101
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102
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Chandrasekhar S. THE HYDRODYNAMIC STABILITY OF VISCID FLOW BETWEEN COAXIAL CYLINDERS. Proc Natl Acad Sci U S A 2006; 46:141-3. [PMID: 16590590 PMCID: PMC285028 DOI: 10.1073/pnas.46.1.141] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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103
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Backus GE, Chandrasekhar S. ON COWLING'S THEOREM ON THE IMPOSSIBILITY OF SELF-MAINTAINED AXISYMMETRIC HOMOGENEOUS DYNAMOS. Proc Natl Acad Sci U S A 2006; 42:105-9. [PMID: 16589828 PMCID: PMC528226 DOI: 10.1073/pnas.42.3.105] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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104
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Chandrasekhar S. THE STABILITY OF NON-DISSIPATIVE COUETTE FLOW IN HYDROMAGNETICS. Proc Natl Acad Sci U S A 2006; 46:253-7. [PMID: 16590616 PMCID: PMC222823 DOI: 10.1073/pnas.46.2.253] [Citation(s) in RCA: 446] [Impact Index Per Article: 24.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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105
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Chandrasekhar S, Basu D, Rambabu C. Three-component coupling of alkynes, Baylis–Hillman adducts and sodium azide: a new synthesis of substituted triazoles. Tetrahedron Lett 2006. [DOI: 10.1016/j.tetlet.2006.03.037] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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106
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Chandrasekhar S, Chandrashekar G, Vijeender K, Reddy MS. Synthesis of trisubstituted alkenes by reductive dehydroxylation of Baylis–Hillman adducts using polymethylhydrosiloxane (PMHS) and catalytic B(C6F5)3. Tetrahedron Lett 2006. [DOI: 10.1016/j.tetlet.2006.03.014] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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107
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Chandrasekhar S, Saritha B, Jagadeshwar V, Narsihmulu C, Vijay D, Sarma GD, Jagadeesh B. Hydroxy-assisted catalyst-free Michael addition-dehydroxylation of Baylis–Hillman adducts in poly(ethylene glycol). Tetrahedron Lett 2006. [DOI: 10.1016/j.tetlet.2006.02.104] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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108
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Chandrasekhar S, Reddy NR, Sultana SS, Narsihmulu C, Reddy KV. l-Proline catalysed asymmetric aldol reactions in PEG-400 as recyclable medium and transfer aldol reactions. Tetrahedron 2006. [DOI: 10.1016/j.tet.2005.09.122] [Citation(s) in RCA: 108] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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109
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Chandrasekhar S, Shyamsunder T, Prakash SJ, Prabhakar A, Jagadeesh B. First total synthesis of (−)-diospongin B. Tetrahedron Lett 2006. [DOI: 10.1016/j.tetlet.2005.10.129] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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110
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Chandrasekhar S, Prakash SJ, Shyamsunder T. Asymmetric synthesis of the pyran antibiotic (−)-centrolobine. Tetrahedron Lett 2005. [DOI: 10.1016/j.tetlet.2005.07.162] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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111
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Chandrasekhar S, Jagadeshwar V, Prakash SJ. Total synthesis of the alkaloid (−)-codonopsinine from l-xylose. Tetrahedron Lett 2005. [DOI: 10.1016/j.tetlet.2005.02.140] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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112
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Chandrasekhar S, Rao YS, Reddy NR. B(C6F5)3-Catalyzed Synthesis of β-Keto Enol Ethers from β-Diketones. Synlett 2005. [DOI: 10.1055/s-2005-868522] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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113
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Chandrasekhar S, Narsihmulu C, Sultana SS, Srinivasa Reddy M. The first stereoselective total synthesis of (6S)-5,6-dihydro-6-[(2R)-2-hydroxy-6-phenylhexyl]-2H-pyran-2-one. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2004.10.059] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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114
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Chandrasekhar S, Narsihmulu C, Jagadeshwar V, sultana SS. Synthesis of C ring of Eleutherobin. ARKIVOC 2004. [DOI: 10.3998/ark.5550190.0006.312] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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115
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Chandrasekhar S, Babu BN, Reddy NR, Chandraiah L. Towards the synthesis of pyloricidins, synthesis of (2S,3R,4R,5S)-5-amino-2,3,4,6-tetrahydroxyhexanoyl-ß-D-phenyl alanine with differential protective groups. ARKIVOC 2004. [DOI: 10.3998/ark.5550190.0006.b06] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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116
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Chandrasekhar S, Fortier D, McAuley A. Additions and Corrections - Syntheses of Chromium and Copper Complexes of Hexaazamacrocycles. Crystal Structures of Chromium(III) Complexes of 1,4,7,10,13,16-Hexaazacyclooctadecane and 1,4,7,11,14,17-Hexaazacycloeicosane. Inorg Chem 2004. [DOI: 10.1021/ic00102a601] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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117
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Chandrasekhar S, Jagadeshwar V, Narsihmulu C, Sarangapani M, Krishna DR, Vidyasagar J, Vijay D, Sastry GN. Design, synthesis and cytotoxic studies on the simplified oxy analog of eleutherobin. Bioorg Med Chem Lett 2004; 14:3687-9. [PMID: 15203144 DOI: 10.1016/j.bmcl.2004.05.017] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2004] [Revised: 05/07/2004] [Accepted: 05/11/2004] [Indexed: 10/26/2022]
Abstract
A straight forward entry into nine membered B ring of eleutherobin as oxy analog and its cyctotoxic properties on HBL cell lines is described. Molecular modeling studies were carried out to ascertain the binding of the model compound to the active site of beta-tubulin.
