1
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Strappaghetti G, Mastrini L, Lucacchini A, Giannaccini G, Betti L, Fabbrini L. Synthesis and biological affinity of new imidazo- and indol-arylpiperazine derivatives: further validation of a pharmacophore model for alpha(1)-adrenoceptor antagonists. Bioorg Med Chem Lett 2008; 18:5140-5. [PMID: 18760923 DOI: 10.1016/j.bmcl.2008.07.084] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2008] [Revised: 07/18/2008] [Accepted: 07/19/2008] [Indexed: 11/29/2022]
Abstract
In the continuing search for selective alpha(1)-adrenoceptor (AR) antagonists, new alkoxyarylpiperazinylalkylpyridazinone derivatives were designed and synthesized. The new compounds were tested for their affinity toward alpha(1)-AR, alpha(2)-AR and 5-HT(1A) receptors. The ability of these compounds to inhibit the serotonin transporters (SERT) was also determined. The pharmacological data confirm that increasing the size of the ortho alkoxy substituent on the phenyl ring of the arylpiperazine moiety afforded compounds with enhanced affinity toward the alpha(1)-AR. The isopropoxy group, the largest group evaluated, led the best alpha(1)-AR affinity profile. In contrast, the compounds which have an amide group within of the o-alkoxy-phenylpiperazine fragment showed low affinity toward the receptors studied. Similar results were obtained when the amide group was present in the linker of the junction between the two major constituents of the molecule.
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Affiliation(s)
- Giovannella Strappaghetti
- Dipartimento di Chimica e Tecnologia del Farmaco, Università degli Studi di Perugia, via del Liceo 1, 06123 Perugia, Italy.
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2
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Strappaghetti G, Brodi C, Giannaccini G, Betti L. New 4-(4-methyl-phenyl)phthalazin-1(2H)-one derivatives and their effects on α1-receptors. Bioorg Med Chem Lett 2006; 16:2575-9. [PMID: 16545955 DOI: 10.1016/j.bmcl.2006.02.068] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2005] [Revised: 02/16/2006] [Accepted: 02/17/2006] [Indexed: 10/24/2022]
Abstract
Continuing our research aimed at obtaining new compounds with high affinity and selectivity toward alpha(1)-AR, a new series of arylpiperazine derivatives was designed, synthesized, and biologically tested. The new compounds 1-17 are characterized by a phenylphthalazin-1(2H)-one fragment connected through an alkyl chain to an arylpiperazine residue. The pharmacological profile of these compounds was evaluated for their affinity and selectivity toward alpha(1)-AR, alpha(2)-AR and toward 5HT(1A) serotoninergic receptor. A discussion on the structure-activity relationship (SAR) of these compounds is also reported.
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Affiliation(s)
- Giovannella Strappaghetti
- Dipartimento di Chimica e Tecnologia del Farmaco, Università degli Studi di Perugia, Via del Liceo 1, 06123 Perugia, Italy.
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3
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Maccari L, Magnani M, Strappaghetti G, Corelli F, Botta M, Manetti F. A Genetic-Function-Approximation-Based QSAR Model for the Affinity of Arylpiperazines toward α1 Adrenoceptors. J Chem Inf Model 2006; 46:1466-78. [PMID: 16711766 DOI: 10.1021/ci060031z] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The genetic function approximation (GFA) algorithm has been used to derive a three-term QSAR equation able to correlate the structural properties of arylpiperazine derivatives with their affinity toward the alpha1 adrenoceptor (alpha1-AR). The number of rotatable bonds, the hydrogen-bond properties, and a variable belonging to a topological family of descriptors (chi) showed significant roles in the binding process toward alpha1-AR. The new model was also compared to a previous pharmacophore for alpha1-AR antagonists and a QSAR model for alpha2-AR antagonists with the aim of finding common or different key determinants influencing both affinity and selectivity toward alpha1- and alpha2-AR.
