1
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Lu L, Lu P. Enantioselective [3+2]-cycloaddition of 2,3-disubstituted cyclobutenones: vicinal quaternary stereocenters construction and skeletal functionalization. Chem Sci 2023; 14:8355-8359. [PMID: 37564417 PMCID: PMC10411620 DOI: 10.1039/d3sc02485g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Accepted: 07/13/2023] [Indexed: 08/12/2023] Open
Abstract
Cycloaddition is a fundamental transformation, featuring the assembly of complex cyclic molecules with multiple stereocenters. We report here a silver-catalyzed [3+2]-cycloaddition of 2,3-disubstituted cyclobutenones with an array of azomethine ylide precursors iminoesters, furnishing azabicycles in good yields and enantioselectivities. Up to three contiguous all-carbon quaternary centers, including two angular stereocenters, could be constructed efficiently, due to high reactivity of strained cyclobutenones. Subsequent skeletal remodeling provided versatile molecules with distinct structural characters.
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Affiliation(s)
- Licheng Lu
- Research Center for Molecular Recognition and Synthesis, Department of Chemistry, Fudan University 220 Handan Lu Shanghai 200433 P. R. China
| | - Ping Lu
- Research Center for Molecular Recognition and Synthesis, Department of Chemistry, Fudan University 220 Handan Lu Shanghai 200433 P. R. China
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2
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Wahl JM, Tenberge M. Lewis Acid Catalysed Asymmetric One-Carbon Ring-Expansion of Prochiral Cyclobutanones. SYNTHESIS-STUTTGART 2022. [DOI: 10.1055/s-0042-1751386] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
AbstractEnantioselective methylene insertion into prochiral cyclobutanones is described providing access to chiral β-substituted cyclopentanones as important structural motif in synthesis and natural products. Commercially available trimethylsilyl as well as other silyl diazomethanes act as one-carbon synthon and scandium triflate is found to be a potent Lewis acid catalyst. By using bis(oxazoline) ligands, enantioinduction is achieved for a number of β-substituted cyclopentanones including examples bearing all-carbon quaternary stereocentres.
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Affiliation(s)
| | - Marius Tenberge
- Department Chemie, Johannes Gutenberg-Universität
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität
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3
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Chen S, Zhang Z, Jiang C, Zhao C, Luo H, Huang J, Yang Z. Stereoselective Synthesis of trans-Decalin-Based Spirocarbocycles via Photocyclization of 1,2-Diketones. ACS OMEGA 2021; 6:18848-18859. [PMID: 34337224 PMCID: PMC8320103 DOI: 10.1021/acsomega.1c02054] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/17/2021] [Accepted: 06/29/2021] [Indexed: 06/13/2023]
Abstract
Diastereoselective synthesis of the trans-decalin-based α-hydroxyl butanone spirocarbocycles bearing all-carbon quaternary stereogenic centers has been achieved via Norrish-Yang photocyclization of trans-decalin-substituted-2,3-butanediones using daylight. Density functional theory (DFT) calculations suggest that this diastereoselective reaction is affected by both substrate conformation and intramolecular hydrogen bonds. The developed chemistry could be applied to synthesizing the derivatives of the trans-decalin-based biologically important natural products.
