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Cawrse BM, Takahashi M, Grajkowski A, Beaucage SL. An Alternate Process for the Solid-Phase Synthesis and Solid-Phase Purification of Synthetic Nucleic Acid Sequences. Curr Protoc 2023; 3:e648. [PMID: 36629495 DOI: 10.1002/cpz1.648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
The chemical synthesis of a riboside phosphoramidite has been achieved to provide a 5-O-capture linker and a 2-O-silyl ether protecting group with the intent of enabling an efficient solid-phase purification of synthetic DNA sequences. The riboside phosphoramidite has been incorporated into a DNA sequence while performing the penultimate automated solid-phase synthesis cycle of the sequence. The terminal 5-O-riboside moiety of the resulting DNA sequence is then conjugated to a capture linker to create an anchor for the solid-phase purification of the DNA sequence conjugate. Release of all DNA sequences from the synthesis support is achieved under standard basic conditions to yield a mixture of the desired DNA sequence conjugate along with unconjugated, shorter-than-full-length sequence contaminants. Upon exposure of all DNA sequences to a capture solid support, only the DNA sequence conjugate is chemoselectively captured, thereby allowing the unconjugated shorter-than-full-length DNA sequences to be efficiently washed away from the capture support. After 2-O-cleavage of the silyl ether protecting group from the terminal riboside ethylphosphate triester conjugate, the solid-phase-purified DNA sequence is efficiently released from the capture support through an innovative intramolecular cyclodeesterification of the ethylphosphate triester, prompted by the riboside's rigid cis-diol conformer, to provide a highly pure DNA sequence. Published 2023. This article is a U.S. Government work and is in the public domain in the USA. Basic Protocol 1: Preparation of 5-O-(4,4'-dimethoxytrityl)-2-O-tert-butyldimethylsilyl-1,4-anhydro-D-ribitol (3) Basic Protocol 2: Preparation of 5-O-(4,4'-dimethoxytrityl)-2-O-tert-butyldimethylsilyl-3-O-[(N,N-diisopropylamino)ethyloxyphosphinyl]-1,4-anhydro-D-ribitol (6). Basic Protocol 3: Automated synthesis of the chimeric solid-phase-linked DNA sequence 8. Support Protocol: Preparation of 2-cyanoethyl-(5-oxohexyl)-N,N-diisopropylphosphoramidite (9). Basic Protocol 4: Solid-phase purification of the chimeric DNA sequence 10.
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Affiliation(s)
- Brian M Cawrse
- Laboratory of Biological Chemistry, Food and Drug Administration, Silver Spring, Maryland
| | - Mayumi Takahashi
- Laboratory of Biological Chemistry, Food and Drug Administration, Silver Spring, Maryland
| | - Andrzej Grajkowski
- Laboratory of Biological Chemistry, Food and Drug Administration, Silver Spring, Maryland
| | - Serge L Beaucage
- Laboratory of Biological Chemistry, Food and Drug Administration, Silver Spring, Maryland
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2
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Grajkowski A, Cawrse BM, Takahashi M, Beaucage SL. An improved process for the release of synthetic DNA sequences from a solid-phase capture support. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2022.154077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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3
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Zhao TT, Yu WL, Feng ZT, Qin HN, Zheng HX, Xu PF. Photoredox/nickel dual catalyzed stereospecific synthesis of distal alkenyl ketones. Chem Commun (Camb) 2022; 58:1171-1174. [PMID: 34981102 DOI: 10.1039/d1cc06566a] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The selective C-C bond deconstruction/refunctionalization via a photoredox/nickel dual-catalyzed hydroalkylation of alkynes is developed under mild reaction conditions. In this protocol, a broad range of alkyl- and aryl-alkynes could react smoothly with cycloalkanols, affording the corresponding distal and site-specific vinyl-substituted ketones with high yields and excellent regioselectivities. Moreover, DFT calculations verified that the electron-rich behavior of aromatics and weak Brønsted bases have a common effect on the photocatalytic oxidant ring-opening of cyclobutanols.
