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Eltayeb S, Marzabadi CH. Synthesis of pyranobenzopyrans from D-glucal using ionic liquids. Carbohydr Res 2023; 531:108873. [PMID: 37421875 DOI: 10.1016/j.carres.2023.108873] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 05/31/2023] [Accepted: 06/12/2023] [Indexed: 07/10/2023]
Abstract
Imidazolium room temperature ionic liquids (RTILs) were used as solvents in the Lewis acid-catalyzed cycloaddition reactions of D-glucal with substituted salicylaldehydes. These reactions selectively led to various, novel, cis-pyrano [4,3-b]benzopyrans in modest yields, different products than those isolated from analogous solution studies. Furan diol was isolated as the major byproduct from all the reactions. The use of RTILs facilitated the use of unprotected sugars in these reactions.
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Affiliation(s)
- Sumiea Eltayeb
- Department of Chemistry & Biochemistry, Seton Hall University, 400 South Orange Ave, South Orange, NJ, 07079, USA
| | - Cecilia H Marzabadi
- Department of Chemistry & Biochemistry, Seton Hall University, 400 South Orange Ave, South Orange, NJ, 07079, USA.
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2
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Highly efficient direct visible-light-mediated oxidative esterification of aldehydes. Photochem Photobiol Sci 2022; 21:819-824. [PMID: 35050487 DOI: 10.1007/s43630-021-00160-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Accepted: 12/14/2021] [Indexed: 10/19/2022]
Abstract
A very efficient one-pot procedure for the direct oxidation of aldehydes to esters mediated by visible-light is presented. Utilizing a combination of indium triflate and N-bromosuccinimide, NBS, with either ortho-esters or alcohols provided rapid access to a variety of esters. Certain substrates convert fully within a few seconds, other more challenging tert-butyl esters were formed in good yield after no more than 4 h.
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3
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Riva L, Lotito AD, Punta C, Sacchetti A. Zinc- and Copper-Loaded Nanosponges from Cellulose Nanofibers Hydrogels: New Heterogeneous Catalysts for the Synthesis of Aromatic Acetals. Gels 2022; 8:54. [PMID: 35049589 PMCID: PMC8774417 DOI: 10.3390/gels8010054] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 01/08/2022] [Accepted: 01/10/2022] [Indexed: 02/05/2023] Open
Abstract
Herein we report the synthesis of cellulose-based metal-loaded nano-sponges and their application as heterogeneous catalysts in organic synthesis. First, the combination in water solution of TEMPO-oxidized cellulose nanofibers (TOCNF) with branched polyethyleneimine (bPEI) and citric acid (CA), and the thermal treatment of the resulting hydrogel, leads to the synthesis of an eco-safe micro- and nano-porous cellulose nano-sponge (CNS). Subsequently, by exploiting the metal chelation characteristics of CNS, already extensively investigated in the field of environmental decontamination, this material is successfully loaded with Cu (II) or Zn (II) metal ions. Efficiency and homogeneity of metal-loading is confirmed by scanning electron microscopy (SEM) analysis with an energy dispersive X-ray spectroscopy (EDS) detector and by inductively coupled plasma-optical emission spectrometry (ICP-OES) analysis. The resulting materials perform superbly as heterogeneous catalysts for promoting the reaction between aromatic aldehydes and alcohols in the synthesis of aromatic acetals, which play a fundamental role as intermediates in organic synthesis. Optimized conditions allow one to obtain conversions higher than 90% and almost complete selectivity toward acetal products, minimizing, and in some cases eliminating, the formation of carboxylic acid by-products. ICP-OES analysis of the reaction medium allows one to exclude any possible metal-ion release, confirming that catalysis undergoes under heterogeneous conditions. The new metal-loaded CNS can be re-used and recycled five times without losing their catalytic activity.
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Affiliation(s)
| | | | | | - Alessandro Sacchetti
- Department of Chemistry, Materials, and Chemical Engineering “G. Natta”, Politecnico di Milano, 20131 Milan, Italy; (L.R.); (A.D.L.); (C.P.)
