1
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Kaur M, Garg S, Malhi DS, Sohal HS. A Review on Synthesis, Reactions and Biological Properties of Seven Membered Heterocyclic Compounds: Azepine, Azepane, Azepinone. CURR ORG CHEM 2021. [DOI: 10.2174/1385272825999210104222338] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Seven membered heterocyclic Azepine and its derivatives have great pharmacological
and therapeutic implications. In this review, the literature of the last fifty years has
been exploited for the synthesis, reaction, and biological properties of these seven-member
heterocyclic compounds. Most of the mechanisms involved the ring expansion of either five
or six-membered compounds using various methods such as thermally, photo-chemically, and
microwave irradiation. The systematically designed schemes involve the synthesis of different
derivatives of azepine, azepinone, azepane, etc., using similar moieties by various researchers.
However, there is much work yet to be done in the biological section, as it is not
explored and reported in the literature; therefore, N-containing seven-membered heterocycles
still have much scope for the researchers.
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Affiliation(s)
- Manvinder Kaur
- Department of Chemistry, Chandigarh University, Gharuan-140413, Mohali, Punjab, India
| | - Sonali Garg
- Department of Chemistry, Chandigarh University, Gharuan-140413, Mohali, Punjab, India
| | - Dharambeer S. Malhi
- Department of Chemistry, Chandigarh University, Gharuan-140413, Mohali, Punjab, India
| | - Harvinder S. Sohal
- Department of Chemistry, Chandigarh University, Gharuan-140413, Mohali, Punjab, India
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2
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Flores-Reyes JC, Islas-Jácome A, González-Zamora E. The Ugi three-component reaction and its variants. Org Chem Front 2021. [DOI: 10.1039/d1qo00313e] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A broad variety of α-aminoamide-based compounds have been synthesized via the three-component version of the Ugi reaction (U-3CR) or by any of its variants (Ugi-Zhu-3CR, Orru-3CR, Ugi-4C-3CR, Ugi-Joullié-3CR, GBB-3CR, Ugi-Reissert-3CR, and so on).
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Affiliation(s)
- Julio César Flores-Reyes
- Departamento de Química, Universidad Autónoma Metropolitana-Iztapalapa, San Rafael Atlixco 186, Col. Vicentina, Iztapalapa, C.P. 09340, Ciudad de Mexico
| | - Alejandro Islas-Jácome
- Departamento de Química, Universidad Autónoma Metropolitana-Iztapalapa, San Rafael Atlixco 186, Col. Vicentina, Iztapalapa, C.P. 09340, Ciudad de Mexico
| | - Eduardo González-Zamora
- Departamento de Química, Universidad Autónoma Metropolitana-Iztapalapa, San Rafael Atlixco 186, Col. Vicentina, Iztapalapa, C.P. 09340, Ciudad de Mexico
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3
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Nazeri MT, Farhid H, Mohammadian R, Shaabani A. Cyclic Imines in Ugi and Ugi-Type Reactions. ACS COMBINATORIAL SCIENCE 2020; 22:361-400. [PMID: 32574488 DOI: 10.1021/acscombsci.0c00046] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Ugi four-component reactions (U-4CRs) are widely recognized as being highly efficient for the synthesis of pseudopeptides. However, the products of these reactions are not so interesting as drug candidates because they are not conformationally restricted enough for a potent interaction with biological targets. One possible way to overcome this problem is to replace amine and oxo components in the U-4CRs with cyclic imines in so-called Joullié-Ugi three-component reactions (JU-3CRs). This approach provides a robust single-step route to peptide moieties connected to N-heterocyclic motifs that are found as core skeletons in many natural products and pharmaceutical compounds. JU-3CRs also provide much better diastereoselectivity than their four-component analogues. We survey here the redesign of many synthetic routes for the efficient preparation of a wide variety of three-, five-, six-, and seven-membered heterocyclic compounds connected to the peptide backbone. Additionally, in the Ugi reactions based on the cyclic imines, α-acidic isocyanides, or azides can be replaced with normal isocyanides or acids, respectively, leading to the synthesis of N-heterocycles attached to oxazoles or tetrazoles, which are of great pharmaceutical significance. This Review includes all research articles related to Ugi reactions based on the cyclic imines to the year 2020 and will be useful to chemists in designing novel synthetic routes for the synthesis of individual and combinatorial libraries of natural products and drug-like compounds.
