alkyl; or R33 and R75 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oNR20CONR33R81 (where R20: H; or lower alkyl; R33: H; lower alkyl; or lower alkenyl; R81: H; or lower alkyl; or R33 and R84 taken together form: —(CH2)2-6—;
            —(CH2)2O(CH2)2—; —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oN(R20)COR64 (where R20: H; or lower alkyl; R64: lower alkyl; or lower alkenyl); particularly favoured are NR20CO-lower alkyl (where R20: H; or lower alkyl);
            —(CH2)oCOOR57 (where R57: lower alkyl; or lower alkenyl);
            —(CH2)oCONR58R59 (where R58: lower alkyl, or lower alkenyl; and R59: H; or lower alkyl; or R58 and R59 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oPO(OR60)2 (where R60: lower alkyl; or lower alkenyl);
            —(CH2)oSO2R62 (where R62: lower alkyl; or lower alkenyl); or
            —(CH2)qC6H4R8 (where R8: H; F; Cl; CF3; lower alkyl; lower alkenyl; or lower alkoxy).
        
        
        —R25 is H; lower alkyl; lower alkenyl;
        
            —(CH2)mOR55 (where R55: lower alkyl; or lower alkenyl);
            —(CH2)mNR33R34 (where R33: lower alkyl; or lower alkenyl; R34: H; or lower alkyl; or R33 and R34 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)mOCONR33R75 (where R33: H; lower alkyl; or lower alkenyl; R75: lower alkyl; or R33 and R75 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)mNR20CONR33R81 (where R20: H; or lower alkyl; R33: H; lower alkyl; or lower alkenyl; R81: H; or lower alkyl; or R33 and R81 taken together form: —(CH2)2-6—;
            —(CH2)2O(CH2)2—; —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)mN(R20)COR64 (where R20: H; or lower alkyl; R64 lower alkyl; or lower alkenyl);
            —(CH2)oCOOR57 (where R57: lower alkyl; or lower alkenyl);
            —(CH2)oCONR58R59 (where R58: lower alkyl; or lower alkenyl; and R59: H; or lower alkyl; or R58 and R59 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oPO(OR60)2 (where R60: lower alkyl; or lower alkenyl);
            —(CH2)oSO2R62 (where R62: lower alkyl; or lower alkenyl); or
            —(CH2)qC6H4R8 (where R8: H; F; Cl; CF3; lower alkyl; lower alkenyl; or lower alkoxy).
        
        
        —R26 is H; lower alkyl; lower alkenyl;
        
            —(CH2)mOR55 (where R55: lower alkyl; or lower alkenyl);
            —(CH2)mNR33R34 (where R33: lower alkyl; or lower alkenyl; R34: H; or lower alkyl; or R33 and R34 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)mOCONR33R75 (where R33: H; lower alkyl; or lower alkenyl; R75: lower alkyl; or R33 and R75 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)mNR20CONR33R81 (where R20: H; or lower alkyl; R33: H; lower alkyl; or lower alkenyl; R81: H; or lower alkyl; or R33 and R81 taken together form: —(CH2)2-6—;
            —(CH2)2O(CH2)2—; —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)mN(R20)COR64 (where R20: H; or lower alkyl; R64 lower alkyl; or lower alkenyl);
            —(CH2)oCOOR57 (where R57: lower alkyl; or lower alkenyl);
            —(CH2)oCONR58R59 (where R58: lower alkyl; or lower alkenyl; and R59: H; or lower alkyl; or R58 and R59 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oPO(OR60)2 (where R60: lower alkyl; or lower alkenyl);
            —(CH2)oSO2R62 (where R62: lower alkyl; or lower alkenyl); or
            —(CH2)qC6H4R8 (where R8: H; F; Cl; CF3; lower alkyl; lower alkenyl; or lower alkoxy); or, alternatively,
        
        
        —R25 and R26 taken together are —(CH2)2-6—; —(CH2)2O(CH2)2—; —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl).
        —R27 is H; lower alkyl; lower alkenyl;
        
            —(CH2)oOR55 (where R55: lower alkyl; or lower alkenyl);
            —(CH2)oSR56 (where R56: lower alkyl; or lower alkenyl);
            —(CH2)oNR33R34 (where R33: lower alkyl; or lower alkenyl; R34: H; or lower alkyl; or R33 and R34 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oOCONR33R73 (where R33: H; lower alkyl; or lower alkenyl; R75: lower alkyl; or R33 and R75 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oNR20CONR33R81 (where R20: H; or lower alkyl; R33: H; lower alkyl; or lower alkenyl; R81: H; or lower alkyl; or R33 and R81 taken together form: —(CH2)2-6—;
            —(CH2)2O(CH2)2—; —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oN(R22)COR64 (where R20: H; or lower alkyl; R64 lower alkyl; or lower alkenyl);
            —(CH2)oCOOR57 (where R57: lower alkyl; or lower alkenyl);
            —(CH2)oCONR58R59 (where R58: lower alkyl, or lower alkenyl; and R59: H; or lower alkyl; or R58 and R59 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oPO(OR60)2 (where R60: lower alkyl; or lower alkenyl);
            —(CH2)oSO2R62 (where R62: lower alkyl; or lower alkenyl); or
            —(CH2)qC6H4R8 (where R8: H; F; Cl; CF3; lower alkyl; lower alkenyl; or lower alkoxy).
        
        
        —R28 is lower alkyl; lower alkenyl;
        
            —(CH2)oOR55 (where R55: lower alkyl; or lower alkenyl);
            —(CH2)oSR56 (where R56: lower alkyl; or lower alkenyl);
            —(CH2)oNR33R34 (where R33: lower alkyl; or lower alkenyl; R34: H; or lower alkyl; or R33 and R34 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oOCONR33R75 (where R33: H; lower alkyl; or lower alkenyl; R75: lower alkyl; or R33 and R75 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH 2)oNR20CONR33R81 (where R20: H; or lower alkyl; R33: H; lower alkyl; or lower alkenyl; R81: H; or lower alkyl; or R33 and R81 taken together form: —(CH2)2-6—;
            —(CH2)2O(CH2)2—; —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oN(R20)COR64 (where R20: H; or lower alkyl; R64 lower alkyl; or lower alkenyl);
            —(CH2)oCOOR57 (where R57: lower alkyl; or lower alkenyl);
            —(CH2)oCONR58R59 (where R58: lower alkyl, or lower alkenyl; and R59: H; or lower alkyl; or R58 and R59 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oPO(OR60)2 (where R60: lower alkyl; or lower alkenyl);
            —(CH2)oSO2R62 (where R62: lower alkyl; or lower alkenyl); or
            —(CH2)qC6H4R8 (where R8: H; F; Cl; CF3; lower alkyl; lower alkenyl; or lower alkoxy).
        
        
        —R29 is lower alkyl; lower alkenyl;
        
            —(CH2)oOR55 (where R55: lower alkyl; or lower alkenyl);
            —(CH2)oSR56 (where R56: lower alkyl; or lower alkenyl);
            —(CH2)oNR33R34 (where R33: lower alkyl; or lower alkenyl; R34: H; or lower alkyl; or R33 and R34 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oOCONR33R75 (where R33: H; lower alkyl; or lower alkenyl; R75: lower alkyl; or R33 and R75 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oNR20CONR33R81 (where R20: H; or lower alkyl; R33: H; lower alkyl; or lower alkenyl; R81: H; or lower alkyl; or R33 and R81 taken together form: —(CH2)2-6—;
            —(CH2)2O(CH2)2—; —(CH2)2S(CH2)2—; or —(CH2)2NR57(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oN(R20)COR64 (where R20: H; or lower alkyl; R64 lower alkyl; or lower alkenyl); particularly favored are NR20CO-lower-alkyl (where R20: H; or lower alkyl);
            —(CH2)oCOOR57 (where R57: lower alkyl; or lower alkenyl);
            —(CH2)oCONR58R59 (where R58: lower alkyl, or lower alkenyl; and R59: H; or lower alkyl; or R58 and R59 taken together form: —(CH2)2-6—; —(CH2)2O(CH2)2—;
            —(CH2)2S(CH2)2—; or —(CH2)2NR11(CH2)2— (where R57: H; or lower alkyl));
            —(CH2)oPO(OR60)2 (where R60: lower alkyl; or lower alkenyl);
            —(CH2)oSO2R62 (where R62: lower alkyl; or lower alkenyl); or
            —(CH2)qC6H4R8 (where R8: H; F; Cl; CF3; lower alkyl; lower alkenyl; or lower alkoxy).
        
        
    
    


Among the building blocks A70 to A104 the following are preferred: A74 with R22 being H, A75, A76, A77 with R22 being H, A78 and A79.
The building block —B—CO— designates an L-amino acid residue. Preferred values for B are: —NR20CH(R71)—, enantiomers of groups A5 with R2 being H, A8, A22, A25, A38 with R2 being H, A42, A47, A50, and A105. Most preferred building blocks —B—CO— are

    Ala L-Alanine
    Arg L-Arginine
    Asn L-Asparagine
    Asp L-Aspartic acid
    Cys L-Cysteine
    Gln L-Glutamine
    Glu L-Glutamic acid
    Gly Glycine
    His L-Histidine
    Ile L-Isoleucine
    Leu L-Leucine
    Lys L-Lysine
    Met L-Methionine
    Phe L-Phenylalanine
    Pro L-Proline
    Ser L-Serine
    Thr L-Threonine
    Trp L-Tryptophan
    Tyr L-Tyrosine
    Val L-Valine
    Cit L-Citrulline
    Orn L-Ornithine
    tBuA L-t-Butylalanine
    Sar Sarcosine
    t-BuG L-tert.-Butylglycine
    4AmPhe L-para-Aminophenylalanine
    3AmPhe L-meta-Aminophenylalanine
    2AmPhe L-ortho-Aminophenylalanine
    Phe(mC(NH2)═NH) L-meta-Amidinophenylalanine
    Phe(pC(NH2)═NH) L-para-Amidinophenylalanine
    Phe(mNHC(NH2)═NH) L-meta-Guanidinophenylalanine
    Phe(pNHC(NH2)═NH) L-para-Guanidinophenylalanine
    Phg L-Phenylglycine
    Cha L-Cyclohexylalanine
    C4al L-3-Cyclobutylalanine
    C5al L-3-Cyclopentylalanine
    Nle L-Norleucine
    2-Nal L-2-Naphthylalanine
    1-Nal L-1-Naphthylalanine
    4Cl-Phe L-4-Chlorophenylalanine
    3Cl-Phe L-3-Chlorophenylalanine
    2Cl-Phe L-2-Chlorophenylalanine
    3,4Cl2−Phe L-3,4-Dichlorophenylalanine
    4F-Phe L-4-Fluorophenylalanine
    3F-Phe L-3-Fluorophenylalanine
    2F-Phe L-2-Fluorophenylalanine
    Tic L-1,2,3,4-Tetrahydroisoquinoline-3-carboxylic acid
    Thi L-β-2-Thienylalanine
    Tza L-2-Thiazolylalanine
    Mso L-Methionine sulfoxide
    AcLys L-N-Acetyllysine
    Dpr L-2,3-Diaminopropionic acid
    A2Bu L-2,4-Diaminobutyric acid
    Dbu (2S,3S)-2,3-Diaminobutyric acid
    Abu γ-Aminobutyric acid (GABA)
    Aha ε-Aminohexanoic acid
    Aib α-Aminoisobutyric acid
    Tyr(Bzl) L-O-Benzyltyrosine
    Bip L-Biphenylalanine
    Ser(Bzl) L-O-Benzylserine
    Thr(Bzl) L-O-Benzylthreonine
    hCha L-Homo-cyclohexylalanine
    hCys L-Homo-cysteine
    hSer L-Homo-serine
    hArg L-Homo-arginine
    hPhe L-Homo-phenylalanine
    Bpa L-4-Benzoylphenylalanine
    Pip L-Pipecolic acid
    OctG L-Octylglycine
    MePhe L-N-Methylphenylalanine
    MeNle L-N-Methylnorleucine
    MeAla L-N-Methylalanine
    MeIle L-N-Methylisoleucine
    MeVal L-N-Methyaline
    MeLeu L-N-Methylleucine
    4Hyp1 (4S)-L-Hydroxyproline
    4Hyp2 (4R)-L-Hydroxyproline
    4 Mp1 (4S)-L-Mercaptoproline
    4 Mp2 (4R)-L-Mercaptoproline
    Oic (3aS, 7aS)-L-1-Octahydro-1H-indole-2-carboxylic acid


In addition, the most preferred values for B also include groups of type A8′′ of (L)-configuration:




wherein R20 is H or lower alkyl and R64 is alkyl; alkenyl; —[(CH2)u—X]t—CH3 (where X is —O—; —NR20—, or —S—; u=1-3, and t=1-6), aryl; aryl-lower alkyl; or heteroaryl-lower alkyl; especially those wherein R64 is n-hexyl (A8′′-21); n-heptyl (A8′′-22); 4-(phenyl)benzyl (A8′′-23); diphenylmethyl (A8′′-24); 3-amino-propyl (A8′′-25); 5-amino-pentyl (A8′′-26); methyl (A8′′-27); ethyl (A8′′-28); isopropyl (A8′′-29); isobutyl (A8′′-30); n-propyl (A8′′-31); cyclohexyl (A8′′-32); cyclohexyl-methyl (A8′′-33); n-butyl (A8′′-34); phenyl (A8′′-35); benzyl (A8′′-36); (3-indolyl)methyl (A8′′-37); 2-(3-indolyl)ethyl (A8′′-38); (4-phenyl)-phenyl (A8′′-39); n-nonyl (A8′′-40); CH3—OCH2CH2—OCH2— (A8′′-41) and CH3—(OCH2CH2)2—OCH2— (A8′′-42).

Besides the structural element —B—CO— the β-hairpin peptidomimetics of the present invention can comprise the structural element -A-CO— and amino acid residues belonging to one of the following groups:

    
    
        Group C —NR20CH(R22)CO—; “hydrophobic: small to medium-sized”
        Group D —NR20CH(R73)CO—; “hydrophobic: large aromatic or heteroaromatic”
        Group E —NR20CH(R74)CO—; “polar-cationic” and “urea-derived”
        Group F —NR20CH(R84)CO—; “polar-non-charged or anionic”
        Group I —NR86CH2CO—;
        Group M —NR20CH(R72)(CH2)2CO—; —NR20CH(R73)(CH2)2CO—; —NR20CH(R74)(CH2)2CO—; or —NR20CH(R84)(CH2)2CO—; “γ4-amino acids”
        Group N —NR20CH(R72)(CH2)CO—; —NR20CH(R73)(CH2)CO—; —NR20CH(R74)(CH2)CO—, or —NR20CH(R84)(CH2)CO—; “β3-amino acids”
    
    


Group C comprises amino acid residues with small to medium-sized hydrophobic side chain groups according to the general definition for substituent R72. A hydrophobic residue refers to an amino acid side chain that is uncharged at physiological pH and that is repelled by aqueous solution. Furthermore these side chains generally do not contain hydrogen bond donor groups, such as (but not limited to) primary and secondary amides, primary and secondary amines and the corresponding protonated salts thereof, thiols, alcohols, phosphonates, phosphates, ureas or thioureas. However, they may contain hydrogen bond acceptor groups such as ethers, thioethers, esters, tertiary amides, alkyl- or aryl phosphonates and phosphates or tertiary amines. Genetically encoded small-to-medium-sized hydrophobic amino acids include alanine, isoleucine, leucine, methionine and valine.
Group D comprises amino acid residues with aromatic and heteroaromatic side chain groups according to the general definition for substituent R73. An aromatic amino acid residue refers to a hydrophobic amino acid having a side chain containing at least one ring having a conjugated π-electron system (aromatic group). In addition they may contain hydrogen bond donor groups such as (but not limited to) primary and secondary amides, primary and secondary amines and the corresponding protonated salts thereof, thiols, alcohols, phosphonates, phosphates, ureas or thioureas, and hydrogen bond acceptor groups such as (but not limited to) ethers, thioethers, esters, tetriary amides, alkyl- or aryl phosphonates- and phosphates or tertiary amines. Genetically encoded aromatic amino acids include phenylalanine and tyrosine.
A heteroaromatic amino acid residue refers to a hydrophobic amino acid having a side chain containing at least one ring having a conjugated π-system incorporating at least one heteroatom such as (but not limited to) O, S and N according to the general definition for substituent R77. In addition such residues may contain hydrogen bond donor groups such as (but not limited to) primary and secondary amides, primary and secondary amines and the corresponding protonated salts thereof, thiols, alcohols, phosphonates, phosphates, ureas or thioureas, and hydrogen bond acceptor groups such as (but not limited to) ethers, thioethers, esters, tetriary amides, alkyl- or aryl phosphonates- and phosphates or tertiary amines. Genetically encoded heteroaromatic amino acids include tryptophan and histidine.
Group E comprises amino acids containing side chains with polar-cationic, acylamino- and urea-derived residues according to the general definition for substituent R74. Polar-cationic refers to a basic side chain which is protonated at physiological pH. Genetically encoded polar-cationic amino acids include arginine, lysine and histidine. Citrulline is an example for an urea derived amino acid residue.
Group F comprises amino acids containing side chains with polar-non-charged or anionic residues according to the general definition for substituent R84. A polar-non-charged or anionic residue refers to a hydrophilic side chain that is uncharged and, respectively anionic at physiological pH (carboxylic acids being included), but that is not repelled by aqueous solutions. Such side chains typically contain hydrogen bond donor groups such as (but not limited to) primary and secondary amides, carboxyclic acids and esters, primary and secondary amines, thiols, alcohols, phosphonates, phosphates, ureas or thioureas. These groups can form hydrogen bond networks with water molecules. In addition they may also contain hydrogen bond acceptor groups such as (but not limited to) ethers, thioethers, esters, tetriary amides, carboxylic acids and carboxylates, alkyl- or aryl phosphonates- and phosphates or tertiary amines. Genetically encoded polar-non-charged amino acids include asparagine, cysteine, glutamine, serine and threonine, but also aspartic acid and glutamic acid.
Group I comprises glycine having the amino group substituted by chains containing polar-cationic, hydrophobic, aromatic, heteroaromatic, polar-non-charged or anionic residues according to the general definition for substituent R86. Polar-cationic refers to a basic side chain which is protonated at physiological pH. A hydrophobic residue refers to an amino acid side chain that is uncharged at physiological pH and that is repelled by aqueous solution. Aromatic refers to a hydrophobic side chain containing at least one ring having a conjugated π-electron system (aromatic group). Heteroaromatic refers to a hydrophobic side chain containing at least one ring having a conjugated π-system incorporating at least one heteroatom. A polar-non-charged or anionic residue refers to a hydrophilic side chain that is uncharged and, respectively anionic at physiological pH (carboxylic acids being included), but that is not repelled by aqueous solutions.
Group M comprises γ4-amino acid residues having both the amino group and the side chain attached to the γ-carbon atom with side chain groups according to the general definition for substituent R71; γ4-amino acid residues with small to medium-sized hydrophobic side chain groups according to the general definition for substituent R72; γ4-amino acid residues with aromatic and heteroaromatic side chain groups according to the general definition for substituent R73; γ4-amino acid residues with polar-cationic, acylamino- and urea-derived side chain groups according to the general definition for substituent R74; and γ4-amino acid residues with polar-non-charged or anionic groups according to the general definition for substituent R84. Hydrophobic side chain groups are uncharged at physiological pH and repelled by aqueous solution. An aromatic side chain group is hydrophobic and contains at least one ring having a conjugated π-electron system (aromatic group). A heteroaromatic side chain group is hydrophobic and contains at least one ring having a conjugated π-system incorporating at least one heteroatom such as (but not limited to) O, S and N according to the general definition for substituent R77. A polar-cationic side chain group refers to a basic side chain which is protonated at physiological pH. A polar-non-charged or anionic side chain group is uncharged and, respectively anionic at physiological pH (carboxylic acids being included), but is not repelled by aqueous solutions.
Group N comprises β3-amino acid residues having both the amino group and the side chain attached to the β-carbon atom with side chain groups according to the general definition for substituent R71; β3-amino acid residues with small to medium-sized hydrophobic side chain groups according to the general definition for substituent R72; β3-amino acid residues with aromatic and heteroaromatic side chain groups according to the general definition for substituent R73; β3-amino acid residues with polar-cationic, acylamino- and urea-derived side chain groups according to the general definition for substituent R74; and β3-amino acid residues with polar-non-charged or anionic groups according to the general definition for substituent R84. Hydrophobic side chain groups are uncharged at physiological pH and repelled by aqueous solution. An aromatic side chain group is hydrophobic and contains at least one ring having a conjugated π-electron system (aromatic group). A heteroaromatic side chain group is hydrophobic and contains at least one ring having a conjugated π-system incorporating at least one heteroatom such as (but not limited to) O, S and N according to the general definition for substituent R77. A polar-cationic side chain group refers to a basic side chain which is protonated at physiological pH. A polar-non-charged or anionic side chain group is uncharged and, respectively anionic at physiological pH (carboxylic acids being included), but is not repelled by aqueous solutions.
As mentioned earlier, the β-hairpin peptidomimetics of the invention contain a disulfide bond between Cys4 and Cys11. Such an interstrand linkage is known to stabilize the β-hairpin conformations and thus constitute an important structural element for the design of β-hairpin mimetics.
Most preferred amino acid residues in Cyclo(-Xaa1-Xaa2-Xaa3-Cys4-Xaa5-Xaa6-Xaa7-Xaa8-Arg9-Tyr10-Cys11-Xaa12-Xaa13-Xaa14-Xaa15-Xaa16-), disulfide bond between Cys4 and Cys11, are those derived from natural α-, β- and γ-amino acids. Hereinafter follows a list of amino acids which, or the residues of which, are suitable for the purposes of the present invention, the abbreviations corresponding to generally adopted usual practice:














