1
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Moeng MM, Malan FP, Lotz S, Bezuidenhout DI. Fischer carbene complexes of cobalt(I): Synthesis and structure. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2021.132093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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2
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Kanchana US, Diana EJ, Mathew TV, Anilkumar G. Palladium‐ Catalyzed C−P Bond Forming Reactions: An Overview. ChemistrySelect 2021. [DOI: 10.1002/slct.202004433] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- U. S. Kanchana
- Department of Chemistry St. Thomas College Pala, Arunapuram Kottayam, Kerala P.O. 686574 India
| | - Elizabeth J. Diana
- Department of Chemistry St. Thomas College Pala, Arunapuram Kottayam, Kerala P.O. 686574 India
| | - Thomas V. Mathew
- Department of Chemistry St. Thomas College Pala, Arunapuram Kottayam, Kerala P.O. 686574 India
| | - Gopinathan Anilkumar
- School of Chemical Sciences Mahatma Gandhi University, P D Hills PO, Kottayam Kerala 686560 India
- Advanced Molecular Materials Research Centre (AMMRC) Mahatma Gandhi University, Priyadarshini Hills P O Kottayam Kerala 686560 India
- Institute for Integrated programmes and Research in Basic Sciences (IIRBS) Mahatma Gandhi University, Priyadarshini Hills P O Kottayam Kerala 686560 India
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3
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Gnawali GR, Rath NP, Spilling CD. Synthesis of Phostones via the Palladium-Catalyzed Ring Opening of Epoxy Vinyl Phosphonates. J Org Chem 2019; 84:8724-8730. [PMID: 31140269 DOI: 10.1021/acs.joc.9b00905] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The reaction of epoxy aldehydes with tetraethyl methylenediphosphonate gave γ,δ-epoxy vinyl phosphonates. The palladium-catalyzed addition of primary alcohols gave the monoprotected diols as single diastereoisomers. The trans- and cis-epoxides lead to opposite ( syn and anti) diastereoisomers of the addition products. The alkene of the vinyl phosphonates was subjected to hydrogenation, and the resulting saturated phosphonates underwent base-catalyzed cyclization to give phostones with a very high diastereoselectivity in the formation of the new chiral center at the phosphorus atom.
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Affiliation(s)
- Giri Raj Gnawali
- Department of Chemistry and Biochemistry , University of Missouri, St. Louis , One University Boulevard , St. Louis , Missouri 63121 , United States
| | - Nigam P Rath
- Department of Chemistry and Biochemistry , University of Missouri, St. Louis , One University Boulevard , St. Louis , Missouri 63121 , United States
| | - Christopher D Spilling
- Department of Chemistry and Biochemistry , University of Missouri, St. Louis , One University Boulevard , St. Louis , Missouri 63121 , United States
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4
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Synthesis and Antifungal Activity of β-Hydroxysulfides of 1,3-Dioxepane Series. J CHEM-NY 2018. [DOI: 10.1155/2018/3589342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Synthesis of β-hydroxysulfides of 1,3-dioxepane series and their further functionalization were performed. Chiral β-hydroxysulfides were separated into enantiomers using enzymatic acylation by lipase PS. Study of antifungal activity of the obtained compounds showed that some enantiomerically pure 6-arylthio-1,3-dioxepan-5-ols represent promising antifungal drug candidates.