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Affiliation(s)
- Laura Maccari
- Dipartimento Farmaco Chimico Tecnologico, Università degli Studi di Siena, Via Alcide de Gasperi, 2, I-53100 Siena, Italy
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4
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Betti L, Zanelli M, Giannaccini G, Manetti F, Schenone S, Strappaghetti G. Synthesis of new piperazine–pyridazinone derivatives and their binding affinity toward α1-, α2-adrenergic and 5-HT1A serotoninergic receptors. Bioorg Med Chem 2006; 14:2828-36. [PMID: 16376083 DOI: 10.1016/j.bmc.2005.12.009] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2005] [Revised: 11/25/2005] [Accepted: 12/02/2005] [Indexed: 11/20/2022]
Abstract
We report the design and synthesis of a new class of piperazine-pyridazinone analogues. The arylpiperazine moiety, the length of the spacer, and the terminal molecular fragment were varied to evaluate their influence in determining the affinity of the new compounds toward the alpha1-adrenergic receptor (alpha1-AR), alpha2-adrenergic receptor (alpha2-AR), and the 5-HT1A serotoninergic receptor (5-HT1AR). Biological data showed that most of the compounds have an alpha1-AR affinity in the nanomolar or subnanomolar range, while affinity toward the other two receptors was lower in most cases. However, several of the tested compounds also showed very good (in the nanomolar range) or moderate affinity toward the 5-HT1AR subtype.
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Affiliation(s)
- Laura Betti
- Dipartimento di Psichiatria, Neurobiologia, Farmacologia e Biotecnologie, Università di Pisa, Via Bonanno 6, I-56126 Pisa, Italy
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5
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Betti L, Floridi M, Giannaccini G, Manetti F, Paparelli C, Strappaghetti G, Botta M. Design, synthesis, and α1-adrenoceptor binding properties of new arylpiperazine derivatives bearing a flavone nucleus as the terminal heterocyclic molecular portion. Bioorg Med Chem 2004; 12:1527-35. [PMID: 15018926 DOI: 10.1016/j.bmc.2003.12.033] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2003] [Accepted: 12/16/2003] [Indexed: 11/15/2022]
Abstract
Following our research project aimed at obtaining new compounds with high affinity and selectivity toward alpha(1)-adrenoceptors (AR), a new class of piperazine derivatives was designed, synthesized and biologically tested. The new compounds 1-13 are characterized by a flavone system linked, through an ethoxy or propoxy spacer, to a phenyl- or pyridazinone-piperazine moiety. Biological data showed an interesting profile for the phenylpiperazine subclass found to have a nanomolar affinity toward alpha(1)-AR, and less pronounced affinity for alpha(2)-AR and the 5-HT(1A) serotoninergic receptor. A discussion on the structure-activity relationship (SAR) of such compounds is also reported, on the basis of the flavone substitution pattern, length and functionalization of the spacer, and disruption of the phenylpiperazine system.
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Affiliation(s)
- Laura Betti
- Dipartimento di Psichiatria, Neurobiologia, Farmacologia e Biotecnologie, Università di Pisa, Via Bonanno 6, 56126 Pisa, Italy
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6
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Betti L, Corelli F, Floridi M, Giannaccini G, Maccari L, Manetti F, Strappaghetti G, Botta M. Alpha1-adrenoceptor antagonists. 6. Structural optimization of pyridazinone-arylpiperazines. Study of the influence on affinity and selectivity of cyclic substituents at the pyridazinone ring and alkoxy groups at the arylpiperazine moiety. J Med Chem 2003; 46:3555-8. [PMID: 12877594 DOI: 10.1021/jm0307842] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In continuing our search for selective alpha(1)-adrenoceptor (AR) antagonists, we have synthesized new alkoxyarylpiperazinylalkylpyridazinone derivatives. The new compounds were tested for their affinity toward alpha(1)- and alpha(2)-AR and toward the 5-HT(1A) receptor. alpha(1)-AR affinity data are in the subnanomolar range, with 3 showing an affinity of 0.052 nM, about 5-fold higher than prazosin. None of the studied compounds was found to be alpha(1)/alpha(2) selective, but 8 showed an interesting 5-HT(1A)/alpha(1) affinity ratio of 119.
