51
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Ramanjaneyulu GS, Prabhakar S, Bhaskar G, Vairamani M, Yadav JS, Murty VSR, Soujanya Y, Sastry GN. Differentiation of diastereomeric conduramine derivatives under electron ionization and chemical ionization mass spectral conditions. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2007; 21:579-88. [PMID: 17262898 DOI: 10.1002/rcm.2865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Diastereomeric conduramine derivatives, i.e., (1R,2S,3R/S,6S)-6-(N-carbomethoxyamino) 1,2-O-isopropylidenecyclohex-4-ene-1,2,3-triol (1 and 2) and their O-acetyl derivatives (3 and 4), were studied using gas chromatography (GC) with electron ionization (EI) and chemical ionization (CI). The EI mass spectra of diastereomeric pairs show consistent differences in the relative abundances of characteristic ions. The EI fragmentation patterns are based on precursor/product ion spectra, high-resolution mass spectrometry (HRMS) and deuterium labelling. The CI spectra show differences from the EI spectra, and the isobutane/CI spectra are much simpler than the methane/CI spectra. The differences shown in the CI spectra are similar to those shown in the product ion spectra of [M+H](+) ions generated under electrospray ionization (ESI) conditions. Theoretical calculations are performed to understand the observed differences. The differences in the relative stabilities of molecular ions, or protonated molecules at different sites, can explain the observed differences in the spectra.
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Affiliation(s)
- G S Ramanjaneyulu
- National Centre for Mass Spectrometry, Indian Institute of Chemical Technology, Hyderabad - 500 007, India
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52
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Lectka T, Motherwell W. Tetrahedron reports on organic chemistry. Tetrahedron 2006. [DOI: 10.1016/s0040-4020(06)01801-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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53
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Yardımcı ŞD, Kaya N, Balci M. Regioselectivity in the ene-reaction of singlet oxygen with cyclic alkenes: photooxygenation of methyl-substituted 1,4-cyclohexadiene derivatives. Tetrahedron 2006. [DOI: 10.1016/j.tet.2006.07.103] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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54
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55
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Seçen H, Gültekin S, Sütbeyaz Y, Balci M. Stereospecific Synthesis of Conduramine-F4and Conduritol-F(Leucanthemitol). SYNTHETIC COMMUN 2006. [DOI: 10.1080/00397919408010222] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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56
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Kelebekli L, Çelik M, Şahin E, Kara Y, Balci M. Stereospecific synthesis of a new class of aminocyclitol with the conduramine D-2 configuration. Tetrahedron Lett 2006. [DOI: 10.1016/j.tetlet.2006.07.108] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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57
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Alegret C, Benet-Buchholz J, Riera A. Stereodivergent Syntheses of Conduramines and Aminocyclitols. Org Lett 2006; 8:3069-72. [PMID: 16805554 DOI: 10.1021/ol061022e] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[reaction: see text] The diastereomers of 6-amino-cyclohex-3-ene-1,2-diols 1 (4-deoxy-3-conduramines), key building blocks for the syntheses of a large range of natural products, have been enantioselectively prepared. Diastereoselective dihydroxylation of the compounds provided a new family of aminocyclitols 2 (deoxyinosamines). The key reactions of our syntheses are Sharpless catalytic asymmetric epoxidation, diastereoselective addition of vinylmetal reagents to the aldehydes, and ring-closing metathesis (RCM).
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Affiliation(s)
- Carlos Alegret
- Unitat de Recerca en Síntesi Asimètrica (URSA-PCB), Institut de Recerca Biomédica (IRB), and Departament de Química Orgànica, Universitat de Barcelona, Parc Científic de Barcelona, Spain
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58
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Lectka T, Motherwell W. Tetrahedron reports on organic chemistry. Tetrahedron 2006. [DOI: 10.1016/s0040-4020(06)00771-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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59
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60
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Cerè V, Minzoni M, Pollicino S, Ricci A, Gasparrini F, Ciogli A, D'Acquarica I. A general procedure for the synthesis of stereochemically pure conduritol derivatives practical also for solid-phase chemistry. ACTA ACUST UNITED AC 2006; 8:74-8. [PMID: 16398556 DOI: 10.1021/cc050053i] [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] [Indexed: 11/28/2022]
Abstract
A straightforward synthetic protocol apt to synthesize a library constituted by all conduritol stereoisomers in solution phase is described and successfully applied to some polymer-supported substrates. During the solid-phase sequence, an unprecedented rearrangement of a resin-bound sulfone performed under the Ramberg-Bäcklund conditions appears of particular interest. Upon treatment with Me(3)Si-I, thiepanes supported on resin are found to undergo regio- and stereospecific ring contraction to a six-membered ring system with traceless cleavage from the solid support.