three letter code
one letter code




















Ala
L-Alanine
A



DAla
D-Alanine
DA



Arg
L-Arginine
R



DArg
D-Arginine
DR



Asn
L-Asparagine
N



DAsn
D-Asparagine
DN



Asp
L-Aspartic acid
D



DAsp
D-Aspartic acid
DD



Cys
L-Cysteine
C



DCys
D-Cysteine
DC



Glu
L-Glutamic acid
E



DGlu
D-Glutamic acid
DE



Gln
L-Glutamine
Q



DGln
D-Glutamine
DQ



Gly
Glycine
G



His
L-Histidine
H



DHis
D-Histidine
DH



Ile
L-Isoleucine
I



DIle
D-Isoleucine
DI



Leu
L-Leucine
L



DLeu
D-Leucine
DL



Lys
L-Lysine
K



DLys
D-Lysine
DK



Met
L-Methionine
M



DMet
D-Methionine
DM



Phe
L-Phenylalanine
F



DPhe
D-Phenylalanine
DF



Pro
L-Proline
P



DPro
D-Proline
DP



Ser
L-Serine
S



DSer
D-Serine
DS



Thr
L-Threonine
T



DThr
D-Threonine
DT



Trp
L-Tryptophan
W



DTrp
D-Tryptophan
DW



Tyr
L-Tyrosine
Y



DTyr
D-Tyrosine
DY



Val
L-Valine
V



DVal
D-Valine
DV










3-Amino-propanoic acid


    H-β3-HAla-OH (3S)-3-Amino-butyric acid
    H-β3-HVal-OH (3R)-3-Amino-4-methyl-valeric acid
    H-β3-HIle-OH (3R,4S)-3-Amino-4-methyl-hexanoic acid
    H-β3-HLeu-OH (3S)-3-Amino-5-methyl-hexanoic acid
    H-β3-HMet-OH (3S)-3-Amino-5-methylthio-pentanoic acid
    H-β3-HTyr-OH (3S)-3-Amino-4-(4′-hydroxyphenyl)-butyric acid
    H-β3-HHis-OH (3S)-3-Amino-4-(imidazole-4′-yl)-butyric acid
    H-β3-HPhe-OH (3S)-3-Amino-4-phenyl-butyric acid
    H-β3-HTrp-OH (3S)-3-Amino-4-(indol-3′-yl)-butyric acid
    H-β3-HSer-OH (3R)-3-Amino-4-hydroxy-butyric acid
    H-β3-HAsp-OH 3-Amino-pentanedioic acid
    H-β3-HGlu-OH (3S)-3-Amino-hexanedioic acid
    H-β3-HLys-OH (3S)-3,7-Diamino-heptanoic acid
    H-β3-HArg-OH (3S)-3-Amino-6-guanidino-hexanoic-acid
    H-β3-HCys-OH (3R)-3-Amino-4-mercapto-butyric acid
    H-β3-HAsn-OH (3S)-3-Amino-4-carbamoyl-butyric acid
    H-β3-HGln-OH (3S)-3-Amino-5-carbamoyl-pentanoic acid
    H-β3-HThr-OH (3R,4R)-3-Amino-4-hydroxy-pentanoic acid


4-Amino-butyric acid


    H-γ4-DiHAla-OH (4S)-4-Amino-pentanoic acid
    H-γ4-DiHVal-OH (4R)-4-Amino-5-methyl-hexanoic acid
    H-γ4-DiHIle-OH (4R,5S)-4-Amino-5-methyl-heptanoic acid
    H-γ4-DiHLeu-OH (4R)-4-Amino-6-methyl-heptanoic acid
    H-γ4-DiHMet-OH (4R)-4-Amino-6-methylthio-hexanoic acid
    H-γ4-DiHTyr-OH (4R)-4-Amino-5-(4′-hydroxyphenyl)-pentanoic acid
    H-γ4-DiHHis-OH (4R)-4-Amino-5-(imidazole-4′-yl)-pentanoic acid
    H-γ4-DiHPhe-OH (4R)-4-Amino-5-phenyl-pentanoic acid
    H-γ4-DiHTrp-OH (4R)-4-Amino-5-(indol-3′-yl)-pentanoic acid
    H-γ4-DiHSer-OH (4R)-4-Amino-5-hydroxy-pentanoic acid
    H-γ4-DiHAsp-OH (4R)-4-Amino-hexanedioic acid
    H-γ4-DiHGlu-OH 4-Amino-heptanedioic acid
    H-γ4-DiHLys-OH (4S)-4,8-Diamino-octanoic acid
    H-γ4-DiHArg-OH (4S)-4-Amino-7-guanidino-heptanoic-acid
    H-γ4-DiHCys-OH (4R)-4-Amino-5-mercapto-pentanoic acid
    H-γ4-DiHAsn-OH (4R)-4-Amino-5-carbamoyl-pentanoic acid
    H-γ4-DiHGln-OH (3S)-3-Amino-5-carbamoyl-hexanoic acid
    H-γ4-DiHThr-OH (4R,5R)-4-Amino-5-hydroxy-hexanoic acid


Other α-, β- and γ-amino acids which, or the residues of which, are suitable for the purposes of the present invention include:

