51
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Zhou Y, Wei YL, Rodriguez J, Coquerel Y. Enantioselective Organocatalytic Four-Atom Ring Expansion of Cyclobutanones: Synthesis of Benzazocinones. Angew Chem Int Ed Engl 2018; 58:456-460. [PMID: 30398303 DOI: 10.1002/anie.201810184] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Revised: 10/15/2018] [Indexed: 01/04/2023]
Abstract
An enantioselective Michael addition- four-atom ring expansion cascade reaction involving cyclobutanones activated by a N-aryl secondary amide group and ortho-amino nitrostyrenes has been developed for the preparation of functionalized eight-membered benzolactams using bifunctional aminocatalysts. Taking advantage of the secondary amide activating group, the eight-membered cyclic products could be further rearranged into their six-membered isomers having a glutarimide core under base catalysis conditions without erosion of optical purity, featuring an overall ring expansion- ring contraction strategy.
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Affiliation(s)
- Yirong Zhou
- Aix Marseille Université, CNRS, Centrale Marseille, ISM2, 13397, Marseille, France.,Key Laboratory of Functional Small Organic Molecules Ministry of Education, Jiangxi Normal University, 330022, Nanchang, China
| | - Yun-Long Wei
- Aix Marseille Université, CNRS, Centrale Marseille, ISM2, 13397, Marseille, France
| | - Jean Rodriguez
- Aix Marseille Université, CNRS, Centrale Marseille, ISM2, 13397, Marseille, France
| | - Yoann Coquerel
- Aix Marseille Université, CNRS, Centrale Marseille, ISM2, 13397, Marseille, France
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52
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Synthesis of 9-nitro-5H-spiro[benzo[b]tetrazolo[1,5-d][1,4]oxazepine-4,2′-oxirane] via an unusual ring-expansion. Tetrahedron Lett 2018. [DOI: 10.1016/j.tetlet.2018.10.016] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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53
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Mas-Roselló J, Okoh M, Clayden J. Enantioselectively functionalised phenytoin derivatives by auxiliary-directed N to C aryl migration in lithiated α-amino nitriles. Chem Commun (Camb) 2018; 54:10985-10988. [PMID: 30211399 DOI: 10.1039/c8cc06833j] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Lithiation of N'-arylureas derived from amino nitriles incorporating a (1R,2R)-2-aminocyclohexanol chiral auxiliary leads to diastereoselective migration of the aryl ring to the position α to the nitrile. The resulting N'-lithiated ureas undergo spontaneous cyclisation to iminohydantoins, which may be hydrolysed to give chiral 5,5-diarylhydantoins related to phenytoin, in enantioenriched form.
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Affiliation(s)
- Josep Mas-Roselló
- School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, UK.
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54
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Osipyan A, Sapegin A, Novikov AS, Krasavin M. Rare Medium-Sized Rings Prepared via Hydrolytic Imidazoline Ring Expansion (HIRE). J Org Chem 2018; 83:9707-9717. [PMID: 30101583 DOI: 10.1021/acs.joc.8b01210] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The hydrolytic imidazoline ring expansion (HIRE) methodology was extended to readily available tetracyclic [1,4]thiazepines as well as sulfoxide and sulfone analogs thereof. The reactions resulted in the facile formation of a rare medium-sized [1,4,7]thiazecine ring system that has an emerging utility in bioactive compound design. Comparing the HIRE rates for representative compounds in the three groups of substrates allowed drawing some generalizations about the substituent effects on the course of the reaction.
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Affiliation(s)
- Angelina Osipyan
- Saint Petersburg State University , Saint Petersburg 199034 , Russian Federation
| | - Alexander Sapegin
- Saint Petersburg State University , Saint Petersburg 199034 , Russian Federation
| | - Alexander S Novikov
- Saint Petersburg State University , Saint Petersburg 199034 , Russian Federation
| | - Mikhail Krasavin
- Saint Petersburg State University , Saint Petersburg 199034 , Russian Federation
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55
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Risso V, Farran D, Javierre G, Naubron JV, Giorgi M, Piras P, Jean M, Vanthuyne N, Fruttero R, Lorcy D, Roussel C. Atropisomerism in a 10-Membered Ring with Multiple Chirality Axes: (3 Z,9 Z)-1,2,5,8-Dithiadiazecine-6,7(5 H,8 H)-dione Series. J Org Chem 2018; 83:7566-7573. [PMID: 29884018 DOI: 10.1021/acs.joc.8b01009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
For the first time, chirality in (3 Z,9 Z)-1,2,5,8-dithiadiazecine-6,7(5 H,8 H)-dione series was recognized. Enantiomers of the 4,9-dimethyl-5,8-diphenyl analogue were isolated at room temperature, and their thermal stability was determined. X-ray crystallography confirmed the occurrence of a pair of enantiomers in the crystal. Absolute configurations were assigned by comparing experimental and calculated vibrational/electronic circular dichroism spectra of isolated enantiomers. A distorted tesseract (four-dimensional hypercube) was used to visualize the calculated enantiomerization process, which requires the rotation around four chirality axes. Conformers of higher energy as well as several concurrent pathways of similar energies were revealed.
