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Raju S, Ghosh P, Nayani K, Prashanth J, Sridhar B, Mainkar PS, Chandrasekhar S. Construction of Octahydro-4H-cyclopenta[b]pyridin-6-one Skeletons using Pot, Atom, and Step Economy (PASE) Synthesis. Chemistry 2023; 29:e202301058. [PMID: 37337465 DOI: 10.1002/chem.202301058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 06/19/2023] [Accepted: 06/19/2023] [Indexed: 06/21/2023]
Abstract
Cascade aza-Piancatelli reaction and [3+3]/[4+2] cycloaddition reactions are carried out using the ideality principles of pot, atom, and step economy (PASE) synthesis. The reaction resulted in generation of octahydro-4H-cyclopenta[b]pyridin-6-one scaffolds. Moreover, octahydro-5,7a-epoxycyclopenta[cd]isoindol-4-one frameworks of gracilamine alkaloid and a novel decahydro-1H-dicyclopenta[cd,hi]isoindol-6-one were also realized in good yields with excellent regio- and diastereo-selectivities.
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Affiliation(s)
- Silver Raju
- Department of Organic Synthesis and Process Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500007, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Palash Ghosh
- Department of Organic Synthesis and Process Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500007, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Kiranmai Nayani
- Department of Organic Synthesis and Process Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500007, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Jupally Prashanth
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
- Centre for X-ray Crystallography, Department of Analytical & Structural Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500007, India
| | - Balasubramanian Sridhar
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
- Centre for X-ray Crystallography, Department of Analytical & Structural Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500007, India
| | - Prathama S Mainkar
- Department of Organic Synthesis and Process Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500007, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Srivari Chandrasekhar
- Department of Organic Synthesis and Process Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad, 500007, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
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Ohsawa K, Ochiai S, Kubota J, Doi T. Gold-Catalyzed Amide/Carbamate-Linked N,O-Acetal Formation with Bulky Amides and Alcohols. J Org Chem 2020; 86:1281-1291. [DOI: 10.1021/acs.joc.0c02640] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kosuke Ohsawa
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aza-aoba, Aramaki,
Aoba-ku, Sendai, 980-8578, Japan
| | - Shota Ochiai
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aza-aoba, Aramaki,
Aoba-ku, Sendai, 980-8578, Japan
| | - Junya Kubota
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aza-aoba, Aramaki,
Aoba-ku, Sendai, 980-8578, Japan
| | - Takayuki Doi
- Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aza-aoba, Aramaki,
Aoba-ku, Sendai, 980-8578, Japan
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Saha A, Bhattacharyya A, Talukdar R, Ghorai MK. Stereospecific Syntheses of Enaminonitriles and β-Enaminoesters via Domino Ring-Opening Cyclization (DROC) of Activated Cyclopropanes with Pronucleophilic Malononitriles. J Org Chem 2018; 83:2131-2144. [DOI: 10.1021/acs.joc.7b03033] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Amrita Saha
- Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India
| | | | - Ranadeep Talukdar
- 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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Conformational studies of new pseudotripeptide with pyrazine amidoxime motif and simplified analogs using IR, NMR spectroscopy, and molecular dynamic simulations. Struct Chem 2016. [DOI: 10.1007/s11224-016-0870-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Romero E, Moussodia RO, Kriznik A, Wenger E, Acherar S, Jamart-Grégoire B. Spontaneous Self-Assembly of Fully Protected Ester 1:1 [α/α-N α-Bn-hydrazino] Pseudodipeptides into a Twisted Parallel β-Sheet in the Crystal State. J Org Chem 2016; 81:9037-9045. [PMID: 27627436 DOI: 10.1021/acs.joc.6b01680] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Previous studies have demonstrated that amidic α/β-pseudodipeptides, 1:1 [α/α-Nα-Bn-hydrazino], have the ability to fold via a succession of γ-turn (C7 pseudocycle) and hydrazinoturn in CDCl3 solution, their amide terminals enabling the formation of an intramolecular H-bond network. Despite their lack of a primary amide terminals allowing the formation of the hydrazinoturn, their ester counterparts 1-4 were proven to self-assemble into C6 and C7 pseudocycles by intramolecular H-bonds in solution state and into an uncommon twisted parallel β-sheet through intermolecular H-bonding in the crystal state to form a supramolecular helix, with eight molecules needed to complete a full 360° rotation. Such self-organization (with eight molecules) has only been observed in a specific α/α-pseudodipeptide, depsipeptide (Boc-Leu-Lac-OEt). Relying on IR absorption, NMR, X-ray diffraction, and CD analyses, the aim of this study was to demonstrate that stereoisomers of ester 1:1 [α/α-Nα-Bn-hydrazino] pseudodipeptides 1-4 are able to self-assemble into this β-helical structure. The absolute configuration of the asymmetric Cα-atom of the α-amino acid residue influences the left- or right-handed twist without changing the pitch of the formed helix.
