101
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Yamaguchi J, Yamaguchi AD, Itami K. CH Bond Functionalization: Emerging Synthetic Tools for Natural Products and Pharmaceuticals. Angew Chem Int Ed Engl 2012; 51:8960-9009. [DOI: 10.1002/anie.201201666] [Citation(s) in RCA: 2423] [Impact Index Per Article: 201.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2012] [Indexed: 01/04/2023]
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102
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Campolo D, Gaudel-Siri A, Mondal S, Siri D, Besson E, Vanthuyne N, Nechab M, Bertrand MP. Mechanistic Investigation of Enediyne-Connected Amino Ester Rearrangement. Theoretical Rationale for the Exclusive Preference for 1,6- or 1,5-Hydrogen Atom Transfer Depending on the Substrate. A Potential Route to Chiral Naphthoazepines. J Org Chem 2012; 77:2773-83. [DOI: 10.1021/jo202580y] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Damien Campolo
- Institut
de Chimie Radicalaire, CNRS UMR 7273, Equipes CMO and
CTM, and ‡ISM2, CNRS UMR 7313, Equipe Chirosciences, Aix-Marseille Université, 13397 Cedex 20, Marseille, France
| | - Anouk Gaudel-Siri
- Institut
de Chimie Radicalaire, CNRS UMR 7273, Equipes CMO and
CTM, and ‡ISM2, CNRS UMR 7313, Equipe Chirosciences, Aix-Marseille Université, 13397 Cedex 20, Marseille, France
| | - Shovan Mondal
- Institut
de Chimie Radicalaire, CNRS UMR 7273, Equipes CMO and
CTM, and ‡ISM2, CNRS UMR 7313, Equipe Chirosciences, Aix-Marseille Université, 13397 Cedex 20, Marseille, France
| | - Didier Siri
- Institut
de Chimie Radicalaire, CNRS UMR 7273, Equipes CMO and
CTM, and ‡ISM2, CNRS UMR 7313, Equipe Chirosciences, Aix-Marseille Université, 13397 Cedex 20, Marseille, France
| | - Eric Besson
- Institut
de Chimie Radicalaire, CNRS UMR 7273, Equipes CMO and
CTM, and ‡ISM2, CNRS UMR 7313, Equipe Chirosciences, Aix-Marseille Université, 13397 Cedex 20, Marseille, France
| | - Nicolas Vanthuyne
- Institut
de Chimie Radicalaire, CNRS UMR 7273, Equipes CMO and
CTM, and ‡ISM2, CNRS UMR 7313, Equipe Chirosciences, Aix-Marseille Université, 13397 Cedex 20, Marseille, France
| | - Malek Nechab
- Institut
de Chimie Radicalaire, CNRS UMR 7273, Equipes CMO and
CTM, and ‡ISM2, CNRS UMR 7313, Equipe Chirosciences, Aix-Marseille Université, 13397 Cedex 20, Marseille, France
| | - Michèle P. Bertrand
- Institut
de Chimie Radicalaire, CNRS UMR 7273, Equipes CMO and
CTM, and ‡ISM2, CNRS UMR 7313, Equipe Chirosciences, Aix-Marseille Université, 13397 Cedex 20, Marseille, France
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103
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Hao HD, Li Y, Han WB, Wu Y. A hydrogen peroxide based access to qinghaosu (artemisinin). Org Lett 2011; 13:4212-5. [PMID: 21761857 DOI: 10.1021/ol2015434] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Attachment of H(2)O(2) onto the highly hindered quaternary C-12a in an advanced qinghaosu (artemisinin) precursor has been achieved through a facile perhydrolysis of a spiro epoxy ring with the aid of a previously unknown molybdenum species without involving any special equipment or complicated operations. The resultant β-hydroxyhydroperoxide can be further elaborated into qinghaosu, illustrating an entry fundamentally different from the existing ones to this outstanding natural product of great importance in malaria chemotherapy.