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MESH Headings
- Adrenergic alpha-Antagonists/chemical synthesis
- Adrenergic alpha-Antagonists/chemistry
- Adrenergic alpha-Antagonists/pharmacology
- Animals
- Binding Sites
- Binding, Competitive
- Cerebral Cortex/metabolism
- In Vitro Techniques
- Ligands
- Piperazines/chemical synthesis
- Piperazines/chemistry
- Piperazines/pharmacology
- Pyridazines/chemical synthesis
- Pyridazines/chemistry
- Pyridazines/pharmacology
- Rats
- Receptors, Adrenergic, alpha-1/drug effects
- Receptors, Adrenergic, alpha-1/metabolism
- Receptors, Adrenergic, alpha-2/drug effects
- Receptors, Adrenergic, alpha-2/metabolism
- Receptors, Serotonin/drug effects
- Receptors, Serotonin/metabolism
- Receptors, Serotonin, 5-HT1
- Structure-Activity Relationship
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Affiliation(s)
- Laura Betti
- Dipartimento di Psichiatria, Neurobiologia, Farmacologia e Biotecnologie, Università di Pisa, Via Bonanno 6, 56126 Pisa, Italy
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7
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Betti L, Floridi M, Giannaccini G, Manetti F, Strappaghetti G, Tafi A, Botta M. alpha1-Adrenoceptor antagonists. 5. Pyridazinone-arylpiperazines. Probing the influence on affinity and selectivity of both ortho-alkoxy groups at the arylpiperazine moiety and cyclic substituents at the pyridazinone nucleus. Bioorg Med Chem Lett 2003; 13:171-3. [PMID: 12482417 DOI: 10.1016/s0960-894x(02)00932-0] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Our previous work on pyridazinone-arylpiperazine derivatives suggested some structural features that a compound should have to show high affinity and good selectivity for alpha(1) adrenoceptors (AR) with respect to alpha(2)-AR. Accordingly, two classes of new alkoxyphenylpiperazinylheptylpyridazinones were designed and synthesized to evaluate the effect of the alkoxy substituent on affinity and selectivity. As expected, affinity increased with larger alkoxy groups. Affinity values are all comparable with that of the reference compound (prazosin), with the exception of compound 1c found 4.5-fold more active than prazosin.
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Affiliation(s)
- Laura Betti
- Dipartimento di Psichiatria, Neurobiologia, Farmacologia e Biotecnologie, Università di Pisa, Via Bonanno 6, 56126, Pisa, Italy
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8
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Betti L, Botta M, Corelli F, Floridi M, Giannaccini G, Maccari L, Manetti F, Strappaghetti G, Tafi A, Corsano S. Alpha(1)-adrenoceptor antagonists. 4. Pharmacophore-based design, synthesis, and biological evaluation of new imidazo-, benzimidazo-, and indoloarylpiperazine derivatives. J Med Chem 2002; 45:3603-11. [PMID: 12166933 DOI: 10.1021/jm011077g] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
As a part of a program aimed at discovering compounds endowed with alpha(1)-adrenoceptor (AR) blocking properties, in this paper we describe the synthesis and biological characterization of the compounds designed to fully match a three-dimensional pharmacophore model for alpha(1)-AR antagonists previously developed by our research group. Accordingly, the structure of trazodone (1), identified during a database search performed by using the model as a 3D query, was chosen as the starting point for this study and modified following suggestions derived from a literature survey. In particular, the triazolopyridine moiety of trazodone was replaced with different heteroaromatic rings (such as imidazole, benzimidazole, and indole), and a pyridazin-3(2H)-one moiety was inserted into the scaffold of the new compounds to increase the overall length of the molecules and to allow for a complete fit into all the pharmacophore features. Our aim was also to study the influence of the position of both the chloro and the methoxy groups on the piperazine phenyl ring, as well as the effect of the lengthening or shortening of the polymethylene spacer linking the phenylpiperazine moiety to the terminal heterocyclic portion. Compounds obtained by such structural optimization share a 6-(imidazol-1-yl)-, 6-(benzimidazol-1-yl)-, or 6-(indol-1-yl)pyridazin-3(2H)-one as a common structural feature that represents an element of novelty in the SAR of arylpiperazine compounds acting toward alpha(1)-AR. Biological evaluation by radioligand receptor binding assays toward alpha(1)-AR, alpha(2)-AR, and 5-HT(1A) serotoninergic receptors indicated compounds characterized by very good alpha(1)-AR affinity and selectivity. Very interestingly, chemical features (such as the o-methoxyphenylpiperazinyl moiety and an alkyl spacer of three or four methylene units) that generally do not allow for 5-HT(1A)/alpha(1) selectivity led to compounds 2c and 6c with a 5-HT(1A)/alpha(1) ratio of 286 and 281, respectively. Finally, compounds with the best alpha(1)-AR affinity profile (2c, 5f, and 6c) were demonstrated to be alpha(1)-AR antagonists.
