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Zhao R, Ismiyarto, Zhou DY, Asano K, Suzuki T, Sasai H, Suzuki T. General Synthesis of meso-1,4-Dialdehydes and Their Application in Ir-Catalyzed Asymmetric Tishchenko Reactions. ACS OMEGA 2024; 9:17945-17955. [PMID: 38680320 PMCID: PMC11044153 DOI: 10.1021/acsomega.3c09381] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Revised: 02/03/2024] [Accepted: 02/09/2024] [Indexed: 05/01/2024]
Abstract
A practical synthesis of meso-1,4-dialdehydes based on the oxidative cleavage of cyclobutanediol derivatives using polymer-supported periodate was developed. The meso-1,4-dialdehydes were obtained in up to >99% yield and subsequently employed in Ir-catalyzed asymmetric Tishchenko reactions to give the corresponding chiral lactones, which are versatile synthetic intermediates, in good yield with moderate enantiomeric excess. The catalytically active species was identified by means of cold-spray ionization mass spectrometry and 1H NMR spectroscopy.
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Affiliation(s)
- Runze Zhao
- Sanken, Osaka
University, 8-1 Mihogaoka, Ibaraki 567-0047, Osaka, Japan
| | | | - Da-Yang Zhou
- Sanken, Osaka
University, 8-1 Mihogaoka, Ibaraki 567-0047, Osaka, Japan
| | - Kaori Asano
- Sanken, Osaka
University, 8-1 Mihogaoka, Ibaraki 567-0047, Osaka, Japan
| | - Takayoshi Suzuki
- Sanken, Osaka
University, 8-1 Mihogaoka, Ibaraki 567-0047, Osaka, Japan
| | - Hiroaki Sasai
- Sanken, Osaka
University, 8-1 Mihogaoka, Ibaraki 567-0047, Osaka, Japan
| | - Takeyuki Suzuki
- Sanken, Osaka
University, 8-1 Mihogaoka, Ibaraki 567-0047, Osaka, Japan
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2
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Bobbitt JM, Eddy NA, Brückner C, Bailey WF, Merbouh N. Bobbitt's Salt-Mediated Oxidation of Alkynyl-ols and -diols to the Corresponding Aldehydes and Their Application in Tandem Reactions. J Org Chem 2023. [PMID: 36812364 DOI: 10.1021/acs.joc.2c02828] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Abstract
Propargyl alcohol derivatives were readily oxidized using Bobbitt's salt to yield the corresponding propynal products. 2-Butyn-1,4-diol may be selectively oxidized to provide either 4-hydroxy-2-butynal or acetylene dicarboxaldehyde, and the resulting stable dichloromethane solutions containing the chemically sensitive acetylene aldehydes were used directly in subsequent Wittig, Grignard, or Diels-Alder reactions. This method provides safe and efficient access to propynals and allows the preparation of polyfunctional acetylene compounds from readily accessible starting material without the use of protecting groups.
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Affiliation(s)
- James M Bobbitt
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269-3060, United States
| | - Nicholas A Eddy
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269-3060, United States
| | - Christian Brückner
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269-3060, United States
| | - William F Bailey
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269-3060, United States
| | - Nabyl Merbouh
- Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
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3
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Detert H, Schollmeyer D. rac-1,1,1,6,6,6-Hexachlorohex-3-yne-2,5-diol hemihydrate. IUCRDATA 2017. [DOI: 10.1107/s2414314617012366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
The asymmetric unit of the title compound, C6H4Cl6O2·0.5H2O, contains one molecule of 1,1,1,6,6,6-hexachlorohex-3-yne-2,5-diol and half a water molecule located on a twofold rotation axis. In the crystal, pairs of hexachlorohexynediol molecules form centrosymmetric dimers connectedviapairwise O—H...O hydrogen bonds. These dimers are connected by water molecules, resulting in layers parallel to theabplane.