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Affiliation(s)
- Sijia Chen
- State
Key Laboratory of Chemical Oncogenomics and Key Laboratory of Chemical
Genomics, Peking University Shenzhen Graduate
School, Shenzhen 518055, China
| | - Zhongchao Zhang
- State
Key Laboratory of Chemical Oncogenomics and Key Laboratory of Chemical
Genomics, Peking University Shenzhen Graduate
School, Shenzhen 518055, China
| | - Chongguo Jiang
- State
Key Laboratory of Chemical Oncogenomics and Key Laboratory of Chemical
Genomics, Peking University Shenzhen Graduate
School, Shenzhen 518055, China
| | - Chunbo Zhao
- State
Key Laboratory of Chemical Oncogenomics and Key Laboratory of Chemical
Genomics, Peking University Shenzhen Graduate
School, Shenzhen 518055, China
| | - Haojie Luo
- State
Key Laboratory of Chemical Oncogenomics and Key Laboratory of Chemical
Genomics, Peking University Shenzhen Graduate
School, Shenzhen 518055, China
| | - Jun Huang
- State
Key Laboratory of Chemical Oncogenomics and Key Laboratory of Chemical
Genomics, Peking University Shenzhen Graduate
School, Shenzhen 518055, China
| | - Zhen Yang
- State
Key Laboratory of Chemical Oncogenomics and Key Laboratory of Chemical
Genomics, Peking University Shenzhen Graduate
School, Shenzhen 518055, China
- Key
Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry
of Education and Beijing National Laboratory for Molecular Science
(BNLMS), and Peking-Tsinghua Center for Life Sciences, Peking University, Beijing 100871, China
- Shenzhen
Bay Laboratory, Shenzhen 518055, China
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4
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DeHovitz JS, Loh YY, Kautzky JA, Nagao K, Meichan AJ, Yamauchi M, MacMillan DWC, Hyster TK. Static to inducibly dynamic stereocontrol: The convergent use of racemic β-substituted ketones. Science 2020; 369:1113-1118. [PMID: 32855338 DOI: 10.1126/science.abc9909] [Citation(s) in RCA: 49] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Accepted: 07/07/2020] [Indexed: 12/16/2022]
Abstract
The synthesis of stereochemically complex molecules in the pharmaceutical and agrochemical industries requires precise control over each distinct stereocenter, a feat that can be challenging and time consuming using traditional asymmetric synthesis. Although stereoconvergent processes have the potential to streamline and simplify synthetic routes, they are currently limited by a narrow scope of inducibly dynamic stereocenters that can be readily epimerized. Here, we report the use of photoredox catalysis to enable the racemization of traditionally static, unreactive stereocenters through the intermediacy of prochiral radical species. This technology was applied in conjunction with biocatalysts such as ketoreductases and aminotransferases to realize stereoconvergent syntheses of stereodefined γ-substituted alcohols and amines from β-substituted ketones.
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Affiliation(s)
- Jacob S DeHovitz
- Merck Center for Catalysis, Princeton University, Princeton, NJ 08544, USA
| | - Yong Yao Loh
- Merck Center for Catalysis, Princeton University, Princeton, NJ 08544, USA
| | - Jacob A Kautzky
- Merck Center for Catalysis, Princeton University, Princeton, NJ 08544, USA
| | - Kazunori Nagao
- Merck Center for Catalysis, Princeton University, Princeton, NJ 08544, USA
| | - Andrew J Meichan
- Merck Center for Catalysis, Princeton University, Princeton, NJ 08544, USA
| | - Motoshi Yamauchi
- Merck Center for Catalysis, Princeton University, Princeton, NJ 08544, USA
| | | | - Todd K Hyster
- Merck Center for Catalysis, Princeton University, Princeton, NJ 08544, USA.
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5
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Yan P, Zhou Q, Chen J, Lu P. Controllable Skeleton Rearrangement of
3‐Substituted
Cyclobutanones under Basic Conditions
†. CHINESE J CHEM 2020. [DOI: 10.1002/cjoc.201900510] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Peng Yan
- Research Center for Molecular Recognition and Synthesis, Department of Chemistry, Fudan University 220 Handan Lu Shanghai 200433 China
| | - Qiang Zhou
- Research Center for Molecular Recognition and Synthesis, Department of Chemistry, Fudan University 220 Handan Lu Shanghai 200433 China
| | - Jun Chen
- Research Center for Molecular Recognition and Synthesis, Department of Chemistry, Fudan University 220 Handan Lu Shanghai 200433 China
| | - Ping Lu
- Research Center for Molecular Recognition and Synthesis, Department of Chemistry, Fudan University 220 Handan Lu Shanghai 200433 China
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6
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Synthesis and characterisation of a novel mixed donor P,O,P' nixantphos ligand and its metal complex. J Mol Struct 2016. [DOI: 10.1016/j.molstruc.2015.10.083] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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7