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Affiliation(s)
- Vesna Risso
- Aix-Marseille Univ., CNRS, Centrale Marseille , iSm2, Marseille , France
| | - Daniel Farran
- Aix-Marseille Univ., CNRS, Centrale Marseille , iSm2, Marseille , France
| | - Guilhem Javierre
- Aix-Marseille Univ., CNRS, Centrale Marseille , iSm2, Marseille , France
| | - Jean-Valère Naubron
- Spectropole , Aix-Marseille Université , CNRS FR 1739, Marseille 13397 Cedex 20 , France
| | - Michel Giorgi
- Spectropole , Aix-Marseille Université , CNRS FR 1739, Marseille 13397 Cedex 20 , France
| | - Patrick Piras
- Aix-Marseille Univ., CNRS, Centrale Marseille , iSm2, Marseille , France
| | - Marion Jean
- Aix-Marseille Univ., CNRS, Centrale Marseille , iSm2, Marseille , France
| | - Nicolas Vanthuyne
- Aix-Marseille Univ., CNRS, Centrale Marseille , iSm2, Marseille , France
| | - Roberta Fruttero
- Department of Drug Sciences and Technology , University of Torino , 8-10124 Torino , Italy
| | | | - Christian Roussel
- Aix-Marseille Univ., CNRS, Centrale Marseille , iSm2, Marseille , France
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56
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Slough DP, McHugh SM, Lin YS. Understanding and designing head-to-tail cyclic peptides. Biopolymers 2018; 109:e23113. [PMID: 29528114 PMCID: PMC6135719 DOI: 10.1002/bip.23113] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2017] [Revised: 02/23/2018] [Accepted: 02/26/2018] [Indexed: 01/30/2023]
Abstract
Cyclic peptides (CPs) are an exciting class of molecules with a variety of applications. However, design strategies for CP therapeutics, for example, are generally limited by a poor understanding of their sequence-structure relationships. This knowledge gap often leads to a trial-and-error approach for designing CPs for a specific purpose, which is both costly and time-consuming. Herein, we describe the current experimental and computational efforts in understanding and designing head-to-tail CPs along with their respective challenges. In addition, we provide several future directions in the field of computational CP design to improve its accuracy, efficiency and applicability. These advances, combined with experimental techniques, shall ultimately provide a better understanding of these interesting molecules and a reliable working platform to rationally design CPs with desired characteristics.