    Cit L-Citrulline
    DCit D-Citrulline
    Orn L-Ornithine
    DOrn D-Ornithine
    tBuA L-t-Butylalanine
    DtBuA D-t-Butylalanine
    Sar Sarcosine
    Pen L-Penicillamine
    DPen D-Penicillamine
    tBuG L-tert.-Butylglycine
    DtBuG D-tert.-Butylglycine
    4AmPhe L-para-Aminophenylalanine
    D4AmPhe D-para-Aminophenylalanine
    3AmPhe L-meta-Aminophenylalanine
    D3AmPhe D-meta-Aminophenylalanine
    2AmPhe L-ortho-Aminophenylalanine
    D2AmPhe D-ortho-Aminophenylalanine
    Phe(mC(NH2)═NH) L-meta-Amidinophenylalanine
    DPhe(mC(NH2)═NH) D-meta-Amidinophenylalanine
    Phe(pC(NH2)═NH) L-para-Amidinophenylalanine
    DPhe(pC(NH2)═NH) D-para-Amidinophenylalanine
    Phe(mNHC(NH2)═NH) L-meta-Guanidinophenylalanine
    DPhe(mNHC(NH2)═NH) D-meta-Guanidinophenylalanine
    Phe(pNHC(NH2)═NH) L-para-Guanidinophenylalanine
    DPhe(pNHC(NH2)═NH) D-para-Guanidinophenylalanine
    2 Pal (2S)-2-Amino-3-(pyridine-2′-yl)-propionic acid
    D2 Pal (2R)-2-Amino-3-(pyridine-2′-yl)-propionic acid
    4 Pal (2S)-2-Amino-3-(pyridine-4′-yl)-propionic acid
    D4 Pal (2R)-2-Amino-3-(pyridine-4′-yl)-propionic acid
    Phg L-Phenylglycine
    DPhg D-Phenylglycine
    Cha L-Cyclohexylalanine
    DCha D-Cyclohexylalanine
    C4al L-3-Cyclobutylalanine
    DC4al D-3-Cyclobutylalanine
    C5al L-3-Cyclopentylalanine
    DC5al D-3-Cyclopentylalanine
    Nle L-Norleucine
    DNle D-Norleucine
    2-Nal L-2-Naphthylalanine
    D2Nal D-2-Naphthylalanine
    1-Nal L-1-Naphthylalanine
    D1Nal D-1-Naphthylalanine
    4ClPhe L-4-Chlorophenylalanine
    D4ClPhe D-4-Chlorophenylalanine
    3ClPhe L-3-Chlorophenylalanine
    D3ClPhe D-3-Chlorophenylalanine
    2ClPhe L-2-Chlorophenylalanine
    D2ClPhe D-2-Chlorophenylalanine
    3,4Cl2Phe L-3,4-Dichlorophenylalanine
    D3,4Cl2Phe D-3,4-Dichlorophenylalanine
    4FPhe L-4-Fluorophenylalanine
    D4FPhe D-4-Fluorophenylalanine
    3FPhe L-3-Fluorophenylalanine
    D3FPhe D-3-Fluorophenylalanine
    2FPhe L-2-Fluorophenylalanine
    D2FPhe D-2-Fluorophenylalanine
    Thi L-β-2-Thienylalanine
    DThi D-β-2-Thienylalanine
    Tza L-2-Thiazolylalanine
    DTza D-2-Thiazolylalanine
    Mso L-Methionine sulfoxide
    DMso D-Methionine sulfoxide
    AcLys N-Acetyllysine
    DAcLys N-Acetyl-D-lysine
    Dpr 2,3-Diaminopropionic acid
    DDpr D-2,3-Diaminopropionic acid
    A2Bu 2,4-Diaminobutyric acid
    DA2BU (2R)-2,4-Diaminobutyric acid
    Dab L-2,4-Diaminobutyric acid
    DDab D-2,4-Diaminobutyric acid
    Dbu (2S)-2,3-Diamino-butyric acid
    DDbu (2R)-2,3-Diamino-butyric acid
    Abu γ-Aminobutyric acid (GABA)
    Aha ε-Aminohexanoic acid
    Aib α-Aminoisobutyric acid
    Cyp 1-Amino cyclopentane carboxylic acid
    Tyr(Bzl) L-O-Benzyltyrosine
    DTyr(Bzl) D-O-Benzyltyrosine
    His(Bzl) (3S)-2-Amino-3-(1′-benzylimidazole-4′-yl)-propionic acid
    DHis(Bzl) (3R)-2-Amino-3-(1′-benzylimidazole-4′-yl)-propionic acid
    Bip L-(4-phenyl)phenylalanine
    DBip D-(4-phenyl)phenylalanine
    Ser(Bzl) L-O-Benzylserine
    DSer(Bzl) D-O-Benzylserine
    Thr(Bzl) L-O-Benzylthreonine
    DThr(Bzl) D-O-Benzylthreonine
    alloT (2S,3S)-2-Amino-3-hydroxy-butyric acid
    DalloT (2R,3S)-2-Amino-3-hydroxy-butyric acid
    Leu3OH (2S,3R)-2-Amino-3-hydroxy-4-methyl-pentanoic acid
    DLeu3OH (2R,3R)-2-Amino-3-hydroxy-4-methyl-pentanoic acid
    hAla L-Homo-alanine
    DhAla D-Homo-alanine
    hArg L-Homo-arginine
    DhArg D-Homo-arginine
    hCys L-Homo-cysteine
    DhCys D-Homo-cysteine
    hGlu L-Homo-glutamic acid
    DhGlu D-glutamic acid
    hGln L-Homo-glutamine
    DhGln D-Homo-glutamine
    hHis L-Homo-histidine
    DhHis D-Homo-histidine
    hIle L-Homo-isoleucine
    DhIle D-Homo-isoleucine
    hLeu L-Homo-leucine
    DhLeu D-Homo-leucine
    hNle L-Homo-norleucine
    DhNle D-Homo-norleucine
    hLys L-Homo-lysine
    DhLys D-Homo-lysine
    hMet L-Homo-Methionine
    DhMet D-Homo-Methionine
    hPhe L-Homo-phenylalanine
    DhPhe D-Homo-phenylalanine
    hSer L-Homo-serine
    DhSer D-Homo-serine
    hThr L-Homo-threonine
    DhThr D-Homo-threonine
    hTrp L-Homo-tryptophan
    DhTrp D-Homo-tryptophan
    hTyr L-Homo-tyrosine
    DhTyr D-Homo-tyrosine
    hVal L-Homo-valine
    DhVal D-Homo-valine
    hCha L-Homo-cyclohexylalanine
    DhCha D-Homo-cyclohexylalanine
    Bpa L-4-Benzoylphenylalanine
    DBpa D-4-Benzoylphenylalanine
    OctG L-Octylglycine
    DOctG D-Octylglycine
    Tic (3S)-1,2,3,4-Tetrahydroisoquinoline-3-carboxylic acid
    DTic (3R)-1,2,3,4-Tetrahydroisoquinoline-3-carboxylic acid
    Tiq (1S)-1,2,3,4-Tetrahydroisoquinoline-1-carboxylic acid
    DTiq (1R)-1,2,3,4-Tetrahydroisoquinoline-1-carboxylic acid
    Oic (2S,3aS, 7aS)-1-Octahydro-1H-indole-2-carboxylic acid
    DOic (2R, 3aS, 7aS)-1-Octahydro-1H-indole-2-carboxylic acid
    4AmPyrrl (2S,4S)-4-Amino-pyrrolidine-2-carboxylic acid
    D4AmPyrr1 (2R,4S)-4-Amino-pyrrolidine-2-carboxylic acid
    4AmPyrr2 (2S,4R)-4-Amino-pyrrolidine-2-carboxylic acid
    D4AmPyrr2 (2R,4R)-4-Amino-pyrrolidine-2-carboxylic acid
    4PhePyrr1 (2S,4R)-4-Phenyl-pyrrolidine-2-carboxylic acid
    D4PhePyrr1 (2R,4R)-4-Phenyl-pyrrolidine-2-carboxylic acid
    4PhePyrr2 (2S,4S)-4-Phenyl-pyrrolidine-2-carboxylic acid
    D4PhePyrr2 (2R,4S)-4-Phenyl-pyrrolidine-2-carboxylic acid
    5PhePyrr1 (2S,5R)-5-Phenyl-pyrrolidine-2-carboxylic acid
    D5PhePyrr1 (2R,5R)-5-Phenyl-pyrrolidine-2-carboxylic acid
    5PhePyrr2 (2S,5S)-5-Phenyl-pyrrolidine-2-carboxylic acid
    D5PhePyrr2 (2R,5S)-5-Phenyl-pyrrolidine-2-carboxylic acid
    4Hyp1 (4S)-L-Hydroxyproline
    D4Hyp1 (4S)-D-Hydroxyproline
    4Hyp2 (4R)-L-Hydroxyproline
    D4Hyp2 (4R)-D-Hydroxyproline
    4 Mp1 (4S)-L-Mercaptoproline
    D4 Mp1 (4S)-D-Mercaptoproline
    4 Mp2 (4R)-L-Mercaptoproline
    D4 Mp2 (4R)-D-Mercaptoproline
    Pip L-Pipecolic acid
    Dpip D-Pipecolic acid
    H-β3-HCit-OH (3S)-3-Amino-6-carbamidyl-hexanoic acid
    H-β3-HOrn-OH (3S)-3,6-Diamino-hexanoic acid
    H-β3-HtBuA-OH (3S)-3-Amino-5,5-dimethyl-hexanoic acid
    H-β3-HSar-OH N-Methyl-3-amino-propionic acid
    H-β3-HPen-OH (3R)-3-Amino-4-methyl-4-mercapto-pentanoic acid
    H-β3-HtBuG-OH (3R)-3-Amino-4,4-dimethyl-pentanoic acid
    H-β3-H4AmPhe-OH (3S)-3-Amino-4-(4′-aminophenyl)-butyric acid
    H-β3-H3AmPhe-OH (3S)-3-Amino-4-(3′-aminophenyl)-butyric acid
    H-β3-H2AmPhe-OH (3S)-3-Amino-4-(2′-aminophenyl)-butyric acid
    H-β3-HPhe(mC(NH2)═NH)—OH (3S)-3-Amino-4-(3′-amidinophenyl)-butyric acid
    H-β3-HPhe(pC(NH2)═NH)—OH (3S)-3-Amino-4-(4′-amidinophenyl)-butyric acid
    H-β3-HPhe(mNHC(NH2)═NH)—OH (3S)-3-Amino-4-(3′-guanidinophenyl)-butyric acid
    H-β3-HPhe(pNHC(NH2)═NH)—OH (3S)-3-Amino-4-(4′-guanidino-phenyl)-butyric acid
    H-β3-H2Pal-OH (3S)-3-Amino-4-(pyridine-2′-yl)-butyric acid
    H-β3-H4Pal-OH (3S)-3-Amino-4-(pyridine-4′-yl)-butyric acid
    H-β3-HPhg-OH (3R)-3-Amino-3-phenyl-propionic acid
    H-β3-HCha-OH (3S)-3-Amino-4-cyclohexyl-butyric acid
    H-β3-HC4al-OH (3S)-3-Amino-4-cyclobutyl-butyric acid
    H-β3-HC5al-OH (3S)-3-Amino-4-cyclopentyl-butyric acid
    H-β3-HNle-OH (3S)-3-Amino-heptanoic acid
    H-β3-H2Nal-OH (3S)-3-Amino-4-(2′-naphthyl)-butyric acid
    H-β3-H1Nal-OH (3S)-3-Amino-4-(1′-naphthyl)-butyric acid
    H-β3-H4ClPhe-OH (3S)-3-Amino-4-(4′-chlorophenyl)-butyric acid
    H-β3-H3ClPhe-OH (3S)-3-Amino-4-(3′-chlorophenyl)-butyric acid
    H-β3-H2ClPhe-OH (3S)-3-Amino-4-(2′-chlorophenyl)-butyric acid
    H-β3-H3,4Cl2Phe-OH (3S)-3-Amino-4-(3′,4′-dichlorophenyl)-butyric acid
    H-β3-H4FPhe-OH (3S)-3-Amino-4-(4′-fluorophenyl)-butyric acid
    H-β3-H3FPhe-OH (3S)-3-Amino-4-(3′-fluorophenyl)-butyric acid
    H-β3-H2FPhe-OH (3S)-3-Amino-4-(2′-fluorophenyl)-butyric acid
    H-β3-HThi-OH (3R)-3-Amino-4-(2′-thienyl)-butyric acid
    H-β3-HTza-OH (3R)-3-Amino-4-(2′-thiazolyl)-butyric acid
    H-β3-HMso-OH (3R)-3-Amino-4-methylsulfoxyl-butyric acid
    H-β3-HAcLys-OH (3S)-7-Acetylamino-3-amino-heptanoic acid
    H-β3-HDpr-OH (3R)-3,4-diamino-butyric acid
    H-β3-HA2Bu-OH (3S)-3,5-Diamino-pentanoic acid
    H-β3-HDbu-OH (3R)-3,4-Diamino-pentanoic acid
    H-β3-HAib-OH Amino-dimethyl-acetic acid
    H-β3-HCyp-OH 1-Amino-cyclopentane-1-yl-acetic acid
    H-β3-HY(Bzl)-OH (3S)-3-Amino-4-(4′-benzyloxyphenyl)-butyric acid
    H-β3-HH(Bzl)-OH (3S)-3-Amino-4-(1′-benzylimidazole-4′-yl)-butyric acid
    H-β3-HBip-OH (3S)-3-Amino-4-biphenylyl-butyric acid
    H-β3-HS(Bzl)-OH (3S)-3-Amino-4-(benzyloxy)-butyric acid
    H-β3-HT(Bzl)-OH (3R,4R)-3-Amino-4-benzyloxy-pentanoic acid
    H-β3-HalloT-OH (3R,4S)-3-Amino-4-hydroxy-pentanoic acid
    H-β3-HLeu3OH-OH (3R,4R)-3-Amino-4-hydroxy-5-methyl-hexanoic acid
    H-β3-HhAla-OH (3S)-3-Amino-pentanoic acid
    H-β3-HhArg-OH (3S)-3-Amino-7-guanidino-heptanoic acid
    H-β3-HhCys-OH (3R)-Amino-5-mercapto-pentanoic acid
    H-β3-HhGlu-OH (3S)-3-Amino-heptanedioic acid
    H-β3-HhGln-OH (3S)-3-Amino-6-carbamoyl-hexanoic acid
    H-β3-HhHis-OH (3S)-3-Amino-5-(imidazole-4′-yl)-pentanoic acid
    H-β3-HhIle-OH (3S,5S)-3-Amino-5-methyl-heptanoic acid
    H-β3-HhLeu-OH (3S)-3-Amino-6-methyl-heptanoic acid
    H-β3-HhNle-OH (3S)-3-Amino-octanoic acid
    H-β3-DiAoc-OH (3S)-3,8-Diamino-octanoic acid
    H-β3-HhMet-OH (3S)-3-Amino-6-methylthio-hexanoic acid
    H-β3-HhPe-OH (3S)-3-Amino-5-phenyl-pentanoic acid
    H-β3-HhSer-OH (3S)-3-Amino-5-hydroxy-pentanoic acid
    H-β3-HhThr-OH (3S,5R)-3-Amino-5-hydroxy-hexanoic acid
    H-β3-HhTrp-OH (3S)-3-Amino-5-(indol-3′-yl)-pentanoic acid
    H-β3-HhThr-OH (3S)-3-Amino-5-(4′-hydroxyphenyl)-pentanoic acid
    H-β3-HhCha-OH (3S)-3-Amino-5-cyclohexyl-pentanoic acid
    H-β3-HBpa-OH (3S)-3-Amino-4-(4′-benzoylphenyl)-butyric acid
    H-β3-HOctG-OH (3S)-3-Amino-undecanoic acid
    H-β3-HNle-OH (3S)-3-Amino-heptanoic acid
    H-β3-HTic-OH (3S)-1,2,3,4-Tetrahydroisoquinoline-3-yl-acetic acid
    H-β3-HTiq-OH (1S)-1,2,3,4-Tetrahydroisoquinoline-1-acetic acid
    H-β3-HOic-OH (2S,3aS, 7aS)-1-Octahydro-1H-indole-2-yl-acetic acid
    H-β3-H4AmPyrr1-OH (2S,4S)-4-Amino-pyrrolidine-2-acetic acid
    H-β3-H4AmPyrr2-OH (2S,4R)-4-Amino-pyrrolidine-2-acetic acid
    H-β3-H4PhePyrr1-OH (2S,4R)-4-Phenyl-pyrrolidine-2-acetic acid
    H-β3-H4PhePyrr2-OH (2S,4S)-4-Phenyl-pyrrolidine-2-acetic acid
    H-β3-H5PhePyrr1-OH (2S,5R)-5-Phenyl-pyrrolidine-2-acetic acid
    H-β3-H5PhePyrr2-OH (2S,5S)-5-Phenyl-pyrrolidine-2-acetic acid
    H-β3-H4Hyp1-OH (2S,4S)-4-Hydroxy-pyrrolidine-2-acetic acid
    H-β3-H4Hyp2-OH (2S,4R)-4-Hydroxy-pyrrolidine-2-acetic acid
    H-β3-H4 Mp1-OH (2R,4S)-4-Mercapto-pyrrolidine-2-acetic acid
    H-β3-H4 Mp2-OH (2R,4R)-4-Mercapto-pyrrolidine-2-acetic acid
    H-β3-HPip-OH (2S)-piperidine-2-acetic acid
    H-β3-HPro-OH (2S)-pyrrolidine-2-acetic acid
    H-β3-HDPro-OH (2R)-pyrrolidine-2-acetic acid
    Ahb 4-Amino-2-hydroxy-butyric acid
    H-γ4-DiHCit-OH (4S)-4-Amino-7-carbamidyl-heptanoic acid
    H-γ4-DiHOrn-OH (4S)-4,7-Diamino-heptanoic acid
    H-γ4-DiHtBuA-OH (4R)-4-Amino-6,6-dimethyl-heptanoic acid
    H-γ4-DiHSar-OH N-Methyl-4-amino-butyric acid
    H-γ4-DiHPen-OH (4R)-4-Amino-5-methyl-5-mercapto-hexanoic acid
    H-γ4-DiHtBuG-OH (4R)-4-Amino-5,5-dimethyl-hexanoic acid
    H-γ4-DiH4AmPhe-OH (4R)-4-Amino-5-(4′-aminophenyl)-pentanoic acid
    H-γ4-DiH3AmPhe-OH (4R)-4-Amino-5-(3′-aminophenyl)-pentanoic acid
    H-γ4-DiH2AmPhe-OH (4R)-4-Amino-5-(2′-aminophenyl)-pentanoic acid
    H-γ4-DiHPhe (mC(NH2)═NH)—OH (4R)-4-Amino-5-(3′-amidinophenyl)-pentanoic acid
    H-γ4-DiHPhe (pC(NH2)═NH)—OH (4R)-4-Amino-5-(4′-amidinophenyl)-pentanoic acid
    H-γ4-DiHPhe (mNHC(NH2)═NH)—OH (4R)-4-Amino-5-(3′-guanidino-phenyl)-pentanoic acid
    H-γ4-DiHPhe (pNHC(NH2)═NH)—OH (4R)-4-Amino-5-(4′-guanidino-phenyl)-pentanoic acid
    H-γ4-DiH2 Pal-OH (4R)-4-Amino-5-(pyridine-4′-yl)-pentanoic acid
    H-γ4-DiH4 Pal-OH (4R)-4-Amino-5-(pyridine-4′-yl)-pentanoic acid
    H-γ4-DiHPhg-OH (4R)-4-Amino-4-phenyl-butyric acid
    H-γ4-DiHCha-OH (4R)-4-Amino-5-cyclohexyl-pentanoic acid
    H-γ4-DiHC4al-OH (4R)-4-Amino-5-cyclobutyl-pentanoic acid
    H-γ4-DiHC5al-OH (4R)-4-Amino-5-cyclopentyl-pentanoic acid
    H-γ4-DiHNle-OH (4S)-4-Amino-octanoic acid
    H-γ4-DiH2Nal-OH (4S)-4-Amino-5-(2′-naphthyl)-pentanoic acid
    H-γ4-DiH1Nal-OH (4S)-4-Amino-5-(1′-naphthyl)-pentanoic acid
    H-γ4-DiH4ClPhe-OH (4R)-4-Amino-5-(4′-chlorophenyl)-pentanoic acid
    H-γ4-DiH3ClPhe-OH (4R)-4-Amino-5-(3′-chlorophenyl)-pentanoic acid
    H-γ4-DiH2ClPhe-OH (4R)-4-Amino-5-(2′-chlorophenyl)-pentanoic acid
    H-γ4-DiH3,4Cl2Phe-OH (4R)-4-Amino-5-(3′,4′-dichloro-phenyl)-pentanoic acid
    H-γ4-DiH4FPhe-OH (4R)-4-Amino-5-(4′-fluorophenyl)-pentanoic acid
    H-γ4-DiH3FPhe-OH (4R)-4-Amino-5-(3′-fluorophenyl)-pentanoic acid
    H-γ4-DiH2FPhe-OH (4R)-4-Amino-5-(2′-fluorophenyl)-pentanoic acid
    H-γ4-DiHThi-OH (4R)-4-Amino-5-(2′-thienyl)-pentanoic acid
    H-γ4-DiHTza-OH (4R)-4-Amino-5-(2′-thiazolyl)-pentanoic acid
    H-γ4-DiHMso-OH (4R)-4-Amino-5-methylsulfoxyl-pentanoic acid
    H-γ4-DiHAcLys-OH (4S)-8-Acetylamino-4-amino-ocatanoic acid
    H-γ4-DiHDpr-OH (4R)-4,5-diamino-pentanoic acid
    H-γ4-DiHA2Bu-OH (4R)-4,5-Diamino-hexanoic acid
    H-γ4-DiHDbu-OH (4R)-4,5-Diamion-hexanoic acid
    H-γ4-DiHAib-OH 3-Amino-3,3-dimethyl-propionic acid
    H-γ4-DiHCyp-OH (1′-Amino-cyclopentane-1′-yl)-3-propionic acid
    H-γ4-DiHY(Bzl)-OH (4R)-4-Amino-5-(4′-benzyloxyphenyl)-pentanoic acid
    H-γ4-DiHH(Bzl)-OH (4R)-4-Amino-5-(1′-benzylimidazole-4′-yl)-pentanoic acid
    H-γ4-DiHBip-OH (4R)-4-Amino-5-biphenylyl-pentanoic acid
    H-γ4-DiHS (Bzl)-OH (4S)-4-Amino-5-(benzyloxy)-pentanoic acid
    H-γ4-DiHT(Bzl)-OH (4R,5R)-4-Amino-5-benzyloxy-hexanoic acid
    H-γ4-DiHalloT-OH (4R,5S)-4-Amino-5-hydroxy-hexanoic acid
    H-γ4-DiHLeu3OH—OH (4R,5R)-4-Amino-5-hydroxy-6-methyl-heptanoic acid
    H-γ4-DiHhAla-OH (4S)-4-Amino-hexanoic acid
    H-γ4-DiHhArg-OH (4S)-4-Amino-8-guanidino-octanoic acid
    H-γ4-DiHhCys-OH (4R)-Amino-6-mercapto-hexanoic acid
    H-γ4-DiHhGlu-OH (4S)-4-Amino-octanedioic acid
    H-γ4-DiHhGln-OH (4S)-4-Amino-7-carbamoyl-heptanoic acid
    H-γ4-DiHhHis-OH (4S)-4-Amino-6-(imidazole-4′-yl)-hexanoic acid
    H-γ4-DiHhIle-OH (4S,6S)-4-Amino-6-methyl-octanoic acid
    H-γ4-DiHhLeu-OH (4S)-4-Amino-7-methyl-ocatanoic acid
    H-γ4-DiHhNle-OH (4S)-4-Amino-nonanoic acid
    H-γ4-DiHhLys-OH (4S)-4,9-Diamino-nonanoic acid
    H-γ4-DiHhMet-OH (4R)-4-Amino-7-methylthioheptanoic acid
    H-γ4-DiHhPhe-OH (4S)-4-Amino-6-phenyl-hexanoic acid
    H-γ4-DiHhSer-OH (4R)-4-Amino-6-hydroxy-hexanoic acid
    H-γ4-DiHhThr-OH (4R,6R)-4-Amino-6-hydroxy-heptanoic acid
    H-γ4-DiHhTrp-OH (4S)-4-Amino-6-(indol-3′-yl)-hexanoic acid
    H-γ4-DiHhTyr-OH (4S)-4-Amino-6-(4′-hydroxyphenyl)-hexanoic acid
    H-γ4-DiHhCha-OH (4R)-4-Amino-5-cyclohexyl-pentanoic acid
    H-γ4-DihBpa-OH (4R)-4-Amino-5-(4′-benzoylphenyl)-pentanoic acid
    H-γ4-DiHOctG-OH (4S)-4-Amino-dodecanoic acid
    H-γ4-DiHNle-OH (4S)-4-Amino-octanoic acid
    H-γ4-DiHTic-OH (3R)-1′,2′,3′,4′-Tetrahydroisoquinoline-3′-yl-3-propionic acid
    H-γ4-DiHTiq-OH (1′R)-1′,2′,3′,4′-Tetrahydroisoquinoline-1′-yl-3-propionic acid
    H-γ4-DiHOic-OH (2′S, 3′ aS, 7′ aS)-1′-Octahydro-1H-indole-2′-yl-3-propionic acid
    H-γ4-DiH4AmPyrr1-OH (2′R, 4′S)-4′-Amino-pyrrolidine-2′-yl-3-propionic acid
    H-γ4-DiH4AmPyrr2-OH (2′R, 4′R)-4′-Amino-pyrrolidine-2′-yl-3-propionic acid
    H-γ4-DiH4PhePyrr1-OH (2′R, 4′R)-4′-Phenyl-pyrrolidine-2′-yl-3-propionic acid
    H-γ4-DiH4PhePyrr2-OH (2′R, 4′S)-4′-Phenyl-pyrrolidine-2′-yl-3-propionic acid
    H-γ4-DiH5PhePyrr1-OH (2′S, 5′R)-5′-Phenyl-pyrrolidine-2′-yl-3-propionic acid
    H-γ4-DiH5PhePyrr2-OH (2′S, 5′S)-5′-Phenyl-pyrrolidine-2′-yl-3-propionic acid
    H-γ4-DiH4Hyp1-OH (2′R, 4′S)-4′-Hydroxy-pyrrolidine-2′-yl-2-propionic acid
    H-γ4-DiH4Hyp2-OH (2′R, 4′R)-4′-Hydroxy-pyrrolidine-2′-yl-3-propionic acid
    H-γ4-DiH4 Mp1-OH (2′R, 4′S)-4′-Mercapto-pyrrolidine-2′-yl-3-propionic acid
    H-γ4-DiH4 Mp2-OH (2′R, 4′R)-4′-Mercapto-pyrrolidine-2′-yl-3-propionic acid
    H-γ4-DiHPip-OH (2′S)-Piperidine-2′-yl-3-propionic acid
    H-γ4-DiHPro-OH (2′S)-Pyrrolidine-2′-yl-3-propionic acid
    H-γ4-DiHDPro-OH (2′R)-Pyrrolidine-2′-yl-3-propionic acid
    (AEt)G N-(2-Aminoethyl)glycine
    (APr)G N-(3-Amino-n-propyl)glycine
    (ABu)G N-(4-Amino-n-butyl)glycine
    (APe)G N-(5-Amino-n-pentyl)glycine
    (GuEt) G N-(2-Guanidinoethyl)glycine
    (GuPr)G N-(3-Guanidino-n-propyl)glycine
    (GuBu)G N-(4-Guanidino-n-butyl)glycine
    (GuPe)G N-(5-Guanidino-n-pentyl)glycine
    (PEG3-NH2)G N—[H2N—(CH2)3—(OCH2—CH2)2—O(CH2)3]glycine
    (Me)G N-Methylglycine
    (Et)G N-Ethylglycine
    (Bu)G N-Butylglycine
    (Pe)G N-Pentylglycine
    (Ip)G N-Isopropylglycine
    (2MePr)G N-(2-Methylpropyl)glycine
    (3MeBu)G N-(3-Methylbutyl)glycine
    (1MePr)G (1S)—N-(1-Methylpropyl)glycine
    (2MeBu)G (2S)—N-(2-Methylbutyl)glycine
    (MthEt)G N-(Methylthioethyl)glycine
    (MthPr)G N-(Methylthiopropyl)glycine
    (Ben) G N-(Benzyl) glycine
    (PhEt)G N-(2-Phenylethyl)glycine
    (HphMe)G N-([4′-hydroxyphenyl]methyl)glycine
    (HphEt)G N-(2-[4′-hydroxyphenyl]ethyl)glycine
    (ImMe)G N-(Imidazol-5-yl-methyl)glycine
    (ImEt)G N-(2-(Imidazol-5′-yl)ethyl)glycine
    (InMe)G N-(Indol-2-yl-methyl)glycine
    (InEt)G N-(2-(Indol-2′-yl)ethyl)glycine
    (CboMe)G N-(Carboxymethyl)glycine
    (CboEt)G N-(2-Carboxyethyl)glycine
    (CboPr)G N-(3-Carboxypropyl)glycine
    (CbaMe)G N-(Carbamoylmethyl)glycine
    (CbaEt)G N-(2-Carbamoylethyl)glycine
    (CbaPr)G N-(3-Carbamoylpropyl)glycine
    (HyEt)G N-(2-Hydroxyethyl)glycine
    (HyPr)G (2R)—N-(2-Hydroxypropyl)glycine
    (Mcet)G N-(2-Mercaptoethyl)glycine
    NMeAla L-N-Methylalanine
    NMeDAla D-N-Methylalanine
    NMeVal L-N-Methylvaline
    NMeDVal D-N-Methylvaline
    NMeIle L-N-Methylisoleucine
    NMeDIle D-N-Methylisoleucine
    NMeLeu L-N-Methylleucine
    NMeDLeu D-N-Methylleucine
    NMeNle L-N-Methylnorleucine
    NMeDNle D-N-Methylnorleucine
    NMeMet L-N-Methylmethionine
    NMeDMet D-N-Methylmethionine
    NMeTyr L-N-Methyltyrosine
    NMeDTyr D-N-Methyltyrosine
    NMeHis L-N-Methylhistidine
    NMeDHis D-N-Methylhistidine
    NMePhe L-N-Methylphenylalanine
    NMeDPhe D-N-Methylphenylalanine
    NMeTrp L-N-Methyltryptophane
    NMeDTrp D-N-Methyltryptophane
    NMeSer L-N-Methylserine
    NMeDSer D-N-Methylserine
    NMeAsp L-N-Methylaspartic acid
    NMeDAsp D-N-Methylaspartic acid
    NMeGlu L-N-Methylglutamic acid
    NMeDGlu D-N-Methylglutamic acid
    NMeLys L-N-Methyllysine
    NMeDLys D-N-Methyllysine
    NMeArg L-N-Methylarginine
    NMeDArg D-N-Methylarginine
    NMeDab L-N-Methyl-2,4-diamino butyric acid
    NMeDDab D-N-Methyl-2,4-diamino butyric acid
    NMeCys L-N-Methylcysteine
    NMeDCys D-N-Methylcysteine
    NMeAsn L-N-Methylasparagine
    NMecAsn D-N-Methylasparagine
    NMeGln L-N-Methylglutamine
    NMeDGln D-N-Methylglutamine
    NMeThr L-N-Methylthreonine
    NMeDThr D-N-Methylthreonine