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Affiliation(s)
- Tian-Tian Zhao
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China.
| | - Wan-Lei Yu
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China.
| | - Zhi-Tao Feng
- Department of Chemistry, University of California Davis, One Shields Avenue, Davis, CA 95616, USA
| | - Hao-Ni Qin
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China.
| | - Hai-Xue Zheng
- State Key Laboratory of Veterinary Etiological Biology, College of Veterinary Medicine, Lanzhou University, Lanzhou 730000, P. R. China
| | - Peng-Fei Xu
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China. .,State Key Laboratory of Veterinary Etiological Biology, College of Veterinary Medicine, Lanzhou University, Lanzhou 730000, P. R. China
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4
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Paris TJ, Schwartz C, Sundall E, Willand-Charnley R. Rapid, One-Step Synthesis of α-Ketoacetals via Electrophilic Etherification. J Org Chem 2021; 86:14797-14811. [PMID: 34569793 DOI: 10.1021/acs.joc.1c01588] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Herein, we report a rapid, one-step synthesis of α-ketoacetals via electrophilic etherification of α-alkoxy enolates and monoperoxyacetals. Methyl, primary, and secondary α-ketoacetals were obtained in 44-63% yields from tetrahydropyranyl substrates; using methyl tetrahydropyranyl, alkyl tetrahydropyranyl, or methyl tetrahydrofuranyl peroxyacetals, however, methyl and primary products were isolated in 66-90% yields. The present method is applied to C-O bond formation at tertiary carbons, via alkyl and methyl peroxyacetals, with yields of 25-65%. Intermolecular "alkoxyl" transfer, from peroxyacetal to α-alkoxy enolate, relies heavily on decreased steric bulk surrounding the peroxide bond and site of etherification; additionally, we found the α-OCH3 group to be critical in ensuring product formation. α-Ketoacetals demonstrated excellent reactivity, as selective, nucleophilic attack at the unprotected carbonyl furnished α-hydroxy acetals in 80-100% yields; subsequent hydrolysis of the foregoing compounds provided α-hydroxy aldehydes in yields of 58-90%.
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Affiliation(s)
- Timothy J Paris
- Department of Chemistry and Biochemistry, South Dakota State University, Brookings, South Dakota 57007, United States
| | - Chris Schwartz
- Department of Chemistry and Biochemistry, South Dakota State University, Brookings, South Dakota 57007, United States
| | - Eric Sundall
- Department of Chemistry and Biochemistry, South Dakota State University, Brookings, South Dakota 57007, United States
| | - Rachel Willand-Charnley
- Department of Chemistry and Biochemistry, South Dakota State University, Brookings, South Dakota 57007, United States
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5
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Desvals A, Baudron SA, Bulach V, Hoffmann N. Photocycloadditions of Arenes Derived from Lignin. J Org Chem 2021; 86:13310-13321. [PMID: 34551249 DOI: 10.1021/acs.joc.1c01361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Intramolecular photocycloaddition reactions of 3,4-alkoxybenzonitriles derived from vanillin with alkenes have been investigated. In contrast to previous reports on photochemical reactions with these compounds, mainly [2 + 3] cycloaddition has been observed. A competing [2 + 2] photocycloaddition plays a minor role. Most probably, these additions occur at the singlet state S1. In the case of a triplet reaction, a different regioselectivity of the [2 + 2] cycloaddition would be observed. Linear and angular [2 + 3] cycloadducts are formed as major products. The first isomer is transformed in the second one by a photochemical vinyl-cyclopropane rearrangement, which increases the selectivity of the reaction. The influence of the substitution pattern on the reactivity and the selectivity has also been investigated.
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Affiliation(s)
- Arthur Desvals
- ICMR, Equipe de Photochimie, UFR Sciences, CNRS, Université de Reims Champagne-Ardenne, 51687 Reims, France
| | - Stéphane A Baudron
- CNRS, CMC UMR 7140, Université de Strasbourg, 4 rue Blaise Pascal, 67000 Strasbourg, France
| | - Véronique Bulach
- CNRS, CMC UMR 7140, Université de Strasbourg, 4 rue Blaise Pascal, 67000 Strasbourg, France
| | - Norbert Hoffmann
- ICMR, Equipe de Photochimie, UFR Sciences, CNRS, Université de Reims Champagne-Ardenne, 51687 Reims, France
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6
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Wulkesch C, Czekelius C. Straightforward Synthesis of Fluorinated Enals via Photocatalytic α-Perfluoroalkenylation of Aldehydes. J Org Chem 2021; 86:7425-7438. [PMID: 34008975 DOI: 10.1021/acs.joc.1c00383] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
(Per)fluorinated substances represent an important compound class with regard to drug design and material chemistry. We found a mild, operationally simple, and inexpensive photocatalytic perfluoroalkenylation reaction giving tetrasubstituted, highly electron-deficient enals straight from aldehydes. This one-step reaction tolerates various functional groups and can be applied to a wide range of substrates giving the products in yields of 52-84%.