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Affiliation(s)
- Hong-Dong Hao
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
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104
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Wei HL, Piou T, Dufour J, Neuville L, Zhu J. Iodo-Carbocyclization of Electron-Deficient Alkenes: Synthesis of Oxindoles and Spirooxindoles. Org Lett 2011; 13:2244-7. [DOI: 10.1021/ol2005243] [Citation(s) in RCA: 101] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hai-Long Wei
- Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, 91198 Gif-sur-Yvette Cedex, France, and Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, EPFL-SB-ISIC-LSPN, CH-1015 Lausanne, Switzerland
| | - Tiffany Piou
- Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, 91198 Gif-sur-Yvette Cedex, France, and Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, EPFL-SB-ISIC-LSPN, CH-1015 Lausanne, Switzerland
| | - Jeremy Dufour
- Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, 91198 Gif-sur-Yvette Cedex, France, and Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, EPFL-SB-ISIC-LSPN, CH-1015 Lausanne, Switzerland
| | - Luc Neuville
- Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, 91198 Gif-sur-Yvette Cedex, France, and Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, EPFL-SB-ISIC-LSPN, CH-1015 Lausanne, Switzerland
| | - Jieping Zhu
- Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles, CNRS, 91198 Gif-sur-Yvette Cedex, France, and Institute of Chemical Sciences and Engineering, Ecole Polytechnique Fédérale de Lausanne, EPFL-SB-ISIC-LSPN, CH-1015 Lausanne, Switzerland
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105
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Newhouse T, Baran PS. If C-H bonds could talk: selective C-H bond oxidation. Angew Chem Int Ed Engl 2011; 50:3362-74. [PMID: 21413105 PMCID: PMC3980681 DOI: 10.1002/anie.201006368] [Citation(s) in RCA: 1068] [Impact Index Per Article: 82.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2010] [Revised: 01/10/2011] [Indexed: 11/11/2022]
Abstract
C-H oxidation has a long history and an ongoing presence in research at the forefront of chemistry and interrelated fields. As such, numerous highly useful articles and reviews have been written on this subject. Logically, these are generally written from the perspective of the scope and limitations of the reagents employed. This Minireview instead attempts to emphasize chemoselectivity imposed by the nature of the substrate. Consequently, many landmark discoveries in the field of C-H oxidation are not discussed, but hopefully the perspective taken herein will allow C-H oxidation reactions to be more readily incorporated into synthetic planning.
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Affiliation(s)
- Timothy Newhouse
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037 (USA)
| | - Phil S. Baran
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037 (USA)
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106
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Newhouse T, Baran PS. Wenn C-H-Bindungen sprechen könnten - selektive Oxidationen von C-H-Bindungen. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201006368] [Citation(s) in RCA: 319] [Impact Index Per Article: 24.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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107
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León EI, Martín A, Peréz-Martín I, Quintanal LM, Suárez E. Hydrogen Atom Transfer Experiments Provide Chemical Evidence for the Conformational Differences between C- and O-Disaccharides. European J Org Chem 2010. [DOI: 10.1002/ejoc.201000470] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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108
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Abstract
An approach toward the synthesis of the complex polycyclic diterpene maoecrystal V (1) is described. Construction of the advanced tetracyclic core structure (i.e., 19) was achieved in 13 steps from 3,3-dimethylcyclohexanone (6) by employing a stereoselective Nazarov cyclization followed by a Diels-Alder reaction to forge the two contiguous quaternary stereocenters.
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Affiliation(s)
- Kiel E. Lazarski
- Department of Chemistry, Northwestern University, 2145 Sheridan Road Evanston, Illinois 60208
| | - Dennis X. Hu
- Department of Chemistry, Northwestern University, 2145 Sheridan Road Evanston, Illinois 60208
| | - Charlotte L. Stern
- Department of Chemistry, Northwestern University, 2145 Sheridan Road Evanston, Illinois 60208
| | - Regan J. Thomson
- Department of Chemistry, Northwestern University, 2145 Sheridan Road Evanston, Illinois 60208
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109
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Sperry J, Liu YC(W, Brimble MA. Synthesis of natural products containing spiroketals via intramolecular hydrogen abstraction. Org Biomol Chem 2010; 8:29-38. [DOI: 10.1039/b916041h] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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110
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Francisco C, Herrera A, Kennedy A, Martín A, Melián D, Pérez-Martín I, Quintanal L, Suárez E. Intramolecular 1,8-Hydrogen-Atom Transfer Reactions in (1→4)-O-Disaccharide Systems: Conformational and Stereochemical Requirements. Chemistry 2008; 14:10369-81. [DOI: 10.1002/chem.200801414] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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111