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Affiliation(s)
- Vanda Cerè
- Dipartimento di Chimica Organica "A. Mangini", University of Bologna, Viale Risorgimento 4, I-40136 Bologna, Italy. cere@ ms.fci.unibo.it
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61
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Miyashita K, Imanishi T. Syntheses of Natural Products Having an Epoxyquinone Structure. Chem Rev 2005; 105:4515-36. [PMID: 16351052 DOI: 10.1021/cr040613k] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kazuyuki Miyashita
- Graduate School of Pharmaceutical Sciences, Osaka University, Suita, Japan
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62
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Kelebekli L, Kara Y, Balci M. Stereospecific synthesis of a new class of compounds: bis-homoconduritol-A, -D, and -F. Carbohydr Res 2005; 340:1940-8. [PMID: 16005447 DOI: 10.1016/j.carres.2005.05.021] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2005] [Revised: 04/10/2005] [Accepted: 05/30/2005] [Indexed: 11/16/2022]
Abstract
Bis-homoconduritol derivatives with conduritol-A, -D, and -F structures have been synthesized starting from cyclooctatetraene. The photooxygenation of trans-7,8-dibromo- and cis-7,8-dichlorobicyclo[4.2.0]octa-2,4-dienes afforded the bicyclic endoperoxides. Reduction of the endoperoxides with thiourea followed by acetylation gave the corresponding diacetates. The KMnO(4) oxidation and epoxidation of the diacetates followed by acetylation gave the tetraacetates. Removal of the halides either with zinc-dust or Na-anthracene followed by the ammonolysis of tetraacetates afforded the bis-homoconduritol derivatives in high yield.
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Affiliation(s)
- Latif Kelebekli
- Department of Chemistry, Atatürk University, 25240 Erzurum, Turkey
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63
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Marco-Contelles J, Molina MT, Anjum S. Naturally occurring cyclohexane epoxides: sources, biological activities, and synthesis. Chem Rev 2005; 104:2857-99. [PMID: 15186183 DOI: 10.1021/cr980013j] [Citation(s) in RCA: 205] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- José Marco-Contelles
- Laboratorio de Radicales Libres (IQOG, CSIC), C/Juan de la Cierva, 3, 28006-Madrid, Spain
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64
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Lee YJ, Lee K, Jung SI, Jeon HB, Kim KS. Synthesis of enantiopure cyclitols from (±)-3-bromocyclohexene mediated by intramolecular oxyselenenylation employing (S,S)-hydrobenzoin and (S)-mandelic acid as chiral sources. Tetrahedron 2005. [DOI: 10.1016/j.tet.2005.01.003] [Citation(s) in RCA: 17] [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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65
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66
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Posner PG, Motherwell PW. Tetrahedron reports on organic chemistry. Tetrahedron 2004. [DOI: 10.1016/s0040-4020(04)01396-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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67
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68
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Tetrahedron reports on organic chemistry. Tetrahedron 2004. [DOI: 10.1016/s0040-4020(04)00315-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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69
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Gültekin M, Çelik M, Turkut E, Tanyeli C, Balci M. Resolution of (±)-anti-2,3-dioxabicyclo[2.2.2]oct-7-en-5-ol via Candida cylindracea lipase: synthesis of (−)- and (+)-proto-quercitol. ACTA ACUST UNITED AC 2004. [DOI: 10.1016/j.tetasy.2003.11.037] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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70
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Posner PG, Motherwell PW. Tetrahedron reports on organic chemistry. Tetrahedron 2003. [DOI: 10.1016/s0040-4020(03)01884-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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71
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Posner PG, Motherwell PW. Tetrahedron reports on organic chemistry. Tetrahedron 2003. [DOI: 10.1016/s0040-4020(03)01130-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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72
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Gültekin MS, Salamci E, Balci M. A novel and short synthesis of (1,4/2)-cyclohex-5-ene-triol and its conversion to (+/-)-proto-quercitol. Carbohydr Res 2003; 338:1615-9. [PMID: 12873418 DOI: 10.1016/s0008-6215(03)00256-8] [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: 10/27/2022]
Abstract
(1,4/2)-cyclohex-5-ene-triol was synthesized starting from cyclohexa-1,4-diene with two different approaches. Photooxygenation of cyclohexa-1,4-diene and epoxy-cyclohexene afforded anti-2,3-dioxabicyclo[2.2.2]oct-7-en-5-yl hydroperoxide and anti-7-oxabicyclo[4.1.0]hept-4-en-3-yl hydroperoxide, respectively. Hydroperoxy endoperoxide was reduced with aqueous sodium bisulfite; hydroperoxy-epoxide with dimethylsulfide-titanium tetraisopropoxide to give 7-oxabicyclo[4.1.0]hept-4-en-3-ol. Acidic hydrolysis of the epoxy-alcohol gave the (1,4/2)-cyclohex-3-ene-triol. Oxidation of the double bond with KMnO4 resulted in the formation of (+/-)-proto-quercitol.