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Affiliation(s)
- Laura Betti
- Dipartimento di Psichiatria, Neurobiologia, Farmacologia e Biotecnologie, Università di Pisa, Italy
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9
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Abstract
In the last years, alpha(1) adrenoceptors (alpha(1)-AR) have been the subject of intense research, in part because receptor-binding studies and molecular biology have opened up new aspects of understanding but also because of the potential to find new drugs possibly acting toward pathophysiological processes where alpha(1)-AR are involved, such as benign prostatic hyperplasia (BPH) or hypertension. At present, arylpiperazines represent one of the most studied classes of molecules with affinity at alpha(1)-AR. In fact, a large amount of work has been done and reported, describing synthetic procedures, biological evaluation at both alpha(1)-AR and the corresponding subtypes, and structure-activity relationships (SARs). In this paper, a review based on a literature survey aimed at focusing on the structural properties that a compound should possess to show affinity toward alpha(1)-AR is presented. Moreover, the identification and optimization of the structural features of a hit compound derived from a pharmacophore-based database search, leading to a new class of arylpiperazinylalkyl pyridazinone derivatives with alpha(1)-AR affinity is reported.
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Affiliation(s)
- F Manetti
- Dipartimento Farmaco Chimico Tecnologico, Università degli Studi di Siena, Via Aldo Moro, Italy.
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10
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Betti L, Botta M, Corelli F, Floridi M, Fossa P, Giannaccini G, Manetti F, Strappaghetti G, Corsano S. alpha(1)-Adrenoceptor antagonists. Rational design, synthesis and biological evaluation of new trazodone-like compounds. Bioorg Med Chem Lett 2002; 12:437-40. [PMID: 11814815 DOI: 10.1016/s0960-894x(01)00772-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
A rational design approach has been applied to synthesize a novel class of compounds with affinity for alpha(1) adrenergic receptors (AR). Molecular structures are characterized by a benzimidazolylpyridazinone or an imidazolylpyridazinone moiety, an original fragment in the field of the arylpiperazine compounds with alpha(1)-AR blocking properties. A 1.1 nM affinity toward alpha(1)-AR was found for compound 3, the most active of this series.
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Affiliation(s)
- Laura Betti
- Dipartimento di Psichiatria, Neurobiologia, Farmacologia e Biotecnologie, Università di Pisa, Via Bonanno 6, 56126 Pisa, Italy
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11
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Barbaro R, Betti L, Botta M, Corelli F, Giannaccini G, Maccari L, Manetti F, Strappaghetti G, Corsano S. Synthesis and biological activity of new 1,4-benzodioxan-arylpiperazine derivatives. Further validation of a pharmacophore model for alpha(1)-adrenoceptor antagonists. Bioorg Med Chem 2002; 10:361-9. [PMID: 11741785 DOI: 10.1016/s0968-0896(01)00286-3] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
A series of WB4101 (1)-related benzodioxanes (2-17) have been synthesized by replacing the phenoxyethyl moiety of 1 with a N-alkyl piperazine bearing a cyclic substituent (a substituted or unsubstituted phenyl group, a pyridine or pyridazinone ring, a furoyl moiety) at the second nitrogen atom. The binding profile of these compounds has been assessed by radioligand receptor binding assay at alpha(1)- and alpha(2)-adrenoceptors, in comparison to prazosin and rauwolscine, respectively. Moreover, structure-activity relationships have been derived for compounds 2-17 based on their fitting to a pharmacophore model for alpha(1)-adrenoceptor antagonists recently proposed by our research group. In a parallel way, the same compounds have been used to further test the predictive power and statistical significance of the model itself. The accuracy of the results obtained also in this case revealed the robustness of the calculated pharmacophore model and led to the identification of the molecular structural moieties which are thought to contribute to the biological activity.