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O'Mahony GE, Eccles KS, Morrison RE, Ford A, Lawrence SE, Maguire AR. Investigation of steric and electronic effects in the copper-catalysed asymmetric oxidation of sulfides. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.08.063] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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8
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Yoshida M, Maeyama Y, Al-Amin M, Shishido K. Synthesis of Substituted 1,4,5,6-Tetrahydrocyclopenta[b]pyrroles by Platinum-Catalyzed Cascade Cyclization/Ring Expansion of 2-Alkynyl-1-azaspiro[2.3]hexanes. J Org Chem 2011; 76:5813-20. [DOI: 10.1021/jo201000f] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Masahiro Yoshida
- Graduate School of Pharmaceutical Sciences, The University of Tokushima, 1-78-1 Sho-machi, Tokushima 770-8505, Japan
| | - Yohei Maeyama
- Graduate School of Pharmaceutical Sciences, The University of Tokushima, 1-78-1 Sho-machi, Tokushima 770-8505, Japan
| | - Mohammad Al-Amin
- Graduate School of Pharmaceutical Sciences, The University of Tokushima, 1-78-1 Sho-machi, Tokushima 770-8505, Japan
| | - Kozo Shishido
- Graduate School of Pharmaceutical Sciences, The University of Tokushima, 1-78-1 Sho-machi, Tokushima 770-8505, Japan
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9
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Leemans E, D’hooghe M, De Kimpe N. Ring Expansion of Cyclobutylmethylcarbenium Ions to Cyclopentane or Cyclopentene Derivatives and Metal-Promoted Analogous Rearrangements. Chem Rev 2011; 111:3268-333. [DOI: 10.1021/cr100295j] [Citation(s) in RCA: 115] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Erika Leemans
- Department of Sustainable Organic Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium
| | - Matthias D’hooghe
- Department of Sustainable Organic Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium
| | - Norbert De Kimpe
- Department of Sustainable Organic Chemistry and Technology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium
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10
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Satoh T, Awata Y, Kato Y, Ogata S, Ishigaki M, Sugiyama S, Saitoh H. Synthesis, including asymmetric synthesis, of 1-substituted cyclopentenes from cyclobutanones with one-carbon ring-expansion by 1,2-carbon-carbon insertion of magnesium carbenoids. Tetrahedron 2011. [DOI: 10.1016/j.tet.2010.12.023] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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11
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Naso F, Capozzi M, Bottoni A, Calvaresi M, Bertolasi V, Capitelli F, Cardellicchio C. A Combined Theoretical and Experimental Investigation on the Enantioselective Oxidation of Aryl Benzyl Sulfides in the Presence of a Chiral Titanium Catalyst. Chemistry 2009; 15:13417-26. [DOI: 10.1002/chem.200902110] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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12
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He JQ, Shibata D, Ohno C, Okamoto S. Two-step allylic carbon insertion between ketone carbonyl and α carbons giving α-quaternary α-vinyl ketones. Tetrahedron Lett 2008. [DOI: 10.1016/j.tetlet.2008.09.068] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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13
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Katritzky AR, Bobrov S, Kirichenko K, Ji Y. General and efficient insertion of carbons carrying benzotriazole. J Org Chem 2004; 69:303-8. [PMID: 14725440 DOI: 10.1021/jo035098p] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Anions formed from the lithiation of 1-(1-benzotriazolylalkyl)benzotriazoles (1, 6) and 1-(1-methylthioalkyl)benzotriazoles (10 and 10a) with n-BuLi underwent additions to cyclic and acyclic ketones giving intermediates 3a-f, 7b-f, and 11b-d, respectively, in excellent yields. Thermal rearrangements of intermediates 3a,b,d-f and 7b-d,f in the presence of zinc bromide provided one-carbon chain-extended or ring-expanded alpha-benzotriazolyl ketones 4a,b,d-f and 8b-d,f in moderate yields with excellent regioselectivity. By contrast, intermediates 11b-d on treatment with zinc bromide loose a molecule of benzotriazole followed by intramolecular cyclization of the resulting intermediates 12b-d to provide the 2,3- and 1,2,3-substituted indenes 13b-d in good yields.
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Affiliation(s)
- Alan R Katritzky
- Center for Heterocyclic Compounds, University of Florida, Department of Chemistry, Gainesville, Florida 32611-7200, USA.