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Affiliation(s)
- M Serdar Gültekin
- Department of Chemistry, Faculty of Arts and Sciences, Atatürk University, 25240 Erzurum, Turkey
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73
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Posner PG, Motherwell PW. Tetrahedron reports on organic chemistry. Tetrahedron 2003. [DOI: 10.1016/s0040-4020(03)00841-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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74
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Heo JN, Holson EB, Roush WR. Common-intermediate strategy for synthesis of conduritols and inositols via beta-hydroxy cyclohexenylsilanes. Org Lett 2003; 5:1697-700. [PMID: 12735755 DOI: 10.1021/ol034349d] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[reaction: see text] Syntheses of conduritols B-D and F and d-(+)-chiro- and neo-inositols from cyclohexenylsilane intermediates are described. The key cyclohexylsilane intermediates 5 and 14 were synthesized by stereoselective olefin dihydroxylation of the corresponding cyclohexenylsilanes. Selective Peterson elimination reactions and Fleming-Tamao oxidations of 5 and 14 then delivered the targeted cyclitol derivatives.
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Affiliation(s)
- Jung-Nyoung Heo
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, USA
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75
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Baran A, Kazaz C, Seçen H, Sütbeyaz Y. Synthesis of haloconduritols from an endo-cycloadduct of furan and vinylene carbonate. Tetrahedron 2003. [DOI: 10.1016/s0040-4020(03)00510-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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76
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Tetrahedron reports on organic chemistry. Tetrahedron 2003. [DOI: 10.1016/s0040-4020(03)00323-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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77
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78
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Advances in Chemical Synthesis of Carbasugars and Analogues. ACTA ACUST UNITED AC 2003. [DOI: 10.1016/s1572-5995(03)80013-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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79
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Posner G, Motherwell W. Tetrahedron reports on organic chemistry. Tetrahedron 2002. [DOI: 10.1016/s0040-4020(02)01503-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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80
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Bruno M, Rosselli S, Bondi M, Gedris T, Herz W. Sesquiterpene lactones of Anthemis alpestris. BIOCHEM SYST ECOL 2002. [DOI: 10.1016/s0305-1978(02)00023-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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81
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Takahashi H. [Synthetic studies on sugar-related bioactive substances based on the ring transformation]. YAKUGAKU ZASSHI 2002; 122:755-71. [PMID: 12400157 DOI: 10.1248/yakushi.122.755] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The development of two novel ring conversions of sugar derivatives is described. The first is an efficient conversion of 5-enopyranosides and 6-O-acetyl-5-enopyranosides to the corresponding substituted cyclohexanones mediated by a catalytic amount of palladium dichloride. After a survey of various substrates, the reaction was confirmed to be general and useful. Syntheses of bioactive compounds utilizing this method were therefore investigated. Cyclophellitol, which is a potent beta-glucoidase inhibitor, and its diastereoisomer were efficiently synthesized. Furthermore, novel synthesis of all enantiomerically pure diastereoisomers of inositol starting with 6-O-acetyl-5-enopyranosides was investigated. Good accessibility of these enantiomerically pure inositol diastereoisomers results in the efficient syntheses of D-myo-inositol 1,4,5-trisphosphate and D-myo-inositol 1,3,4,5-tetrakisphosphate. The second investigation involved novel and efficient conversion of D-glycono-1,5-lactones into the corresponding L-sugars. The important intermediate, delta-hydroxyalkoxamate, was provided by a practical alkoxyamination of D-glycono-1,5-lactones mediated by Me3Al. In contrast to the preparation of beta-lactam skeletons from beta-hydroxyalkoxamates, the cyclization of delta-hydroxyalkoxamates under Mitsunobu conditions resulted in O-alkylation rather than N-alkylation. It is noteworthy that delta-hydroxyalkoxamates derived from D-mannono-1,5-lactones afforded the O-alkylation product in 91% yield. No N-alkylation product was detected in this case. These O-cyclized oximes, in which the inversion of the configuration at C5 was secured, were efficiently converted into L-sugars.