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Affiliation(s)
- Christian Wulkesch
- Department of Organic Chemistry and Macromolecular Chemistry, Heinrich-Heine-Universität Düsseldorf, 40225 Düsseldorf, Germany
| | - Constantin Czekelius
- Department of Organic Chemistry and Macromolecular Chemistry, Heinrich-Heine-Universität Düsseldorf, 40225 Düsseldorf, Germany
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Villarón D, Siegler MA, Wezenberg SJ. A photoswitchable strapped calix[4]pyrrole receptor: highly effective chloride binding and release. Chem Sci 2021; 12:3188-3193. [PMID: 34164086 PMCID: PMC8179391 DOI: 10.1039/d0sc06686a] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Accepted: 01/12/2021] [Indexed: 12/12/2022] Open
Abstract
A stiff-stilbene strapped calix[4]pyrrole receptor can be reversibly switched by light between a strong chloride-binding Z-isomer and a very weakly binding E-isomer. The light-induced switching process is monitored by UV-Vis and 1H NMR spectroscopy and chloride binding is studied in detail using both 1H NMR and ITC titrations in DMSO and MeCN. In DMSO, at millimolar concentrations, switching from a fully bound to an almost fully unbound state can be triggered. Quantification of the binding constants in MeCN reveals an extraordinary 8000-fold affinity difference between the Z- and E-isomer. Single crystal X-ray crystallographic analysis gives insight into the structure of the photogenerated E-isomer and the geometry of the chloride-bound receptors is optimized by DFT calculations. The highly effective control of binding affinity demonstrated in this work opens up new prospects for on demand binding and release in extractions and photocontrol of membrane transport processes, among other applications.
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Affiliation(s)
- David Villarón
- Leiden Institute of Chemistry, Leiden University Einsteinweg 55 2333 CC Leiden The Netherlands
| | - Maxime A Siegler
- Department of Chemistry, Johns Hopkins University 3400 N. Charles St. Baltimore MD 21218 USA
| | - Sander J Wezenberg
- Leiden Institute of Chemistry, Leiden University Einsteinweg 55 2333 CC Leiden The Netherlands
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8
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Bryant DJ, Berlin KD, Bunce RA. 1,3,3-Trimethylindolin-5-amine and 4-Formylphenyl 4,4-Dimethylchroman-6-carboxylate Thiosemicarbazone (OHet72). ORG PREP PROCED INT 2020. [DOI: 10.1080/00304948.2020.1834819] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Daniel J. Bryant
- Department of Chemistry, Oklahoma State University, Stillwater, Oklahoma
| | - K. Darrell Berlin
- Department of Chemistry, Oklahoma State University, Stillwater, Oklahoma
| | - Richard A. Bunce
- Department of Chemistry, Oklahoma State University, Stillwater, Oklahoma
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9
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Kim M, Truss M, Pagare PP, Essandoh MA, Zhang Y, Williams DA. Structure activity relationship exploration of 5-hydroxy-2-(3-phenylpropyl)chromones as a unique 5-HT 2B receptor antagonist scaffold. Bioorg Med Chem Lett 2020; 30:127511. [PMID: 32853682 DOI: 10.1016/j.bmcl.2020.127511] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Revised: 08/17/2020] [Accepted: 08/18/2020] [Indexed: 10/23/2022]
Abstract
Antagonists for the serotonin receptor 2B (5-HT2B) have clinical applications towards migraine, anxiety, irritable bowl syndrome, and MDMA abuse; however, few selective 5-HT2B antagonists have been identified. Previous studies from these labs identified a natural product, 5-hydroxy-2-(2-phenylethyl)chromone (5-HPEC, 2) as the first non-nitrogenous ligand for the 5-HT2B receptor. Studies on 5-HPEC optimization led to the identification of 5-hydroxy-2-(3-phenylpropyl)chromone (5-HPPC, 3), which showed a tenfold improvement in binding affinity over 2 at 5-HT2B. This study aimed to further improve receptor pharmacology of this unique scaffold. Guided by molecular modeling studies modifications at the C-3' and C-4' positions of 3 were made to probe their effects on ligand binding affinity and efficacy. Among the derivatives synthesized 5-hydroxy-2-(3-(3-cyanophenyl)propyl)chromone (5-HCPC, 3d) showed the most promise with a multifold improvement in binding affinity (pKi = 7.1 ± 0.07) over 3 with retained antagonism.