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Martín A, Pérez-Martín I, Quintanal LM, Suárez E. Stereoselective synthesis of C-ketosides by sequential intramolecular hydrogen atom transfer–intermolecular allylation reaction. Tetrahedron Lett 2008. [DOI: 10.1016/j.tetlet.2008.06.070] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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112
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Yuan X, Liu K, Li C. Development of Highly Regioselective Amidyl Radical Cyclization Based on Lone Pair−Lone Pair Repulsion. J Org Chem 2008; 73:6166-71. [DOI: 10.1021/jo800845b] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xinting Yuan
- Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Road, Shanghai 200032, Peopleʼs Republic of China
| | - Kun Liu
- Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Road, Shanghai 200032, Peopleʼs Republic of China
| | - Chaozhong Li
- Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Road, Shanghai 200032, Peopleʼs Republic of China
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113
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114
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Francisco CG, Freire R, Herrera AJ, Pérez-Martín I, Suárez E. Intramolecular 1,5- versus 1,6-hydrogen abstraction reaction promoted by alkoxyl radicals in pyranose and furanose models. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.06.023] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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115
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Hydrogen atom transfer experiments provide chemical evidence for the conformational differences between C- and O-glycosides. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2007.05.166] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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116
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A. Paquette L, R. Selvaraj P. Do Upper Limits to the Multiple Spiro Acetalization of the Cyclohexane Ring Exist? HETEROCYCLES 2007. [DOI: 10.3987/com-07-s(u)4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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117
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Ferjancic Z, Matovic R, Cekovic Z, Jiang Y, Snyder JP, Trajkovic V, Saicic RN. Synthesis, biology, and modeling of a C-4 carbonyl C,D-seco-taxoid. Tetrahedron 2006. [DOI: 10.1016/j.tet.2006.06.080] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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118
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Hu T, Shen M, Chen Q, Li C. Pushing Radical Cyclization from Regioselective to Regiospecific: Cyclization of Amidyl Radicals Controlled by Vinylic Halogen Substitution. Org Lett 2006; 8:2647-50. [PMID: 16737335 DOI: 10.1021/ol060983q] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Efficient and regiospecific 6-exo, 7-endo, 7-exo, and even 8-endo amidyl radical cyclizations can be accomplished by the direct reactions of unsaturated N-H amides if they bear a vinylic halogen (Cl, Br, I) substituent. This remarkable halogen-substitution effect could be rationalized in terms of lone pair-lone pair electron repulsion between the N radical and the vinylic halogen atom, in addition to the well-known steric and radical-stabilizing effect. [reaction: see text]
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Affiliation(s)
- Tianshun Hu
- Shanghai Istitute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Road, Shanghai 200032, P. R. China
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119
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Aho JE, Pihko PM, Rissa TK. Nonanomeric Spiroketals in Natural Products: Structures, Sources, and Synthetic Strategies. Chem Rev 2005; 105:4406-40. [PMID: 16351049 DOI: 10.1021/cr050559n] [Citation(s) in RCA: 325] [Impact Index Per Article: 17.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jatta E Aho
- Laboratory of Organic Chemistry, Helsinki University of Technology, TKK, Finland
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120
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121
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De Dobbeleer C, Ates A, Vanherk JC, Markó IE. Efficient access to functionalised medium-ring systems by radical fragmentation/radical addition to α-iodoketones. Tetrahedron Lett 2005. [DOI: 10.1016/j.tetlet.2005.03.200] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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122
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Iglesias-Arteaga MA, Ledesma-Rodrı́guez FL, Méndez-Stivalet JM, Flores-Alamo M. Reaction of a 5α-bromo-6β,19-epoxysteroid with BF3·Et2O/Ac2O. Tetrahedron Lett 2005. [DOI: 10.1016/j.tetlet.2005.02.149] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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123
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Bøjstrup M, Lundt I. Synthesis of aminocyclopentanols: α-d-galacto configured sugar mimics. Org Biomol Chem 2005; 3:1738-45. [PMID: 15858658 DOI: 10.1039/b501824b] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Four aminocyclopentanols, as mimics of putative intermediates in the hydrolysis of alpha-d-galactosides, have been synthesized through a number of stereoselective transformations using the cis-fused cyclopentane-1,4-lactone (1R, 5S, 7R, 8R)-7,8-dihydroxy-2-oxabicyclo[3.3.0]oct-3-one as a chiral building block. The compounds were tested towards various glycosidases but showed no anomer selectivity in the inhibition of alpha- and beta-galactosidases.