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Affiliation(s)
- Hideyo Takahashi
- Faculty of Pharmaceutical Sciences, Teikyo University, Sagamiko, Kanagawa 199-0195.
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82
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Kwon YU, Lee C, Chung SK. Facile syntheses of all possible diastereomers of conduritol and various derivatives of inositol stereoisomers in high enantiopurity from myo-inositol. J Org Chem 2002; 67:3327-38. [PMID: 12003543 DOI: 10.1021/jo016237a] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Phosphoinositide-based signaling processes are crucially important in intracellular signal transduction events. Inositol phosphate analogues have been useful in probing the structure-activity relationships between inositol phosphates and biomacromolecules, and in studying biological functions of newly found inositol phosphates. Thus, a systematic and ready access to inositol stereoisomers is highly desirable. And practical and convenient syntheses of conduritols and related compounds are also important because of their biological activities and their synthetic utilities in the preparation of other bioactive molecules. We herein report the first syntheses of all possible diastereomers of conduritol and various derivatives of eight inositol stereoisomers in high enantiopurity from myo-inositol, which involve efficient enzymatic resolution of the intermediates conduritol B and C derivatives, followed by oxidation-reduction or the Mitsunobu reaction, and cis-dihydroxylation in stereo- and regioselective manners.
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Affiliation(s)
- Yong-Uk Kwon
- Department of Chemistry, Division of Molecular and Life Sciences, Pohang University of Science & Technology, Pohang 790-784, South Korea
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83
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Shimizu H, Okamura H, Yamashita N, Iwagawa T, Nakatani M. Synthesis of (+)-epiepoformin using the base-catalyzed Diels–Alder reaction of 3-hydroxy-2-pyrone. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(01)01871-8] [Citation(s) in RCA: 17] [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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84
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Kwon YU, Chung SK. Facile synthetic routes to all possible enantiomeric pairs of conduritol stereoisomers via efficient enzymatic resolution of conduritol B and C derivatives. Org Lett 2001; 3:3013-6. [PMID: 11554831 DOI: 10.1021/ol0164233] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The first synthesis of all possible enantiomeric pairs of conduritol stereoisomers has been accomplished by efficient enzymatic resolution of conduritol B and C derivatives, followed by oxidation/reduction and the Mitsunobu reaction in stereo- and regioselective manners. Reaction: see text.
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Affiliation(s)
- Y U Kwon
- Department of Chemistry, Division of Molecular and Life Sciences, Pohang University of Science and Technology, Pohang 790-784, South Korea
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85
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Trost BM, Patterson DE, Hembre EJ. AAA in KAT/DYKAT processes: first- and second-generation asymmetric syntheses of (+)- and (-)-cyclophellitol. Chemistry 2001; 7:3768-75. [PMID: 11575778 DOI: 10.1002/1521-3765(20010903)7:17<3768::aid-chem3768>3.0.co;2-c] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Kinetic resolutions and kinetic asymmetric transformations (KAT) as well as dynamic kinetic resolutions and dynamic kinetic asymmetric transformations (DYKAT) are important synthetic protocols. The feasibility of KAT and DYKAT processes for asymmetric allylic alkylations (AAA) is explored utilizing a single substrate--conduritol B tetraesters. Both processes can be performed resulting in excellent enantioselectivity. The impact of nucleophile and leaving group on the effectiveness of each is outlined. The ability to differentiate the various hydroxyl groups is also described. For this purpose, 4-tert-butyldimethylsiloxy-2,2-dimethylbutyric acid was developed as a nucleophile. The utility of effecting KAT/DYKAT processes through the Pd-catalyzed AAA reaction is demonstrated by efficient syntheses of both enantiomers of the potent glycosidase inhibitor cyclophellitol.