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4
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Wang D, Cao FR, Lu G, Ren J, Zeng BB. Practical acetalization and transacetalization of carbonyl compounds catalyzed by recyclable PVP-I. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.132250] [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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5
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Single-Crystal-to-Single-Crystal Transformation and Catalytic Properties of New Hybrid Perhalidometallates. Catalysts 2021. [DOI: 10.3390/catal11070758] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
Two new organic–inorganic salts of perhalidometallates with protonated organic amine cations have been synthesized and characterized by X-ray diffraction and thermal analysis. (CHBMAH2)ZnBr4·3/2H2O 1 and (CHBMAH2)ZnCl4 4 [(CHBMAH2)2+: 1,3-cyclohexanebis(methylammonium)] were obtained in single-crystal form. The crystal packing in all of the obtained compounds is governed by the formation of various non-covalent intermolecular forces between tetrahalidometallate anions and organic cations, assisted by water molecules in the hydrates. Hirshfeld surface analysis denotes that the most important contributions to the crystal packing are X···H/H···X (X: Cl, Br, I) and H···H interactions. Interestingly, the compound 1,3-cyclohexanebis(methylammonium)tetrachloridozincate (II) dihydrate, (CHBMAH2)ZnCl4·2H2O 2, undergoes thermally-triggered single-crystal-to-single-crystal (SCSC) transformation upon dehydration to produce a supramolecular solid compound, 1,3-cyclohexanebis(methylammonium) tetrachloridozincate (II), (CHBMAH2)ZnCl4 4. The SCSC transformation causes changes in the lattice parameters and a structural rearrangement. Furthermore, the catalytic properties of (CHBMAH2)ZnCl4·2H2O 2 and (CHBMAH2)CdI4·2H2O 3 have been explored in the acetalization process using various uncommon alcohols, beyond methanol or ethanol, for the first time in the literature, with outstanding results, and opening the door to the formation of alternative acetals.
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Rayes A, Herrera RP, Moncer M, Ara I, Calestani G, Ayed B, Mezzadri F. Synthesis, structural determination and catalytic study of a new 2-D chloro-substituted zinc phosphate, (C8N2H20)[ZnCl(PO3(OH))]2. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2019.127216] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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7
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Chaffey DR, Alamillo-Ferrer C, Davies TE, Taylor SH, Tomkinson NCO, Graham AE. Metal Triflate-Promoted Allylic Substitution Reactions of Cinnamyl Alcohol in the Presence of Orthoesters and Acetals. ACS OMEGA 2019; 4:15985-15991. [PMID: 31592469 PMCID: PMC6776978 DOI: 10.1021/acsomega.9b02059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/05/2019] [Accepted: 08/22/2019] [Indexed: 06/10/2023]
Abstract
The product distribution of ethers formed from the reaction of cinnamyl alcohol with orthoesters in the presence of indium (III) triflate (InOTf)3 is dependent on both the reaction temperature and catalyst loading. Carrying out the reaction at room temperature under low loadings of the catalyst leads to a facile reaction generating the unexpected secondary allyl ether as the major product. In contrast, carrying out the reaction under higher catalyst loadings at elevated temperatures provides the expected primary linear ether in high yield and with excellent selectivity. The etherification reaction is also effective in the presence of acetals and ketals in place of orthoesters and allows for the development of the procedure to encompass a telescoped etherification protocol in which the acetal is generated in situ.