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14
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Zimmerman HE, Wang P. The α-Effect in the Stereochemistry of Kinetic Ketonization of Enols1,2. J Org Chem 2003; 68:9226-32. [PMID: 14629140 DOI: 10.1021/jo034732w] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Kinetic control of the stereoselectivity of protonation of enolates and other strongly delocalized anionic species is involved in a large number of organic reactions. Protonation occurring from the less hindered side of the, e.g., enolic system affords the less stable of two diastereomers. However, one apparent discrepancy has been in the synthesis of prostaglandins. The present research deals with the source of this behavior. A curious effect of the substituent at the enolic alpha carbon was uncovered. In certain instances an alpha substituent is forced to twist into a conformation blocking the proton donor from its side, thus reversing the stereochemistry of protonation. In the course of this research, a number of five-ring enols of varying structure were investigated. Finally, the ketonization reaction course has been studied theoretically.
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15
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Wang S, Kayser MM, Jurkauskas V. Access to optically pure 4- and 5-substituted lactones: a case of chemical-biocatalytical cooperation. J Org Chem 2003; 68:6222-8. [PMID: 12895054 DOI: 10.1021/jo026605q] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Optically pure or highly enantiomerically enriched 4- and 5-substituted lactones are rather difficult to obtain. Chemical or enzymatic syntheses alone are not particularly successful. A combination of chemical catalysis and biocatalysis, however, provides a convenient route to a variety of these useful chiral compounds. In this paper we describe the synthesis of several optically pure 4- and 5-substituted lactones obtained via whole cell-catalyzed Baeyer-Villiger oxidations of highly enantiomerically enriched 3-alkyl cyclic ketones. Such chiral ketones are readily accessed by recently developed copper-catalyzed asymmetric conjugate reductions of the corresponding enones. A very high proximal regioselectivity and complete chirality transfer was obtained by employing biological Baeyer-Villiger oxidations, using recombinant E. coli strains that overexpress cyclopentanone monooxygenase (CPMO). A comparative study showed that CPMO gives superior results to those obtained with cyclohexanone monooxygenase (CHMO) catalyzed oxidations.
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Affiliation(s)
- Shaozhao Wang
- Department of Physical Sciences, University of New Brunswick, Saint John, NB E2L 4L5, Canada
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16
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Namyslo JC, Kaufmann DE. The application of cyclobutane derivatives in organic synthesis. Chem Rev 2003; 103:1485-537. [PMID: 12683789 DOI: 10.1021/cr010010y] [Citation(s) in RCA: 525] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jan C Namyslo
- Institut für Organische Chemie, Technische Universität Clausthal, 38678 Clausthal-Zellerfeld, Germany
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17
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Use of native and derivatized cyclodextrin chiral stationary phases for the enantioseparation of aromatic and aliphatic sulfoxides by high performance liquid chromatography. Chromatographia 2002. [DOI: 10.1007/bf02493200] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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18
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Anderson JL, Ding J, McCulla RD, Jenks WS, Armstrong DW. Separation of racemic sulfoxides and sulfinate esters on four derivatized cyclodextrin chiral stationary phases using capillary gas chromatography. J Chromatogr A 2002; 946:197-208. [PMID: 11873969 DOI: 10.1016/s0021-9673(01)01526-6] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The separation of 17 chiral sulfoxides and eight chiral sulfinate esters by gas chromatography (GC) on four derivatized cyclodextrin chiral stationary phases (CSPs) (Chiraldex G-TA, G-BP, G-PN, B-DM) is presented. Many of these compounds are structural isomers or part of a homologous series. Differences in enantioselectivity of the methyl phenyl sulfoxide isomers on the derivatized gamma cyclodextrin and the heptakis 2,6-di-O-methyl-beta-cyclodextrin (i.e. B-DM) CSPs are discussed. Under the conditions of this study, the molecular mass cut-off for the GC separation of these compounds was approximately 230. Compounds of higher molecular mass were not eluted from the CSPs at reasonable times and temperatures, but these higher molecular mass enantiomers can be separated by liquid chromatography and capillary electrophoresis. The enantiomeric separation and elution order of a sulfinate ester containing two stereogenic centers as well as 15 chiral sulfoxides is presented. The G-TA and B-DM CSPs generally gave opposite elution orders for most of the compounds studied.