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Affiliation(s)
- B M Trost
- Department of Chemistry, Stanford University, CA 94305-5080, USA.
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86
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Marco-Contelles J, Pozuelo C, de Opazo E. Free-radical mediated synthesis of enantiomerically pure, highly functionalized inositols from carbohydrates. Carbohydr Res 2001; 332:341-9. [PMID: 11438091 DOI: 10.1016/s0008-6215(01)00116-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report the synthesis, free-radical cyclization of precursors 1,2,7-trideoxy-7-iodo-3,4:5,6-di-O-isopropylidene-D-gluco-hept-1-enitol (1), methyl 7-O-acetyl-6-O-benzyl-8-bromo-2,3,8-trideoxy-4,5-O-isopropylidene-D-gluco-oct-2-enonate (2) and 5-O-acetyl-4-O-benzyl-6-bromo-6-deoxy-2,3-O-isopropylidene-D-glucose-O-benzyloxime (3), readily prepared from D-glucose, and some selected transformations of the carbocycles obtained from these intermediates. In compound 1 we have installed a terminal double bond and an iodide as radical acceptor and leaving group, respectively. Compounds 2 and 3 are epsilon-bromo aldehydes substituted with alpha,beta-unsaturated ester and oxime ether functions as radical traps, respectively. The tributyltin hydride mediated ring closure of these radical precursors have afforded a series of interesting, diverse and highly functionalized carbocycles which can be considered useful building blocks for the synthesis of branched-chain cyclitols, aminocyclitols and aminoconduritols. In these processes, a good chemical yield and high stereoselectivity has been found in the newly formed stereocenters. Particularly interesting has been the finding that the stereochemical outcome of the free-radical cyclization is independent of the ratio of isomers (E or Z) in oxime ether 3. These results show the power and the state of art of this strategy for the stereocontrolled synthesis of enantiomerically pure inositols from carbohydrates.
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Affiliation(s)
- J Marco-Contelles
- Laboratorio de Radicales Libres, Instituto de Química Organica General (CSIC), C/ Juan de la Cierva 3, E-28006, Madrid, Spain.
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87
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Kadota K, Takeuchi M, Taniguchi T, Ogasawara K. A new convergent route to conduritols A-F from a common chiral building block. Org Lett 2001; 3:1769-72. [PMID: 11405707 DOI: 10.1021/ol015963x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A diastereocontrolled route to conduritols A-F has been developed starting from a common chiral building block containing an oxabicyclo[3.2.1]octane framework.
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Affiliation(s)
- K Kadota
- Pharmaceutical Institute, Tohoku University, Aobayama, Sendai 980-8578, Japan
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88
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89
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Takahashi H, Kittaka H, Ikegami S. Novel synthesis of enantiomerically pure natural inositols and their diastereoisomers. J Org Chem 2001; 66:2705-16. [PMID: 11304191 DOI: 10.1021/jo001575h] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The various inositol polyphosphates have been found to trigger many important biological processes. Although the knowledge of this phosphoinositide signaling system has been discovered in the past 10 years, many factors remain unclear. For this reason, there is an increased demand for supplies of D-myo-inositol and particularly of novel analogues to investigate these biological mechanisms in more detail. Herein, we report the efficient syntheses of all diastereoisomers of inositol starting with 6-O-acetyl-5-enopyranosides. Conversion of 6-O-acetyl-5-enopyranosides into the corresponding substituted cyclohexanones (Ferrier-II rearrangement) was found to proceed efficiently with a catalytic amount of palladium dichloride. Stereoselective reduction of beta-hydroxy ketones obtained provided the precursors to all inositol diastereoisomers in good to excellent yields and with high stereoselectivities. Good accessibility of these enantiomerically pure inositol diastereoisomers results in the efficient syntheses of D-myo-inositol 1,4,5-trisphosphate and D-myo-inositol 1,3,4,5-tetrakisphosphate.