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Affiliation(s)
- Minsoo Kim
- Department of Chemistry, Kalamazoo College, Kalamazoo, MI 49006, USA
| | - Myles Truss
- Department of Chemistry, Kalamazoo College, Kalamazoo, MI 49006, USA
| | - Piyusha P Pagare
- Department of Medicinal Chemistry, Virginia Commonwealth University, Richmond, VA 23298, USA
| | - Martha A Essandoh
- Department of Chemistry, Oklahoma State University, Stillwater, OK 74078, USA
| | - Yan Zhang
- Department of Medicinal Chemistry, Virginia Commonwealth University, Richmond, VA 23298, USA
| | - Dwight A Williams
- Department of Chemistry, Kalamazoo College, Kalamazoo, MI 49006, USA.
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10
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Tang Y, Meador RIL, Malinchak CT, Harrison EE, McCaskey KA, Hempel MC, Funk TW. (Cyclopentadienone)iron-Catalyzed Transfer Dehydrogenation of Symmetrical and Unsymmetrical Diols to Lactones. J Org Chem 2020; 85:1823-1834. [PMID: 31880449 DOI: 10.1021/acs.joc.9b01884] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Air-stable iron carbonyl compounds bearing cyclopentadienone ligands with varying substitution were explored as catalysts in dehydrogenative diol lactonization reactions using acetone as both the solvent and hydrogen acceptor. Two catalysts with trimethylsilyl groups in the 2- and 5-positions, [2,5-(SiMe3)2-3,4-(CH2)4(η4-C4C═O)]Fe(CO)3 (1) and [2,5-(SiMe3)2-3,4-(CH2)3(η4-C4C═O)]Fe(CO)3 (2), were found to be the most active, with 2 being the most selective in the lactonization of diols containing both primary and secondary alcohols. Lactones containing five-, six-, and seven-membered rings were successfully synthesized, and no over-oxidations to carboxylic acids were detected. The lactonization of unsymmetrical diols containing two primary alcohols occurred with catalyst 1, but selectivity was low based on alcohol electronics and modest based on alcohol sterics. Evidence for a transfer dehydrogenation mechanism was found, and insight into the origin of selectivity in the lactonization of 1°/2° diols was obtained. Additionally, spectroscopic evidence for a trimethylamine-ligated iron species formed in solution during the reaction was discovered.
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Affiliation(s)
- Yidan Tang
- Department of Chemistry , Gettysburg College , Gettysburg , Pennsylvania 17325 , United States
| | - Rowan I L Meador
- Department of Chemistry , Gettysburg College , Gettysburg , Pennsylvania 17325 , United States
| | - Casina T Malinchak
- Department of Chemistry , Gettysburg College , Gettysburg , Pennsylvania 17325 , United States
| | - Emily E Harrison
- Department of Chemistry , Gettysburg College , Gettysburg , Pennsylvania 17325 , United States
| | - Kimberly A McCaskey
- Department of Chemistry , Gettysburg College , Gettysburg , Pennsylvania 17325 , United States
| | - Melanie C Hempel
- Department of Chemistry , Gettysburg College , Gettysburg , Pennsylvania 17325 , United States
| | - Timothy W Funk
- Department of Chemistry , Gettysburg College , Gettysburg , Pennsylvania 17325 , United States
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11
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Sun HR, Zhao Q, Yang H, Yang S, Gou BB, Chen J, Zhou L. Chiral Phosphoric-Acid-Catalyzed Cascade Prins Cyclization. Org Lett 2019; 21:7143-7148. [PMID: 31414820 DOI: 10.1021/acs.orglett.9b02714] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Asymmetric Prins cyclization of in situ generated quinone methides and o-aminobenzaldehyde has been developed with chiral phosphoric acid as an efficient catalyst. This unconventional method provides a facile access to diverse functionalized trans-fused pyrano-/furo-tetrahydroquinoline derivatives in excellent yield and with excellent diastereo- and enantioselectivities (up to 99% yield and 99% ee). Mechanistic studies suggested that the three adjacent tertiary stereocenters were constructed through the sequential formation of C-O, C-C, and C-N bonds.