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Hayashi D, Igura Y, Masui Y, Onaka M. Stabilization and activation of unstable propynal in the zeolite nanospace and its application to addition reactions. Catal Sci Technol 2017. [DOI: 10.1039/c7cy01161j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Propynal is stabilized in the Na-Y zeolite at ambient temperature and simultaneously activated to form pyrazoles, cinnamaldehydes, and cyclobutenes.
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Affiliation(s)
- Daijiro Hayashi
- Graduate School of Arts and Sciences
- The University of Tokyo
- Tokyo 153-8902
- Japan
| | - Yuta Igura
- Graduate School of Arts and Sciences
- The University of Tokyo
- Tokyo 153-8902
- Japan
| | - Yoichi Masui
- Graduate School of Arts and Sciences
- The University of Tokyo
- Tokyo 153-8902
- Japan
| | - Makoto Onaka
- Graduate School of Arts and Sciences
- The University of Tokyo
- Tokyo 153-8902
- Japan
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Devlin AS, Bois JD. Modular Synthesis of the Pentacyclic Core of Batrachotoxin and Select Batrachotoxin Analogue Designs. Chem Sci 2013; 4:1059-1063. [PMID: 23641312 PMCID: PMC3638728 DOI: 10.1039/c2sc21723f] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Pentacyclic analogues of the potent voltage-gated sodium ion channel agonist batrachotoxin can be accessed through an intermediate furan by exploiting Diels-Alder cycloaddition reactions with ring-strained dienophiles. The use of 3-bromofuran as a 1,2-dianion equivalent, the application of carbamate reductive N-alkylation for homomorpholine ring assembly, and the demonstration of CsF as an effective reagent for generating benzyne, cyclohexyne, and related dienophiles underscore this work.
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Affiliation(s)
- A. Sloan Devlin
- Department of Chemistry, Stanford University, Stanford, CA 94305-5080, USA
| | - J. Du Bois
- Department of Chemistry, Stanford University, Stanford, CA 94305-5080, USA
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6
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Axelrod A, Eliasen AM, Chin MR, Zlotkowski K, Siegel D. Syntheses of Xanthofulvin and Vinaxanthone, Natural Products Enabling Spinal Cord Regeneration. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201205837] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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7
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Axelrod A, Eliasen AM, Chin MR, Zlotkowski K, Siegel D. Syntheses of xanthofulvin and vinaxanthone, natural products enabling spinal cord regeneration. Angew Chem Int Ed Engl 2012; 52:3421-4. [PMID: 23086682 DOI: 10.1002/anie.201205837] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2012] [Revised: 10/03/2012] [Indexed: 11/05/2022]
Affiliation(s)
- Abram Axelrod
- Department of Chemistry and Biochemistry, The University of Texas at Austin, 1 University Station, Austin, TX 78712, USA
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Wang T, Dua S, Bowie JH. How does energized NCCCCCN lose carbon in the gas phase? A joint experimental and theoretical study. J Phys Chem A 2010; 114:949-55. [PMID: 20014806 DOI: 10.1021/jp909911b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Neutral NCCCCCN may be prepared in a collision cell of a VG ZAB 2HF mass spectrometer by charge stripping of (NCCCCCN)(*-), formed in the ion source by the process NCCCCH(OEt)(CN) + HO(-) --> H(2)O + NCCCC(-)(OEt)(CN) --> (NCCCCCN)(*-) + EtO(*). A comparison of the neutralization/reionization ((-)NR(+)) and charge reversal ((-)CR(+)) spectra of (NCCCCCN)(*-) indicate that some neutrals NCCCCCN are energized and rearrange to an isomer which decomposes by loss of carbon. An ab initio study at the CCSD(T)/cc-pVTZ//B3LYP/6-311+G(3df) level of theory indicates that (i) triplet NCCCCCN is the ground state with a T/S energy gap of -14.9 kcal mol(-1); (ii) the structures of triplet and singlet NCCCCCN need to be described by molecular obital theory, and a simple valence bond approach cannot be used for this system; and (iii) there are several possible routes by which an energized neutral may lose carbon, but the major route involves the triplet nitrile to isonitrile rearrangement NCCCCCN --> CNCCCCN --> NCCCCN + C.