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Affiliation(s)
- Dawn R. Chaffey
- School
of Applied Sciences, University of South
Wales, Pontypridd CF37 4AT, UK
| | - Carla Alamillo-Ferrer
- WestCHEM,
Department of Pure and Applied Chemistry, Thomas Graham Building, University of Strathclyde, Glasgow G1 1XL, UK
| | - Thomas E. Davies
- Cardiff
Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, UK
| | - Stuart H. Taylor
- Cardiff
Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, UK
| | - Nicholas C. O. Tomkinson
- WestCHEM,
Department of Pure and Applied Chemistry, Thomas Graham Building, University of Strathclyde, Glasgow G1 1XL, UK
| | - Andrew E. Graham
- School
of Applied Sciences, University of South
Wales, Pontypridd CF37 4AT, UK
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8
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Salah AMB, Herrera RP, Naïli H. Hydrothermal synthesis of chiral inorganic-organic CoII complex: Structural, thermal and catalytic evaluation. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2018.04.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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9
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Salah AMB, Fendri LB, Bataille T, Herrera RP, Naïli H. Synthesis, structural determination and antimicrobial evaluation of two novel Co II and Zn II halogenometallates as efficient catalysts for the acetalization reaction of aldehydes. Chem Cent J 2018; 12:24. [PMID: 29497955 PMCID: PMC5832660 DOI: 10.1186/s13065-018-0393-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Accepted: 02/15/2018] [Indexed: 12/04/2022] Open
Abstract
Background Complexes of imidazole derivatives with transition metal ions have attracted much attention because of their biological and pharmacological activities, such as antimicrobial, antifungal, antiallergic, antitumoural and antimetastatic properties. In addition, imidazoles occupy an important place owing to their meaningful catalytic activity in several processes, such as in hydroamination, hydrosilylation, Heck reaction and Henry reaction. In this work, we describe the crystallization of two halogenometallate based on 2-methylimidazole. Their IR, thermal analysis, catalytic properties and antibacterial activities have also been investigated. Results Two new isostructural organic-inorganic hybrid materials, based on 2-methyl-1H-imidazole, 1 and 2, were synthesized and fully structurally characterized. The analysis of their crystal packing reveals non-covalent interactions, including C/N–H···Cl hydrogen bonds and π···π stacking interactions, to be the main factor governing the supramolecular assembly of the crystalline complexes. The thermal decomposition of the complexes is a mono-stage process, confirmed by the three-dimensional representation of the powder diffraction patterns (TDXD). The catalytic structure exhibited promising activity using MeOH as solvent and as the unique source of acetalization. Moreover, the antimicrobial results suggested that metal-complexes exhibit significant antimicrobial activity. Conclusion This study highlights again the structural and the biological diversities within the field of inorganic–organic hybrids.
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Affiliation(s)
- Assila Maatar Ben Salah
- Laboratoire Physicochimie de l'Etat Solide, Département de Chimie, Faculté des Sciences de Sfax, Université de Sfax, BP 1171, 3000, Sfax, Tunisia
| | - Lilia Belghith Fendri
- Unité Enzymes et Bioconversion, Ecole Nationale d'Ingénieurs de Sfax, PB 1173, 3038, Sfax, Tunisia
| | - Thierry Bataille
- Ecole Nationale Supérieure de Chimie de Rennes, 11 Allée de Beaulieu, 35708, Rennes cedex 7, France
| | - Raquel P Herrera
- Laboratorio de Organocatálisis Asimétrica, Departamento de Química Orgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza, C/Pedro Cerbuna 12, 50009, Saragossa, Spain
| | - Houcine Naïli
- Laboratoire Physicochimie de l'Etat Solide, Département de Chimie, Faculté des Sciences de Sfax, Université de Sfax, BP 1171, 3000, Sfax, Tunisia.