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Affiliation(s)
- Eugénie Romero
- Laboratoire de Chimie Physique Macromoléculaire (LCPM), Université de Lorraine-CNRS, UMR 7375 , 1 rue Grandville, BP 20451, 54001 Nancy cedex, France
| | - Ralph-Olivier Moussodia
- Laboratoire de Chimie Physique Macromoléculaire (LCPM), Université de Lorraine-CNRS, UMR 7375 , 1 rue Grandville, BP 20451, 54001 Nancy cedex, France
| | - Alexandre Kriznik
- Ingénierie Moléculaire et Physiopathologie Articulaire (IMoPA), Université de Lorraine-CNRS, UMR 7365 and Service Commun de Biophysique Interactions Moléculaires (SCBIM), Université de Lorraine, FR3209, Biopôle de l'Université de Lorraine, Campus Biologie Santé - Faculté de Médecine , 9 Avenue de la Forêt de Haye, CS 50184, 54505 Vandœuvre-lès-Nancy, France
| | - Emmanuel Wenger
- Laboratoire de Crystallographie, Résonance Magnétique et Modélisations (CRM2), Université de Lorraine-CNRS, UMR 7036, Faculté des Sciences et Technologies , BP 70239, Boulevard des Aiguillettes, 54506 Vandœuvre-lès-Nancy cedex, France
| | - Samir Acherar
- Laboratoire de Chimie Physique Macromoléculaire (LCPM), Université de Lorraine-CNRS, UMR 7375 , 1 rue Grandville, BP 20451, 54001 Nancy cedex, France
| | - Brigitte Jamart-Grégoire
- Laboratoire de Chimie Physique Macromoléculaire (LCPM), Université de Lorraine-CNRS, UMR 7375 , 1 rue Grandville, BP 20451, 54001 Nancy cedex, France
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Substituted 4-morpholine N-arylsulfonamides as γ-secretase inhibitors. Eur J Med Chem 2016; 124:36-48. [PMID: 27560281 DOI: 10.1016/j.ejmech.2016.08.024] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2016] [Revised: 08/11/2016] [Accepted: 08/12/2016] [Indexed: 11/23/2022]
Abstract
The design, synthesis, SAR, and biological profile of a substituted 4-morpholine sulfonamide series of γ-secretase inhibitors (GSIs) were described. In several cases, the resulting series of GSIs reduced CYP liabilities and improved γ-secretase inhibition activity compared to our previous research series. Selected compounds demonstrated significant reduction of amyloid-β (Aβ) after acute oral dosing in a transgenic animal model of Alzheimer's disease (AD).
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Avan I, Hall CD, Katritzky AR. Peptidomimetics via modifications of amino acids and peptide bonds. Chem Soc Rev 2014; 43:3575-94. [DOI: 10.1039/c3cs60384a] [Citation(s) in RCA: 183] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Fremaux J, Dolain C, Kauffmann B, Clayden J, Guichard G. Influence of achiral units with gem-dimethyl substituents on the helical character of aliphatic oligourea foldamers. Chem Commun (Camb) 2013; 49:7415-7. [DOI: 10.1039/c3cc40961a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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