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Affiliation(s)
- Mohammad Taghi Nazeri
- Faculty of Chemistry, Shahid Beheshti University, G. C., P.O. Box 19396-4716, 1983963113 Tehran, Iran
| | - Hassan Farhid
- Faculty of Chemistry, Shahid Beheshti University, G. C., P.O. Box 19396-4716, 1983963113 Tehran, Iran
| | - Reza Mohammadian
- Faculty of Chemistry, Shahid Beheshti University, G. C., P.O. Box 19396-4716, 1983963113 Tehran, Iran
| | - Ahmad Shaabani
- Faculty of Chemistry, Shahid Beheshti University, G. C., P.O. Box 19396-4716, 1983963113 Tehran, Iran
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4
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Tripathi S, Ambule MD, Srivastava AK. Construction of Highly Functionalized Piperazinones via Post-Ugi Cyclization and Diastereoselective Nucleophilic Addition. J Org Chem 2020; 85:6910-6923. [PMID: 32352769 DOI: 10.1021/acs.joc.0c00108] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
A novel method for the generation of uniquely functionalized piperazinones by utilizing post-Ugi functionalization is described. The method involves an Ugi reaction with aminoacetaldehyde dimethyl acetal, followed by acid-mediated cyclization to generate the iminium precursor that was subjected to nucleophilic addition in a diastereoselective manner. The method was also employed to synthesize trans-dragmacidine C and praziquantel-like molecules.
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Affiliation(s)
- Shashank Tripathi
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute, Sector-10, Jankipuram Extension, Lucknow 226031, India.,Chemical Sciences Division, Academy of Scientific and Innovative Research (AcSIR), New Delhi 110025, India
| | - Mayur D Ambule
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute, Sector-10, Jankipuram Extension, Lucknow 226031, India.,Chemical Sciences Division, Academy of Scientific and Innovative Research (AcSIR), New Delhi 110025, India
| | - Ajay Kumar Srivastava
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute, Sector-10, Jankipuram Extension, Lucknow 226031, India.,Chemical Sciences Division, Academy of Scientific and Innovative Research (AcSIR), New Delhi 110025, India
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5
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Lambruschini C, Moni L, Banfi L. Diastereoselectivity in Passerini Reactions of Chiral Aldehydes and in Ugi Reactions of Chiral Cyclic Imines. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000016] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Chiara Lambruschini
- Department of Chemistry and Industrial Chemistry; University of Genova; via Dodecaneso 31 Genova Italy
| | - Lisa Moni
- Department of Chemistry and Industrial Chemistry; University of Genova; via Dodecaneso 31 Genova Italy
| | - Luca Banfi
- Department of Chemistry and Industrial Chemistry; University of Genova; via Dodecaneso 31 Genova Italy
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6
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Pinna A, Basso A, Lambruschini C, Moni L, Riva R, Rocca V, Banfi L. Stereodivergent access to all four stereoisomers of chiral tetrahydrobenzo[f][1,4]oxazepines, through highly diastereoselective multicomponent Ugi–Joullié reaction. RSC Adv 2020; 10:965-972. [PMID: 35494435 PMCID: PMC9047508 DOI: 10.1039/c9ra10689h] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Accepted: 12/20/2019] [Indexed: 12/25/2022] Open
Abstract
Starting from easily accessible chiral enantiopure 1,2-amino alcohols and salicylaldehydes, a concise route to cyclic imines has been developed. These chiral cyclic imines undergo a highly diastereoselective Ugi–Joullié reaction to give trans tetrahydrobenzo[f][1,4]oxazepines with the introduction of up to 4 diversity inputs. The cis isomer may also be attained, thanks to a thermodynamically controlled base catalysed epimerization. Free secondary amines have been obtained using an unprecedented “removable” carboxylic acid. Starting from easily accessible enantiopure 1,2-aminoalcohols and salicylaldehydes, a concise and diastereodivergent route to tetrahydrobenzo[f][1,4]oxazepines has been developed.![]()
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Affiliation(s)
- Alessandro Pinna
- Department of Chemistry and Industrial Chemistry
- Università di Genova
- Italy
| | - Andrea Basso
- Department of Chemistry and Industrial Chemistry
- Università di Genova
- Italy
| | | | - Lisa Moni
- Department of Chemistry and Industrial Chemistry
- Università di Genova
- Italy
| | - Renata Riva