Particularly preferred residues for group C are:

    Ala L-Alanine
    DAla D-Alanine
    Ile L-Isoleucine
    DIle D-Isoleucine
    Leu L-Leucine
    DLeu D-Leucine
    Met L-Methionine
    DMet D-Methionine
    Val L-Valine
    DVal D-Valine
    tBuA L-t-Butylalanine
    DtBuA D-t-Butylalanine
    tBuG L-tert.-Butylglycine
    DtBuG D-tert.-Butylglycine
    Cha L-Cyclohexylalanine
    DCha D-Cyclohexylalanine
    C4al L-3-Cyclobutylalanine
    DC4al D-3-Cyclobutylalanine
    C5al L-3-Cyclopentylalanine
    DC5al D-3-Cyclopentylalanine
    Nle L-Norleucine
    DNle D-Norleucine
    hAla L-Homo-alanine
    DhAla D-Homo-alanine
    hIle L-Homo-isoleucine
    DhIle D-Homo-isoleucine
    hLeu L-Homo-leucine
    DhLeu D-Homo-leucine
    hMet L-Homo-Methionine
    DhMet D-Homo-Methionine
    hVal L-Homo-valine
    DhVal D-Homo-valine
    hCha L-Homo-cyclohexylalanine
    DhCha D-Homo-cyclohexylalanine
    OctG L-Octylglycine
    DOctG D-Octylglycine
    NMeAla L-N-Methylalanine
    NMeDAla D-N-Methylalanine
    NMeVal L-N-Methylvaline
    NMeDVal D-N-Methylvaline
    NMeIle L-N-Methylisoleucine
    NMeDIle D-N-Methylisoleucine
    NMeLeu L-N-Methylleucine
    NMeDLeu D-N-Methylleucine
    NMeNle L-N-Methylnorleucine
    NMeDNle D-N-Methylnorleucine
    NMeNle L-N-Methylnorleucine
    NMeDNle D-N-Methylnorleucine
    NMeMet L-N-Methylmethionine
    NMeDMet D-N-Methylmethionine


Particularly preferred residues for group D are:

    His L-Histidine
    DHis D-Histidine
    Phe L-Phenylalanine
    DPhe D-Phenylalanine
    Trp L-Tryptophan
    DTrp D-Tryptophan
    Tyr L-Tyrosine
    DTyr D-Tyrosine
    2 Pal (2S)-2-Amino-3-(pyridine-2′-yl)-propionic acid
    D2 Pal (2R)-2-Amino-3-(pyridine-2′-yl)-propionic acid
    4 Pal (2S)-2-Amino-3-(pyridine-4′-yl)-propionic acid
    D4 Pal (2R)-2-Amino-3-(pyridine-4′-yl)-propionic acid
    Phg L-Phenylglycine
    DPhg D-Phenylglycine
    2NaI L-2-Naphthylalanine
    D2NaI D-2-Naphthylalanine
    1Nal L-1-Naphthylalanine
    D1Nal D-1-Naphthylalanine
    4ClPhe L-4-Chlorophenylalanine
    D4ClPhe D-4-Chlorophenylalanine
    3ClPhe L-3-Chlorophenylalanine
    D3ClPhe D-3-Chlorophenylalanine
    2ClPhe L-2-Chlorophenylalanine
    D2ClPhe D-2-Chlorophenylalanine
    3,4Cl2Phe L-3,4-Dichlorophenylalanine
    D3,4Cl2Phe D-3,4-Dichlorophenylalanine
    4FPhe L-4-Fluorophenylalanine
    D4FPhe D-4-Fluorophenylalanine
    3FPhe L-3-Fluorophenylalanine
    D3FPhe D-3-Fluorophenylalanine
    2FPhe L-2-Fluorophenylalanine
    D2FPhe D-2-Fluorophenylalanine
    Thi L-β-2-Thienylalanine
    DThi D-β-2-Thienylalanine
    Tza L-2-Thiazolylalanine
    DTza D-2-Thiazolylalanine
    Tyr(Bzl) L-O-Benzyltyrosine
    DTyr(Bzl) D-O-Benzyltyrosine
    His(Bzl) (3S)-2-Amino-3-(1′-benzylimidazole-4′-yl)-propionic acid
    DHis(Bzl) (3R)-2-Amino-3-(1′-benzylimidazole-4′-yl)-propionic acid
    Bip L-(4-phenyl)phenylalanine
    DBip D-(4-phenyl)phenylalanine
    Ser(Bzl) L-O-Benzylserine
    DSer(Bzl) D-O-Benzylserine
    Thr(Bzl) L-O-Benzylthreonine
    DThr(Bzl) D-O-Benzylthreonine
    hPhe L-Homo-phenylalanine
    DhPhe D-Homo-phenylalanine
    hTrp L-Homo-tryptophan
    DhTrp D-Homo-tryptophan
    hTyr L-Homo-tyrosine
    DhTyr D-Homo-tyrosine
    hHis L-Homo-histidine
    DhHis D-Homo-histidine
    Bpa L-4-Benzoylphenylalanine
    DBpa D-4-Benzoylphenylalanine
    NMePhe L-N-Methylphenylalanine
    NMeDPhe D-N-Methylphenylalanine
    NMeTyr L-N-Methyltyrosine
    NMeDTyr D-N-Methyltyrosine
    NMeHis L-N-Methylhistidine
    NMeDHis D-N-Methylhistidine
    NMeTrp L-N-Methyltryptophane
    NMeDTrp D-N-Methyltryptophane


Particularly preferred residues for group E are

    Arg L-Arginine
    DArg D-Arginine
    Lys L-Lysine
    DLys D-Lysine
    Orn L-Ornithine
    DOrn D-Ornithine
    Dpr L-2,3-Diaminopropionic acid
    DDpr D-2,3-Diaminopropionic acid
    A2Bu L-2,4-Diaminobutyric acid
    DA2Bu (2R)-2,4-Diaminobutyric acid
    Dab L-2,4-Diaminobutyric acid
    DDab D-2,4-Diaminobutyric acid
    Dbu (2S,3S)-2,3-Diaminobutyric acid
    DDbu (2R)-2,3-Diamino-butyric acid
    4AmPhe L-para-Aminophenylalanine
    D4AmPhe D-para-Aminophenylalanine
    3AmPhe L-meta-Aminophenylalanine
    D3AmPne D-meta-Aminophenylalanine
    2AmPhe L-ortho-Aminophenylalanine
    D2AmPhe D-ortho-Aminophenylalanine
    Phe(mC(NH2)═NH) L-meta-Amidinophenylalanine
    DPhe(mC(NH2)═NH) D-meta-Amidinophenylalanine
    Phe(pC(NH2)═NH) L-para-Amidinophenylalanine
    DPhe(pC(NH2)═NH) D-para-Amidinophenylalanine
    Phe(mNHC(NH2)═NH) L-meta-Guanidinophenylalanine
    DPhe(mNHC(NH2)═NH) D-meta-Guanidinophenylalanine
    Phe(pNHC(NH2)═NH) L-para-Guanidinophenylalanine
    DPhe(pNHC(NH2)═NH) D-para-Guanidinophenylalanine
    hArg L-Homo-arginine
    DhArg D-Homo-arginine
    hLys L-Homo-lysine
    DhLys D-Homo-lysine
    NMeLys L-N-Methyllysine
    NMeDLys D-N-Methyllysine
    NMeArg L-N-Methylarginine
    NMeDArg D-N-Methylarginine
    NMeDab L-N-Methyl-2,4-diamino butyric acid
    NMeDDab D-N-Methyl-2,4-diamino butyric acid


Particularly preferred residues for group F are

    Asn L-Asparagine
    DAsn D-Asparagine
    Asp L-Aspartic acid
    DAsp D-Aspartic acid
    Cys L-Cysteine
    DCys D-Cysteine
    Gln L-Glutamine
    DGln D-Glutamine
    Glu L-Glutamic acid
    DGlu D-Glutamic acid
    Ser L-Serine
    DSer D-Serine
    Thr L-Threonine
    DThr D-Threonine
    Cit L-Citrulline
    DCit D-Citrulline
    Pen L-Penicillamine
    DPen D-Penicillamine
    AcLys L-N′-Acetyllysine
    DAcLys N-Acetyl-D-lysine
    alloT (2S,3S)-2-Amino-3-hydroxy-butyric acid
    DalloT (2R,3S)-2-Amino-3-hydroxy-butyric acid
    Leu3OH (2S,3R)-2-Amino-3-hydroxy-4-methyl-pentanoic acid
    DLeu3OH (2R,3R)-2-Amino-3-hydroxy-4-methyl-pentanoic acid
    hCys L-Homo-cysteine
    DhCys D-Homo-cysteine
    hSer L-Homo-serine
    DhSer D-Homo-serine
    hGlu L-Homo-glutamic acid
    DhGlu D-glutamic acid
    hGln L-Homo-glutamine
    DhGln D-Homo-glutamine
    hThr L-Homo-threonine
    DhThr D-Homo-threonine
    NMeSer L-N-Methylserine
    NMeDSer D-N-Methylserine
    NMeAsp L-N-Methylaspartic acid
    NMeDAsp D-N-Methylaspartic acid
    NMeGlu L-N-Methylglutamic acid
    NMeDGlu D-N-Methylglutamic acid
    NMeCys L-N-Methylcysteine
    NMeDCys D-N-Methylcysteine
    NMeAsn L-N-Methylasparagine
    NMecAsn D-N-Methylasparagine
    NMeGln L-N-Methylglutamine
    NMeDGln D-N-Methylglutamine
    NMeThr L-N-Methylthreonine
    NMeDThr D-N-Methylthreonine


Particularly preferred residues for group I are

    (AEt)G N-(2-Aminoethyl)glycine
    (APr)G N-(3-Amino-n-propyl)glycine
    (ABu)G N-(4-Amino-n-butyl)glycine
    (APe)G N-(5-Amino-n-pentyl)glycine
    (GuEt)G N-(2-Guanidinoethyl)glycine
    (GuPr) G N-(3-Guanidino-n-propyl) glycine
    (GuBu)G N-(4-Guanidino-n-butyl)glycine
    (GuPe)G N-(5-Guanidino-n-pentyl)glycine
    (PEG3-NH2)G N—[H2N—(CH2)3—(OCH2—CH2)2—O(CH2)3]glycine
    (Me)G N-Methylglycine
    (Et)G N-Ethylglycine
    (Bu)G N-Butylglycine
    (Pe)G N-Pentylglycine
    (Ip)G N-Isopropylglycine
    (2MePr)G N-(2-Methylpropyl)glycine
    (3MeBu)G N-(3-Methylbutyl)glycine
    (1MePr)G (1S)—N-(1-Methylpropyl)glycine
    (2MeBu)G (2S)—N-(2-Methylbutyl)glycine
    (MthEt)G N-(Methylthioethyl)glycine
    (MthPr)G N-(Methylthiopropyl)glycine
    (Ben) G N-(Benzyl)glycine
    (PhEt)G N-(2-Phenylethyl)glycine
    (HphMe)G N-([4′-hydroxyphenyl]methyl)glycine
    (HphEt)G N-(2-[4′-hydroxyphenyl]ethyl)glycine
    (ImMe)G N-(Imidazol-5-yl-methyl)glycine
    (ImEt)G N-(2-(Imidazol-5′-yl)ethyl)glycine
    (InMe)G N-(Indol-2-yl-methyl)glycine
    (InEt)G N-(2-(Indol-2′-yl)ethyl)glycine
    (CboMe)G N-(Carboxymethyl)glycine
    (CboEt)G N-(2-Carboxyethyl)glycine
    (CboPr)G N-(3-Carboxypropyl)glycine
    (CbaMe)G N-(Carbamoylmethyl)glycine
    (CbaEt)G N-(2-Carbamoylethyl)glycine
    (CbaPr)G N-(3-Carbamoylpropyl)glycine
    (HyEt)G N-(2-Hydroxyethyl)glycine
    (HyPr)G (2R)—N-(2-Hydroxypropyl)glycine
    (Mcet)G N-(2-Mercaptoethyl)glycine