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5
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Kaczmarek P, Rapp M, Koroniak H. Pyrrolidine and oxazolidine ring transformations in proline and serine derivatives of α-hydroxyphosphonates induced by deoxyfluorinating reagents. RSC Adv 2018; 8:24444-24457. [PMID: 35539185 PMCID: PMC9082089 DOI: 10.1039/c8ra05186k] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2018] [Accepted: 06/30/2018] [Indexed: 11/21/2022] Open
Abstract
Transformations of α-hydroxyphosphonates derived from proline or serine by treatment with different deoxyfluorinating reagents (DAST, Deoxofluor, PyFluor) are reported. Depending on the applied reagent, as well as the protecting group used (N-Cbz, N-Boc, N-Bn) different types of products are observed. The reaction of N-Cbz or N-Boc prolinols with DAST or Deoxofluor due to aziridinium intermediate participation gave fluorinated amino phosphonates such as piperidine and pyrrolidine derivatives and/or oxazolidine-2-ones. Similarly, the analogous reaction of N-Cbz or N-Boc protected serinol yielded oxazolidine-2-ones or its fluorinated analogues. As the second type of product formed by DAST-induced reaction of serine derivatives, aziridines were obtained. Only in the case of deoxyfluorination of N-benzyl prolinols were both diastereoisomers of β-fluoropiperidine-α-phosphonates formed, while the reaction of protected N-benzyl serinols gave fluorinated oxazolidines. Moreover, application of PyFluor gave sulfonate derivatives. Diastereoselective reactions of hydroxyphosphonates from proline or serine with fluorinating agents yielding piperidine-, oxazolidine-, aziridine- or sulfonate phosphonates were reported.![]()
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Affiliation(s)
- Patrycja Kaczmarek
- Faculty of Chemistry, Adam Mickiewicz University in Poznań Umultowska 89b 61-614 Poznań Poland
| | - Magdalena Rapp
- Faculty of Chemistry, Adam Mickiewicz University in Poznań Umultowska 89b 61-614 Poznań Poland
| | - Henryk Koroniak
- Faculty of Chemistry, Adam Mickiewicz University in Poznań Umultowska 89b 61-614 Poznań Poland
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6
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Kondoh A, Kamata Y, Terada M. Synthesis of Enantioenriched γ-Amino-α,β-unsaturated Esters Utilizing Palladium-Catalyzed Rearrangement of Allylic Carbamates for Direct Application to Formal [3 + 2] Cycloaddition. Org Lett 2017; 19:1682-1685. [DOI: 10.1021/acs.orglett.7b00471] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Azusa Kondoh
- Research and Analytical Center for Giant Molecules, Graduate School
of Science and ‡Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
| | - Yuji Kamata
- Research and Analytical Center for Giant Molecules, Graduate School
of Science and ‡Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
| | - Masahiro Terada
- Research and Analytical Center for Giant Molecules, Graduate School
of Science and ‡Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
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7
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Hamper BC, Mannino MP, Mueller ME, Harrison LT, Spilling CD. Enantioseparation of α-Hydroxyallylphosphonates and Phosphonoallylic Carbonate Derivatives on Chiral Stationary Phases Using Sequential UV, Polarimetric, and Refractive Index Detection. Chirality 2016; 28:656-62. [DOI: 10.1002/chir.22627] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2016] [Revised: 07/07/2016] [Accepted: 07/11/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Bruce C. Hamper
- Department of Chemistry and Biochemistry; University of Missouri-St. Louis, St. Louis; Missouri USA
| | - Michael P. Mannino
- Department of Chemistry and Biochemistry; University of Missouri-St. Louis, St. Louis; Missouri USA
| | - Melissa E. Mueller
- Department of Chemistry and Biochemistry; University of Missouri-St. Louis, St. Louis; Missouri USA
| | - Liam T. Harrison
- Department of Chemistry and Biochemistry; University of Missouri-St. Louis, St. Louis; Missouri USA
| | - Christopher D. Spilling
- Department of Chemistry and Biochemistry; University of Missouri-St. Louis, St. Louis; Missouri USA
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8
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El Mamouni EH, Cattoen M, Cordier M, Cossy J, Arseniyadis S, Ilitki H, El Kaïm L. Selective Tsuji–Trost type C-allylation of hydrazones: a straightforward entry into 4,5-dihydropyrazoles. Chem Commun (Camb) 2016; 52:14490-14493. [DOI: 10.1039/c6cc08171a] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Tsuji–Trost type C-allylation access to 4,5-dihydropyrazoles.