- Department of Pharmacy
- Università di Genova
- Italy
| | - Valeria Rocca
- Department of Chemistry and Industrial Chemistry
- Università di Genova
- Italy
| | - Luca Banfi
- Department of Chemistry and Industrial Chemistry
- Università di Genova
- Italy
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7
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Gazzotti S, Rainoldi G, Silvani A. Exploitation of the Ugi–Joullié reaction in drug discovery and development. Expert Opin Drug Discov 2019; 14:639-652. [DOI: 10.1080/17460441.2019.1604676] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Stefano Gazzotti
- Dipartimento di Chimica, Università degli Studi di Milano, Milano, Italy
| | - Giulia Rainoldi
- Dipartimento di Chimica, Università degli Studi di Milano, Milano, Italy
| | - Alessandra Silvani
- Dipartimento di Chimica, Università degli Studi di Milano, Milano, Italy
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8
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Caputo S, Banfi L, Basso A, Galatini A, Moni L, Riva R, Lambruschini C. Diversity-Oriented Synthesis of Various Enantiopure Heterocycles by Coupling Organocatalysis with Multicomponent Reactions. European J Org Chem 2017. [DOI: 10.1002/ejoc.201701328] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Samantha Caputo
- Department of Chemistry and Industrial Chemistry; University of Genova; via Dodecaneso 31 16146 Genova Italy
| | - Luca Banfi
- Department of Chemistry and Industrial Chemistry; University of Genova; via Dodecaneso 31 16146 Genova Italy
| | - Andrea Basso
- Department of Chemistry and Industrial Chemistry; University of Genova; via Dodecaneso 31 16146 Genova Italy
| | - Andrea Galatini
- Department of Chemistry and Industrial Chemistry; University of Genova; via Dodecaneso 31 16146 Genova Italy
| | - Lisa Moni
- Department of Chemistry and Industrial Chemistry; University of Genova; via Dodecaneso 31 16146 Genova Italy
| | - Renata Riva
- Department of Chemistry and Industrial Chemistry; University of Genova; via Dodecaneso 31 16146 Genova Italy
| | - Chiara Lambruschini
- Department of Chemistry and Industrial Chemistry; University of Genova; via Dodecaneso 31 16146 Genova Italy
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9
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Vanicat A, André-Barrès C, Delfourne E. New reaction of formation of the fused tricyclic bispyrroloquinone ring system. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2016.12.030] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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10
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Shahi CK, Bhattacharyya A, Nanaji Y, Ghorai MK. A Stereoselective Route to Tetrahydrobenzoxazepines and Tetrahydrobenzodiazepines via Ring-Opening and Aza-Michael Addition of Activated Aziridines with 2-Hydroxyphenyl and 2-Aminophenyl Acrylates. J Org Chem 2016; 82:37-47. [DOI: 10.1021/acs.joc.6b01919] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Chandan Kumar Shahi
- Department
of Chemistry, Indian Institute of Technology, Kanpur 208016, India
| | | | - Yerramsetti Nanaji
- Department
of Chemistry, Indian Institute of Technology, Kanpur 208016, India
| | - Manas K. Ghorai
- Department
of Chemistry, Indian Institute of Technology, Kanpur 208016, India
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11
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Bode ML, Gravestock D, Rousseau AL. Synthesis, Reactions and Uses of Isocyanides in Organic Synthesis. An Update. ORG PREP PROCED INT 2016. [DOI: 10.1080/00304948.2016.1138072] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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12
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Caputo S, Basso A, Moni L, Riva R, Rocca V, Banfi L. Diastereoselective Ugi reaction of chiral 1,3-aminoalcohols derived from an organocatalytic Mannich reaction. Beilstein J Org Chem 2016; 12:139-43. [PMID: 26877816 PMCID: PMC4734417 DOI: 10.3762/bjoc.12.15] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2015] [Accepted: 01/14/2016] [Indexed: 12/11/2022] Open
Abstract
Enantiomerically pure β-aminoalcohols, produced through an organocatalytic Mannich reaction, were subjected to an Ugi multicomponent reaction under classical or Lewis acid-promoted conditions with diastereoselectivities ranging from moderate to good. This approach represents a step-economical path to enantiomerically pure, polyfunctionalized peptidomimetics endowed with three stereogenic centers, allowing the introduction of five diversity inputs.