Particularly preferred residues for group M are

    Ahb 4-Amino-2-hydroxy-butyric acid
    H-γ4-DihAla-OH (4S)-4-Amino-pentanoic acid
    H-γ4-DihVal-OH (4R)-4-Amino-5-methyl-hexanoic acid
    H-γ4-DihIle-OH (4R,5S)-4-Amino-5-methyl-heptanoic acid
    H-γ4-DihLeu-OH (4R)-4-Amino-6-methyl-heptanoic acid
    H-γ4-DihMet-OH (4R)-4-Amino-6-methylthio-hexanoic acid
    H-γ4-DihTyr-OH (4R)-4-Amino-5-(4′-hydroxyphenyl)-pentanoic acid
    H-γ4-DihHis-OH (4R)-4-Amino-5-(imidazole-4′-yl)-pentanoic acid
    H-γ4-DihPhe-OH (4R)-4-Amino-5-phenyl-pentanoic acid
    H-γ4-DiTrp-OH (4R)-4-Amino-5-(indol-3′-yl)-pentanoic acid
    H-γ4-DihSer-OH (4R)-4-Amino-5-hydroxy-pentanoic acid
    H-γ4-DihAsp-OH (4R)-4-Amino-hexanedioic acid
    H-γ4-DihGlu-OH 4-Amino-heptanedioic acid
    H-γ4-DihLys-OH (4S)-4,8-Diamino-octanoic acid
    H-γ4-DihArg-OH (4S)-4-Amino-7-guanidino-heptanoic-acid
    H-γ4-DihCys-OH (4R)-4-Amino-5-mercapto-pentanoic acid
    H-γ4-DihAsn-OH (4R)-4-Amino-5-carbamoyl-pentanoic acid
    H-γ4-DihGln-OH (3S)-3-Amino-5-carbamoyl-hexanoic acid
    H-γ4-DihThr-OH (4R,5R)-4-Amino-5-hydroxy-hexanoic acid
    H-γ4-DiHCit-OH (4S)-4-Amino-7-carbamidyl-heptanoic acid
    H-γ4-DiHOrn-OH (4S)-4,7-Diamino-heptanoic acid
    H-γ4-DiHtBuA-OH (4R)-4-Amino-6,6-dimethyl-heptanoic acid
    H-γ4-DiHSar-OH N-Methyl-4-amino-butyric acid
    H-γ4-DiHPen-OH (4R)-4-Amino-5-methyl-5-mercapto-hexanoic acid
    H-γ4-DiHtBuG-OH (4R)-4-Amino-5,5-dimethyl-hexanoic acid
    H-γ4-DiH4AmPhe-OH (4R)-4-Amino-5-(4′-aminophenyl)-pentanoic acid
    H-γ4-DiH3AmPhe-OH (4R)-4-Amino-5-(3′-aminophenyl)-pentanoic acid
    H-γ4-DiH2AmPhe-OH (4R)-4-Amino-5-(2′-aminophenyl)-pentanoic acid
    H-γ4-DiHPhe (mC(NH2)═NH)—OH (4R)-4-Amino-5-(3′-amidinophenyl)-pentanoic acid
    H-γ4-DiHPhe (pC(NH2)═NH)—OH (4R)-4-Amino-5-(4′-amidinophenyl)-pentanoic acid
    H-γ4-DiHPhe (mNHC(NH2)═NH)—OH (4R)-4-Amino-5-(3′-guanidino-phenyl)-pentanoic acid
    H-γ4-DiHPhe (pNHC(NH2)═NH)—OH (4R)-4-Amino-5-(4′-guanidino-phenyl)-pentanoic acid
    H-γ4-DiH2 Pal-OH (4R)-4-Amino-5-(pyridine-4′-yl)-pentanoic acid
    H-γ4-DiH4 Pal-OH (4R)-4-Amino-5-(pyridine-4′-yl)-pentanoic acid
    H-γ4-DiHPhg-OH (4R)-4-Amino-4-phenyl-butyric acid
    H-γ4-DiHCha-OH (4R)-4-Amino-5-cyclohexyl-pentanoic acid
    H-γ4-DiHC4al-OH (4R)-4-Amino-5-cyclobutyl-pentanoic acid
    H-γ4-DiHC5al-OH (4R)-4-Amino-5-cyclopentyl-pentanoic acid
    H-γ4-DiHNle-OH (4S)-4-Amino-octanoic acid
    H-γ4-DiH2Nal-OH (4S)-4-Amino-5-(2′-naphthyl)-pentanoic acid
    H-γ4-DiH1Nal-OH (4S)-4-Amino-5-(1′-naphthyl)-pentanoic acid
    H-γ4-DiH4ClPhe-OH (4R)-4-Amino-5-(4′-chlorophenyl)-pentanoic acid
    H-γ4-DiH3ClPhe-OH (4R)-4-Amino-5-(3′-chlorophenyl)-pentanoic acid
    H-γ4-DiH2ClPhe-OH (4R)-4-Amino-5-(2′-chlorophenyl)-pentanoic acid
    H-γ4-DiH3,4Cl2Phe-OH (4R)-4-Amino-5-(3′,4′-dichloro-phenyl)-pentanoic acid
    H-γ4-DiH4FPhe-OH (4R)-4-Amino-5-(4′-fluorophenyl)-pentanoic acid
    H-γ4-DiH3FPhe-OH (4R)-4-Amino-5-(3′-fluorophenyl)-pentanoic acid
    H-γ4-DiH2FPhe-OH (4R)-4-Amino-5-(2′-fluorophenyl)-pentanoic acid
    H-γ4-DiHThi-OH (4R)-4-Amino-5-(2′-thienyl)-pentanoic acid
    H-γ4-DiHTza-OH (4R)-4-Amino-5-(2′-thiazolyl)-pentanoic acid
    H-γ4-DiHMso-OH (4R)-4-Amino-5-methylsulfoxyl-pentanoic acid
    H-γ4-DiHAcLys-OH (4S)-8-Acetylamino-4-amino-ocatanoic acid
    H-γ4-DiHDpr-OH (4R)-4,5-diamino-pentanoic acid
    H-γ4-DiHA2Bu-OH (4R)-4,5-Diamino-hexanoic acid
    H-γ4-DiHDbu-OH (4R)-4,5-Diamion-hexanoic acid
    H-γ4-DiHY(Bzl)-OH (4R)-4-Amino-5-(4′-benzyloxyphenyl)-pentanoic acid
    H-γ4-DiHH (Bzl)-OH (4R)-4-Amino-5-(1′-benzylimidazole-4′-yl)-pentanoic acid
    H-γ4-DiHBip-OH (4R)-4-Amino-5-biphenylyl-pentanoic acid
    H-γ4-DiHS (Bzl)-OH (4S)-4-Amino-5-(benzyloxy)-pentanoic acid
    H-γ4-DiHT(Bzl)-OH (4R,5R)-4-Amino-5-benzyloxy-hexanoic acid
    H-γ4-DiHalloT-OH (4R,5S)-4-Amino-5-hydroxy-hexanoic acid
    H-γ4-DiHLeu3OH—OH (4R,5R)-4-Amino-5-hydroxy-6-methyl-heptanoic acid
    H-γ4-DiHhAla-OH (4S)-4-Amino-hexanoic acid
    H-γ4-DiHhArg-OH (4S)-4-Amino-8-guanidino-octanoic acid
    H-γ4-DiHhCys-OH (4R)-Amino-6-mercapto-hexanoic acid
    H-γ4-DiHhGlu-OH (4S)-4-Amino-ocatanedioic acid
    H-γ4-DiHhGln-OH (4S)-4-Amino-7-carbamoyl-heptanoic acid
    H-γ4-DiHhHis-OH (4S)-4-Amino-6-(imidazole-4′-yl)-hexanoic acid
    H-γ4-DiHhlle-OH (4S,6S)-4-Amino-6-methyl-octanoic acid
    H-γ4-DiHhLeu-OH (4S)-4-Amino-7-methyl-ocatanoic acid
    H-γ4-DiHhNle-OH (4S)-4-Amino-nonanoic acid
    H-γ4-DiHhLys-OH (4S)-4,9-Diamino-nonanoic acid
    H-γ4-DiHhMet-OH (4R)-4-Amino-7-methylthioheptanoic acid
    H-γ4-DiHhPhe-OH (4S)-4-Amino-6-phenyl-hexanoic acid
    H-γ4-DiHhSer-OH (4R)-4-Amino-6-hydroxy-hexanoic acid
    H-γ4-DiHhThr-OH (4R,6R)-4-Amino-6-hydroxy-heptanoic acid
    H-γ4-DiHhTrp-OH (4S)-4-Amino-6-(indol-3′-yl)-hexanoic acid
    H-γ4-DiHhTyr-OH (4S)-4-Amino-6-(4′-hydroxyphenyl)-hexanoic acid
    H-γ4-DiHhCha-OH (4R)-4-Amino-5-cyclohexyl-pentanoic acid
    H-γ4-DihBpa-OH (4R)-4-Amino-5-(4′-benzoylphenyl)-pentanoic acid
    H-γ4-DiHOctG-OH (4S)-4-Amino-dodecanoic acid
    H-γ4-DiHNle-OH (4S)-4-Amino-octanoic acid


Particularly preferred residues for group N are:

    H-β3-HAla-OH (3S)-3-Amino-butyric acid
    H-β3-HVal-OH (3R)-3-Amino-4-methyl-valeric acid
    H-β3-HIle-OH (3R,4S)-3-Amino-4-methyl-hexanoic acid
    H-β3-HLeu-OH (3S)-3-Amino-5-methyl-hexanoic acid
    H-β3-HMet-OH (3S)-3-Amino-5-methylthio pentanoic acid
    H-β3-HTyr-OH (3S)-3-Amino-4-(4′-hydroxyphenyl)-butyric acid
    H-β3-HHis-OH (3S)-3-Amino-4-(imidazole-4′-yl)-butyric acid
    H-β3-HPhe-OH (3S)-3-Amino-4-phenyl-butyric acid
    H-β3-HTrp-OH (3S)-3-Amino-4-(indol-3′-yl)-butyric acid
    H-β3-HSer-OH (3R)-3-Amino-4-hydroxy-butyric acid
    H-β3-HAsp-OH 3-Amino-pentanedioic acid
    H-β3-HGlu-OH (3S)-3-Amino-hexanedioic acid
    H-β3-HLys-OH (3S)-3,7-Diamino-heptanoic acid
    H-β3-HArg-OH (3S)-3-Amino-6-guanidino-hexanoic-acid
    H-β3-HCys-OH (3R)-3-Amino-4-mercapto-butyric acid
    H-β3-HAsn-OH (3S)-3-Amino-4-carbamoyl-butyric acid
    H-β3-HGln-OH (3S)-3-Amino-5-carbamoyl-pentanoic acid
    H-β3-HThr-OH (3R,4R)-3-Amino-4-hydroxy-pentanoic acid
    H-β3-HCit-OH (3S)-3-Amino-6-carbamidyl-hexanoic acid
    H-β3-HOrn-OH (3S)-3,6-Diamino-hexanoic acid
    H-β3-HtBuA-OH (3S)-3-Amino-5,5-dimethyl-hexanoic acid
    H-β3-HSar-OH N-Methyl-3-amino-propionic acid
    H-β3-HPen-OH (3R)-3-Amino-4-methyl-4-mercapto-pentanoic acid
    H-β3-HtBuG-OH (3R)-3-Amino-4,4-dimethyl-pentanoic acid
    H-β3-H4AmPhe-OH (3S)-3-Amino-4-(4′-aminophenyl)-butyric acid
    H-β3-H3AmPhe-OH (3S)-3-Amino-4-(3′-aminophenyl)-butyric acid
    H-β3-H2AmPhe-OH (3S)-3-Amino-4-(2′-aminophenyl)-butyric acid
    H-β3-HPhe(mC(NH2)═NH)—OH (3S)-3-Amino-4-(3′-amidinophenyl)-butyric acid
    H-β3-HPhe(pC(NH2)═NH)—OH (3S)-3-Amino-4-(4′-amidinophenyl)-butyric acid
    H-β3-HPhe(mNHC(NH2)═NH)—OH (3S)-3-Amino-4-(3′-guanidinophenyl)-butyric acid
    H-β3-HPhe(pNHC(NH2)═NH)—OH (3S)-3-Amino-4-(4′-guanidino-phenyl)-butyric acid
    H-β3-H2 Pal-OH (3S)-3-Amino-4-(pyridine-2′-yl)-butyric acid
    H-β3-H4 Pal-OH (3S)-3-Amino-4-(pyridine-4′-yl)-butyric acid
    H-β3-HPhg-OH (3R)-3-Amino-3-phenyl-propionic acid
    H-β3-HCha-OH (3S)-3-Amino-4-cyclohexyl-butyric acid
    H-β3-HC4al-OH (3S)-3-Amino-4-cyclobutyl-butyric acid
    H-β3-HC5al-OH (3S)-3-Amino-4-cyclopentyl-butyric acid
    H-β3-HNle-OH (3S)-3-Amino-heptanoic acid
    H-β3-H2Nal-OH (3S)-3-Amino-4-(2′-naphthyl)-butyric acid
    H-β3-H1Nal-OH (3S)-3-Amino-4-(1′-naphthyl)-butyric acid
    H-β3-H4ClPhe-OH (3S)-3-Amino-4-(4′-chlorophenyl)-butyric acid
    H-β3-H3ClPhe-OH (3S)-3-Amino-4-(3′-chlorophenyl)-butyric acid
    H-β3-H2ClPhe-OH (3S)-3-Amino-4-(2′-chlorophenyl)-butyric acid
    H-β3-H3, 4Cl2Phe-OH (3S)-3-Amino-4-(3′,4′-dichlorophenyl)-butyric acid
    H-β3-H4FPhe-OH (3S)-3-Amino-4-(4′-fluorophenyl)-butyric acid
    H-β3-H3FPhe-OH (3S)-3-Amino-4-(3′-fluorophenyl)-butyric acid
    H-β3-H2FPhe-OH (3S)-3-Amino-4-(2′-fluorophenyl)-butyric acid
    H-β3-HThi-OH (3R)-3-Amino-4-(2′-thienyl)-butyric acid
    H-β3-HTza-OH (3R)-3-Amino-4-(2′-thiazolyl)-butyric acid
    H-β3-HMso-OH (3R)-3-Amino-4-methylsulfoxyl-butyric acid
    H-β3-HAcLys-OH (3S)-7-Acetylamino-3-amino-heptanoic acid
    H-β3-HDpr-OH (3R)-3,4-diamino-butyric acid
    H-β3-HA2Bu-OH (3S)-3,5-Diamino-pentanoic acid
    H-β3-HDbu-OH (3R)-3,4-Diamino-pentanoic acid
    H-β3-HY(Bzl)-OH (3S)-3-Amino-4-(4′-benzyloxyphenyl)-butyric acid
    H-β3-HH(Bzl)-OH (3S)-3-Amino-4-(1′-benzylimidazole-4′-yl)-butyric acid
    H-β3-HBip-OH (3S)-3-Amino-4-biphenylyl-butyric acid
    H-β3-HS(Bzl)-OH (3S)-3-Amino-4-(benzyloxy)-butyric acid
    H-β3-HT(Bzl)-OH (3R,4R)-3-Amino-4-benzyloxy-pentanoic acid
    H-β3-HalloT-OH (3R,4S)-3-Amino-4-hydroxy-pentanoic acid
    H-β3-HLeu3OH—OH (3R,4R)-3-Amino-4-hydroxy-5-methyl-hexanoic acid
    H-β3-HhAla-OH (3S)-3-Amino-pentanoic acid
    H-β3-HhArg-OH (3S)-3-Amino-7-guanidino-heptanoic acid
    H-β3-HhCys-OH (3R)-Amino-5-mercapto-pentanoic acid
    H-β3-HhGlu-OH (3S)-3-Amino-heptanedioic acid
    H-β3-HhGln-OH (3S)-3-Amino-6-carbamoyl-hexanoic acid
    H-β3-HhHis-OH (3S)-3-Amino-5-(imidazole-4′-yl)-pentanoic acid
    H-β3-HhIle-OH (3S,5S)-3-Amino-5-methyl-heptanoic acid
    H-β3-HhLeu-OH (3S)-3-Amino-6-methyl-heptanoic acid
    H-β3-HhNle-OH (3S)-3-Amino-octanoic acid
    H-β3-DiAoc-OH (3S)-3,8-Diamino-octanoic acid
    H-β3-HhMet-OH (3S)-3-Amino-6-methylthio-hexanoic acid
    H-β3-HhPe-OH (3S)-3-Amino-5-phenyl-pentanoic acid
    H-β3-HhSer-OH (3S)-3-Amino-5-hydroxy-pentanoic acid
    H-β3-HhThr-OH (3S,5R)-3-Amino-5-hydroxy-hexanoic acid
    H-β3-HhTrp-OH (3S)-3-Amino-5-(indol-3′-yl)-pentanoic acid
    H-β3-HhThr-OH (3S)-3-Amino-5-(4′-hydroxyphenyl)-pentanoic acid
    H-β3-HhCha-OH (3S)-3-Amino-5-cyclohexyl-pentanoic acid
    H-β3-HBpa-OH (3S)-3-Amino-4-(4′-benzoylphenyl)-butyric acid
    H-β3-HOctG-OH (3S)-3-Amino-undecanoic acid
    H-β3-HNle-OH (3S)-3-Amino-heptanoic acid


In a particular embodiment of the invention Xaa15 is DPro, DCha, NMeDIle, DTyr, DHis, DHis(Bzl), D4Pal, NMepTyr, NMeDLys, (ABu)G, DIle, NMecAla, DLys, or DDab; and Xaa16 is LPro or Oic; the aforesaid DPro moiety and/or the aforesaid LPro moiety being optionally substituted as shown in Formula A8′ and, respectively, A8′′, as defined above.
The amino acid residues in Cyclo (-Xaa1-Xaa2-Xaa3-Cys4-Xaa5-Xaa6-Xaa7-Xaa8-Arg9-Tyr10-Cys11-Xaa12-Xaa13-Xaa14-Xaa15-Xaa16-), disulfide bond between Cys4 and Cys11, are preferably:

    
    
        Xaa1: Tyr or of type M;
        Xaa2: His;
        Xaa3: Ala;
        Xaa5: Ser, D-isomer of type F, γ4-amino acid residue of type M or β3-amino acid residue of type N;
        Xaa6: Ala;
        Xaa7: of formula -A-CO— or D-isomer of type D;
        Xaa8: Dab;
        Xaa12: Tyr;
        Xaa13: Gln;
        Xaa14: Lys;
        Xaa15: of formula -A-CO—, D-isomer of type C, D, E or F, or N-substituted glycine of type I
        Xaa16: of formula B—CO—

with the proviso that

        Xaa1: is a γ4-amino acid residue of type M; and/or
        Xaa5: is the D-isomer of type F, or a γ4-amino of type M or a β3-amino acid residue of type N; and/or;
        Xaa15: is the D-isomer of type C, D, E or F, or a N-substituted glycine of type I; and/or
        Xaa16: is of formula —B—CO— with B being the enantiomer of group A105.
    
    


The amino acid residues in Cyclo(-Xaa1-Xaa2-Xaa3-Cys4-Xaa5-Xaa6-Xaa7-Xaa8-Arg9-Tyr10-Cys11-Xaa12-Xaa13-Xaa14-Xaa15-Xaa16-), disulfide bond between Cys4 and Cys11, are most preferably:

    
    
        Xaa1: Tyr, H-γ4-DiHTyr-OH;
        Xaa2: His;
        Xaa3: Ala;
        Xaa5: Ser, DalloT, Ahb, or H-β3-HSer-OH;
        Xaa6: Ala;
        Xaa7: DPro, DTyr, or DTrp;
        Xaa8: Dab;
        Xaa12: Tyr;
        Xaa13: Gln;
        Xaa14: Lys;
        Xaa15: DCha, NMeDIle, DHis, DHis(Bzl), D4Pal, NMeDTyr, NMeDLys, (ABu)G, DIle, NMeDAla, DTyr, DLys, DDab or DPro;
        Xaa16: Pro, or Oic;

with the proviso that

        Xaa1 is H-γ4-DiHTyr-OH; and/or
        Xaa5 is DalloT, Ahb, or H-β3-HSer-OH; and/or
        Xaa15 is DCha, NMeDIle, DHis, DHis(Bzl), D4 Pal, NMepTyr, NMeDLys, (ABu)G, DIle, NMeDAla, DTyr, DLys, or DDab; and/or
        Xaa16 is Oic.
    
    


If it is desired to exclusively incorporate α-amino acid residues in Cyclo (-Xaa1-Xaa2-Xaa3-Cys4-Xaa5-Xaa6-Xaa7-Xaa8-Arg9-Tyr10-Cys11-Xaa12-Xaa13-Xaa14-Xaa15-Xaa16-), disulfide bond between Cys4 and Cys11, then the α-amino acid residues are preferably

    
    
        Xaa1: Tyr;
        Xaa2: His;
        Xaa3: Ala;
        Xaa5: Ser or D-isomer of type F;
        Xaa6: Ala;
        Xaa7: of formula -A-CO— or D-isomer of type D;
        Xaa8: Dab;
        Xaa12: Tyr;
        Xaa13: Gln;
        Xaa14: Lys;
        Xaa15: of formula -A-CO—, D-isomer of type C, D, E, F, or N-substituted glycine of type I;
        Xaa16: of formula —B—CO—;

with the proviso that

        Xaa5 is the D-isomer of type D; and/or
        Xaa15 is the D-isomer of type C, D, E, or F; or a N-substituted glycine type I; and/or
        Xaa16 is of formula —B—CO— with B being the enantiomer of A105.
    
    


If it is desired to exclusively incorporate α-amino acid residues in Cyclo(-Xaa1-Xaa2-Xaa3-Cys4-Xaa5-Xaa6-Xaa7-Xaa8-Arg9-Tyr10-Cys11-Xaa12-Xaa13-Xaa14-Xaa15-Xaa16-), disulfide bond between Cys4 and Cys11, then the α-amino acid residues are most preferably

    
    
        Xaa1: Tyr;
        Xaa2: His;
        Xaa3: Ala;
        Xaa5: Ser or DalloT;
        Xaa6: Ala;
        Xaa7: DPro, DTyr or DTrp;
        Xaa8: Dab;
        Xaa12: Tyr;
        Xaa13: Gln;
        Xaa14: Lys;
        Xaa15: DCha, NMeDIle, DHis, DHis(Bzl), D4Pal, NMeDTyr, NMeDLys, (ABu)G, DIle, NMecAla, DTyr, DLys, DDab or DPro
        Xaa16: Pro or Oic;

with the proviso that

        Xaa5 is DalloT; and/or
        Xaa15 is DCha, NMeDIle, DHis, DHis (Bzl), D4Pal, NMeDTyr, NMeDLys, (ABu)G, DIle, NMecAla, DTyr, DLys, or DDab; and/or
        Xaa16 is Oic.
    
