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Kotha S, Cheekatla SR, Meshram M. Design and Synthesis of Cage Molecules as High Energy Density Materials for Aerospace Applications. ChemCatChem 2020. [DOI: 10.1002/cctc.202001475] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Sambasivarao Kotha
- Department of Chemistry Indian Institute of Technology Bombay Powai Mumbai 400 076 India
| | - Subba Rao Cheekatla
- Department of Chemistry Indian Institute of Technology Bombay Powai Mumbai 400 076 India
| | - Milind Meshram
- Department of Chemistry The K.R.T. Arts B.H. Commerce & A.M. Science College Nashik 422 002 India
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Kotha S, Ansari S, Cheekatla SR. 7-Meth-oxy-penta-cyclo-[5.4.0.0 2,6.0 3,10.0 5,9]undec-ane-8,11-dione. IUCRDATA 2020; 5:x201380. [PMID: 36339030 PMCID: PMC9462166 DOI: 10.1107/s2414314620013802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Accepted: 10/15/2020] [Indexed: 11/29/2022] Open
Abstract
The structure of 7-meth-oxy-penta-cyclo-[5.4.0.02,6.03,10.05,9]undecane-8,11-dione, C12H12O3, at 150 K has monoclinic (P21/c) symmetry. The penta-cyclo-undecane cage compound is composed of four five-membered rings, a planar four-membered ring and a six-membered ring in a boat conformation fused into a closed strained-cage framework. All of the five-membered rings adopt an envelope conformation.
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Affiliation(s)
- Sambasivarao Kotha
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai - 400076, India
| | - Saima Ansari
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai - 400076, India
| | - Subba Rao Cheekatla
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai - 400076, India
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Kotha S, Cheekatla SR. A new skeletal rearrangement of 1,7-dimethyl Cookson's cage dione catalyzed by a Lewis acid. Org Biomol Chem 2020; 18:1377-1383. [PMID: 31998915 DOI: 10.1039/c9ob02298h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A methyl-substituted polycyclic cage dione containing the PCUD framework has undergone an unprecedented ring rearrangement approach. Here, the PCUD framework with the aid of a Lewis acid such as BF3·MeOH gave unusual fragmentation products. Two new products were isolated via the skeletal rearrangement process involving carbocation mediated intermediates. The substituents in the succinyl bond present in the strained PCUD skeleton produce a driving force for the rearrangement in an unprecedented manner. Interestingly, the cyclobutane ring was transformed to cyclopentane through the cleavage of the C1-C7 bond during the ring-expansion process of PCUD via the carbocation intermediates. Unexpectedly, solvent (benzene) was captured during the ring-homologation process due to the presence of methyl substituents placed at the cyclobutane ring of the cage framework. It appears that this is the first report where an unexpected ring-rearrangement, ring-homologation, and ring-fragmentation occur with the aid of the BF3·MeOH complex.
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Affiliation(s)
- Sambasivarao Kotha
- Department of Chemistry, Indian Institute of Technology-Bombay, Powai, India.
| | - Subba Rao Cheekatla
- Department of Chemistry, Indian Institute of Technology-Bombay, Powai, India.
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Kotha S, Cheekatla SR. Design, synthesis, and rearrangement studies of gem-dimethyl containing cage systems. Tetrahedron 2020. [DOI: 10.1016/j.tet.2019.130898] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Kotha S, Rao Cheekatla S. Design and Synthesis of Pentacycloundecane Cage Compound Containing Oxazole Moiety. HETEROCYCLES 2020. [DOI: 10.3987/com-20-14288] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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Synthesis of functionalized cage propellanes and D3-Trishomocubanes via the ring-closing metathesis and acid-promoted rearrangement. Tetrahedron 2019. [DOI: 10.1016/j.tet.2018.11.027] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Kotha S, Cheekatla SR. Molecular Acrobatics in Polycyclic Frames: Synthesis of Functionalized D 3-Trishomocubanes via the Rearrangement Approach. J Org Chem 2018; 83:6315-6324. [PMID: 29768916 DOI: 10.1021/acs.joc.8b00449] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
A new synthetic route to D3-trishomocubanone and oxa- D3-trishomocubane derivatives has been established by the rearrangement approach. A remotely located methyl substituent in the six-membered ring contributed to the acid-catalyzed rearrangement of the cage dione in an unusual fashion. This rearrangement approach provided an attractive route to extended D3-trishomocubanes, which are not accessible by the conventional multistep synthetic sequence. For the first time, two phenyl groups were incorporated from the solvent into the strained trishomocubane skeleton in an unprecedented manner via carbocation-mediated rearrangement with the aid of BF3·OEt2. Interestingly, an oxa-bridged trishomocubane skeleton was also formed during acid-promoted rearrangement.