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Affiliation(s)
| | | | - Yu-Shan Lin
- Department of Chemistry, Tufts University, Medford, Massachusetts, 02155, United States
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57
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Wang YN, Yang LC, Rong ZQ, Liu TL, Liu R, Zhao Y. Pd-Catalyzed Enantioselective [6+4] Cycloaddition of Vinyl Oxetanes with Azadienes to Access Ten-Membered Heterocycles. Angew Chem Int Ed Engl 2018; 57:1596-1600. [DOI: 10.1002/anie.201711648] [Citation(s) in RCA: 119] [Impact Index Per Article: 19.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2017] [Revised: 12/16/2017] [Indexed: 11/06/2022]
Affiliation(s)
- Ya-Nong Wang
- Department of Chemistry; National University of Singapore; 3 Science Drive 3 Singapore 117543 Singapore
| | - Li-Cheng Yang
- Department of Chemistry; National University of Singapore; 3 Science Drive 3 Singapore 117543 Singapore
| | - Zi-Qiang Rong
- Department of Chemistry; National University of Singapore; 3 Science Drive 3 Singapore 117543 Singapore
| | - Tang-Lin Liu
- Department of Chemistry; National University of Singapore; 3 Science Drive 3 Singapore 117543 Singapore
| | - Ruoyang Liu
- Department of Chemistry; National University of Singapore; 3 Science Drive 3 Singapore 117543 Singapore
| | - Yu Zhao
- Department of Chemistry; National University of Singapore; 3 Science Drive 3 Singapore 117543 Singapore
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58
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Wang YN, Yang LC, Rong ZQ, Liu TL, Liu R, Zhao Y. Pd-Catalyzed Enantioselective [6+4] Cycloaddition of Vinyl Oxetanes with Azadienes to Access Ten-Membered Heterocycles. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201711648] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Ya-Nong Wang
- Department of Chemistry; National University of Singapore; 3 Science Drive 3 Singapore 117543 Singapore
| | - Li-Cheng Yang
- Department of Chemistry; National University of Singapore; 3 Science Drive 3 Singapore 117543 Singapore
| | - Zi-Qiang Rong
- Department of Chemistry; National University of Singapore; 3 Science Drive 3 Singapore 117543 Singapore
| | - Tang-Lin Liu
- Department of Chemistry; National University of Singapore; 3 Science Drive 3 Singapore 117543 Singapore
| | - Ruoyang Liu
- Department of Chemistry; National University of Singapore; 3 Science Drive 3 Singapore 117543 Singapore
| | - Yu Zhao
- Department of Chemistry; National University of Singapore; 3 Science Drive 3 Singapore 117543 Singapore
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59
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Peters BK, Razuwika R, Samipillai M, Arvidsson PI, Kruger HG, Govender T, Naicker T. An unexpected re-arrangement of the antibiotic carbapenem core to new 1,4-diazepin-5-one scaffolds. RSC Adv 2018. [DOI: 10.1039/c7ra12688c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Herein we report a peculiar organocatalyzed domino-reaction on the carbapenem core structure.
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Affiliation(s)
- Byron K. Peters
- Catalysis and Peptide Research Unit
- University of KwaZulu Natal
- Durban
- South Africa
| | - Rufaro Razuwika
- Catalysis and Peptide Research Unit
- University of KwaZulu Natal
- Durban
- South Africa
| | - Marivel Samipillai
- Catalysis and Peptide Research Unit
- University of KwaZulu Natal
- Durban
- South Africa
| | - Per I. Arvidsson
- Catalysis and Peptide Research Unit
- University of KwaZulu Natal
- Durban
- South Africa
- Science for Life Laboratory
| | - Hendrik G. Kruger
- Catalysis and Peptide Research Unit
- University of KwaZulu Natal
- Durban
- South Africa
| | - Thavendran Govender
- Catalysis and Peptide Research Unit
- University of KwaZulu Natal
- Durban
- South Africa
| | - Tricia Naicker
- Catalysis and Peptide Research Unit
- University of KwaZulu Natal
- Durban
- South Africa
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60
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Wang S, An XD, Li SS, Liu X, Liu Q, Xiao J. Hydride transfer initiated ring expansion of pyrrolidines toward highly functionalized tetrahydro-1-benzazepines. Chem Commun (Camb) 2018; 54:13833-13836. [DOI: 10.1039/c8cc08238c] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first example of ring expansion from a five-membered nitrogen-containing ring to a seven-membered heterocyclic ring has been developed.
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Affiliation(s)
- Shuai Wang
- Shandong Province Key Laboratory of Applied Mycology
- College of Chemistry and Pharmaceutical Sciences
- Qingdao Agricultural University
- Qingdao 266109
- China
| | - Xiao-De An
- Shandong Province Key Laboratory of Applied Mycology
- College of Chemistry and Pharmaceutical Sciences
- Qingdao Agricultural University
- Qingdao 266109
- China
| | - Shuai-Shuai Li
- Shandong Province Key Laboratory of Applied Mycology
- College of Chemistry and Pharmaceutical Sciences
- Qingdao Agricultural University
- Qingdao 266109
- China
| | - Xicheng Liu
- College of Chemistry and Chemical Engineering
- Qufu Normal University
- Qufu 273165
- China
| | - Qing Liu
- College of Chemical and Environmental Engineering
- Shandong University of Science and Technology
- Qingdao 266590
- China
| | - Jian Xiao
- Shandong Province Key Laboratory of Applied Mycology
- College of Chemistry and Pharmaceutical Sciences
- Qingdao Agricultural University
- Qingdao 266109
- China
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