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Affiliation(s)
- Marie Bøjstrup
- Department of Chemistry, Technical University of Denmark, Building 201, DK-2800, Kgs. Lyngby, Denmark
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124
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Yoshimitsu T, Sasaki S, Arano Y, Nagaoka H. Studies on the Total Synthesis of (−)-CP-263,114. J Org Chem 2004; 69:9262-8. [PMID: 15609965 DOI: 10.1021/jo048681u] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Alkoxyl radicals have a wide range of applications in organic synthesis due to their remarkable chemical properties in molecular transformation. The present study shows two types of alkoxyl radicals (primary vs tertiary) to selectively undergo dehydrogenation and beta-scission to give rise to key structural elements of (-)-CP-263,114 (1). By alkoxyl radical transformation followed by installation of the C19-C25 (CP numbering) side chain and the bridged bisacetal unit, the functionalized CP precursor 2 was obtained.
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Affiliation(s)
- Takehiko Yoshimitsu
- Meiji Pharmaceutical University, 2-522-1 Noshio, Kiyose, Tokyo 204-8588, Japan.
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125
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Shen M, Li C. Asymmetric Iodolactamization Induced by Chiral Oxazolidine Auxiliary. J Org Chem 2004; 69:7906-9. [PMID: 15527268 DOI: 10.1021/jo0488006] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Asymmetric iodolactamization reactions of unsaturated amides with oxazolidines as the chiral auxiliaries were investigated. With (4S)-4-((2R)-2-butyl)-2,2-dimethyloxazolidine as the auxiliary and LiH as the base, a number of unsaturated amides underwent iodolactamization smoothly to afford the corresponding gamma- and delta-lactams in 30-98% yield with de values up to 97%.
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Affiliation(s)
- Meihua Shen
- Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Road, Shanghai 200032, P. R. China
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126
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Trost BM, Shen HC, Surivet JP. Biomimetic Enantioselective Total Synthesis of (−)-Siccanin via the Pd-Catalyzed Asymmetric Allylic Alkylation (AAA) and Sequential Radical Cyclizations. J Am Chem Soc 2004; 126:12565-79. [PMID: 15453789 DOI: 10.1021/ja048084p] [Citation(s) in RCA: 92] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
(-)-Siccanin (1), a natural product possessing significant antifungal properties, was synthesized enantioselectively via a biomimetic route. This synthetic route features two sequential radical cyclizations: a Ti(III)-mediated radical cyclization of epoxyolefin 48 to construct the B-ring, and a Suarez reaction to establish the tetrahyrofuran ring. Chiral chroman moiety of siccanin was prepared based on our recent development of the Pd-catalyzed asymmetric allylic alkylation (AAA) of phenol trisubstituted allyl carbonates. Several other members of the siccanin family were also synthesized including siccanochromenes A (2), B (3), E (6), F (7), and the methyl ether of siccanochromene C (55). These studies may shed light on the biosynthesis of this novel family of compounds.
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Affiliation(s)
- Barry M Trost
- Department of Chemistry, Stanford University, Stanford, California 94305-5080, USA.
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127
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Tang Y, Li C. Facile 5-Endo Amidyl Radical Cyclization Promoted by Vinylic Iodine Substitution. Org Lett 2004; 6:3229-31. [PMID: 15355019 DOI: 10.1021/ol049052+] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[reaction: see text] BF(3).OEt(2)-catalyzed atom-transfer radical addition of iodoacetamides to alkynes yielded the corresponding vinyl iodides, which upon treatment with (t)BuOCl and I(2) afforded gamma-lactam derivatives in moderate to good yield. The mechanism was proposed to be 5-endo amidyl radical cyclization, and vinylic iodine substitution provided the driving force for the cyclization.
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Affiliation(s)
- Yu Tang
- Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Road, Shanghai 200032, China
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128
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129
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Ates A, Gautier A, Leroy B, Plancher JM, Quesnel Y, Vanherck JC, Markó IE. Mild and chemoselective catalytic deprotection of ketals and acetals using cerium(IV) ammonium nitrate. Tetrahedron 2003. [DOI: 10.1016/j.tet.2003.03.002] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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130
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131
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New silicon-mediated ring expansion of n-sized conjugated cycloalkenones into homoallylic n+3 lactones. Tetrahedron Lett 2003. [DOI: 10.1016/s0040-4039(03)01308-x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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132
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Cornella I, Pérez Sestelo J, Mouriño A, Sarandeses LA. Synthesis of new 18-substituted analogues of calcitriol using a photochemical remote functionalization. J Org Chem 2002; 67:4707-14. [PMID: 12098279 DOI: 10.1021/jo020022z] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A novel convergent synthetic approach to new analogues of calcitriol modified at the C-18 position is reported. The key step in the synthesis is the 20-hydroxyl-directed photochemical iodination of the 18-methyl group in the presence of (diacetoxyiodo)benzene. Using this methodology, two new analogues of calcitriol were prepared: the first contains a hydroxylated alkyl side chain attached at C-18 with the natural side chain replaced by an isopropylidene group; the second is a conformationally locked analogue due to an extra oxacycle between the C-18 and C-20 positions.