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Affiliation(s)
- Huai-Ri Sun
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, Department of Chemistry & Materials Science, National Demonstration Center for Experimental Chemistry Education , Northwest University , Xi'an 710127 , P. R. China
| | - Qingyang Zhao
- School of Pharmaceutical Sciences (Shenzhen) , Sun Yat-sen University , Shenzhen 518107 , P. R. China
| | - Hui Yang
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, Department of Chemistry & Materials Science, National Demonstration Center for Experimental Chemistry Education , Northwest University , Xi'an 710127 , P. R. China
| | - Sen Yang
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, Department of Chemistry & Materials Science, National Demonstration Center for Experimental Chemistry Education , Northwest University , Xi'an 710127 , P. R. China
| | - Bo-Bo Gou
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, Department of Chemistry & Materials Science, National Demonstration Center for Experimental Chemistry Education , Northwest University , Xi'an 710127 , P. R. China
| | - Jie Chen
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, Department of Chemistry & Materials Science, National Demonstration Center for Experimental Chemistry Education , Northwest University , Xi'an 710127 , P. R. China
| | - Ling Zhou
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education, Department of Chemistry & Materials Science, National Demonstration Center for Experimental Chemistry Education , Northwest University , Xi'an 710127 , P. R. China
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12
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Kadam VD, Rao B SS, Mahesh SK, Chakraborty M, Vemulapalli SPB, Dayaka SN, Sudhakar G. Stereoselective Access to the Core Structure of Macroline-Type Indole Alkaloids: Total Synthesis of Macroline and Alstomicine. Org Lett 2018; 20:4782-4786. [PMID: 30067369 DOI: 10.1021/acs.orglett.8b01921] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Rapid synthesis of the pentacyclic core structure of macroline-type indole alkaloids, and its application in the total synthesis of macroline and alstomicine is described. The core structure was accomplished in a highly stereocontrolled manner via two key steps, Ireland-Claisen rearrangement and Pictet-Spengler cyclization, commencing from a readily available starting material l-tryptophan, which obviated the need of a particular chiral source as an external catalyst, reagent, or internal auxiliary.
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Affiliation(s)
- Vilas D Kadam
- Academy of Scientific & Innovative Research (AcSIR) , New Delhi , India
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13
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Ghosh AK, Tomaine AJ, Cantwell KE. Lewis Acid Mediated Cyclizations: Diastereoselective Synthesis of Six- to Eight-Membered Substituted Cyclic Ethers. SYNTHESIS-STUTTGART 2017; 49:4229-4246. [PMID: 29983455 PMCID: PMC6034514 DOI: 10.1055/s-0036-1589054] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Cyclic ethers are widely abundant in natural products. Cyclic ether templates are also utilized in drug design and medicinal chemistry. Although the synthetic processes for this class of compounds have been studied extensively with respect to five- and six-membered rings, medium-sized cyclic ethers are synthetically more challenging due to a variety of factors. Herein, we report our results on the Lewis acid catalyzed synthesis of medium-sized cyclic ethers in a diastereoselective manner.
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Affiliation(s)
- Arun K. Ghosh
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN, 47907, USA
- Department of Medicinal Chemistry, Purdue University, 575 W Stadium Ave, West Lafayette, IN, 47907, USA
| | - Anthony J. Tomaine
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN, 47907, USA
| | - Kelsey E. Cantwell
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN, 47907, USA
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14
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Boev VI, Moskalenko AI, Belopukhov SL, Nikonova GN. Stereoselective synthesis of 2-aryl-4-en-1-ols, promising synthons for the preparation of oxygen heterocycles. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2017. [DOI: 10.1134/s1070428017020051] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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15
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Boev VI, Moskalenko AI, Belopukhov SL, Nikonova GN. Stereodirected reactions of salicilaldehyde derivatives with tert-butyl 3(4)-hydroxy-2(3)-(3-methylbut-2-enyl)- piperidine-1-carboxylates as an efficient preparation procedure of tetrahydropyran derivatives fused with a piperidine ring. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2016. [DOI: 10.1134/s1070428016080108] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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16
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Harada S, Li K, Kino R, Takeda T, Wu CH, Hiraoka S, Nishida A. Construction of Optically Active Isotwistanes and Aminocyclitols Using Chiral Cyclohexadiene as a Common Intermediate. Chem Pharm Bull (Tokyo) 2016; 64:1474-1483. [PMID: 27452927 DOI: 10.1248/cpb.c16-00431] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We have developed a new method for synthesizing chiral isotwistane and homoisotwistane skeletons as well as aminocyclitols in a highly stereoselective manner. These results were achieved through the use of a common intermediate, which was derived from the ytterbium-catalyzed asymmetric Diels-Alder reaction of Danishefsky diene.