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Affiliation(s)
- Tianfang Wang
- Department of Chemistry, The University of Adelaide, South Australia 5005
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10
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Lukyanov SM, Koblik AV, Muradyan LA. Alkynylcarbenium ions and related unsaturated cations. RUSSIAN CHEMICAL REVIEWS 2007. [DOI: 10.1070/rc1998v067n10abeh000410] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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11
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Sequential and tandem oxidation/acetalization procedures for the direct generation of acetals from alcohols. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2007.05.060] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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12
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Albert S, Soret A, Blanco L, Deloisy S. Soluble and polymer-supported 2- and 3-benzylated furans for the preparation of α,β-ethylenic carbonyl compounds. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.01.030] [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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13
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Akué-Gédu R, Hénichart JP, Couturier D, Rigo B. Synthesis of 2-pyrone-4-carboxaldehydes from acetylene dicarboxaldehyde monoacetal. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2004.10.081] [Citation(s) in RCA: 15] [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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14
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Gorgues A, Hudhomme P, Sallé M. Highly Functionalized Tetrathiafulvalenes: Riding along the Synthetic Trail from Electrophilic Alkynes. Chem Rev 2004; 104:5151-84. [PMID: 15535646 DOI: 10.1021/cr0306485] [Citation(s) in RCA: 152] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Alain Gorgues
- Laboratoire de Chimie, Ingénierie Moléculaire et Matériaux d'Angers, UMR CNRS 6200, 2 Boulevard Lavoisier, Université d'Angers, F-49045 Angers, France.
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Lee KY, Lee MJ, GowriSankar S, Kim JN. Convenient synthesis of arylpropargyl aldehydes and 4-aryl-3-butyn-2-ones from arylacetylenes and amide acetals. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2004.04.193] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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16
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Akué-Gédu R, Rigo B. Large scale synthesis of acetylene dicarboxaldehyde mono and diacetal. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2004.01.022] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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17
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Berridge R, Serebryakov IM, Skabara PJ, Ortí E, Viruela R, Pou-Amérigo R, Coles SJ, Hursthouse MB. A new series of π-extended tetrathiafulvalene derivatives incorporating fused furanodithiino and thienodithiino units: a joint experimental and theoretical study. ACTA ACUST UNITED AC 2004. [DOI: 10.1039/b404545a] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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18
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Ciochina R, Grossman RB. A New Synthetic Approach to the Polycyclic Polyprenylated Acylphloroglucinols. Org Lett 2003; 5:4619-21. [PMID: 14627398 DOI: 10.1021/ol0357907] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[reaction: see text] The three-carbon alpha,alpha'-annulation of a sterically hindered cyclic beta-keto ester can be achieved by alkynylation with 3,3-diethoxypropyne, syn reduction of the alkyne with Co(2)(CO)(8) and Et(3)SiH, and an intramolecular aldol reaction. The method is potentially useful for the synthesis of nemorosone, hyperforin, and other polycyclic polyprenylated acylphloroglucinols.
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Affiliation(s)
- Roxana Ciochina
- Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506-0055, USA
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19
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Avalos M, Babiano R, Cabello N, Cintas P, Hursthouse MB, Jiménez JL, Light ME, Palacios JC. Thermal and sonochemical studies on the Diels-Alder cycloadditions of masked o-benzoquinones with furans: new insights into the reaction mechanism. J Org Chem 2003; 68:7193-203. [PMID: 12968868 DOI: 10.1021/jo0348322] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
What does a Diels-Alder cycloaddition look like? This question is here addressed in the case of the increasingly significant cycloadditions of masked o-benzoquinones (MOBs), which serve as versatile dienes for the construction of complex and functionalized structures. So first, what the mechanism is not: It is not (by and large) a classical, concerted [4 + 2] cycloaddition. Experimental evidence is now supported by sonochemical studies, which were instrumental in elucidating the pathway. Reactions with furans are accelerated and improved under sonication, even when conducted at -10 degrees C. Variation of the acoustic energy, temperature, and solvent composition allows us to optimize the yields and provide insights into the mechanism. Ultrasound does not cause sonochemical switching, as an alternative radical pathway should be ruled out. Results are consistent with a polar mechanism as claimed recently in a theoretical study. Moreover, this also does justice to a series of seminal papers, largely ignored, that gave a clue to the crucial issue of furan regioselectivity based on a nucleophilic addition. Most effects caused by ultrasonic agitation are of mechanochemical nature and suggest the existence of a perfectly stirred reactor with enhanced mass transfer.
