76
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Chiaroni A, Riche C, Bouifraden S, Lavergne JP, Viallefont P. (3 R,2' S)-2'- N-Dibenzylamino-1,2:5,6-di- O-isopropylidène-α- D-allofuranose-3-spiro-3'-β-propiolactone. Acta Crystallogr C 1997. [DOI: 10.1107/s0108270196014461] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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77
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Poujol H, Ahond A, Al Mourabit A, Chiaroni A, Poupat C, Riche C, Potier P. Taxoïdes: Nouveaux analogues du 7-déshydroxydocétaxel préparés à partir des alcaloïdes de l'If. Tetrahedron 1997. [DOI: 10.1016/s0040-4020(97)00180-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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78
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Sasaki NA, Dockner M, Chiaroni A, Riche C, Potier P. A Novel Stereodivergent Synthesis of Optically Pure cis- and trans-3-Substituted Proline Derivatives. J Org Chem 1997; 62:765-770. [PMID: 11671483 DOI: 10.1021/jo961790r] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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79
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Wong YS, Marazano C, Gnecco D, Génisson Y, Chiaroni A, Das BC. Pyridine-Derived Oxazolidines as Chiral 3-Alkyl-4,5-dihydropyridinium and 3-Alkyl-3,4,5,6-tetrahydropyridinium Salt Equivalents. J Org Chem 1997; 62:729-733. [PMID: 11671472 DOI: 10.1021/jo961323+] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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80
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Vergne F, Aitken DJ, Husson HP, Chiaroni A, Riche C. Rapid Synthesis of (±)-(E)- and (±)-(Z)-1-Amino-1-aminomethyl-2-(hydroxymethyl)cy clopropanes, Preparation of their Dichloroplatinum(II) Complexes, and Crystal Structure of a Derivative of the (±)-(E) Isomer. JOURNAL OF CHEMICAL RESEARCH 1997. [DOI: 10.1039/a606840e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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81
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Chiaroni A, Riche C, Lassaba E, Benharref A. 2α,3α:7α,8α-Diépoxy-cis-himachalane. Acta Crystallogr C 1996. [DOI: 10.1107/s0108270196008797] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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82
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Chiaroni A, Riche C, Benharref A, Lassaba E, Baouid A. 2α,3α:6α,7α-Diépoxyhimachalane. Acta Crystallogr C 1996. [DOI: 10.1107/s0108270196005756] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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83
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Chiaroni A, Riche C, Benharref A, El Jamili H, Lassaba E. 2α,3α:7β,8β-Diépoxy-trans-himachalane. Acta Crystallogr C 1996. [DOI: 10.1107/s0108270196005768] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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84
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Sageot O, Monteux D, Langlois Y, Riche C, Chiaroni A. Preparation and use of chiral (Z)-enol ethers in asymmetric bradsher cycloaddition. Tetrahedron Lett 1996. [DOI: 10.1016/0040-4039(96)01540-7] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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85
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Cavé C, Desmaële D, d'Angelo J, Riche C, Chiaroni A. Stereochemical Aspects in the Asymmetric Michael Addition of Chiral Imines to Substituted Electrophilic Alkenes. J Org Chem 1996; 61:4361-4368. [PMID: 11667338 DOI: 10.1021/jo960140k] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The Michael-type addition of chiral imines, derived from racemic alpha-substituted cyclanones and optically active 1-phenylethylamine, to electrophilic alkenes, in neutral conditions, constitutes one of the most efficient methods for the stereocontrolled construction of quaternary carbon centers. In order to create an additional stereogenic center at the alpha- or beta-position to the quaternary one, the behavior of a variety of alpha- and beta-substituted alkenyl acceptors was examined. In general, these additions are highly regioselective, the alkylation taking place predominantly, if not exclusively, at the more substituted alpha-side of the imine function; however, in some cases (electrophilic alkenes 28 and 49), significant amounts (10-15%) of regioisomeric adducts were obtained. With the exception of methyl propiolate 52, a remarkable control of the absolute configuration of the adducts were always observed with these Michael acceptors. According to the general rule we have previously proposed, the alkylation process takes place preferentially on the less hindered pi-face of the more substituted secondary enamine, in tautomeric equilibrium with the starting imine. An excellent diastereocontrol was always obtained by using the present alpha- and beta-substituted alkenes. These stereochemical outcomes can be interpreted by invoking that the reaction proceeds through a compact approach of the reactants, the hydrogen atom at the nitrogen center of the enamine being transferred to the alpha-vinylic carbon atom of the acceptor, concertedly with the creation of the C-C bond. In this respect the "endo-approach" 58, in which the electron-withdrawing group of the acceptor faced to the nitrogen atom of the enamine (case of acceptors 10, methyl methacrylate, 24, 28, 43, 47, and 49) largely prevails over the "exo-approach" 59 (case of acceptor 38). This predominant "endo-preference" can be reasonably interpreted in terms of a cooperative effect between steric and stereoelectronic factors.