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10
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Highly Efficient Acetalization and Ketalization Catalyzed by Cobaloxime under Solvent-Free Condition. Catalysts 2018. [DOI: 10.3390/catal8020048] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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11
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Zheng Z, Han B, Wu F, Shi T, Liu J, Zhang Y, Hao J. One-step for the preparation of α-haloacetal of ketones with N-bromosuccinimide/N-chlorosuccinimide (NBS/NCS) and ethylene glycol. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.05.064] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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12
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Hagiwara K, Tabuchi T, Urabe D, Inoue M. Expeditious synthesis of the fused hexacycle of puberuline C via a radical-based cyclization/translocation/cyclization process. Chem Sci 2016; 7:4372-4378. [PMID: 30155084 PMCID: PMC6014077 DOI: 10.1039/c6sc00671j] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2016] [Accepted: 03/11/2016] [Indexed: 11/21/2022] Open
Abstract
The fused 6/7/5/6/6/6-hexacyclic ring system of puberuline C was assembled in 18 steps from 2-(ethoxycarbonyl)cyclohexanone. After the azabicyclo[3.3.1]nonane derivative was sequentially coupled with propargyl magnesium bromide, 2-iodo cyclopentenone and allyl bromide, the pentacycle was constructed in a single step via a radical-based cyclization/translocation/cyclization process. The C11-bridgehead radical generated via C-Br homolysis participated in a 7-endo cyclization, and the 1,5-hydrogen translocation of the resultant radical was followed by transannular 6-exo cyclization to simultaneously realize the construction of the two rings and the introduction of the five contiguous stereocenters. The last 6-exo cyclization was induced by the Mukaiyama aldol reaction, and the C16-ketone was stereoselectively reduced by the action of SmI2/t-BuOH, leading for the first time to the synthesis of the entire hexacycle of puberuline C.
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Affiliation(s)
- Koichi Hagiwara
- Graduate School of Pharmaceutical Sciences , The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku , Tokyo 113-0033 , Japan .
| | - Toshiki Tabuchi
- Graduate School of Pharmaceutical Sciences , The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku , Tokyo 113-0033 , Japan .
| | - Daisuke Urabe
- Graduate School of Pharmaceutical Sciences , The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku , Tokyo 113-0033 , Japan .
| | - Masayuki Inoue
- Graduate School of Pharmaceutical Sciences , The University of Tokyo , 7-3-1 Hongo, Bunkyo-ku , Tokyo 113-0033 , Japan .
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13
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Zheng ZB, Li ZZ, Han BB, He ZM, Shi TF, Cheng P. A mild and efficient method for one-step α-haloacetalization of acetophenones using 1,3-dihalo-5,5-dimethylhydantoin in ethylene glycol. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.03.061] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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14
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Qian B, Zhang G, Ding Y, Huang H. Catalytic cross deoxygenative and dehydrogenative coupling of aldehydes and alkenes: a redox-neutral process to produce skipped dienes. Chem Commun (Camb) 2013; 49:9839-41. [DOI: 10.1039/c3cc45428b] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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15
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Augustine JK, Bombrun A, Sauer WH, Vijaykumar P. Highly efficient and chemoselective acetalization and thioacetalization of aldehydes catalyzed by propylphosphonic anhydride (®T3P) at room temperature. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.07.052] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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16
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Smith BM, Kubczyk TM, Graham AE. Indium(III) triflate catalysed transacetalisation reactions of diols and triols under solvent-free conditions. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.07.048] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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17
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Synthesis, structural investigations, and DFT calculations on novel 3-(1,3-dioxan-2-yl)-10-methyl-10H-phenothiazine derivatives with fluorescence properties. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.01.068] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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18
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Shinde PV, Labade VB, Gujar JB, Shingate BB, Shingare MS. Bismuth triflate catalyzed solvent-free synthesis of 2,4,6-triaryl pyridines and an unexpected selective acetalization of tetrazolo[1,5-a]-quinoline-4-carbaldehydes. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.01.059] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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Madabhushi S, Mallu KKR, Chinthala N, Beeram CR, Vangipuram VS. Efficient and chemoselective acetalization and thioacetalization of carbonyls and subsequent deprotection using InF3 as a reusable catalyst. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2011.11.135] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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20