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Affiliation(s)
- Iván Cornella
- Departamento de Química Fundamental, Universidade da Coruña, E-15071 A Coruña, Spain
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133
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Francisco CG, Freire R, Herrera AJ, Peréz-Martín I, Suárez E. Intramolecular 1,5- versus 1,6-hydrogen abstraction reaction promoted by alkoxy radicals in carbohydrate models. Org Lett 2002; 4:1959-61. [PMID: 12027657 DOI: 10.1021/ol025981u] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[reaction: see text] The alkoxy radical generated by reaction of 3,7-anhydro-2-deoxyoctitols with (diacetoxyiodo)benzene (DIB) and iodine abstracts regioselectively either the proton at C7 or that at C4 depending on the electronegativity of the substituent at C4. The correct election of this substituent can switch the reaction to give 2,9-dioxabicyclo[3.3.1]nonane or hexahydro-2H-furo[3,2-b]pyran ring systems.
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Affiliation(s)
- Cosme G Francisco
- Instituto de Productos Naturales y Agrobiología del C.S.I.C. Carretera de La Esperanza 3, 38206 La Laguna, Tenerife, Spain
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134
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Francisco CG, Herrera AJ, Kennedy AR, Melián D, Suárez E. Intramolecular 1,8-Hydrogen Abstraction Between Glucopyranose Units in a Disaccharide Model Promoted by Alkoxy Radicals. Angew Chem Int Ed Engl 2002. [DOI: 10.1002/1521-3757(20020301)114:5<884::aid-ange884>3.0.co;2-s] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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135
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Francisco CG, Herrera AJ, Kennedy AR, Melián D, Suárez E. Intramolecular 1,8-hydrogen abstraction between glucopyranose units in a disaccharide model promoted by alkoxy radicals. Angew Chem Int Ed Engl 2002; 41:856-8. [PMID: 12491359 DOI: 10.1002/1521-3773(20020301)41:5<856::aid-anie856>3.0.co;2-f] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Cosme G Francisco
- Instituto de Productos Naturales y Agrobiología del C.S.I.C., Carretera de La Esperanza 3, 38206 La Laguna, Tenerife, Spain
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136
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Abstract
Hecogenin acetate was converted to ritterazine M in 16 operations with an average yield per opearation of 87%. The overall linear yield was 12%. This confirmed 1 as the corrected structure for ritterazine M by total synthesis.
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Affiliation(s)
- Seongmin Lee
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, USA
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137
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Lee S, LaCour TG, Lantrip D, Fuchs PL. Redox refunctionalization of steroid spiroketals. Structure correction of ritterazine M. Org Lett 2002; 4:313-6. [PMID: 11820867 DOI: 10.1021/ol0165894] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The structure of the North spiroketal moiety of ritterazine M has been corrected from 1a to 1b. This was accomplished by comparison of published spectra of the natural product with five synthetic spiroketal-alcohols. Synthesis of these models was efficiently accomplished by reductive cleavage of the spiroketal and Sharpless asymmetric dihydroxylation of an isopentyl, methyl 1,1-disubstituted olefin, followed by Suarez iodine[III] oxidative spirocyclization of monoprotected 1 degree,3 degree 1,2 diols.
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Affiliation(s)
- Seongmin Lee
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, USA
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138
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Pellissier H, Santelli M. FUNCTIONALIZATION OF THE 18-METHYL GROUP OF STEROIDS. A REVIEW. ORG PREP PROCED INT 2001. [DOI: 10.1080/00304940109356614] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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139
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Barluenga J, González-Bobes F, Ananthoju SR, García-Martín MA, González JM. Oxidative Opening of Cycloalkanols: An Efficient Entry to omega-Iodocarbonyl Compounds This research was supported by DGES (Grant PB97-1271). F.G.-B. thanks FICYT for a fellowship. Angew Chem Int Ed Engl 2001; 40:3389-3392. [PMID: 11592147 DOI: 10.1002/1521-3773(20010917)40:18<3389::aid-anie3389>3.0.co;2-v] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- José Barluenga
- Instituto Universitario de Química Organometálica "Enrique Moles", Unidad Asociada al C.S.I.C Universidad de Oviedo 33071 Oviedo (Spain)
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140
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Barluenga J, González-Bobes F, Ananthoju SR, García-Martín MA, González JM. Die oxidative Öffnung von Cycloalkanolen: ein effizienter Zugang zuω-Iodcarbonylverbindungen. Angew Chem Int Ed Engl 2001. [DOI: 10.1002/1521-3757(20010917)113:18<3491::aid-ange3491>3.0.co;2-u] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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141
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Abstract
Work published over the last thirty years on the functionalization of unactivated positions in the steroid skeleton has been reviewed.