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Affiliation(s)
- Samantha Caputo
- Department of Chemistry and Industrial Chemistry, University of Genova, I-16146 Genova, Italy
| | - Andrea Basso
- Department of Chemistry and Industrial Chemistry, University of Genova, I-16146 Genova, Italy
| | - Lisa Moni
- Department of Chemistry and Industrial Chemistry, University of Genova, I-16146 Genova, Italy
| | - Renata Riva
- Department of Chemistry and Industrial Chemistry, University of Genova, I-16146 Genova, Italy
| | - Valeria Rocca
- Department of Chemistry and Industrial Chemistry, University of Genova, I-16146 Genova, Italy
| | - Luca Banfi
- Department of Chemistry and Industrial Chemistry, University of Genova, I-16146 Genova, Italy
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13
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March S, Pelletier SMC, Plant A. Expedient synthesis of substituted 4-hydroxy-quinolin-2(1H)-ones. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.08.085] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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14
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Moni L, Banfi L, Basso A, Carcone L, Rasparini M, Riva R. Ugi and Passerini Reactions of Biocatalytically Derived Chiral Aldehydes: Application to the Synthesis of Bicyclic Pyrrolidines and of Antiviral Agent Telaprevir. J Org Chem 2015; 80:3411-28. [DOI: 10.1021/jo502829j] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Lisa Moni
- Department
of Chemistry and Industrial Chemistry, University of Genova, via Dodecaneso
31, 16146 Genova, Italy
| | - Luca Banfi
- Department
of Chemistry and Industrial Chemistry, University of Genova, via Dodecaneso
31, 16146 Genova, Italy
| | - Andrea Basso
- Department
of Chemistry and Industrial Chemistry, University of Genova, via Dodecaneso
31, 16146 Genova, Italy
| | - Luca Carcone
- Chemessentia Srl, via
Bovio 6, 28100 Novara, Italy
| | | | - Renata Riva
- Department
of Chemistry and Industrial Chemistry, University of Genova, via Dodecaneso
31, 16146 Genova, Italy
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15
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Belding L, Zaretsky S, Rotstein BH, Yudin AK, Dudding T. Shifting the energy landscape of multicomponent reactions using aziridine aldehyde dimers: a mechanistic study. J Org Chem 2014; 79:9465-71. [PMID: 25264960 DOI: 10.1021/jo501242r] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
A multicomponent reaction between an aziridine aldehyde dimer, isocyanide, and l-proline to afford a chiral piperazinone was studied to gain insight into the stereodetermining and rate-limiting steps of the reaction. The stereochemistry of the reaction was found to be determined by isocyanide addition, while the rate-limiting step was found to deviate from traditional isocyanide-based multicomponent reactions. A first-order rate dependence on aziridine aldehyde dimer and a zero-order rate dependence on all other reagents have been obtained. Computations at the MPWPW91/6-31G(d) level supported the experimental kinetic results and provide insight into the overall mechanism and the factors contributing to stereochemical induction. These factors are similar to traditional isocyanide-based multicomponent reactions, such as the Ugi reaction. The computations revealed that selective formation of a Z-iminium ion plays a key role in controlling the stereoselectivity of isocyanide addition, and the carboxylate group of l-proline mediates stereofacial addition. These conclusions are expected to be applicable to a wide range of reported stereoselective Ugi reactions and provide a basis for understanding the related macrocyclization of peptides with aziridine aldehydes.