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Affiliation(s)
- Roberta Barbaro
- Istituto di Chimica e Tecnologia del Farmaco, Università di Perugia, Via del Liceo 1, 06123, Perugia, Italy
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12
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Barbaro R, Betti L, Botta M, Corelli F, Giannaccini G, Maccari L, Manetti F, Strappaghetti G, Corsano S. Synthesis, biological evaluation, and pharmacophore generation of new pyridazinone derivatives with affinity toward alpha(1)- and alpha(2)-adrenoceptors. J Med Chem 2001; 44:2118-32. [PMID: 11405649 DOI: 10.1021/jm010821u] [Citation(s) in RCA: 97] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A series of new pyridazin-3(2H)-one derivatives (3 and 4) were evaluated for their in vitro affinity toward both alpha(1)- and alpha(2)-adrenoceptors by radioligand receptor binding assays. All target compounds showed good affinities for the alpha(1)-adrenoceptor, with K(i) values in the low nanomolar range. The polymethylene chain constituting the spacer between the furoylpiperazinyl pyridazinone and the arylpiperazine moiety was shown to influence the affinity and selectivity of these compounds. Particularly, a gradual increase in affinity was observed by lengthening the polymethylene chain up to a maximum of seven carbon atoms. In addition, compound 3k, characterized by a very interesting alpha(1)-AR affinity (1.9 nM), was also shown to be a highly selective alpha(1)-AR antagonist, the affinity ratio for alpha(2)- and alpha(1)-adrenoceptors being 274. To gain insight into the structural features required for alpha(1) antagonist activity, the pyridazinone derivatives were submitted to a pharmacophore generation procedure using the program Catalyst. The resulting pharmacophore model showed high correlation and predictive power. It also rationalized the relationships between structural properties and biological data of, and external to, the pyridazinone class.
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Affiliation(s)
- R Barbaro
- Istituto di Chimica e Tecnologia del Farmaco, Università di Perugia, Via del Liceo 1, 06123 Perugia, Italy
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13
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Strappaghetti G, Corsano S, Barbaro R, Giannaccini G, Betti L. Structure-activity relationships in a series of 8-substituted xanthines as A1-adenosine receptor antagonists. Bioorg Med Chem 2001; 9:575-83. [PMID: 11310591 DOI: 10.1016/s0968-0896(00)00271-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
A series of 8-substituted xanthines were synthesized and their affinity in vitro towards A1, A2A-adenosine receptors was evaluated by radioligand receptor binding assays. All compounds showed a greater affinity and selectivity towards the A1-adenosine receptor than theophylline. The compounds in which the n-proyl group is in 1-position of the xanthine nucleus and the pyridazinone system in 8-position is linked through a chain of two or four carbon atoms, showed the highest affinity and selectivity.
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Affiliation(s)
- G Strappaghetti
- Dipartimento di Chimica e Tecnologia del Farmaco, Università di Perugia, Italy.
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14
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Strappaghetti G, Barbaro R, Marucci G. Synthesis and alpha(1)-antagonist activity of derivatives of 4-chloro-5-[4-[2-(2-methoxyphenoxy)-ethyl]-1-piperazinyl]-3(2H)-pyrid azinone. Eur J Med Chem 2000; 35:773-9. [PMID: 10960194 DOI: 10.1016/s0223-5234(00)00161-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The synthesis and evaluation of the biological activity of new 4-chloro-5-¿4-[2-(2-methoxyphenoxy)-ethyl]-1-piperazinyl¿-3(2H)-pyrid azinone derivatives are reported. The blocking activity of these compounds was determined on the pre- and postsynaptic alpha-adrenoceptors of isolated rat vas deferens.
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Affiliation(s)
- G Strappaghetti
- Dipartimento di Chimica e Tecnologia del Farmaco, Università di Perugia, Via del Liceo 1, 06123, Perugia, Italy
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15
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Cinone N, Carrieri A, Strappaghetti G, Corsano S, Barbaro R, Carotti A. Comparative molecular field analysis of some pyridazinone-containing alpha1-antagonists. Bioorg Med Chem 1999; 7:2615-20. [PMID: 10632072 DOI: 10.1016/s0968-0896(99)00211-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Diverse series of piperazines linked at N1 to 4, 5, or 6 positions of 3-(2H)-pyridazinone ring and at N4, by a suitable alkyl spacer, to some classical alpha1-adrenoceptor pharmacophore moieties, were tested in vitro for their alpha1-adrenoceptor antagonist activity. The modeling of their biological activity (pKb) by comparative molecular field analysis led to the development of a statistically significant partial least squares (PLS) model able to detect at 3-D level the main physicochemical interactions responsible for alpha1-adrenoceptor antagonist activity.