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Affiliation(s)
- Martín Avalos
- Departamento de Química Orgánica, Facultad de Ciencias, University of Extremadura, E-06071 Badajoz, Spain
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Frère P, Gallego-Planas N, Blanchard P, Mabon G, Rondeau D. Access to 3,4-furan dithiolate: towards 3,4-dialkylsulfanylfurans and their Diels–Alder adducts with acrylonitrile. Tetrahedron Lett 2002. [DOI: 10.1016/s0040-4039(02)00126-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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21
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Skabara PJ, Serebryakov IM, Perepichka IF, Sariciftci NS, Neugebauer H, Cravino A. Toward Controlled Donor−Acceptor Interactions in Noncomposite Polymeric Materials: Synthesis and Characterization of a Novel Polythiophene Incorporating π-Conjugated 1,3-Dithiole-2-ylidenefluorene Units as Strong D−A Components. Macromolecules 2001. [DOI: 10.1021/ma0015931] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | | | - Igor F. Perepichka
- L. M. Litvinenko Institute of Physical Organic and Coal Chemistry, National Academy of Sciences of Ukraine, Donetsk 83114, Ukraine
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22
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Ramanaiah KCV, Stevens ED, Trudell ML, Pagoria PF. Synthesis of 1-substituted [1,2,3]triazolo[4,5-d]pyridazines as precursors for novel tetraazapentalene derivatives. J Heterocycl Chem 2000. [DOI: 10.1002/jhet.5570370631] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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23
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Vogel P, Cossy J, Plumet J, Arjona O. Derivatives of 7-oxabicyclo[2.2.1]heptane in nature and as useful synthetic intermediates. Tetrahedron 1999. [DOI: 10.1016/s0040-4020(99)00845-5] [Citation(s) in RCA: 101] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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24
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Butin AV, Stroganova TA, Kul'nevich VG. Furyl(aryl)methanes and their analogs. (Review). Chem Heterocycl Compd (N Y) 1999. [DOI: 10.1007/bf02252099] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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25
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Kobayashi T, Sugawara H, Nikaeen B. Norbornadiene-Fused Heterocycles: Synthesis of 5,8-Dihydro-5,8-methanophthalazines and Regioselective Ring Cleavage and Skeletal Rearrangement of 6,7-Epoxy-5,6,7,8-tetrahydro-5,8-methanophthalazine 2-Oxides in Trifluoroacetic Acid. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1998. [DOI: 10.1246/bcsj.71.497] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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26
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Tobe Y, Kubota K, Naemura K. Diels−Alder Reactions of Tetraethynylcyclopentadienones. An Approach to Differentially Substituted Hexaethynylbenzenes ofC2vSymmetry. J Org Chem 1997. [DOI: 10.1021/jo970309+] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Mikami K, Yoshida A, Matsumoto Y. Catalytic asymmetric carbonyl-ene reactions with alkynylogous and vinylogous glyoxylates: Application to controlled synthesis of chiral isocarbacyclin analogues. Tetrahedron Lett 1996. [DOI: 10.1016/0040-4039(96)01954-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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29
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Magnus P, Carter R, Davies M, Elliott J, Pitterna T. Studies on the synthesis of the core structures of the antitumor agents neocarzinostatin, kedarcidin, C-1027 and maduropeptin. Tetrahedron 1996. [DOI: 10.1016/0040-4020(96)00283-9] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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30
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Kobayashi T, Suda H, Takase H, Iriye R, Kato H. Norbornadiene-Fused Heterocycles: Syntheses and Cycloaddition Reactions of 2-Aryl-4,7-dihydro-4,7-methano-2H-isoindoles and 4,7-Dihydro-4,7-methanoisobenzofuran. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1995. [DOI: 10.1246/bcsj.68.3269] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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31