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Affiliation(s)
- Lee Belding
- Brock University , St. Catharines, Ontario L2S 3A1, Canada
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16
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Janssen GV, Vicente-García E, Vogel W, Slootweg JC, Ruijter E, Lammertsma K, Orru RVA. Stereoselective Synthesis of β-Sulfinylamino Isocyanides and 2-Imidazolines. European J Org Chem 2014. [DOI: 10.1002/ejoc.201402210] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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17
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Moni L, Banfi L, Basso A, Brambilla A, Riva R. Diversity-oriented synthesis of dihydrobenzoxazepinones by coupling the Ugi multicomponent reaction with a Mitsunobu cyclization. Beilstein J Org Chem 2014; 10:209-12. [PMID: 24605140 PMCID: PMC3943941 DOI: 10.3762/bjoc.10.16] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2013] [Accepted: 12/16/2013] [Indexed: 11/25/2022] Open
Abstract
An operationally simple protocol for the synthesis of 2,3-dihydrobenzo[f][1,4]oxazepin-3-ones, based on an Ugi reaction of an ortho-(benzyloxy)benzylamine, glycolic acid, an isocyanide and an aldehyde, followed by an intramolecular Mitsunobu substitution was developed. The required ortho-(benzyloxy)benzylamines have been in situ generated from the corresponding azides, in turn prepared in high yields from salicylic derivatives.
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Affiliation(s)
- Lisa Moni
- Department of Chemistry and Industrial Chemistry, University of Genova, I-16146 Genova, Italy
| | - Luca Banfi
- Department of Chemistry and Industrial Chemistry, University of Genova, I-16146 Genova, Italy
| | - Andrea Basso
- Department of Chemistry and Industrial Chemistry, University of Genova, I-16146 Genova, Italy
| | - Alice Brambilla
- Department of Chemistry and Industrial Chemistry, University of Genova, I-16146 Genova, Italy
| | - Renata Riva
- Department of Chemistry and Industrial Chemistry, University of Genova, I-16146 Genova, Italy
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18
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Banfi L, Basso A, Moni L, Riva R. The Alternative Route to Enantiopure Multicomponent Reaction Products: Biocatalytic or Organocatalytic Enantioselective Production of Inputs for Multicomponent Reactions. European J Org Chem 2014. [DOI: 10.1002/ejoc.201301715] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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19
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Moni L, Banfi L, Basso A, Galatini A, Spallarossa M, Riva R. Enantio- and Diastereoselective Synthesis of Highly Substituted Benzazepines by a Multicomponent Strategy Coupled with Organocatalytic and Enzymatic Procedures. J Org Chem 2013; 79:339-51. [DOI: 10.1021/jo402527w] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Lisa Moni
- Department
of Chemistry and
Industrial Chemistry, University of Genova, Via Dodecaneso, 31, 16146 Genova, Italy
| | - Luca Banfi
- Department
of Chemistry and
Industrial Chemistry, University of Genova, Via Dodecaneso, 31, 16146 Genova, Italy
| | - Andrea Basso
- Department
of Chemistry and
Industrial Chemistry, University of Genova, Via Dodecaneso, 31, 16146 Genova, Italy
| | - Andrea Galatini
- Department
of Chemistry and
Industrial Chemistry, University of Genova, Via Dodecaneso, 31, 16146 Genova, Italy
| | - Martina Spallarossa
- Department
of Chemistry and
Industrial Chemistry, University of Genova, Via Dodecaneso, 31, 16146 Genova, Italy
| | - Renata Riva
- Department
of Chemistry and
Industrial Chemistry, University of Genova, Via Dodecaneso, 31, 16146 Genova, Italy
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20
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Jida M, Betti C, Urbanczyk-Lipkowska Z, Tourwé D, Ballet S. Highly Diastereoselective Synthesis of 1-Carbamoyl-4-aminoindoloazepinone Derivatives via the Ugi Reaction. Org Lett 2013; 15:5866-9. [DOI: 10.1021/ol402940x] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Mouhamad Jida
- Department of Organic Chemistry, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium, and Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka Str. 44/52, 01-224 Warsaw, Poland
| | - Cecilia Betti
- Department of Organic Chemistry, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium, and Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka Str. 44/52, 01-224 Warsaw, Poland
| | - Zofia Urbanczyk-Lipkowska
- Department of Organic Chemistry, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium, and Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka Str. 44/52, 01-224 Warsaw, Poland
| | - Dirk Tourwé
- Department of Organic Chemistry, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium, and Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka Str. 44/52, 01-224 Warsaw, Poland
| | - Steven Ballet
- Department of Organic Chemistry, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium, and Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka Str. 44/52, 01-224 Warsaw, Poland
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