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Affiliation(s)
- N Cinone
- Dipartimento Farmaco-Chimico, Università di Bari, Italy
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16
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Corsano S, Strappaghetti G, Barbaro R, Giannaccini G, Betti L, Lucacchini A. Synthesis of new pyridazinone derivatives and their affinity towards alpha1-alpha2-adrenoceptors. Bioorg Med Chem 1999; 7:933-41. [PMID: 10400346 DOI: 10.1016/s0968-0896(99)00046-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
A series of 3(2H)-pyridazinone derivatives was evaluated for their affinity in vitro towards alpha1-alpha2-adrenoceptors by radioligand receptor binding assays. All target compounds showed good affinities for the alpha1-adrenoceptor (with Ki values in the subnanomolar range), and a gradual increase in affinity was observed by increasing the polymethylene chain length of this series up to a maximum of six and seven carbon atoms, when the fragment 4-[2-(2-methoxyphenoxy)-ethyl]-1-piperazinyl is linked in 5 position of the 3(2H)-pyridazinone ring, while a slight decrease was found for the higher homologues. Increasing the chain length when the 4-[2-(2-methoxyphenoxy)-ethyl]-1-piperazinyl group is linked in 6 position of the 3(2H)-pyridazinone ring, had a different effect: there is the highest affinity when the polymethylene chain is of four carbon atoms. The alkylic chain, a spacer between the two major constituents of the molecule, can influence the affinity and the selectivity.
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Affiliation(s)
- S Corsano
- Istituto di Chimica e Tecnologia del Farmaco, Università di Perugia, Italy
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17
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Strappaghetti G, Corsano S, Barbaro R, Lucacchini A, Giannaccini G, Betti L. Adenosine receptors: synthesis, structure-activity relationships and biological activity of new 6-amino purine derivatives. Eur J Med Chem 1998. [DOI: 10.1016/s0223-5234(98)80050-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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18
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Corsano S, Strappaghetti G, Leonardi A, Rhazri K, Barbaro R. New 3(2H)-pyridazinone derivatives: synthesis and affinity towards α1AR subtypes and 5HT1A receptors. Eur J Med Chem 1997. [DOI: 10.1016/s0223-5234(97)89086-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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19
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Corsano S, Strappaghetti G, Scapicchi R, Marucci G. Structure-activity relationships of some 1,4-benzodioxane aryl-piperazine derivatives as alpha-blocking agents. Arch Pharm (Weinheim) 1996; 329:468-70. [PMID: 8933749 DOI: 10.1002/ardp.19963291009] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The synthesis of eight novel 1,4-benzodioxane derivatives is reported. The blocking activity of these compounds was determined on the pre- and postsynaptic alpha-adrenoceptors of isolated rat vas deferens. Structure-activity relationships are discussed.
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Affiliation(s)
- S Corsano
- Istituto di Chimica e Tecnologia del Farmaco, Università di Perugia, Italy
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Corsano S, Strappaghetti G, Scapicchi R, Lucacchini A, Senatore G. Structure-activity relationships in a series of 8-substituted xanthines as bronchodilator and A1-adenosine receptor antagonists. Arch Pharm (Weinheim) 1995; 328:654-8. [PMID: 7487422 DOI: 10.1002/ardp.19953280905] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Four new derivatives of 8-piperazine ethyl xanthine were synthesized and their bronchospasmolytic activity and A1-adenosine affinity were studied. Their relaxant action in the tracheal muscle was lower than that of theophylline and that of theophylline derivatives substituted at the 7-position. Only compound 9, where the methyl group in the 1-position of the theophylline was substituted by an isobutyl group, shows a good affinity towards the A1-adenosine receptor.
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Affiliation(s)
- S Corsano
- Istituto di Chimica Farmaceutica e Tecnica Farmaceutica, Università di Perugia, Italy
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Corsano S, Vezza R, Scapicchi R, Foresi S, Strappaghetti G, Nenci GG, Gresele P. New pyridazinone derivatives as inhibitors of platelet aggregation. Eur J Med Chem 1995. [DOI: 10.1016/0223-5234(96)88278-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Corsano S, Scapicchi R, Strappaghetti G, Marucci G, Paparelli F. Novel and highly selective postsynaptic α-adrenoreceptor antagonists: synthesis and structure-activity relationships of alkane-bridged [4-(phenoxyethyl)-1-piperazinyl]-3(2H)-pyridazinones. Eur J Med Chem 1995. [DOI: 10.1016/0223-5234(96)88211-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Abstract
Theophylline derivatives with several groups linked at the 7-position were synthesized and their pharmacological activities were studied on guinea pig. Relaxant action in the tracheal muscle was increased in comparison with that of theophylline when the 3(2H)-pyridazinone system was linked to 7-(2-ethyl)-theophylline through the piperazine ring, but decreased when the 7-(2-ethyl)-theophylline was linked to 3(2H)-pyridazinone ring through an amino group.