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Leriche P, Gorgues A, Jubault M, Becher J, Orduna J, Garin J. Cycloaddition of acetylenedicarbaldehyde monoacetal and 2,4,5-trithioxo-1,3-dithiole: Ready access to novel highly extended and sulfur-rich analogues of tetrathiafulvalene (TTF). Tetrahedron Lett 1995. [DOI: 10.1016/0040-4039(95)00014-4] [Citation(s) in RCA: 14] [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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32
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Gorgues A, Jubault M, Belyasmine A, Salle M, Frere P, Morisson V, Gouriou Y. New Derivatives of Tetrathiafulvalenes (TTF): Towards Organic Metals of Enhanced Dimensionality. PHOSPHORUS SULFUR 1994. [DOI: 10.1080/10426509408034210] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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33
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Cycloaddition of 3-thioxo-12-dithioles onto acetylenedicarbaldehyde and its mono-diethylacetal : Ready access to intermediates in the tetrathiafulvalene (TTF) series. Tetrahedron Lett 1993. [DOI: 10.1016/0040-4039(93)88074-s] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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34
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Belyasmine A, Frère P, Gorgues A, Jubault M, Duguay G, Hudhomme P. Vinylogs of tetrathiafulvalene (TTF) bearing four 1,4-dithiafulven-6-yl substituents : Novel highly extended and sulfur-rich π-donors. Tetrahedron Lett 1993. [DOI: 10.1016/s0040-4039(00)60601-9] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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35
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Acid mediated intramolecular cyclization of π-donors bearing two vicinal “cis”-branched, 1,4-dithiafulven-6-yl substituents on a CC bond. Tetrahedron Lett 1993. [DOI: 10.1016/s0040-4039(00)60363-5] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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36
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Badri M, Caminade AM, Majoral JP, Gorgues A. ATTEMPTED SYNTHESIS OF PHOSPHORUS CRYPTANDS. PHOSPHORUS SULFUR 1991. [DOI: 10.1080/10426509108038074] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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37
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Chemo-enzymatic synthesis of 1,2- and 1,3- amino-alcohols and their use in the enantioselective reduction of acetophenone and anti-acetophenone oxime methyl ether with borane. Tetrahedron 1991. [DOI: 10.1016/s0040-4020(01)80959-5] [Citation(s) in RCA: 65] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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38
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Magnus P, Pitterna T. Synthesis of the neocarzinostatin chromophore A core diynene structure using an η2-hexacarbonyidicobalt mediated Aldol reaction. ACTA ACUST UNITED AC 1991. [DOI: 10.1039/c39910000541] [Citation(s) in RCA: 52] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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39
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40
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Gorgues A, Stephan D, Belyasmine A. Khanous A, Le. Co A. Acetylenedicarbaldehyde: isolement et dienophilie exclusive en milieu neutre. Tetrahedron 1990. [DOI: 10.1016/s0040-4020(01)88374-5] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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41
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Alt HG, Engelhardt HE, Rogers RD, Abu-Orabi ST. Photoinduzierte umsetzungen der komplexe (η6-C6H3R3)(CO)3Cr (R = Me, Et) mit den acetylenen C2R2′ (R′ = H, C3H7, C(OEt)2H). Die molekülstruktur von (C6H3Me3)(CO)Cr(μ-CO)“;μ-C2[C(OEt)2H]2”;Cr(CO)4. J Organomet Chem 1989. [DOI: 10.1016/0022-328x(89)85003-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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