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Affiliation(s)
- P B Reese
- Chemistry Department, University of the West Indies, Mona, Kingston 7, Jamaica, West Indies, Jamaica.
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142
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143
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144
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Katohgi M, Togo H, Yamaguchi K, Yokoyama M. New synthetic method to 1,2-benzisothiazoline-3-one- 1,1-dioxides and 1,2-benzisothiazoline-3-one-1-oxides from N-alkyl(o-methyl) arenesulfonamides. Tetrahedron 1999. [DOI: 10.1016/s0040-4020(99)00974-6] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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145
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An approach to the synthesis of CP-263,114: complementary routes to the bicyclic ring system via two kinds of fragmentation reaction. Tetrahedron Lett 1999. [DOI: 10.1016/s0040-4039(99)00941-7] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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146
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Wipf P, Li W. Formation of Nine-Membered Lactams by Oxidative Ring Expansion of 4-Hydroxyhydroindoles: A Biomimetic Approach toward the Tuberostemonone Ring System? J Org Chem 1999; 64:4576-4577. [PMID: 11674523 DOI: 10.1021/jo9905064] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Peter Wipf
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260
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147
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Kittaka A, Kato H, Tanaka H, Nonaka Y, Amano M, Nakamura KT, Miyasaka T. Face selective 6,1′-(1-oxo)ethano bridge formation of uracil nucleosides under hypoiodite reaction conditions. Tetrahedron 1999. [DOI: 10.1016/s0040-4020(99)00232-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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148
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Ates A, Gautier A, Leroy B, Plancher JM, Quesnel Y, Markó IE. Remarkably efficient deprotection of cyclic acetals and ketals. Tetrahedron Lett 1999. [DOI: 10.1016/s0040-4039(99)00013-1] [Citation(s) in RCA: 47] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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149
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Togo H, Hoshina Y, Muraki T, Nakayama H, Yokoyama M. Study on Radical Amidation onto Aromatic Rings with (Diacyloxyiodo)arenes. J Org Chem 1998. [DOI: 10.1021/jo980450y] [Citation(s) in RCA: 104] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hideo Togo
- Graduate School of Science and Technology and Department of Chemistry, Faculty of Science, Chiba University, Inage-ku, Chiba 263-8522 Japan
| | - Yoichiro Hoshina
- Graduate School of Science and Technology and Department of Chemistry, Faculty of Science, Chiba University, Inage-ku, Chiba 263-8522 Japan
| | - Takahito Muraki
- Graduate School of Science and Technology and Department of Chemistry, Faculty of Science, Chiba University, Inage-ku, Chiba 263-8522 Japan
| | - Hiromasa Nakayama
- Graduate School of Science and Technology and Department of Chemistry, Faculty of Science, Chiba University, Inage-ku, Chiba 263-8522 Japan
| | - Masataka Yokoyama
- Graduate School of Science and Technology and Department of Chemistry, Faculty of Science, Chiba University, Inage-ku, Chiba 263-8522 Japan
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150
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Paquette LA, Sun LQ, Friedrich D, Savage PB. Total Synthesis of (+)-Epoxydictymene. Application of Alkoxy-Directed Cyclization to Diterpenoid Construction. J Am Chem Soc 1997. [DOI: 10.1021/ja971526v] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Leo A. Paquette
- Contribution from the Evans Chemical Laboratories, The Ohio State University, Columbus, Ohio 43210
| | - Li-Qiang Sun
- Contribution from the Evans Chemical Laboratories, The Ohio State University, Columbus, Ohio 43210
| | - Dirk Friedrich
- Contribution from the Evans Chemical Laboratories, The Ohio State University, Columbus, Ohio 43210
| | - Paul B. Savage
- Contribution from the Evans Chemical Laboratories, The Ohio State University, Columbus, Ohio 43210
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