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Affiliation(s)
- El Hachemia El Mamouni
- Laboratoire de Synthèse Organique
- CNRS
- Ecole Polytechnique
- ENSTA ParisTech-UMR 7652
- Université Paris-Saclay
| | - Martin Cattoen
- Queen Mary University of London
- School of Biological and Chemical Sciences
- London
- UK
| | - Marie Cordier
- Laboratoire de Chimie Moléculaire
- UMR 9168
- Department of Chemistry
- Ecole Polytechnique
- CNRS
| | - Janine Cossy
- Laboratoire de Chimie Organique
- Institute of Chemistry
- Biology and Innovation (CBI)-ESPCI Paris/CNRS (UMR8231)/PSL Research University
- 75231 Paris Cedex 05
- France
| | - Stellios Arseniyadis
- Laboratoire de Chimie Organique
- Institute of Chemistry
- Biology and Innovation (CBI)-ESPCI Paris/CNRS (UMR8231)/PSL Research University
- 75231 Paris Cedex 05
- France
| | - Hocine Ilitki
- Laboratory of the Chemistry and Electrochemistry of the Metallic Complexes
- Department of Chemistry
- Faculty of Sciences
- University of Sciences and Technology of Oran Mohamed Boudiaf (U.S.T.O.M.B.)
- Algeria
| | - Laurent El Kaïm
- Laboratoire de Synthèse Organique
- CNRS
- Ecole Polytechnique
- ENSTA ParisTech-UMR 7652
- Université Paris-Saclay
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9
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Zhao Y, Chen T, Han D, Zhao CQ, Han LB. Facile base-mediated redox transformation: an efficient strategy for the synthesis of α-acyloxyphosphoryl compounds. Org Lett 2014; 16:6152-5. [PMID: 25398049 DOI: 10.1021/ol503014f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An efficient one-pot synthesis of α-acyloxyphosphoryl compounds from aldehydes and hydrogen phosphoryl compounds has been developed using a facile base-mediated redox strategy. This redox transformation is applicable to synthesize a wide range of valuable α-acyloxyphosphoryl compounds with high atom- and step-economic efficiency.
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Affiliation(s)
- Yalei Zhao
- †State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
| | - Tieqiao Chen
- †State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
| | - Daoqing Han
- §National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8565, Japan
| | - Chang-Qiu Zhao
- ‡College of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, Shandong 252059, China
| | - Li-Biao Han
- †State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China.,§National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8565, Japan
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10
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Malla RK, Ridenour JN, Spilling CD. Relay cross metathesis reactions of vinylphosphonates. Beilstein J Org Chem 2014; 10:1933-41. [PMID: 25246952 PMCID: PMC4168886 DOI: 10.3762/bjoc.10.201] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2014] [Accepted: 07/14/2014] [Indexed: 11/23/2022] Open
Abstract
Dimethyl (β-substituted) vinylphosphonates do not readily undergo cross metathesis reactions with Grubbs catalyst and terminal alkenes. However, the corresponding mono- or diallyl vinylphosphonate esters undergo facile cross metathesis reactions. The improved reactivity is attributed to a relay step in the cross metathesis reaction mechanism.
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Affiliation(s)
- Raj K Malla
- Department of Chemistry and Biochemistry, University of Missouri St. Louis, One University Boulevard, St. Louis, MO 63121, USA
| | - Jeremy N Ridenour
- Department of Chemistry and Biochemistry, University of Missouri St. Louis, One University Boulevard, St. Louis, MO 63121, USA
| | - Christopher D Spilling
- Department of Chemistry and Biochemistry, University of Missouri St. Louis, One University Boulevard, St. Louis, MO 63121, USA
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11
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Bauer JM, Frey W, Peters R. Asymmetrische Kaskadenreaktion zu Allylsulfonamiden aus Allylalkoholen über eine Palladium(II)/Base-katalysierte Umlagerung von Allylcarbamaten. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201403090] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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12
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Bauer JM, Frey W, Peters R. Asymmetric Cascade Reaction to Allylic Sulfonamides from Allylic Alcohols by Palladium(II)/Base-Catalyzed Rearrangement of Allylic Carbamates. Angew Chem Int Ed Engl 2014; 53:7634-8. [DOI: 10.1002/anie.201403090] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2014] [Indexed: 11/11/2022]
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13
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Spilling CD, Malla RK. Synthesis of non-racemic α-hydroxyphosphonates via asymmetric phospho-aldol reaction. Top Curr Chem (Cham) 2014; 361:83-136. [PMID: 25467537 DOI: 10.1007/128_2014_583] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
It has been more than 50 years since the first phospho-aldol reactions of dialkyl phosphites were reported. These efficient P-C bond-forming reactions have become the cornerstone of methods for the synthesis of α-hydroxyphosphonates and, by numerous available substitution reactions, the synthesis of other α- and γ-substituted phosphonates and phosphonic acids. Much of the interest in α- and γ-substituted phosphonates and phosphonic acids has been stimulated by reports of their biological activity, which is often dependent upon their absolute and relative stereochemistry. In this chapter, we review diastereoselective and enantioselective additions of dialkyl phosphites to aldehydes and ketones, otherwise called the phospho-aldol, Pudovik or Abramov reactions.