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Affiliation(s)
- S Corsano
- Institute of Pharmaceutical Chemistry, University of Perugia, Italy
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Corsano S, Strappaghetti G, Scapicchi R, Scalise O. Synthesis and bronchospasmolytic properties of some pyridazinone derivatives. Bioorg Med Chem Lett 1993. [DOI: 10.1016/s0960-894x(01)80748-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Corsano S, Strappaghetti G, Scapicchi R. Synthesis and antihypertensive properties of some dopamino-pyridazin-3(2H)-one derivatives. Arch Pharm (Weinheim) 1992; 325:187-91. [PMID: 1642515 DOI: 10.1002/ardp.19923250309] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- S Corsano
- Institute of Pharmaceutical Chemistry, University of Perugia, Italy
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Corsano S, Strappaghetti G, Ferrini R, Giglioli N. Synthesis and pharmacological evaluation of 6-(7-theophylline)-3(2H)-pyridazinone. Arch Pharm (Weinheim) 1991; 324:999-1001. [PMID: 1815486 DOI: 10.1002/ardp.2503241212] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Since the introduction of theophylline (1) as the first PDE-inhibitor used in the treatment of asthma, there has been intense activity in this area of therapy to design drugs with improved potency and efficacy. Derivatives of theophylline and other purine analogs were prepared and tested as PDE-inhibitors and cardiac stimulants, some of them being several times more active than theophylline. A variety of 4,5-dihydro-6-phenyl-3(2H)-pyridazinone derivatives are PDE-inhibitors like CI-914 (2) which produced a cardiotonic effect accompanied by only slight decreases in blood pressure and moderate increases in heart rate. In a recent report some 6-phenyl-3(2H)-pyridazinones showed a bronchospasmolytic effect more marked than that of xanthines. In this paper we report the synthesis and pharmacological profile of 6-(7-theophylline)-3(2H)-pyridazinone; the synthesis is shown in Scheme 1.
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Affiliation(s)
- S Corsano
- Institute of Pharmaceutical Chemistry, University of Perugia, Italy
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Corsano S, Strappaghetti G, Di Domenico E, Brasili L, Picchio MT. Synthesis and Ca-antagonist activity of some benzhydryl derivatives. Arch Pharm (Weinheim) 1989; 322:873-8. [PMID: 2619516 DOI: 10.1002/ardp.19893221207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The preparation of a series of benzhydryl derivatives is described. Their activities as Calcium-antagonists were evaluated on the taenia coli of the guinea-pig. These new compounds show lower activities as Ca-antagonists than Cinnarizine.
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Corsano S, Strappaghetti G, Codagnone A. Synthesis and antihypertensive properties of benzodioxane-pyridazinones and benzodioxane-dihydropyridazinones. Arch Pharm (Weinheim) 1989; 322:833-5. [PMID: 2624530 DOI: 10.1002/ardp.19893221113] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Corsano S, Strappaghetti G, Ferrini R, Sala R. Synthesis of compounds with a possible Ca-antagonist and beta-blocking activity. Arch Pharm (Weinheim) 1988; 321:731-4. [PMID: 2907284 DOI: 10.1002/ardp.19883211007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Corsano S, Strappaghetti G, Brasili L. Synthesis and pharmacological evaluation of some analogues of the Ca-antagonist cinnarizine. Arch Pharm (Weinheim) 1988; 321:171-4. [PMID: 3389984 DOI: 10.1002/ardp.19883210313] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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Strappaghetti G, Brasili L. Synthesis and pharmacological evaluation of cyclic and opened thioanalogues of piperoxan. Farmaco Sci 1986; 41:794-800. [PMID: 2878824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Three piperoxan analogues, derived from the opening of the benzodioxane ring and/or replacement of the oxygen atom with the less polar sulfur, were synthesized. The decrease of the alpha-blocking activity found for these compounds showed that the binding site of benzodioxane-like compounds does not accept the substitution with less polar groups.