    


Particularly preferred β-peptidomimetics of the invention include those described in Examples 3, 7 and 12.
The processes of the invention can advantageously be carried out as parallel array syntheses to yield libraries of β-hairpin peptidomimetics of the invention. Such parallel syntheses allow one to obtain arrays of numerous (normally 12 to 192, typically 96) compounds as described above in moderate to high yields and defined purities, minimizing the formation of dimeric and polymeric by-products. The proper choice of the functionalized solid-support (i.e. solid support plus linker molecule) and site of cyclization play thereby key roles.
The functionalized solid support is conveniently derived from polystyrene crosslinked with, preferably 1-5%, divinylbenzene; polystyrene coated with polyethyleneglycol spacers (Tentagel®); and polyacrylamide resins (see also D. Obrecht, J.-M. Villalgordo, “Solid-Supported Combinatorial and Parallel Synthesis of Small-Molecular-Weight Compound Libraries”, Tetrahedron Organic Chemistry Series, Vol. 17, Pergamon, Elsevier Science, 1998).
The solid support is functionalized by means of a linker, i.e. a bifunctional spacer molecule which contains on one end an anchoring group for attachment to the solid support and on the other end a selectively cleavable functional group used for the subsequent chemical transformations and cleavage procedures. For the purposes of the present invention two types of linkers are used:
Type 1 linkers are designed to release the amide group under acid conditions (H. Rink, Tetrahedron Lett. 1987, 28, 3783-3790). Linkers of this kind form amides of the carboxyl group of the amino acids; examples of resins functionalized by such linker structures include 4-[(((2,4-dimethoxy-phenyl)Fmoc-aminomethyl)phenoxyacetamido) aminomethyl] PS resin, 4-[(((2,4-dimethoxyphenyl)Fmoc-aminomethyl)phenoxy-acetamido) aminomethyl]-4-methyl-benzydrylamine PS resin (Rink amide MBHA PS Resin), and 4-[(((2,4-dimethoxy-phenyl)Fmoc-aminomethyl)phenoxyacetamido) aminomethyl]benzhydrylamine PS-resin (Rink amide BHA PS resin). Preferably, the support is derived from polystyrene crosslinked with, most preferably 1-5%, divinylbenzene and functionalized by means of the 4-(((2,4-dimethoxy-phenyl)Fmoc-aminomethyl)phenoxyacetamido) linker.
Type 2 linkers are designed to eventually release the carboxyl group under acidic conditions. Linkers of this kind form acid-labile esters with the carboxyl group of the amino acids, usually acid-labile benzyl, benzhydryl and trityl esters; examples of such linker structures include 2-methoxy-4-hydroxymethylphenoxy (Sasrin® linker), 4-(2,4-dimethoxyphenyl-hydroxymethyl)-phenoxy (Rink linker), 4-(4-hydroxymethyl-3-methoxyphenoxy)butyric acid (HMPB linker), trityl and 2-chlorotrityl. Preferably, the support is derived from polystyrene crosslinked with, most preferably 1-5%, divinylbenzene and functionalized by means of the 2-chlorotrityl linker.
When carried out as parallel array syntheses the processes of the invention can be advantageously carried out as described herein below but it will be immediately apparent to those skilled in the art how these procedures will have to be modified in case it is desired to synthesize one single compound of the invention.
A number of reaction vessels (normally 12 to 192, typically 96) equal to the total number of compounds to be synthesized by the parallel method are loaded with 25 to 1000 mg, preferably 60 mg, of the appropriate functionalized solid support, preferably 1 to 3% cross-linked polystyrene or Tentagel resin.
The solvent to be used must be capable of swelling the resin and includes, but is not limited to, dichloromethane (DCM), dimethylformamide (DMF), N-methylpyrrolidone (NMP), dioxane, toluene, tetrahydrofuran (THF), ethanol (EtOH), trifluoroethanol (TFE), isopropylalcohol and the like. Solvent mixtures containing as at least one component a polar solvent (e.g. 20% TFE/DCM, 35% THF/NMP) are beneficial for ensuring high reactivity and solvation of the resin-bound peptide chains (G. B. Fields, C. G. Fields, J. Am. Chem. Soc. 1991, 113, 4202-4207).
With the development of various linkers that release the C-terminal carboxylic acid group under mild acidic conditions, not affecting acid-labile groups protecting functional groups in the side chain(s), considerable progresses have been made in the synthesis of protected peptide fragments. The 2-methoxy-4-hydroxybenzylalcohol-derived linker (Sasrin® linker, Mergler et al., Tetrahedron Lett. 1988, 29 4005-4008) is cleavable with diluted trifluoroacetic acid (0.5-1% TFA in DCM) and is stable to Fmoc deprotection conditions during the peptide synthesis, Boc/tBu-based additional protecting groups being compatible with this protection scheme. Other linkers which are suitable for the process of the invention include the super acid labile 4-(2,4-dimethoxyphenyl-hydroxymethyl)-phenoxy linker (Rink linker, H. Rink, Tetrahedron Lett. 1987, 28, 3787-3790), where the removal of the depsipeptide requires 10% acetic acid in DCM or 0.2% trifluoroacetic acid in DCM; the 4-(4-hydroxymethyl-3-methoxyphenoxy)butyric acid-derived linker (HMPB-linker, Flörsheimer & Riniker, Peptides 1991, 1990 131) which is also cleaved with 1% TFA/DCM in order to yield a peptide fragment containing all acid labile side-chain protective groups; and, in addition, the 2-chlorotritylchloride linker (Barlos et al., Tetrahedron Lett. 1989, 30, 3943-3946), which allows the peptide detachment using a mixture of glacial acetic acid/trifluoroethanol/DCM (1:2:7) for 30 min.
Suitable protecting groups for α-, β- and γ-amino acids and, respectively, for their residues are, for example,

    
    
        for the amino group (as is present e.g. also in the side-chain of lysine)
        
            Cbz benzyloxycarbonyl
            Boc tert.-butyloxycarbonyl
            Fmoc 9-fluorenylmethoxycarbonyl
            Alloc allyloxycarbonyl
            Teoc trimethylsilylethoxycarbonyl
            Tcc trichloroethoxycarbonyl
            Nps o-nitrophenylsulfonyl;
            Trt triphenymethyl or trityl
        
        
        for the carboxyl group (as is present e.g. also in the side-chain of aspartic and glutamic acid) by conversion into esters with the alcohol components
        
            tBu tert.-butyl
            Bn benzyl
            Me methyl
            Ph phenyl
            Pac phenacyl
            
                allyl
            
            
            Tse trimethylsilylethyl
            Tce trichloroethyl;
        
        
        for the guanidino group (as is present e.g. in the side-chain of arginine)
        
            Pmc 2,2,5,7,8-pentamethylchroman-6-sulfonyl
            Ts tosyl (i.e. p-toluenesulfonyl)
            Cbz benzyloxycarbonyl
            Pbf pentamethyldihydrobenzofuran-5-sulfonyl
        
        
        for the hydroxy group (as is present e.g. in the side-chain of threonine and serine)
        
            tBu tert.-butyl
            Bn benzyl
            Trt trityl
            Alloc allyloxycarbonyl
        
        
        and for the mercapto group (as is present e.g. in the side-chain of cysteine)
        
            Acm acetamidomethyl
            tBu tert.-butyl
            Bn benzyl
            Trt trityl
            Mtr 4-methoxytrityl.
        
        
    
    


The 9-fluorenylmethoxycarbonyl-(Fmoc)-protected amino acid derivatives are preferably used as the building blocks for the construction of the β-hairpin loop mimetics of the invention. For the deprotection, i.e. cleaving off of the Fmoc group, 20% piperidine in DMF or 2% DBU/2% piperidine in DMF can be used.
The quantity of the reactant, i.e. of the amino acid derivative, is usually 1 to 20 equivalents based on the milliequivalents per gram (meq/g) loading of the functionalized solid support (typically 0.1 to 2.85 meq/g for polystyrene resins) originally weighed into the reaction tube. Additional equivalents of reactants can be used, if required, to drive the reaction to completion in a reasonable time. The preferred workstations (without, however, being limited thereto) are Labsource's Combi-chem station, Protein Technologies' Symphony and MultiSyn Tech's-Syro synthesizer, the latter additionally equipped with a transfer unit and a reservoir box during the process of detachment of the fully protected linear peptide from the solid support. All synthesizers are able to provide a controlled environment, for example, reactions can be accomplished at temperatures different from room temperature as well as under inert gas atmosphere, if desired.
Amide bond formation requires the activation of the α-carboxyl group for the acylation step. When this activation is being carried out by means of the commonly used carbodiimides such as dicyclohexylcarbodiimide (DCC, Sheehan & Hess, J. Am. Chem. Soc. 1955, 77, 1067-1068) or diisopropylcarbodiimide (DIC, Sarantakis et al Biochem. Biophys. Res. Commun. 1976, 73, 336-342), the resulting dicyclohexylurea and, respectively, diisopropylurea is insoluble and, respectively, soluble in the solvents generally used. In a variation of the carbodiimide method 1-hydroxybenzotriazole (HOBt, König & Geiger, Chem. Ber. 1970, 103, 788-798) is included as an additive to the coupling mixture. HOBt prevents dehydration, suppresses racemization of the activated amino acids and acts as a catalyst to improve the sluggish coupling reactions. Certain phosphonium reagents have been used as direct coupling reagents, such as benzotriazol-1-yl-oxy-tris-(dimethyl-amino)-phosphonium hexafluorophosphate (BOP, Castro et al., Tetrahedron Lett. 1975, 14, 1219-1222; Synthesis 1976, 751-752), or benzotriazol-1-yl-oxy-tris-pyrrolidino-phosphonium hexafluorophoshate (Py-BOP, Coste et al., Tetrahedron Lett. 1990, 31, 205-208), or 2-(1H-benzotriazol-1-yl-)1,1,3,3-tetramethyluronium tetrafluoroborate (TBTU), or hexafluorophosphate (HBTU, Knorr et al., Tetrahedron Lett. 1989, 30, 1927-1930); these phosphonium reagents are also suitable for in situ formation of HOBt esters with the protected amino acid derivatives. More recently diphenoxyphosphoryl azide (DPPA) or O-(7-aza-benzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium tetrafluoroborate (TATU) or O-(7-aza-benzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophosphate (HATU)/7-aza-1-hydroxy benzotriazole (HOAt, Carpino et al., Tetrahedron Lett. 1994, 35, 2279-2281) or -(6-Chloro-1H-benzotriazol-1-yl-)-N,N,N′,N′-1,1,3,3-tetramethyluronium tetrafluoroborate (TCTU), or hexafluorophosphate (HCTU, Marder, Shivo and Albericio: HCTU and TCTU: New Coupling Reagents: Development and Industrial Applications, Poster Presentation, Gordon Conference February 2002) have also been used as coupling reagents as well as 1,1,3,3-Bis(tetramethylene)chlorouronium hexafluoro-phosphate (PyClU) especially for coupling N-methylated amino acids (J. Coste, E. Frérot, P. Jouin, B. Castro, Tetrahedron Lett. 1991, 32, 1967).
Due to the fact that near-quantitative coupling reactions are essential, it is desirable to have experimental evidence for completion of the reactions. The ninhydrin test (Kaiser et al., Anal. Biochemistry 1970, 34, 595), where a positive colorimetric response to an aliquot of resin-bound peptide or depsipeptide indicates qualitatively the presence of the primary amine, can easily and quickly be performed after each coupling step. Fmoc chemistry allows the spectrophotometric detection of the Fmoc chromophore when it is released with the base (Meienhofer et al., Int. J. Peptide Protein Res. 1979, 13, 35-42).
The resin-bound intermediate within each reaction vessel is washed free of excess of retained reagents, of solvents, and of by-products by repetitive exposure to pure solvent(s) by one of the two following methods:

    1) The reaction vessels are filled with solvent (preferably 5 ml), agitated for 5 to 300 minutes, preferably 15 minutes, and drained to expel the solvent;
    2) The reaction vessels are filled with solvent (preferably 5 ml) and drained into a receiving vessel such as a test tube or vial.


Both of the above washing procedures are repeated up to about 50 times (preferably about 10 times), monitoring the efficiency of reagent, solvent, and by-product removal by methods such as TLC, GC, or inspection of the washings.
The above described procedure of reacting the resin-bound compound with reagents within the reaction tubes followed by removal of excess reagents, by-products, and solvents is repeated with each successive transformation until the final resin-bound fully protected linear depsipeptide has been obtained.
Before this fully protected linear peptide is detached from the solid support, the disulfide bridge between Cys4 and Cys11 of Xaa1-Xaa2-Xaa3-Cys4-Xaa5-Xaa6-Xaa7-Xaa8-Arg9-Tyr10-Cys11-Xaa12-Xaa13-Xaa14-Xaa15-Xaa16 can be formed. For the formation of this disulfide bridge preferably a solution of 10 equivalents of iodine solution is applied in DMF or in a mixture of CH2Cl2/MeOH for 1.5 h which is repeated for another 3 h with a fresh iodine solution after filtering of the iodine solution, or in a mixture of DMSO and acetic acid solution, buffered with 5% NaHCO3 to pH 5-6 for 4 h, or in water after adjusting to pH 8 with ammonium hydroxide solution by stirring for 24 h, or in a solution of NMP and tri-n-butylphosphine (preferably 50 eq.).
Alternatively, the formation of the disulfide bridge between Cys4 and Cys11 of Xaa1-Xaa2-Xaa3-Cys4-Xaa5-Xaa6-Xaa7-Xaa8-Arg9-Tyr10-Cys11-Xaa12-Xaa13-Xaa14-Xaa15-Xaa16 can be carried out subsequent to the work-up method 2), as described herein below, by stirring the crude fully deprotected and cyclized peptide for 24 h in water containing DMSO up to 15% by volume, buffered with 5% NaHCO3 to pH 5-6, or buffered with ammonium acetate to pH 7-8, or adjusted with ammonium hydroxide to pH 8. Following evaporation to dryness Cyclo(-Xaa1-Xaa2-Xaa3-Cys4-Xaa5-Xaa6-Xaa7-Xaa8-Arg9-Tyr10)-Cys11-Xaa12-Xaa13-Xaa14-Xaa15-Xaa16-), disulfide bond between Cys4 and Cys11 is obtained as end-product.
Detachment of the fully protected linear peptide from the solid support is achieved by exposing the loaded resin with a solution of the cleavage reagent (preferably 3 to 5 ml). Temperature control, agitation, and reaction monitoring are implemented as described above. Via a transfer-unit the reaction vessels are connected with a reservoir box containing reservoir tubes to efficiently collect the cleaved product solutions. The resins remaining in the reaction vessels are then washed 2 to 5 times as above with 3 to 5 ml of an appropriate solvent to extract (wash out) as much of the detached products as possible. The product solutions thus obtained are combined, taking care to avoid cross-mixing. The individual solutions/extracts are then manipulated as needed to isolate the final compounds.
Typical manipulations include, but are not limited to, evaporation, concentration, liquid/liquid extraction, acidification, basification, neutralization or additional reactions in solution.
The solutions containing fully protected linear peptide derivatives which have been cleaved off from the solid support and neutralized with a base, are evaporated. Cyclization is then effected in solution using solvents such as DCM, DMF, dioxane, THF and the like. Various coupling reagents which were mentioned earlier can be used for the cyclization. The duration of the cyclization is about 6-48 hours, preferably about 16 hours. The progress of the reaction is followed, e.g. by RP-HPLC (Reverse Phase High Performance Liquid Chromatography). Then the solvent is removed by evaporation, the fully protected cyclic depsipeptide derivative is dissolved in a solvent which is not miscible with water, such as DCM, and the solution is extracted with water or a mixture of water-miscible solvents, in order to remove any excess of the coupling reagent.
Finally, the fully protected peptide derivative is treated with 95% TFA, 2.5% H2O, 2.5% TIS or another combination of scavengers for effecting the cleavage of protecting groups. The cleavage reaction time is commonly 30 minutes to 12 hours, preferably about 2.5 hours.
Alternatively, the detachment and complete deprotection of the fully protected peptide from the solid support can be achieved manually in glass vessels.
After full deprotection one of the following methods can be used for further work-up:

    1) The volatiles are evaporated to dryness and the crude peptide is dissolved in 20% AcOH in water and extracted with isopropyl ether or other solvents which are suitable therefor. The aqueous layer is collected and evaporated to dryness, and the fully deprotected peptide, Cyclo(-Xaa1-Xaa2-Xaa3-Cys4-Xaa5-Xaa6-Xaa7-Xaa8-Arg9-Tyr10-Cys11-Xaa12-Xaa13-Xaa14-Xaa15-Xaa16-), disulfide bond between Cys4 and Cys11, is obtained as end-product;
    2) The deprotection mixture is concentrated under vacuum. Following precipitation of the fully deprotected peptide in diethylether at preferably 0° C. the solid is washed up to about 10 times, preferably 3 times, dried, and the fully deprotected peptide, Cyclo(-Xaa1-Xaa2-Xaa3-Cys4-Xaa5-Xaa6-Xaa7-Xaa8-Arg9-Tyr10-Cys11-Xaa12-Xaa13-Xaa14-Xaa15-Xaa16-), disulfide bond between Cys4 and Cys11, is obtained as end-product, if disulfide bond has been formed on solid support as described herein above.