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118
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Chandrasekhar S, Narsihmulu C, Saritha B, Shameem Sultana S. Poly(ethyleneglycol) (PEG): a rapid and recyclable reaction medium for the DABCO-catalyzed Baylis–Hillman reaction. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2004.05.153] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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119
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Chandrasekhar S, Chandrashekar G, Nagendra Babu B, Vijeender K, Venkatram Reddy K. Reductive etherification of carbonyl compounds with alkyl trimethylsilylethers using polymethylhydrosiloxane (PMHS) and catalytic B(C 6 F 5 ) 3. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2004.05.061] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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120
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Chandrasekhar S, Narsihmulu C, Reddy N, Sultana S. Asymmetric aldol reactions in poly(ethylene glycol) catalyzed by l-proline. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2004.03.116] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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121
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Chandrasekhar S, Narsihmulu C, Chandrashekar G, Shyamsunder T. Pd/CaCO3 in liquid poly(ethylene glycol) (PEG): an easy and efficient recycle system for partial reduction of alkynes to cis-olefins under a hydrogen atmosphere. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2004.01.097] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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122
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Onyia JE, Galvin RJS, Ma YL, Halladay DL, Miles RR, Yang X, Fuson T, Cain RL, Zeng QQ, Chandrasekhar S, Emkey R, Xu Y, Thirunavukkarasu K, Bryant HU, Martin TJ. Novel and Selective Small Molecule Stimulators of Osteoprotegerin Expression Inhibit Bone Resorption. J Pharmacol Exp Ther 2004; 309:369-79. [PMID: 14718597 DOI: 10.1124/jpet.103.057893] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Osteoprotegerin (OPG), a secreted member of the tumor necrosis factor receptor superfamily, is a potent inhibitor of osteoclast formation and bone resorption. Because OPG functions physiologically as a locally generated (paracrine) factor, we used high-throughput screening to identify small molecules that enhance the activity of the promoter of the human OPG gene. We found three structurally unrelated compounds that selectively increased OPG gene transcription, OPG mRNA levels, and OPG protein production and release by osteoblastic cells. Structural analysis of one compound, a benzamide derivative, led to the identification of four related molecules, which are also OPG inducers. The most potent of these compounds, Cmpd 5 inhibited osteoclast formation and parathyroid hormone-induced calvarial bone resorption. In vivo, Cmpd 5 completely blocked resorptive activity (serum calcium, osteoclast number) in parathyroid hormone-treated rats. Furthermore, Cmpd 5 reduced the ability of a rat breast cancer to metastasize to bone. Finally, the compound also prevented bone loss in a rat adjuvant arthritis model. These results provide proof of the concept that low molecular weight compounds can enhance OPG production in ways that can result in effective therapies.
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123
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Chandrasekhar S, Narsihmulu C, Reddy NR, Sultana SS. l-Proline catalyzed asymmetric transfer aldol reaction between diacetone alcohol and aldehydes. Chem Commun (Camb) 2004:2450-1. [PMID: 15514810 DOI: 10.1039/b409053p] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We demonstrate for the first time, L-proline as a chiral catalyst for transfer aldol reaction between aldehydes and diacetone alcohol.
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124
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Chandrasekhar S, Shyamsunder T, Chandrashekar G, Narsihmulu C. Hydrogenation and Hydrogenolysis with Pd/C in Poly(Ethylene Glycol) (PEG): A Practical and Recyclable Medium. Synlett 2004. [DOI: 10.1055/s-2003-45007] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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125
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Chandrasekhar S, Babu BN, Ahmed M, Reddy MV, Srihari P, Jagadeesh B, Prabhakar A. Safe and Convenient Reduction of Δ2-Isoxazolines with PMHS-Pd(OH)2/C. Synlett 2004. [DOI: 10.1055/s-2004-822917] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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