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Seki C, Hirama M, Hutabarat NR, Takada J, Suttibut C, Takahashi H, Takaguchi T, Kohari Y, Nakano H, Uwai K, Takano N, Yasui M, Okuyama Y, Takeshita M, Matsuyama H. Asymmetric synthesis of isoquinuclidines by Diels–Alder reaction of 1,2-dihydropyridine utilizing a chiral Lewis acid catalyst. Tetrahedron 2012. [DOI: 10.1016/j.tet.2011.12.041] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Yip L, Kubczyk TM, Davies TE, Taylor SH, Apperley DC, Graham AE. Nanoporous aluminosilicate mediated transacetalization reactions: application in glycerol valorization. Catal Sci Technol 2012. [DOI: 10.1039/c2cy20188g] [Citation(s) in RCA: 12] [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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22
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Matsuyama H, Seki C, Hirama M, Suttibut C, D. M. Romauli Hutabarat N, Sakuta N, Tsuchiya T, Kohari Y, Nakano H, Uwai K, Takano N, Okuyama Y, Takeshita M, Yasui M, Osone K. Asymmetric Synthesis of Isoquinuclidine by Diels-Alder Reaction of 1,2-Dihydropyridine and Chiral Dienophile Utilizing a Chiral Lewis Acid. HETEROCYCLES 2012. [DOI: 10.3987/com-11-s(p)71] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Smith BM, Kubczyk TM, Graham AE. Metal triflate catalysed acetal exchange reactions of glycerol under solvent-free conditions. RSC Adv 2012. [DOI: 10.1039/c2ra20100c] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Smith BM, Graham AE. Indium triflate mediated tandem acetalisation-acetal exchange reactions under solvent-free conditions. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2011.09.087] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Efficient oxidation-Wittig olefination-Diels–Alder multicomponent reactions of α-hydroxyketones. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.10.121] [Citation(s) in RCA: 19] [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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Landa A, Puente Á, Santos JI, Vera S, Oiarbide M, Palomo C. Catalytic Conjugate Additions of Geminal Bis(sulfone)s: Expanding the Chemistry of Sulfones as Simple Alkyl Anion Equivalents. Chemistry 2009; 15:11954-62. [DOI: 10.1002/chem.200902094] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Mansilla H, Afonso MM. Iron(III) Tosylate in the Preparation of Dimethyl and Diethyl Acetals from Ketones and β -Keto Enol Ethers from Cyclic β -Diketones. SYNTHETIC COMMUN 2008. [DOI: 10.1080/00397910802219361] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Horacio Mansilla
- a Instituto de Productos Naturales y Agrobiología del C.S.I.C. , La Laguna, Tenerife, Spain
| | - María M. Afonso
- b Instituto Universitario de Bioorgánica “Antonio González,” Departamento de Química Orgánica, Universidad de la Laguna , La Laguna, Tenerife, Spain
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Eshghi H, Rahimizadeh M, Saberi S. Fe(HSO4)3 as an inexpensive, eco-friendly, heterogeneous and reusable catalyst for acetal/ketal formation and their facile regeneration. CATAL COMMUN 2008. [DOI: 10.1016/j.catcom.2008.06.015] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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Indium(III)trifluoromethanesulfonate as a mild, efficient catalyst for the formation of acetals and ketals in the presence of acid sensitive functional groups. Tetrahedron 2008. [DOI: 10.1016/j.tet.2008.01.118] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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30
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Wu S, Dai W, Yin S, Li W, Au CT. Bismuth Subnitrate as an Efficient Heterogeneous Catalyst for Acetalization and Ketalization of Carbonyl Compounds with Diols. Catal Letters 2008. [DOI: 10.1007/s10562-008-9435-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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31
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32
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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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Zhu K, Simpson JH, Delaney EJ, Nugent WA. Synthesis of Z-5-Carboxymethylene-1,3-dioxolan-4-ones: A Better Way. J Org Chem 2007; 72:3949-51. [PMID: 17432907 DOI: 10.1021/jo0700171] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The title compounds were prepared by a straightforward two-step procedure. Tartaric acid was first protected as either a bis(ketal) or a bis(acetal). This intermediate was then treated with potassium tert-butoxide at reduced temperature to effect a stereoselective elimination leading to the Z diastereomer of the alpha,beta-unsaturated acid. This protocol is useful for the laboratory-scale synthesis of these compounds but can also be scaled up to produce kilogram quantities of the material.
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Affiliation(s)
- Keming Zhu
- Bristol-Myers Squibb Company, Process Research and Development Department, P.O. Box 4000, Princeton, New Jersey 08543, USA
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