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86
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Dumontet V, Thoison O, Omobuwajo OR, Martin MT, Perromat G, Chiaroni A, Riche C, Païs M, Sévenet T, Hamid A. Hadi A. New nitrogenous and aromatic derivatives from Aglaia argentea and A. forbesii. Tetrahedron 1996. [DOI: 10.1016/0040-4020(96)00322-5] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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87
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Dumas F, Mezrhab B, d'Angelo J, Riche C, Chiaroni A. Investigating the π-Facial Discrimination Phenomenon in the Conjugate Addition of Amines to Chiral Crotonates: A Convenient Basis for the Rational Design of Chiral Auxiliaries. J Org Chem 1996. [DOI: 10.1021/jo951414r] [Citation(s) in RCA: 65] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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88
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Dauban P, Chiaroni A, Riche C, Dodd RH. Synthesis of Optically Pure 3,4-Disubstituted l-Glutamates from a Novel 2,3-Aziridino-γ-lactone 4-Carboxylate Derivative. J Org Chem 1996. [DOI: 10.1021/jo951983z] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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89
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Langlois N, Dahuron N, Chiaroni A, Riche C. Tandem Stereoselective Conjugate Additions to a,b-Unsaturated Oxazolines. HETEROCYCLES 1996. [DOI: 10.3987/com-95-s59] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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90
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Urban D, Skrydstrup T, Riche C, Chiaroni A, Beau JM. Stereocontrolled synthesis of α-C-galactosamine derivatives promoted by samarium diiodide: an example of chelation controlled C-glycosylation. Chem Commun (Camb) 1996. [DOI: 10.1039/cc9960001883] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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91
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Chiaroni A, Riche C, Marder R, Dubois J, Guénard D, Guéritte-Voegelein F. A 10-Deacetylbaccatin III Derivative: 11,12-Dihydro-7-triethylsilyl-10-deacetylbaccatin III. Acta Crystallogr C 1995. [DOI: 10.1107/s0108270195004616] [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] Open
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92
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Chiaroni A, Hanquet G, Lusinchi M, Riche C. First X-ray Determination of an Oxaziridinium Salt: (1S,2R,3R,4S)-2,3-Dimethyl-4-phenyl-1,2,3,4-tetrahydro-1,2-epoxyisoquinolinium Tetrafluoroborate and (1S,2R,3R,4S)-3-Methyl-4-phenyl-1,2,3,4-tetrahydro-2,3-epoxyisoquinoline. Acta Crystallogr C 1995. [DOI: 10.1107/s0108270195004604] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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93
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Chiaroni A, Riche C, Baouid A, Benharref A, Hasnaoui A, Lavergne JP. 1-Mésityl-3a-méthyl-5-phényl-3a,4-dihydro[1,2,4]oxadiazolo[4,5-a][1,5]benzodiazépine. Acta Crystallogr C 1995. [DOI: 10.1107/s0108270194010358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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94
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Chiaroni A, Riche C, Nicole L. (2R,3S,4S)-3-Hydroxy-4-methyl-1-[(1S)-1-phenylethyl]pyrrolidine-2-methanol. Acta Crystallogr C 1995. [DOI: 10.1107/s0108270194015027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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95
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Chiaroni A, Riche C, Baouid A, Hasnaoui A, Benharref A, Lavergne JP. 1,7-Bis(éthoxycarbonyl)-3a-méthyl-4a-phényl-3,5-bis(p-nitrophényl)-3a,4,4a,5-tétrahydro-3H-bis-[1,2,4]triazolo[4,3-a:3',4'-d][1,5]benzodiazépine, C36H32N8O8.CHCl3. Acta Crystallogr C 1995. [DOI: 10.1107/s0108270194014113] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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96
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Chiaroni A, Riche C, Adonias M, Anaya J, Géro SD, Tachdjian C. Two Methyl-Substituted Carbapenem Antibiotic Precursors. Acta Crystallogr C 1995. [DOI: 10.1107/s0108270194014423] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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97
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Chiaroni A, Riche C, Benharref A, El Jamili H, Lassaba E. 2α,3α:7β,13β-Diépoxy-trans-himachalane. Acta Crystallogr C 1995. [DOI: 10.1107/s0108270194014125] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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98
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Chiaroni A, Riche C, Baouid A, Benharref A, Hasnaoui A, Lavergne JP. Ethyl 3-(4-Chlorophényl)-3a-méthyl-5-phényl-3,3a,4,11-tétrahydro-3H-[1,2,4]triazolo[4,3-a][1,5]benzodiazépine-1-carboxylate, C26H23ClN4O2. Acta Crystallogr C 1995. [DOI: 10.1107/s0108270194011418] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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99
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Chiaroni A, Riche C, Dumas F, Potin D, d'Angelo J. (±)-3-Methyl-1,1-diphenyl-2-butyl 3-Acetamidocrotonate and its Hydrogenation Product. Acta Crystallogr C 1995. [DOI: 10.1107/s0108270193007383] [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] Open
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100
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Sagnard I, Sasaki N, Chiaroni A, Riche C, Potier P. Enantioselective synthesis of cyclopropane α-amino acids: Synthesis of N-Boc-cis-(2S,3R,4S)-3,4-methanoproline and N-Boc-(2S,3R,4S)-3,4-methanoglutamic acid. Tetrahedron Lett 1995. [DOI: 10.1016/0040-4039(95)00482-r] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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