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Affiliation(s)
- Christopher D Spilling
- Department of Chemistry and Biochemistry, University of Missouri-St. Louis, One University Boulevard, St. Louis, MO, 63121, USA,
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14
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Regalado EL, Kozlowski MC, Curto JM, Ritter T, Campbell MG, Mazzotti AR, Hamper BC, Spilling CD, Mannino MP, Wan L, Yu JQ, Liu J, Welch CJ. Support of academic synthetic chemistry using separation technologies from the pharmaceutical industry. Org Biomol Chem 2014; 12:2161-6. [DOI: 10.1039/c3ob42195c] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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15
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BERA KALISANKAR, NADKARNI DWAYAJA, NAMBOOTHIRI IRISHINN. Asymmetric synthesis of $\boldsymbol{\gamma}$ -aminophosphonates: The bio-isosteric analogs of $\boldsymbol{\gamma}$ -aminobutyric acid. J CHEM SCI 2013. [DOI: 10.1007/s12039-013-0418-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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16
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Point V, Malla RK, Carrière F, Canaan S, Spilling CD, Cavalier JF. Enantioselective Inhibition of Microbial Lipolytic Enzymes by Nonracemic Monocyclic Enolphosphonate Analogues of Cyclophostin. J Med Chem 2013; 56:4393-401. [DOI: 10.1021/jm4000787] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Vanessa Point
- CNRS, Aix-Marseille Université,
Enzymologie Interfaciale et Physiologie de la Lipolyse, UMR 7282,
31 Chemin Joseph Aiguier, 13402 Marseille Cedex 20, France
| | - Raj K. Malla
- Department of Chemistry and
Biochemistry, University of Missouri−St. Louis, One University
Boulevard, St. Louis, Missouri 63121, United States
| | - Frederic Carrière
- CNRS, Aix-Marseille Université,
Enzymologie Interfaciale et Physiologie de la Lipolyse, UMR 7282,
31 Chemin Joseph Aiguier, 13402 Marseille Cedex 20, France
| | - Stéphane Canaan
- CNRS, Aix-Marseille Université,
Enzymologie Interfaciale et Physiologie de la Lipolyse, UMR 7282,
31 Chemin Joseph Aiguier, 13402 Marseille Cedex 20, France
| | - Christopher D. Spilling
- Department of Chemistry and
Biochemistry, University of Missouri−St. Louis, One University
Boulevard, St. Louis, Missouri 63121, United States
| | - Jean-François Cavalier
- CNRS, Aix-Marseille Université,
Enzymologie Interfaciale et Physiologie de la Lipolyse, UMR 7282,
31 Chemin Joseph Aiguier, 13402 Marseille Cedex 20, France
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17
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Bezuidenhout DI, Barnard W, van der Westhuizen B, van der Watt E, Liles DC. Multimetal Fischer carbene complexes of Group VI transition metals: synthesis, structure and substituent effect investigation. Dalton Trans 2011; 40:6711-21. [DOI: 10.1039/c1dt10183h] [Citation(s) in RCA: 21] [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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18
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He A, Sutivisedsak N, Spilling CD. Stereoselective synthesis of cyclic ethers via the palladium-catalyzed intramolecular addition of alcohols to phosphono allylic carbonates. Org Lett 2009; 11:3124-7. [PMID: 19586068 PMCID: PMC2717013 DOI: 10.1021/ol900980s] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Cross metathesis of the acrolein-derived phosphono allylic carbonate and hydroxy alkenes using second generation Grubbs catalyst and copper(I) iodide gave the substituted phosphonates in good yield. Stereospecific palladium(0)-catalyzed cyclization gave tetrahydrofuran and tetrahydropyran vinyl phosphonates. Regioselective Wacker oxidation of the vinyl phosphonate gave the beta-keto phosphonate, which underwent HWE reaction with benzaldehyde to yield the unsaturated ketone. The utility of the cross metathesis/cyclization protocol was further demonstrated by a formal synthesis of centrolobine.