As mentioned earlier, it is thereafter possible, if desired, to convert the fully deprotected product of Cyclo(-Xaa1-Xaa2-Xaa3-Cys4-Xaa5-Xaa6-Xaa7-Xaa8-Arg9-Tyr10-Cys11-Xaa12-Xaa13-Xaa14-Xaa15-Xaa16-), disulfide bond between Cys4 and Cys11, thus obtained into a pharmaceutically acceptable salt or to convert a pharmaceutically acceptable, or unacceptable, salt thus obtained into the corresponding free compound of Cyclo(-Xaa1-Xaa2-Xaa3-Cys4-Xaa5-Xaa6-Xaa7-Xaa8-Arg9-Tyr10-Cys11-Xaa12-Xaa13-Xaa14-Xaa15-Xaa16-), disulfide bond between Cys4 and Cys11, or into a different, pharmaceutically acceptable, salt. Any of these operations can be carried out by methods well known in the art.
The β-hairpin peptidomimetics of the invention can be used in a wide range of applications in order to prevent HIV infections in healthy individuals and slow or halt viral progression in infected patients, or where cancer is mediated or resulting from the CXCR4 receptor activity, or where immunological diseases are mediated or resulting from CXCR4 receptor activity; or these β-hairpin peptidomimetics can be used to treat immunosuppression, or they can be used during apheresis collections of peripheral blood stem cells and/or as agents to induce mobilization of stem cells to regulate tissue repair.
The β-hairpin peptidomimetics of the invention may be administered per se or may be applied as an appropriate formulation together with carriers, diluents or excipients well known in the art.
When used to treat or prevent HIV infections or cancer such as breast cancer, brain cancer, prostate cancer, heptatocellular carcinoma, colorectal cancer, lung cancer, kidney cancer, neuroblastoma, ovarian cancer, endometrial cancer, germ cell tumor, eye cancer, multiple myeloma, pancreatic cancer, gastric cancer, rhabdomyo-sarcoma, melanoma, chronic lyphomphocytic leukemia, acute myelogenous leukemia, acute lymphoblastic leukemia, multiple myeloma, Non-Hodgkin's lymphoma; metastasis, angiogenesis, and haematopoetic tissues; or inflammatory disorders such as asthma, allergic rhinitis, hypersensitivity lung diseases, hypersensitivity pneumonitis, eosinophilic pneumonias, delayed-type hypersensitivity, interstitial lung diseas (ILD), idiopathic pulmonary fibrosis, ILD associated with rheumatoid arthritis, systemic lupus erythematosus, ankylosing sponylitis, systemic sclerosis, Sjogren's syndrome, systemic anaphylaxis or hypersensitivity responses, drug allergies, rheumatoid arthritis, psoriatic arthritis, systemic lupus erythematosus, myasthenia gravis, juvenile onset diabetes, glomerulonephritis, autoimmune throiditis, graft rejection, including allograft rejection or graft-versus-host disease, inflammatory bowel diseases, inflammatory dermatoses; or to treat glaucoma; or to treat focal ischemic stroke, global cerebral ischemia, myocardial infarction, hind limb ischemia and peripheral ischemia; or to treat injury of the liver, kidney and lung or to treat immunosuppression, including immunosuppression induced by chemotherapy, radiation therapy or graft/transplantation rejection, the β-hairpin peptidomimetics of the invention can be administered singly, as mixtures of several β-hairpin peptidomimetics, in combination with other anti-HIV agents, or antimicrobial agents or anti cancer agents or anti-inflammatory agents, or in combination with other pharmaceutically active agents. The β-hairpin peptidomimetics of the invention can be administered per se or as pharmaceutical compositions.
Pharmaceutical compositions comprising β-hairpin peptidomimetics of the invention may be manufactured by means of conventional mixing, dissolving, granulating, coated tablet-making, levigating, emulsifying, encapsulating, entrapping or lyophilizing processes. Pharmaceutical compositions may be formulated in conventional manner using one or more physiologically acceptable carriers, diluents, excipients or auxilliaries which facilitate processing of the active β-hairpin peptidomimetics into preparations which can be used pharmaceutically. Proper formulation depends upon the method of administration chosen.
For topical administration the β-hairpin peptidomimetics of the invention may be formulated as solutions, gels, ointments, creams, suspensions, etc. as are well-known in the art.
Systemic formulations include those designed for administration by injection, e.g. subcutaneous, intravenous, intramuscular, intrathecal or intraperitoneal injection, as well as those designed for transdermal, transmucosal, oral or pulmonary administration.
For injections, the β-hairpin peptidomimetics of the invention may be formulated in adequate solutions, preferably in physiologically compatible buffers such as Hink's solution, Ringer's solution, or physiological saline buffer. The solutions may contain formulatory agents such as suspending, stabilizing and/or dispersing agents. Alternatively, the β-hairpin peptidomimetics of the invention may be in powder form for combination with a suitable vehicle, e.g., sterile pyrogen-free water, before use.
For transmucosal administration, penetrants appropriate to the barrier to be permeated are used in the formulation as known in the art.
For oral administration, the compounds can be readily formulated by combining the active β-hairpin peptidomimetics of the invention with pharmaceutically acceptable carriers well known in the art. Such carriers enable the β-hairpin peptidomimetics of the invention to be formulated as tablets, pills, dragees, capsules, liquids, gels, syrups, slurries, suspensions etc., for oral ingestion by a patient to be treated. For oral formulations such as, for example, powders, capsules and tablets, suitable excipients include fillers such as sugars, such as lactose, sucrose, mannitol and sorbitol; cellulose preparations such as maize starch, wheat starch, rice starch, potato starch, gelatin, gum tragacanth, methyl cellulose, hydroxypropylmethyl cellulose, sodium carboxymethylcellulose, and/or polyvinylpyrrolidone (PVP); granulating agents; and binding agents. If desired, desintegrating agents may be added, such as cross-linked polyvinylpyrrolidones, agar, or alginic acid or a salt thereof, such as sodium alginate. If desired, solid dosage forms may be sugar-coated or enteric-coated using standard techniques.
For oral liquid preparations such as, for example, suspensions, elixirs and solutions, suitable carriers, excipients or diluents include water, glycols, oils, alcohols, etc. In addition, flavoring agents, preservatives, coloring agents and the like may be added.
For buccal administration, the composition may take the form of tablets, lozenges, etc. formulated as usual.
For administration by inhalation, the β-hairpin peptidomimetics of the invention are conveniently delivered in form of an aeorosol spray from pressurized packs or a nebulizer, with the use of a suitable propellant, e.g. dichlorodifluoromethane, trichlorofluoromethane, carbon dioxide or another suitable gas. In the case of a pressurized aerosol the dose unit may be determined by providing a valve to deliver a metered amount. Capsules and cartridges of e.g. gelatin for use in an inhaler or insufflator may be formulated containing a powder mix of the β-hairpin peptidomimetics of the invention and a suitable powder base such as lactose or starch.
The compounds may also be formulated in rectal or vaginal compositions such as suppositories together with appropriate suppository bases such as cocoa butter or other glycerides.
In addition to the formulations described above, the β-hairpin peptidomimetics of the invention may also be formulated as depot preparations. Such long acting formulations may be administered by implantation (e.g. subcutaneously or intramuscularly) or by intramuscular injection. For the manufacture of such depot preparations the β-hairpin peptidomimetics of the invention may be formulated with suitable polymeric or hydrophobic materials (e.g. as an emulsion in an acceptable oil) or ion exchange resins, or as sparingly soluble salts.
In addition, other pharmaceutical delivery systems may be employed such as liposomes and emulsions well known in the art. Certain organic solvents such as dimethylsulfoxide may also be employed. Additionally, the β-hairpin peptidomimetics of the invention may be delivered using a sustained-release system, such as semipermeable matrices of solid polymers containing the therapeutic agent. Various sustained-release materials have been established and are well known by those skilled in the art. Sustained-release capsules may, depending on their chemical nature, release the compounds for a few weeks up to over 100 days. Depending on the chemical nature and the biological stability of the therapeutic agent, additional strategies for protein stabilization may be employed.
As the β-hairpin pepdidomimetics of the invention may contain charged residues, they may be included in any of the above-described formulations as such or as pharmaceutically acceptable salts. Pharmaceutically acceptable salts tend to be more soluble in aqueous and other protic solvents than are the corresponding free forms.
The β-hairpin peptidomimetics of the invention, or compositions thereof, will generally be used in an amount effective to achieve the intended purpose. It is to be understood that the amount used will depend on a particular application.
For topical administration to treat or prevent HIV infections a therapeutically effective dose can be determined using, for example, the in vitro assays provided in the examples. The treatment may be applied while the HIV infection is visible, or even when it is not visible. An ordinary skilled expert will be able to determine therapeutically effective amounts to treat topical HIV infections without undue experimentation.
For systemic administration, a therapeutically effective dose can be estimated initially from in vitro assays. For example, a dose can be formulated in animal models to achieve a circulating β-hairpin peptidomimetic concentration range that includes the IC50 as determined in the cell culture (i.e. the concentration of a test compound that is lethal to 50% of a cell culture). Such information can be used to more accurately determine useful doses in humans.
Initial dosages can also be determined from in vivo data, e.g. animal models, using techniques that are well known in the art. One having ordinary skill in the art could readily optimize administration to humans based on animal data.
Dosage amounts for applications as anti-HIV agents may be adjusted individually to provide plasma levels of the β-hairpin peptidomimetics of the invention which are sufficient to maintain the therapeutic effect. Therapeutically effective serum levels may be achieved by administering multiple doses each day.
In cases of local administration or selective uptake, the effective local concentration of the β-hairpin peptidomimetics of the invention may not be related to plasma concentration. One having the ordinary skill in the art will be able to optimize therapeutically effective local dosages without undue experimentation.
The amount of β-hairpin peptidomimetics administered will, of course, be dependent on the subject being treated, on the subject's weight, the severity of the affliction, the manner of administration and the judgement of the prescribing physician.
The anti-HIV therapy may be repeated intermittently while infections are detectable or even when they are not detectable. The therapy may be provided alone or in combination with other drugs, such as for example other anti-HIV agents or anti cancer agents, or other antimicrobial agents.
Normally, a therapeutically effective dose of the β-hairpin peptidomimetics described herein will provide therapeutic benefit without causing substantial toxicity.
Toxicity of the β-hairpin peptidomimetics of the invention can be determined by standard pharmaceutical procedures in cell cultures or experimental animals, e.g., by determining the LD50 (the dose lethal to 50% of the population) or the LD100 (the dose lethal to 100% of the population). The dose ratio between toxic and therapeutic effect is the therapeutic index. Compounds which exhibit high therapeutic indices are preferred. The data obtained from these cell culture assays and animal studies can be used in formulating a dosage range that is not toxic for use in humans. The dosage of the β-hairpin peptidomimetics of the invention lies preferably within a range of circulating concentrations that include the effective dose with little or no toxicity. The dosage may vary within the range depending upon the dosage form employed and the route of administration utilized. The exact formulation, route of administration and dose can be chosen by the individual physician in view of the patient's condition (see, e.g. Fingl et al. 1975, In: The Pharmacological Basis of Therapeutics, Ch.1, p. 1).
The following Examples illustrate the present invention but are not to be construed as limiting its scope in any way.


EXAMPLES
1. Peptide Synthesis
Coupling of the First Protected Amino Acid Residue to the Resin
1 g (1.4 mMol) of 2-chlorotritylchloride resin (1.4 mMol/g; Barlos et al. Tetrahedron Lett. 1989, 30, 3943-3946) was filled into a dried flask. The resin was suspended in CH2Cl2 (5 ml) and allowed to swell at room temperature under constant shaking for 30 min. A solution of 0.98 mMol (0.7 eq) of the first suitably protected amino acid residue (see below) in CH2Cl2 (5 ml) completed by 960 μl (4 eq) of diisopropylethylamine (DIEA) was added. After shaking the reaction mixture for 4 hours at 25° C. the resin was filtered off and washed successively with CH2Cl2 (1×), DMF (1×) and CH2Cl2 (1×). A solution of CH2Cl2/MeOH/DIEA (17/2/1, 10 ml) was added to the resin and the suspension was shaken for 30 min. After filtration the resin was washed in the following order with CH2Cl2 (1×), DMF (1×), CH2Cl2 (1x), MeOH (1×), CH2Cl2 (1×), MeOH (1×), CH2Cl2 (2×), Et2O (2×) and dried under vacuum for 6 hours.
Loading was typically 0.6-0.7 mMol/g.
The following preloaded resins were prepared:

    Fmoc-ProO-chlorotrityl resin, Fmoc-OicO-chlorotrityl resin, and
    Fmoc-AlaO-chlorotrityl resin.


The synthesis was carried out employing a Syro-peptide synthesizer (MultiSynTech) using 24-96 reaction vessels. In each vessel 0.04 mMol of the above resin were placed and the resin was swollen in CH2Cl2 and DMF for 15 min, respectively. The following reaction cycles were programmed and carried out:












Step
Reagent
Time







1
DMF, wash
2 × 1 min


2
20% piperidine/DMF
1 × 5 min, 1 × 15 min


3
DMF, wash
5 × 1 min


4a
5 eq Fmoc amino acid/DMF +
1 × 60 min 



5 eq HCTU/DMF, 10 eq DIEA/DMF


5
DMF, wash
3 × 1 min









Step 4a was repeated once.
Unless indicated otherwise, the final coupling of an amino acid was followed by a Fmoc deprotection by applying steps 1-3 of the above described reaction cycle.
To introduce a N-substituted glycine building block into position Xaa15 the following steps 4b.1-4-b.3 were used instead of step 4a:














4b.1
11 eq BrCH2COOH/DMF + 13 eq DIC
1 × 90 min


4b.2
DMF, wash
 4 × 2 min


4b.3
20 eq amine building block
1 × 120 min 



with protective residue/DMF









Moreover, if a N-substituted glycine building block had been introduced in the previous cycle, step 4a was modified as follows:

















4c
5 eq Fmoc amino acid/DMF +
1 × 120 min




3.5 eq HATU/DMF, 7 eq DIEA/DMF










To introduce a N-Methyl-substituted amino acid building block into position Xaa15 the following steps 4d.1-4d.10 were used instead of step 4a:

















4d.1
5 eq oNBS-Cl, 10 eq Collidine/NMP
2 × 15 min 



4d.2
NMP, wash
2 × 1 min



4d.3
DMF, wash
2 × 1 min



4d.4
THF, wash
2 × 1 min



4d.5
5 eq Ph3P, MeOH/THF 1:1 [v/v],
2 × 20 min 




5 eq DIAD



4d.6
THF, wash
3 × 1 min



4d.7
NMP, wash
2 × 1 min



4d.8
10 eq Mercaptoethanol, 5 eq DBU/NMP
3 × 10 min 



4d.9
NMP, wash
3 × 1 min



4d.10
DMF, wash
2 × 1 min










Furthermore, if a N-Methyl-substituted amino acid building block had been introduced in the previous cycle, steps 1-3 were skipped and step 4a was modified as follows:

















4e
3 eq Fmoc amino acid/DMF +
2 × 60 min




3 eq PyClU/DMF, 5 eq DIEA/DMF










Cyclization and Work Up of Backbone Cyclized Peptides

Cleavage of the Fully Protected Peptide Fragment

After completion of the synthesis, the resin (0.04 mMol) was suspended in 1 ml (0.13 mMol, 3.4 eq) of 1% TFA in CH2Cl2 (v/v) for 3 minutes, filtered, and the filtrate was neutralized with 1 ml (0.58 mMol, 14.6 eq) of 10% DIEA in CH2Cl2 (v/v). This procedure was repeated three times to ensure completion of the cleavage. The filtrate was evaporated to dryness and a sample of the product was fully deprotected by using a cleavage mixture containing 95% trifluoroacetic acid (TFA), 2.5% water and 2.5% triisopropylsilane (TIS) to be analyzed by reverse phase-HPLC (column C18) and ESI-MS to monitor the efficiency of the linear peptide synthesis.
Cyclization of the Linear Peptide
The fully protected linear peptide (0.04 mMol) was dissolved in DMF (4 μMol/ml). Then 30.4 mg (0.08 mMol, 2 eq) of HATU, 10.9 mg (0.08 mMol, 2 eq) of HOAt and 28 μl (0.16 mMol, 4 eq) DIEA were added, and the mixture was vortexed at 25° C. for 16 hours and subsequently concentrated under high vacuum. The residue was partitioned between CH2Cl2 and H2O/CH3CN (90/10: v/v). The CH2Cl2 phase was evaporated to yield the fully protected cyclic peptide.
Full Deprotection of the Cyclic Peptide
The cyclic peptide obtained was dissolved in 3 ml of the cleavage mixture containing 82.5% trifluoroacetic acid (TFA), 5% water, 5% thioanisole, 5% phenol and 2.5% ethandithiole (EDT). The mixture was allowed to stand at 25° C. for 2.5 hours and thereafter concentrated under vacuum. After precipitation of the cyclic fully deprotected depsipeptide in diethylether (Et2O) at 0° C. the solid was washed twice with Et2O and dried.
Formation of Disulfide β-Strand Linkage and Purification
After full deprotection, the crude peptide was dissolved in 0.1 M ammonium acetate buffer (1 mg/1 ml, pH=7-8). DMSO (up to 5% by volume) was added and the solution was shaken overnight. Following evaporation the residue was purified by preparative reverse phase HPLC.
Analytical Method:
Analytical HPLC retention times (RT, in minutes) were determined using an Xbridge C18 2.5 μm column with the following solvents A (H2O+0.1% TFA) and B (CH3CN+0.09% TFA) and the gradient: 0 min: 97% A, 3% B; 3 min: 3% A, 97% B; 3.01-3.6 min: 3% A, 97% B; 3.7 min: 97% A, 3% B; 3.71-4.3 min: 97% A, 3% B.
Examples 1-4, 6-15, 17-18 and 20 are shown in Table 1. The peptides were synthesized starting with the amino acid Pro (Xaa16) which was grafted to the resin. Starting resin was Fmoc-ProO-chlorotrityl resin, which was prepared as described above. The linear peptides were synthesized on solid support according to the procedure described above in the following sequence: Resin-Pro16-Xaa15-Xaa14-Xaa13-Xaa12-Cys11-Tyr10-Arg9-Xaa8-Xaa7-Xaa6-Xaa5-Cys4-Xaa3-Xaa2-Xaa1.
Following a final Fmoc deprotection as described above, the peptides were cleaved from the resin, cyclized, deprotected and after formation of the disulfide β-strand linkage purified as indicated above.
HPLC-retention times (minutes) were determined using the gradient method as described above.
Example 5 is shown in Table 1, too. The peptide was synthesized starting with the amino acid Dab (Xaa8) which was grafted to the resin. Starting resin was Fmoc-Dab(Boc)O-chlorotrityl resin, which was prepared as described above. The linear peptide was synthesized on solid support according to the procedure described above in the following sequence: Resin-Dab8-Xaa7-Xaa6-Xaa5-Cys4-Xaa3-Xaa2-Xaa1-Xaa16-Xaa15-Xaa14-Xaa13-Xaa12-Cys11-Tyr10-Arg9. Following a final Fmoc deprotection as described above, the peptide was cleaved from the resin, cyclized, deprotected and after formation of the disulfide β-strand linkage purified as indicated above.
HPLC-retention time (minutes) was determined using the gradient method as described above
Example 16 is likewise shown in Table 1. The peptide was synthesized starting with the amino acid Oic (Xaa16) which was grafted to the resin. Starting resin was Fmoc-OicO-chlorotrityl resin, which was prepared as described above. The linear peptide was synthesized on solid support according to the procedure described above in the following sequence: Resin-Oic 16-Xaa15-Xaa14-Xaa13-Xaa12-Cys11-Tyr10-Arg9-Xaa8-Xaa7-Xaa6-Xaa5-Cys4-Xaa3-Xaa2-Xaa1. Following a final Fmoc deprotection as described above, the peptide was cleaved from the resin, cyclized, deprotected and after formation of the disulfide β-strand linkage purified as indicated above.
HPLC-retention time (minutes) was determined using the gradient method as described above
Example 19 is shown in Table 1 as well. The peptide was synthesized starting with the amino acid Ala (Xaa3) which was grafted to the resin. Starting resin was Fmoc-AlaO-chlorotrityl resin, which was prepared as described above. The linear peptide was synthesized on solid support according to the procedure described above in the following sequence: Resin-Ala3-Xaa2-Xaa1-Xaa16-Xaa15-Xaa14-Xaa13-Xaa12-Cys11-Tyr10-Arg9-Xaa8-Xaa7-Xaa6-Xaa5-Cys4. Following a final Fmoc deprotection as described above, the peptide was cleaved from the resin, cyclized, deprotected and after formation of the disulfide β-strand linkage purified as indicated above.
HPLC-retention times (minutes) was determined using the gradient method as described above.