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Melchiorre C, Brasili L, Giardinà D, Pigini M, Strappaghetti G. 2-[[[2-(2,6-Dimethoxyphenoxy)ethyl]amino]-methyl] -1,4-benzoxathian: a new antagonist with high potency and selectivity toward alpha 1-adrenoreceptors. J Med Chem 1984; 27:1535-6. [PMID: 6150111 DOI: 10.1021/jm00378a001] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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Castagnino E, Strappaghetti G, Corsano S, Gallucci P, Brasili L, Giardinà D. Synthesis and pharmacological evaluation of some WB4101 analogues bearing a naphthodioxanic nucleus. Farmaco Sci 1984; 39:569-574. [PMID: 6148262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Three WB4101 analogues, bearing a 1,4-naphthodioxanic system, were synthesized. The decrease of the alpha-blocking activity found for these compounds, showed that extension of the aromatic area in the dioxanic moiety of such benzodioxanic derivative, hinders the drug-receptor interaction.
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Castagnino E, Corsano S, Strappaghetti G, Brasili L, Gallucci P. Synthesis and pharmacological evaluation of propranolol-cyclic analogues. Farmaco Sci 1983; 38:679-85. [PMID: 6139297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Three propranolol analogues, bearing the oxygen of the --OH group enclosed in a 1,4-dioxanic rigid system, were synthetized. The lack of beta-blocking activity found for these compounds demonstrates the important role played by a free--OH group in the drug-receptor interaction.
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Abstract
From the essential oil of Commiphora guidotti seven sesquiterpene hydrocarbons and a furanosesquiterpenoid, furanodiene, were isolated.
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Affiliation(s)
- A Craveiro
- Istituto di Chimica Farmaceutica e Tecnica Farmaceutica, Università di Perugia, Perugia, Italy
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Castagnino E, Corsano S, Proietti G, Strappaghetti G. Evaluation of activity on capillary permeability of synthetic flavonoids. Farmaco Sci 1983; 38:67-72. [PMID: 6825833 DOI: 10.1002/chin.198321223] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Corazzi L, Arienti G, Porcellati G, Proietti G, Corsano S, Strappaghetti G. The effect of some flavolignans on lipid synthesis in ethanol-intoxicated hepatocytes in primary culture. Farmaco Sci 1981; 36:838-44. [PMID: 7308455] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Rat liver cells in primary culture have been used to investigate the effect of ethanol and of two flavolignans 3,7-dihydroxy-2-(1,4-benzodioxan-6-yl)chroman-4-one (I) and 3,7-dihydroxy-2-[(2,3-diphenyl)-1,4-benzodioxan-6-yl]chroman-4-one (II) on the incorporation of [2-3H]-glycerol into lipids. Ethanol produces a decrease of the incorporation of labelled glycerol into lipids, whereas at the longest times of incubation flavolignans have an opposite effect. Neutral lipid/phospholipid labelling ratio is modified by ethanol in favour of neutral lipids. This action is counteracted by both flavolignans, which are therefore able to hinder, at least partially, the actions of ethyl alcohol on liver lipid metabolism.
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Mezzetti T, Mezzetti C, Strappaghetti G, Proietti G. [Determination of hippuric and 4-aminohippuric acids in urine]. Boll Chim Farm 1981; 120:407-15. [PMID: 7317167] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Brunelli C, Fravolini A, Grandolini G, Strappaghetti G. New heterocyclic ring systems. XII. Synthesis of [1,4]thiazinocarbazoles. J Heterocycl Chem 1980. [DOI: 10.1002/jhet.5570170140] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Fravolini A, Schiaffella F, Strappaghetti G, Volpato I, de Regis M. [Synthesis and pharmacologic activity of benzothiopyranopyrazole and benzothiopyranoisoxazole carboxamides]. Farmaco Sci 1978; 33:855-65. [PMID: 311299] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A series of carboxamides of benzotiopyranopyrazoles and benzothiiopyranoisoxazoles was synthesized starting from benzothiopyran-4-one-3-methylglyoxylates through two synthetic methods and tested for anti-inflammatory, analgesic and cardiovascular activity. Some of these compounds display pronounced antiarrhythmic activity.
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Fravolini A, Martani A, Grandolini G, Strappaghetti G. New helerocyclic ring systems from α-llydroxymethylenekelones. VIII. Polyuzasteroidal analogues of equilenin. J Heterocycl Chem 1977. [DOI: 10.1002/jhet.5570140108] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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