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Affiliation(s)
- Shinji Harada
- Graduate School of Pharmaceutical Sciences, Chiba University
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17
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Lin W, Cheng J, Ma S. Iron(III) Chloride-Catalyzed Tandem Aza-Prins/Friedel-Crafts Cyclization of 2-Arylethyl-2,3-butadienyl Tosylamides and Aldehydes-An Efficient Synthesis of Benzo[f]isoquinolines. Adv Synth Catal 2016. [DOI: 10.1002/adsc.201600107] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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18
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Reddy BS, Swathi V, Bhadra MP, Raju MK, Kunwar A. Tandem vinylcyclopropane ring opening/Prins cyclization for the synthesis of 2,3-disubstituted tetrahydropyrans. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.03.062] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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19
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Ghosh AK, Tomaine AJ, Cantwell KE. Stereoselective Synthesis of Substituted Oxocene Cores by Lewis Acid Promoted Cyclization. Org Lett 2016; 18:396-9. [PMID: 26829580 DOI: 10.1021/acs.orglett.5b03411] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Substituted oxocene derivatives have been synthesized by Lewis acid catalyzed reactions of ε-hydroxyalkene and substituted aromatic aldehydes. The Cu(OTf)2-bis-phosphine catalyzed reaction typically provides substituted dihydropyran derivatives through an olefin migration followed by a Prins cyclization. The corresponding reaction catalyzed by TMSOTf or BF3·OEt2 provided eight-membered cyclic ethers (oxocenes), selectively. This methodology provides convenient access to a variety of 2,4,8-trisubstituted oxocenes in good yields and excellent diastereoselectivities.
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Affiliation(s)
- Arun K Ghosh
- Department of Chemistry and Department of Medicinal Chemistry, Purdue University , 560 Oval Drive, West Lafayette, Indiana 47907, United States
| | - Anthony J Tomaine
- Department of Chemistry and Department of Medicinal Chemistry, Purdue University , 560 Oval Drive, West Lafayette, Indiana 47907, United States
| | - Kelsey E Cantwell
- Department of Chemistry and Department of Medicinal Chemistry, Purdue University , 560 Oval Drive, West Lafayette, Indiana 47907, United States
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20
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Alguacil J, Reyes D, Aubin Y, Roy B, Périgaud C, Champagne E, Peyrottes S. Exploring synthetic pathways for nucleosidic derivatives of potent phosphoantigens. NEW J CHEM 2016. [DOI: 10.1039/c5nj03614c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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21
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Sultana S, Devi NR, Saikia AK. Synthesis of Substituted Tetrahydropyrans and Tetrahydrofurans via Intramolecular Hydroalkoxylation of Alkenols. ASIAN J ORG CHEM 2015. [DOI: 10.1002/ajoc.201500314] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Sabera Sultana
- Department of Chemistry; Indian Institute of Technology Guwahati; Guwahati 781039 Assam India
| | - Ngangbam Renubala Devi
- Department of Chemistry; Indian Institute of Technology Guwahati; Guwahati 781039 Assam India
| | - Anil K. Saikia
- Department of Chemistry; Indian Institute of Technology Guwahati; Guwahati 781039 Assam India
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22
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Tsui GC, Liu L, List B. Die organokatalytische asymmetrische Prins-Cyclisierung. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201500219] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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23
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Tsui GC, Liu L, List B. The Organocatalytic Asymmetric Prins Cyclization. Angew Chem Int Ed Engl 2015; 54:7703-6. [DOI: 10.1002/anie.201500219] [Citation(s) in RCA: 130] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2015] [Revised: 03/25/2015] [Indexed: 01/25/2023]
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24
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Ghosh AK, Keyes C, Veitschegger AM. FeCl 3-Catalyzed Tandem Prins and Friedel-Crafts Cyclization: A Highly Diastereoselective Route to Polycyclic Ring Structures. Tetrahedron Lett 2014; 55:4251-4254. [PMID: 25104867 DOI: 10.1016/j.tetlet.2014.05.092] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Catalytic FeCl3 in the presence of 4Å molecular sieves has been shown to effect highly diastereoselective tandem Prins and Friedel-Crafts cyclization of substituted (E/Z)-6-phenylhex-3-en-1-ol and a variety of aldehydes to provide a range of polycyclic compounds in good to excellent yields. The reaction of an enantioenriched alcohol with an aldehyde provided the cyclization product without loss of optical activity. Furthermore, a Lewis acid catalyzed ring opening resulted in functionalized tetralin derivatives with multiple chiral centers.