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Affiliation(s)
- Anyu He
- Department of Chemistry and Biochemistry, University of Missouri - St. Louis, One University Boulevard, St. Louis, Missouri 63121, USA
| | - Nongnuch Sutivisedsak
- Department of Chemistry and Biochemistry, University of Missouri - St. Louis, One University Boulevard, St. Louis, Missouri 63121, USA
| | - Christopher D. Spilling
- Department of Chemistry and Biochemistry, University of Missouri - St. Louis, One University Boulevard, St. Louis, Missouri 63121, USA
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19
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Grison C, Olszewski TK. Lithiated alkylidenebis(phosphonates): Reactive phosphorus intermediates in the synthesis of 3‐amino‐1‐alkenylphosphonates. HETEROATOM CHEMISTRY 2008. [DOI: 10.1002/hc.20450] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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20
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Yan B, Spilling CD. Synthesis of Cyclopentenones via Intramolecular HWE and the Palladium-Catalyzed Reactions of Allylic Hydroxy Phosphonate Derivatives. J Org Chem 2008; 73:5385-96. [DOI: 10.1021/jo8004028] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Bingli Yan
- Department of Chemistry and Biochemistry, University of Missouri−St. Louis, One University Boulevard, St. Louis, Missouri 63121-4499
| | - Christopher D. Spilling
- Department of Chemistry and Biochemistry, University of Missouri−St. Louis, One University Boulevard, St. Louis, Missouri 63121-4499
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21
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Butti P, Rochat R, Sadow A, Togni A. Palladium-Catalyzed Enantioselective Allylic Phosphination. Angew Chem Int Ed Engl 2008; 47:4878-81. [DOI: 10.1002/anie.200801287] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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22
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Butti P, Rochat R, Sadow A, Togni A. Palladium-Catalyzed Enantioselective Allylic Phosphination. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200801287] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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23
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Rai V, Mobin SM, Namboothiri IN. Cinchonine catalyzed diastereo- and enantioselective Michael addition of α-lithiated phosphonates to nitroalkenes. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.tetasy.2007.11.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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24
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Hong BC, Wu MF, Tseng HC, Huang GF, Su CF, Liao JH. Organocatalytic asymmetric robinson annulation of alpha,beta-unsaturated aldehydes: applications to the total synthesis of (+)-palitantin. J Org Chem 2007; 72:8459-71. [PMID: 17919000 DOI: 10.1021/jo701477v] [Citation(s) in RCA: 106] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The highly enantioselective organocatalytic Robinson annulation of alpha,beta-unsaturated aldehydes was achieved, catalyzed by l-proline and trialkylamines and providing the formal [4 + 2] cycloaddition adducts. Additionally, in some examples in the catalysis with diarylpyrrolinol silyl ethers, the reactions afforded the [4 + 2] adducts with high enantioselectivity (>99.5% ee). The structure of the adduct, obtained from the reaction of 3-methylbut-2-enal and (E)-3-(2-nitrophenyl)acrylaldehyde, was confirmed by X-ray analysis. The absolute configurations of some [4 + 2] cycloadducts were investigated, and the methodology was applied in the synthesis of (+)-palitantin.
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Affiliation(s)
- Bor-Cherng Hong
- Department of Chemistry and Biochemistry, National Chung Cheng University, Chia-Yi, 621 Taiwan, ROC.
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25
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Ramón DJ, Yus M. In the arena of enantioselective synthesis, titanium complexes wear the laurel wreath. Chem Rev 2007; 106:2126-208. [PMID: 16771446 DOI: 10.1021/cr040698p] [Citation(s) in RCA: 230] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Diego J Ramón
- Instituto de Síntesis Organica and Departamento de Química Organica, Universidad de Alicante, Facultad de Ciencias, Apartado 99, E-03080 Alicante, Spain.
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