TABLE 1







Examples (Ex.)








Ex.

























Ex.
Seq ID
Xaa1
Xaa2
Xaa3
Cys4
Xaa5
Xaa6
Xaa7
Xaa8
Arg9
Tyr10
Cys11
Xaa12
Xaa13
Xaa14
Xaa15
Xaa16





 1.
SEQ ID NO: 1
Tyr
His
Ala
Cys
Ser
Ala
DPro
Dab
Arg
Tyr
Cys
Tyr
Gln
Lys
DCha
Pro


 


 2.
SEQ ID NO: 2
Tyr
His
Ala
Cys
Ser
Ala
DPro
Dab
Arg
Tyr
Cys
Tyr
Gln
Lys
NMeDIle
Pro


 


 3.
SEQ ID No: 3
Tyr
His
Ala
Cys
Ser
Ala
DPro
Dab
Arg
Tyr
Cys
Tyr
Gln
Lys
DTyr
Pro


 


 4.
SEQ ID NO: 4
Tyr
His
Ala
Cys
Ser
Ala
DPro
Dab
Arg
Tyr
Cys
Tyr
Gln
Lys
DHis
Pro


 


 5.
SEQ ID NO: 5
Tyr
His
Ala
Cys
Ser
Ala
DPro
Dab
Arg
Tyr
Cys
Tyr
Gln
Lys
DHis(Bzl)
Pro


 


 6.
SEQ ID NO: 6
Tyr
His
Ala
Cys
Ser
Ala
DPro
Dab
Arg
Tyr
Cys
Tyr
Gln
Lys
D4Pal
Pro


 


 7.
SEQ ID NO: 7
Tyr
His
Ala
Cys
Ser
Ala
DPro
Dab
Arg
Tyr
Cys
Tyr
Gln
Lys
NMeDTyr
Pro


 


 8.
SEQ ID NO: 8
Tyr
His
Ala
Cys
Ser
Ala
DPro
Dab
Arg
Tyr
Cys
Tyr
Gln
Lys
NMeDLys
Pro


 


 9.
SEQ ID NO: 9
Tyr
His
Ala
Cys
Ser
Ala
DPro
Dab
Arg
Tyr
Cys
Tyr
Gln
Lys
(ABu)G
Pro


 


10.
SEQ ID NO:
Tyr
His
Ala
Cys
Ser
Ala
DTyr
Dab
Arg
Tyr
Cys
Tyr
Gln
Lys
DIle
Pro



10


















 


11.
SEQ ID NO:
Tyr
His
Ala
Cys
Ser
Ala
DTrp
Dab
Arg
Tyr
Cys
Tyr
Gln
Lys
DIle
Pro



11


















 


12.
SEQ ID NO:
Tyr
His
Ala
Cys
Ser
Ala
DTyr
Dab
Arg
Tyr
Cys
Tyr
Gln
Lys
NMeDAla
Pro



12


















 


13.
SEQ ID NO:
Tyr
His
Ala
Cys
Ser
Ala
DTyr
Dab
Arg
Tyr
Cys
Tyr
Gln
Lys
DTyr
Pro



13


















 


14.
SEQ ID NO:
Tyr
His
Ala
Cys
Ser
Ala
DTyr
Dab
Arg
Tyr
Cys
Tyr
Gln
Lys
DLys
Pro



14


















 


15.
SEQ ID NO:
Tyr
His
Ala
Cys
Ser
Ala
DTyr
Dab
Arg
Tyr
Cys
Tyr
Gln
Lys
DDab
Pro



15


















 


16.
SEQ ID NO:
Tyr
His
Ala
Cys
Ser
Ala
DPro
Dab
Arg
Tyr
Cys
Tyr
Gln
Lys
DPro
Oic



16


















 


17.
SEQ ID NO:
Tyr
His
Ala
Cys
DalloT
Ala
DPro
Dab
Arg
Tyr
Cys
Tyr
Gln
Lys
DPro
Pro



17


















 


18.
SEQ ID NO:
γ4Yb)
His
Ala
Cys
Ser
Ala
DPro
Dab
Arg
Tyr
Cys
Tyr
Gln
Lys
DPro
Pro



18


















 


19.
SEQ ID NO:
Tyr
His
Ala
Cys
Ahb
Ala
DPro
Dab
Arg
Tyr
Cys
Tyr
Gln
Lys
DPro
Pro



19


















 


20.
SEQ ID NO:
Tyr
His
Ala
Cys
β3Sc)
Ala
DPro
Dab
Arg
Tyr
Cys
Tyr
Gln
Lys
DPro
Pro



20





Cys in pos.4 and11 in Ex. 1-20 form a disulfide bridge,


b)γ4Y: H-γ4-DiFITyr-OH


c)β3S:H-β3-HSer-OH


















TABLE 2







Ex.
Purity [%]a)
(M + 2H)/2
RT





















1
95
960.8
1.86



2
95
947.8
1.72



3
95
965.7
1.59



4
95
952.7
1.55



5
95
997.7
1.64



6
95
958.3
1.55



7
95
972.8
1.64



8
88
955.2
1.52



9
95
948.3
1.53



10
95
973.8
1.72



11
95
985.3
1.76



12
95
959.8
1.60



13
95
998.8
1.66



14
95
981.2
1.57



15
91
967.5
1.56



16
95
960.0
1.72



17
95
939.4
1.61



18
95
946.7
1.61



19
95
939.5
1.62



20
95
939.4
1.58







a)%-purity of compounds after prep. HPLC.






2. Biological Methods

2.1. Preparation of the Peptides

Lyophilized peptides were weighed on a Microbalance (Mettler MT5) and dissolved in sterile water to a final concentration of 1 mM or dissolved in DMSO to a final concentration of 10 mM. Stock solutions were kept at +4° C., light protected. In case of DMSO stock solutions the biological assays were carried out under assay conditions having less than 1% DMSO.
2.2. Cell Culture
Mouse pre-B cells were cultured in RPMI1640 plus 5% FBS, antibiotic/antimycotic, non essential amino acid, 50 μM β-mercaptoethanol and 1 mM natrium pyruvate. HELA cells were maintained in RPMI1640 plus 10% FBS, pen/strept and 2 mM L-glutamine. Cos-7 cells were grown in DMEM medium with 4500 mg/mL glucose supplemented with 10% FCS, pen/strept and 2 mM L-glutamine. All cell lines were grown at 37° C. at 5% CO2. Cell media, media supplements, PBS-buffer, HEPES, antibiotic/antimycotic, pen/strept, non essential amino acid, L-glutamine, β-mercaptoethanol and sera were purchased from Gibco (Pailsey, UK). All fine chemicals were supplied by Merck (Darmstadt, Germany).
2.3. Ca2+-Assay: CXCR4-Antagonizing Activity of the Peptides
Increases in intracellular calcium were monitored using a Flexstation 384 (Molecular Devices, Sunnyvale, Calif.) to assay the depsipeptides for CXCR4 antagonism in a mouse pre-B cell line 300-19 stably transfected with human CXCR4 (E. Oberlin, A. Amara, F. Bachelerie, C. Bessia, J.-L. Virelizier, F. Arenzana-Seisdedos, O. Schwartz, J.-M. Heard, I. Clark-Lewis, D. F. Legler, M. Loetscher, M. Baggiolini, B. Moser, Nature 1996, 382, 833-835; M. Loetscher, T. Geiser, T. O'Reilly, R. Zwalen, M. Baggiolini, B. Moser, J. Biol. Chem. 1994, 269, 232-237; M. D'Apuuo, A. Rolink, M. Loetscher, J. A. Hoxie, I. Clark-Lewis, F. Melchors, M. Baggiolini, B. Moser, Eur. J. Immunol. 1997, 27, 1788-1793). The cells were batch loaded with the Calcium 4 Assay kit (Molecular Devices) in assay buffer (Hanks Balanced salt solution [HBSS], 20 mM HEPES, pH 7.4, 0.1% BSA) for 1 h at room temperature and labeled cells were dispensed into black 96 well assays plates (Costar No. 3603). Calcium mobilization induced by stromal-derived factor-1 (SDF-1) was measured in the Flexstation 384 (excitation: 485 nm; emission: 525 nm) for 90 seconds. Antagonist activity of peptides was determined by spiking the cells with compounds prior to SDF-1 addition. Dose response curves (compound concentration versus % maximum response for SDF-1) were determined for each antagonist and IC50 values were calculated by fitting the data to a four parameter logistic equation using SoftmaxPro 4.8 (Molecular Devices).
2.4. Cytotoxicity Assay
The cytotoxicity of the depsipeptides to HELA cells (Acc57) and COS-7 cells (CRL-1651) was determined using the MTT reduction assay (T. Mossman, J. Immunol. Meth. 1983, 65, 55-63; M. V. Berridge, A. S. Tan, Arch. Biochem. Biophys. 1993, 303, 474-482). Briefly, the method was as follows: 7000 HELA cells/well and 4500 COS-7 cells/well were seeded and grown in 96-well microtiter plates for 24 h at 37° C. at 5% CO2. Thereafter, time zero (Tz) was determined by MTT reduction (see below). The supernatant of the remaining wells was discarded, and fresh medium and compounds in serial dilutions (12.5, 25 and 50 μM, triplicates) were pipetted into the wells. After incubation of the cells for 48 h at 37° C. at 5% CO2 the supernatant was discarded again and 100 μL MTT reagent (0.5 mg/mL in RPMI1640 and DMEM, respectively)/well was added. Following incubation at 37° C. for 2 h the media were aspirated and the cells were spiked (100 μL isopropanol/well). The absorbance of the solubilized formazan was measured at 595 nm (OD595peptide). For each concentration averages were calculated from triplicates. The percentage of growth was calculated as follows: (OD595peptide-OD595Tz-OD595Empty well)/(OD595Tz-OD595Empty well)×100%. The GI50 (Growth Inhibition) concentrations were calculated for each depsipeptide by using a trend line function for the concentrations (50, 25, 12.5 and 0 μM), the corresponding percentages and the value 50, (=TREND (C50:C0, %50:%0, 50).
2.5. Hemolysis
The peptides were tested for their hemolytic activity against human red blood cells (hRBC). Fresh hRBC were washed three times with phosphate buffered saline (PBS) and centrifuged for 10 min at 2000×g. Compounds (100 μM) were incubated with 20% hRBC (v/v) for 1 h at 37° C. The final erythrocyte concentration was approximately 0.9×109 cells/mL. A value of 0% and 100% cell lyses, respectively, was determined by incubation of hRBC in the presence of PBS alone and 0.1% Triton X-100 in H2O, respectively. The samples were centrifuged, the supernatants were 20-fold diluted in PBS buffer and the optical densities (OD) were measured at 540 nm. The 100% lyses value (OD540H2O) gave an OD540 of approximately 1.3-1.8.
Percent hemolysis was calculated as follows: (OD540peptide/OD540H2O)×100%.
2.6. Plasma Stability
The stability of the peptides in human and mouse plasma was determined by applying the following method: 315 μL/deep well of freshly thawed human plasma (Basler Blutspende-dienst) and mouse plasma (Harlan Sera-Lab, UK), respectively, were spiked with 35 μL/well of compound in PBS (100 μM, triplicate) and incubated at 37° C. At t=0, 15, 30, 60, 120 and 240 min aliquots of 50 μL were transferred to filtration plate wells containing 150 μL/well of acetonitrile. Following shaking for 2 min the occurred suspensions were filtrated by vacuum and finally, 100 μL of each filtrate were transferred to a propylene microtiter plate, and analyzed by LC/MS as follows: Column: Waters, XBridge C18, mobile phases: (A) water+0.1% formic acid and (B) acetonitrile/water, 95/5 (v/v)+0.1% formic acid, gradient: 5%-100% (B) in 2 minutes, electrospray ionization, MRM detection (triple quadrupole). The peak areas were determined and triplicate values are averaged. The stability is expressed in percent of the initial value at t=0. (tx/to×100). By using the TREND function of EXCEL (Microsoft Office 2003) T1/2 were determined.










TABLE 3







Ex.
IC50% [nM] ± SD, CXCR4 receptor



















1
1.30 ± 0.4



2
1.22 ± 1.0



3
1.94 ± 0.5



4
0.52 ± 0.3



5
0.92 ± 0.2



6
0.17 ± 0.1



7
0.33 ± 0.1



8
0.31 ± 0.2



9
 0.09 ± 0.05



10
1.18 ± 0.4



11
 0.17 ± 0.02



12
 0.10 ± 0.02



13
0.82 ± 0.2



14
 0.14 ± 0.01



15
 0.29 ± 0.16



16
1.46 ± 1.6



17
2.45 ± 1.0



18
0.39 ± 0.5



19
 1.1 ± 0.6



20
2.66 ± 2.2





















TABLE 4









Cytotoxicity

Plasmastability













Hela
Cos-7
Hemolysis
human pl.
mouse pl.



Cells GI50
Cells GI50
at 100 μM
T1/2
T1/2


Ex.
[μM]
[μM]
[%]
[min]
[min]















1
>50
>50
0
240
240


2
>50
>50
0.6
240
240


3
>50
>50
0.1
240
240


4
>50
>50
1.9
240
240


5
>50
>50
1
240
240


6
>50
>50
2.4
240
240


7
>50
>50
0.6
240
240


8
>50
>50
0.3
240
240


9
>50
>50
2.1
240
240


10
>50
>50
0
240
240


11
>50
>50
1.7
240
240


12
>50
>50
0.9
240
240


13
>50
>50
0.7
240
240


14
>50
>50
1
240
240


15
>50
>50
0.6
240
240


16
>50
>50
0.5
240
240


17
>50
>50
1
240
240


18
>50
>50
1.4
240
240


19
>50
>50
1.8
240
240


20
>50
>50
0.6
240
240

## Claims

1. Compounds of the general formula Cyclo(-Xaa1-Xaa2-Xaa3-Cys4-Xaa5-Xaa6-Xaa7-Xaa8-Arg9-Tyr10-Cys11-Xaa12-Xaa13-Xaa14-Xaa15-Xaa16-), disulfide bond between Cys4 and Cys11, wherein the amino acid residues are:
Xaa1: Tyr, H-γ4-DiHTyr-OH;
Xaa2: His;
Xaa3: Ala;
Xaa5: D, alloT, Ahb, or H-β3-HSer-OH;
Xaa6: Ala;
Xaa7: DPro, DTyr, or DTrp;
Xaa8: Dab;
Xaa12: Tyr;
Xaa13: Gln;
Xaa14: Lys;
Xaa15: DCha, NMeDIle, DHis, DHis(Bzl), D4Pal, NMeDTyr, NMeDLys, (ABu)G, DIle, NMeDAla, DTyr, DLys, DDab or DPro;
Xaa16: Pro, or Oic.

2. Compounds according to claim 1, wherein the amino acid residues are exclusively α-amino acid residues, and wherein the α-amino acid residues are:
Xaa1: Tyr;
Xaa2: His;
Xaa3: Ala;
Xaa5: DalloT;
Xaa6: Ala;
Xaa7: DPro, DTyr or DTrp;
Xaa8: Dab;
Xaa12: Tyr;
Xaa13: Gln;
Xaa14: Lys;
Xaa15: DCha, NMeDIle, DHis, DHis(Bzl), D4Pal, NMeDTyr, NMeDLys, (ABu)G, DIle, NMeDAla, DTyr, DLys, DDab or DPro
Xaa16: Pro or Oic.

3. Enantiomers of the compounds as defined in claim 1.

4. A pharmaceutical composition containing a compound according to claim 1 and a pharmaceutically inert carrier.

5. Compositions according to claim 4 in a form suitable for oral, topical, transdermal, injection, buccal, transmucosal, pulmonary or inhalation administration.

6. Compositions according to claim 4 or 5 in form of tablets, dragees, capsules, solutions, liquids, gels, plaster, creams, ointments, syrup, slurries, suspensions, spray, nebuliser or suppositories.

7. A CXCR4 antagonizing medicament, comprising the compounds according to claim 1.

8. A process for the manufacture of compounds according to claim 1, which process comprises:
(a) coupling an appropriately functionalized solid support with an appropriately N-protected derivative of that amino acid which in the desired end-product corresponds to Xaan, wherein n is 16, 8, 7, 6, or 3, any functional group which may be present in said N-protected amino acid derivative being likewise appropriately protected;
(b) removing the N-protecting group from the product thus obtained;
(c) coupling the product thus obtained with an appropriately N-protected derivative of that amino acid which in the desired end-product corresponds to Xaan−1, any functional group which may be present in said N-protected amino acid derivative being likewise appropriately protected;
(d) removing the N-protecting group from the product obtained in step (c);
(e) effecting steps substantially corresponding to steps (c) and (d) using appropriately N-protected derivatives of amino acids which in the desired end-product are in positions n-2 to 1, any functional group(s) which may be present in said N-protected amino acid derivatives being likewise appropriately protected;
(f) if n is not 16,further effecting steps substantially corresponding to steps (c) and (d) using appropriately N-protected derivatives of amino acids which in the desired end-product are in positions 16 to n+1, any functional group(s) which may be present in said N-protected amino acid derivatives being likewise appropriately protected;
(g) forming an interstrand linkage between side-chains of Cys at positions P4 and P11; or alternatively, forming the aforesaid linkage subsequent to step (j), as described herein below;
(h) detaching the product thus obtained from the solid support;
(i) cyclizing the product cleaved from the solid support;
(j) removing any protecting groups present on functional groups of any members of the chain of amino acid residues and, if desired, any protecting group(s) which may in addition be present in the molecule; and
(k) if desired, converting the product thus obtained into a pharmaceutically acceptable salt or converting a pharmaceutically acceptable, or unacceptable, salt thus obtained into the corresponding free compound or into a different, pharmaceutically acceptable, salt.

9. A modification of the processes claim 8 for the manufacture of compounds according to claim 3 in which enantiomers of all chiral starting materials are used.

10. Compounds according to claim 1, wherein the amino acid residues are:
Xaa1 is H-γ4-DiHTyr-OH; and/or
Xaa5 is DalloT, Ahb, or H-β3-HSer-OH; and/or
Xaa15 is DCha, NMeDIle, DHis, DHis(Bzl), D4Pal, NMeDTyr, NMeDLys, (ABu)G, DIle, NMeDAla, DTyr, DLys, or DDab; and/or
Xaa16 is Oic.

11. Compounds according to claim 2, wherein the amino acid residues are:
Xaa5 is DalloT; and/or
Xaa15 is DCha, NMeDIle, DHis, DHis(Bzl), D4Pal NMeDTyr, NMeDLys, (ABu)G, DIle, NMeDAla, DTyr, DLys, or DDab; and/or
Xaa16 is Oic.