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Affiliation(s)
- Arun K Ghosh
- Department of Chemistry and Department of Medicinal Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
| | - Chad Keyes
- Department of Chemistry and Department of Medicinal Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
| | - Anne M Veitschegger
- Department of Chemistry and Department of Medicinal Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
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25
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Ghosh AK, Chen ZH, Effenberger KA, Jurica MS. Enantioselective total syntheses of FR901464 and spliceostatin A and evaluation of splicing activity of key derivatives. J Org Chem 2014; 79:5697-709. [PMID: 24873648 PMCID: PMC4066912 DOI: 10.1021/jo500800k] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
![]()
FR901464
(1) and spliceostatin A (2)
are potent inhibitors of spliceosomes. These compounds have shown
remarkable anticancer activity against multiple human cancer cell
lines. Herein, we describe efficient, enantioselective syntheses of
FR901464, spliceostatin A, six corresponding diastereomers and an
evaluation of their splicing activity. Syntheses of spliceostatin
A and FR901464 were carried out in the longest linear sequence of
9 and 10 steps, respectively. To construct the highly functionalized
tetrahydropyran A-ring, we utilized
CBS reduction, Achmatowicz rearrangement, Michael addition, and reductive
amination as key steps. The remarkable diastereoselectivity of the
Michael addition was specifically demonstrated with different substrates
under various reaction conditions. The side chain B was prepared from an optically active alcohol, followed
by acetylation and hydrogenation over Lindlar’s catalyst. The
other densely functionalized tetrahydropyran C-ring was derived from readily available (R)-isopropylidene glyceraldehyde through a route featuring 1,2-addition,
cyclic ketalization, and regioselective epoxidation. These fragments
were coupled together at a late stage through amidation and cross-metathesis
in a convergent manner. Six key diastereomers were then synthesized
to probe the importance of specific stereochemical features of FR901464
and spliceostatin A, with respect to their in vitro splicing activity.
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Affiliation(s)
- Arun K Ghosh
- Department of Chemistry and Department of Medicinal Chemistry, Purdue University , 560 Oval Drive, West Lafayette, Indiana 4790, United States
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26
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Lalli C, van de Weghe P. Enantioselective Prins cyclization: BINOL-derived phosphoric acid and CuCl synergistic catalysis. Chem Commun (Camb) 2014; 50:7495-8. [DOI: 10.1039/c4cc02826k] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synergistic catalysis between a chiral phosphoric acid and CuCl allows the development of the first enantioselective Prins cyclization.
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Affiliation(s)
- Claudia Lalli
- Université de Rennes 1
- UMR 6226 CNRS
- Institut des Sciences Chimiques de Rennes
- Equipe PNSCM
- UFR des Sciences Biologiques et Pharmaceutiques
| | - Pierre van de Weghe
- Université de Rennes 1
- UMR 6226 CNRS
- Institut des Sciences Chimiques de Rennes
- Equipe PNSCM
- UFR des Sciences Biologiques et Pharmaceutiques
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27
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Ghosh AK, Chen ZH. Enantioselective syntheses of FR901464 and spliceostatin A: potent inhibitors of spliceosome. Org Lett 2013; 15:5088-91. [PMID: 24050251 PMCID: PMC3827971 DOI: 10.1021/ol4024634] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Enantioselective syntheses of FR901464 and spliceostatin A, potent spliceosome inhibitors, are described. The synthesis of FR901464 has been accomplished in a convergent manner in 10 linear steps (20 total steps). The A-tetrahydropyran ring was constructed from (R)-isopropylidene glyceraldehyde. The functionalized tetrahydropyran B-ring was synthesized utilizing a Corey-Bakshi-Shibata reduction, an Achmatowicz reaction, and a stereoselective Michael addition as the key steps. Coupling of A- and B-ring fragments was accomplished via cross-metathesis.
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Affiliation(s)
- Arun K. Ghosh
- Department of Chemistry and Department of Medicinal Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
| | - Zhi-Hua Chen
- Department of Chemistry and Department of Medicinal Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
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28
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Palmieri A, Gabrielli S, Ballini R. Easy and direct conversion of tosylates and mesylates into nitroalkanes. Beilstein J Org Chem 2013; 9:533-6. [PMID: 23616794 PMCID: PMC3628907 DOI: 10.3762/bjoc.9.58] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2012] [Accepted: 02/19/2013] [Indexed: 12/02/2022] Open
Abstract
Tosylates and mesylates were directly converted into the corresponding nitroalkanes, by their treatment with tetrabutylammonium nitrite (TBAN) under mild conditions.