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Affiliation(s)
- H Takahashi
- School of Pharmaceutical Sciences, Teikyo University, Sagamiko, Kanagawa 199-0195, Japan
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90
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Trost BM, Dudash J, Hembre EJ. Asymmetric Induction of Conduritols via AAA Reactions: Synthesis of the Aminocyclohexitol of Hygromycin A. Chemistry 2001; 7:1619-29. [PMID: 11349902 DOI: 10.1002/1521-3765(20010417)7:8<1619::aid-chem16190>3.0.co;2-4] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Two synthetic routes towards the construction of the aminocyclohexitol moiety of hygromycin A have been developed based on palladium-catalyzed asymmetric alkylation of conduritol derivatives. A protocol has been established whereby this biologically relevant molecule is formed from benzoquinone. A conduritol A derivative is synthesized in eight steps from benzoquinone and is then subjected to the palladium reaction. From this flexible intermediate, four epimers of the aminocyclitol, including the natural one, can be obtained with complete stereoselectivity. Racemic conduritol B derivatives are available in four steps from benzoquinone, and these are then made enantiomerically pure by a palladium-catalyzed dynamic kinetic resolution. From the chiral conduritol B, the aminocyclitol is available in six steps. Excellent levels of enantio- and diastereoselectivity highlight these strategies.
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Affiliation(s)
- B M Trost
- Department of Chemistry Stanford University, CA 94305-5080, USA.
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91
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Mehta G, Ramesh SS. Polycyclitols: synthesis of novel carbasugar and conduritol analogues as potential glycosidase inhibitors. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(01)00050-8] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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92
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93
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94
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Hyldtoft L, Madsen R. Carbohydrate Carbocyclization by a Novel Zinc-Mediated Domino Reaction and Ring-Closing Olefin Metathesis. J Am Chem Soc 2000. [DOI: 10.1021/ja001415n] [Citation(s) in RCA: 115] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Lene Hyldtoft
- Contribution from the Department of Organic Chemistry, Technical University of Denmark, DK-2800 Lyngby, Denmark
| | - Robert Madsen
- Contribution from the Department of Organic Chemistry, Technical University of Denmark, DK-2800 Lyngby, Denmark
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95
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Ackermann L, El Tom D, Fürstner A. Ruthenium Carbene Complexes with Imidazol-2-ylidene Ligands: Syntheses of Conduritol Derivatives Reveals Superior RCM Activity. Tetrahedron 2000. [DOI: 10.1016/s0040-4020(99)01102-3] [Citation(s) in RCA: 83] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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96
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Mehta G, Lakshminath S. A norbornyl route to cyclohexitols: stereoselective synthesis of conduritol-E, allo-inositol, MK 7607 and gabosines. Tetrahedron Lett 2000. [DOI: 10.1016/s0040-4039(00)00409-3] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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97
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A norbornyl route to cyclohexitols: structural diversity in fragmentation through functional group switching. Synthesis of α- and β-galactose, α-talose and α-fucopyranose carbasugars. Tetrahedron Lett 2000. [DOI: 10.1016/s0040-4039(00)00408-1] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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98
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Sanfilippo C, Patti A, Nicolosi G. A new resolution of (1α,2β,3α,4β)-2,3-dibromocyclohex-5-en-1,4-diol by lipase from Mucor miehei. ACTA ACUST UNITED AC 2000. [DOI: 10.1016/s0957-4166(00)00038-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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99
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Cerè V, Mantovani G, Peri F, Pollicino S, Ricci A. A General Procedure to Enantiopure Conduritols: Sulfur-Mediated Synthesis of (+)-Conduritol B and (−)-Conduritol F Derivatives and of (−)-Conduritol E and F. Tetrahedron 2000. [DOI: 10.1016/s0040-4020(00)00011-9] [Citation(s) in RCA: 32] [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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100
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Abstract
Synthesis of six inositol stereoisomers was successfully carried out via conduritol intermediates prepared from myo-inositol. Dihydroxylation and epoxidation followed by ring opening of the conduritol B, C and F derivatives gave epi-, allo-, muco-, neo-, DL-chiro- and scyllo-inositol. The cis-inositol derivative, which may not be prepared by this approach, was synthesized in 5 steps via 2-O-benzoyl-myo-inositol orthoformate as the key intermediate.
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Affiliation(s)
- S K Chung
- Department of Chemistry, Pohang University of Science & Technology, Korea
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