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Affiliation(s)
- Sambasivarao Kotha
- Department of Chemistry , Indian Institute of Technology-Bombay , Powai , India
| | - Subba Rao Cheekatla
- Department of Chemistry , Indian Institute of Technology-Bombay , Powai , India
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Cai Y, Yang L, Niu F, Liao K, Buch S. Role of Sigma-1 Receptor in Cocaine Abuse and Neurodegenerative Disease. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2017; 964:163-175. [PMID: 28315271 DOI: 10.1007/978-3-319-50174-1_12] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Sigma-1 receptors (Sig-1R) are recognized as a unique class of non-G protein-coupled intracellular protein. Sig-1R binds to its ligand such as cocaine , resulting in dissociation of Sig-1R from mitochondrion-associated ER membrane (MAM) to the endoplasmic reticulum (ER), plasma membrane, and nuclear membrane, regulating function of various proteins. Sig-1R has diverse roles in both physiological as well as in pathogenic processes. The disruption of Sig-1R pathways has been implicated as causative mechanism(s) in the development of both neurodegenerative disorders such as Alzheimer disease (AD ), Parkinson disease (PD ), amyotrophic lateral sclerosis (ALS ) and Huntington Disease (HD ) . Additionally, the interaction of cocaine and Sig-1R has more recently been implicated in potentiating the pathogenesis of HIV-associated neurocognitive disorders (HAND) through impairment of blood-brain barrier (BBB), microglial activation and astrogliosis. On the other hand, restoration of Sig-1R homeostasis has been shown to exert neuroprotective effects. In this review, we provide an overview of how Sig-1R plays a role in the pathogenesis of neurodegenerative disorders and cocaine and implications for future development of therapeutic strategies.
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Affiliation(s)
- Yu Cai
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, 985880 Nebraska Medical Center, DRC 8024, Omaha, NE, 68198-5880, USA
| | - Lu Yang
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, 985880 Nebraska Medical Center, DRC 8024, Omaha, NE, 68198-5880, USA
| | - Fang Niu
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, 985880 Nebraska Medical Center, DRC 8024, Omaha, NE, 68198-5880, USA
| | - Ke Liao
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, 985880 Nebraska Medical Center, DRC 8024, Omaha, NE, 68198-5880, USA
| | - Shilpa Buch
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, 985880 Nebraska Medical Center, DRC 8024, Omaha, NE, 68198-5880, USA.
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Mishura AM, Sklyarova AS, Shamota TV, Rodionov VN, Fokin AA. Preparative synthesis of pentacyclo[6.3.0.02,6.03,10.05,9]undecan-4-one (D 3-trishomocubanone). RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2014. [DOI: 10.1134/s1070428014100224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Joubert J, Geldenhuys WJ, Van der Schyf CJ, Oliver DW, Kruger HG, Govender T, Malan SF. Polycyclic cage structures as lipophilic scaffolds for neuroactive drugs. ChemMedChem 2012; 7:375-84. [PMID: 22307951 DOI: 10.1002/cmdc.201100559] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2011] [Indexed: 11/12/2022]
Abstract
Polycyclic cage scaffolds have been successfully used in the development of numerous lead compounds demonstrating activity in the central nervous system (CNS). Several neurodegenerative diseases, such as Alzheimer's disease, Parkinson's disease, Huntington's disease, schizophrenia, and stroke, as well as drug abuse, can be modulated with polycyclic cage derivatives. These cage moieties, including adamantane and pentacycloundecane derivatives, improve the pharmacokinetic and pharmacodynamic properties of conjugated parent drugs and serve as an important scaffold in the design of therapeutically active agents for the treatment of neurological disorders. In this Minireview, we focus on the recent developments in the field of polycyclic cage compounds, as well as the relationship between the lipophilic character of these cage-derived drugs and the ability of such compounds to target and reach the CNS and improve the pharmacodynamic properties of compounds conjugated to it.
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Affiliation(s)
- Jacques Joubert
- School of Pharmacy, University of the Western Cape, Private Bag X17, Bellville 7535, South Africa
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Neuroprotective effects of SCM198 on 6-hydroxydopamine-induced behavioral deficit in rats and cytotoxicity in neuronal SH-SY5Y cells. Neurochem Int 2011; 58:851-60. [DOI: 10.1016/j.neuint.2010.11.007] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2010] [Revised: 11/04/2010] [Accepted: 11/10/2010] [Indexed: 11/19/2022]
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New oxapolycyclic cage amines with NMDA receptor antagonist and trypanocidal activities. Bioorg Med Chem 2010; 18:46-57. [DOI: 10.1016/j.bmc.2009.11.017] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2009] [Revised: 11/05/2009] [Accepted: 11/07/2009] [Indexed: 11/23/2022]
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