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Affiliation(s)
- Alessandro Palmieri
- "Green Chemistry Group", School of Science and Technology, Chemistry Division, University of Camerino, Via S. Agostino 1, 62032 Camerino (MC), Italy
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29
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Ghosh AK, Kass J, Nicponski DR, Keyes C. Diastereoselective Synthesis of Substituted Tetrahydropyrans by Copper(II)-Bisphosphine-Catalyzed Olefin Migration and Prins Cyclization. SYNTHESIS-STUTTGART 2012; 44:3579-3589. [PMID: 30449905 DOI: 10.1055/s-0032-1317495] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
We developed a copper(II) triflate-bisphosphine complex catalyzed olefin migration and Prins cyclization which lead to the synthesis of substituted tetrahydropyran derivatives. The protocol is convenient and a variety of substituted tetrahydropyrans were obtained in good to excellent yields with excellent diastereoselectivities.
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Affiliation(s)
- Arun K Ghosh
- Department of Chemistry and Department of Medicinal Chemistry, Purdue University, West Lafayette, IN 47907, USA, Fax +1(765)4961612
| | - Jorden Kass
- Department of Chemistry and Department of Medicinal Chemistry, Purdue University, West Lafayette, IN 47907, USA, Fax +1(765)4961612
| | - Daniel R Nicponski
- Department of Chemistry and Department of Medicinal Chemistry, Purdue University, West Lafayette, IN 47907, USA, Fax +1(765)4961612
| | - Chad Keyes
- Department of Chemistry and Department of Medicinal Chemistry, Purdue University, West Lafayette, IN 47907, USA, Fax +1(765)4961612
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30
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Zheng K, Liu X, Qin S, Xie M, Lin L, Hu C, Feng X. Completely OH-Selective FeCl3-Catalyzed Prins Cyclization: Highly Stereoselective Synthesis of 4-OH-Tetrahydropyrans. J Am Chem Soc 2012; 134:17564-73. [DOI: 10.1021/ja3062002] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ke Zheng
- Key Laboratory of Green Chemistry
& Technology,
Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, People’s Republic
of China
| | - Xiaohua Liu
- Key Laboratory of Green Chemistry
& Technology,
Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, People’s Republic
of China
| | - Song Qin
- Key Laboratory of Green Chemistry
& Technology,
Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, People’s Republic
of China
| | - Mingsheng Xie
- Key Laboratory of Green Chemistry
& Technology,
Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, People’s Republic
of China
| | - Lili Lin
- Key Laboratory of Green Chemistry
& Technology,
Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, People’s Republic
of China
| | - Changwei Hu
- Key Laboratory of Green Chemistry
& Technology,
Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, People’s Republic
of China
| | - Xiaoming Feng
- Key Laboratory of Green Chemistry
& Technology,
Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, People’s Republic
of China
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31
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Ghosh AK, Nicponski DR, Kass J. A Tandem Olefin Migration and Prins Cyclization Using Cu(OTf)(2)-Bisphosphine Complexes: An Improved Synthesis of Functionalized Tetrahydropyrans. Tetrahedron Lett 2012; 53:3699-3702. [PMID: 22753996 DOI: 10.1016/j.tetlet.2012.04.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
In situ-generated (bis-DPPMB)-Cu(OTf)(2) complex has been examined to catalyze a tandem olefin migration and Prins cyclization of an alkenol with various aldehydes. The reaction proceeded with electron-rich aromatic aldehydes at room temperature and provided functionalized tetrahydropyrans in good yields. An efficient synthesis of the bis-DPPMB ligand has also been described.
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Affiliation(s)
- Arun K Ghosh
- Department of Chemistry and Department of Medicinal Chemistry, Purdue University, 560 Oval Drive, West Lafayette, Indiana 47907, United States
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32
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Bunt AJ, Bailey CD, Cons BD, Edwards SJ, Elsworth JD, Pheko T, Willis CL. Bicyclic Oxygen Heterocycles from γ,δ-Unsaturated Alcohols: Synthetic Targets Inspired by Blepharocalyxin D. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201108315] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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33
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Bunt AJ, Bailey CD, Cons BD, Edwards SJ, Elsworth JD, Pheko T, Willis CL. Bicyclic Oxygen Heterocycles from γ,δ-Unsaturated Alcohols: Synthetic Targets Inspired by Blepharocalyxin D. Angew Chem Int Ed Engl 2012; 51:3901-4. [DOI: 10.1002/anie.201108315] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2011] [Indexed: 11/10/2022]
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34
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Saha P, Bhunia A, Saikia AK. Synthesis of 2,3,5,6-tetrasubstituted tetrahydropyrans via (3,5)-oxonium-ene reaction. Org Biomol Chem 2012; 10:2470-81. [DOI: 10.1039/c2ob06832j] [Citation(s) in RCA: 19] [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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