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19
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A simple, user-friendly process for the homologation of aldehydes using tosylhydrazone salts. Tetrahedron Lett 2000. [DOI: 10.1016/s0040-4039(00)01856-6] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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20
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Brown B, Hegedus LS. A novel, one-pot ring expansion of cyclobutanones. Syntheses of carbovir and aristeromycin. J Org Chem 2000; 65:1865-72. [PMID: 10750497 DOI: 10.1021/jo9919759] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A novel, one-pot ring-expansion procedure was developed using Me3S(O)I, NaH, and Sc(OTf)3. The scope and limitations were briefly examined, and a tentative mechanism was proposed. Application of the methodology to known cyclobutanone 1 provided the corresponding cyclopentanone, which was successfully advanced to (+)-carbovir and (+)-aristeromycin.
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Affiliation(s)
- B Brown
- Department of Chemistry, Colorado State University, Fort Collins 80523, USA
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21
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Shim PJ, Kim HD. 1,3-Asymmetric induction in the intramolecular [2+2] cycloaddition of alkene-keteniminium salts. Synthesis of (+)-gibberellic acid key intermediate. Tetrahedron Lett 1998. [DOI: 10.1016/s0040-4039(98)02228-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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22
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Katritzky AR, Toader D, Xie L. General and Efficient Insertions of Carbons Carrying Aryl and Heteroaryl Groups: Synthesis of alpha-Aryl- and alpha-Heteroaryl-Substituted Ketones. J Org Chem 1996; 61:7571-7577. [PMID: 11667690 DOI: 10.1021/jo960841h] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Anions formed from the lithiation of a variety of 1-(arylmethyl)- and 1-(heteroarylmethyl)benzotriazoles 1 with n-BuLi underwent addition to aliphatic and aromatic aldehydes and cyclic and acyclic ketones. Subsequent in situ thermal rearrangements of the intermediates in the presence of zinc bromide provided one-carbon chain-extended or ring-expanded alpha-aryl- and alpha-heteroaryl-substituted ketones 2 in moderate to excellent yields in simple one-pot operations with excellent regioselectivity in most cases. Substituent effects on the relative migration rates were investigated in the insertion reactions of 1-(4-methoxybenzyl)benzotriazole (1e) with XC(6)H(4)COPh. The small and negative Hammett rho(+) value (-0.92) suggested that the rearrangements proceed via early, reagent-like, electron deficient transition states.
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Affiliation(s)
- Alan R. Katritzky
- Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200
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23
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Murakami M, Amii H, Shigeto K, Ito Y. Breaking of the C−C Bond of Cyclobutanones by Rhodium(I) and Its Extension to Catalytic Synthetic Reactions. J Am Chem Soc 1996. [DOI: 10.1021/ja9604525] [Citation(s) in RCA: 175] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Masahiro Murakami
- Contribution from the Department of Synthetic Chemistry and Biological Chemistry, Kyoto University, Yoshida, Kyoto 606-01, Japan
| | - Hideki Amii
- Contribution from the Department of Synthetic Chemistry and Biological Chemistry, Kyoto University, Yoshida, Kyoto 606-01, Japan
| | - Kunji Shigeto
- Contribution from the Department of Synthetic Chemistry and Biological Chemistry, Kyoto University, Yoshida, Kyoto 606-01, Japan
| | - Yoshihiko Ito
- Contribution from the Department of Synthetic Chemistry and Biological Chemistry, Kyoto University, Yoshida, Kyoto 606-01, Japan
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24
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Murakami M, Amii H, Ito Y. Selective activation of carbon–carbon bonds next to a carbonyl group. Nature 1994. [DOI: 10.1038/370540a0] [Citation(s) in RCA: 254] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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25
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García Martínez A, Vilar ET, Barcina JO, Alonso JM, Rodríguez Herrero E, Hanack M, Subramanian L. Enantiospecific synthesis of 3-substituted alkylidinecyclopentanes. Tetrahedron Lett 1992. [DOI: 10.1016/s0040-4039(00)92322-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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26
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Belluš D, Ernst B. Cyclobutanone und Cyclobutenone in der Natur und in der Synthese. Angew Chem Int Ed Engl 1988. [DOI: 10.1002/ange.19881000607] [Citation(s) in RCA: 67] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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27
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Bellu? D, Ernst B. Cyclobutanones and Cyclobutenones in Nature and in Synthesis [New Synthetic Methods(71)]. ACTA ACUST UNITED AC 1988. [DOI: 10.1002/anie.198807971] [Citation(s) in RCA: 215] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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28
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Cooperative [2+2+2] cycloaddition reactions in polyquadricyclanylidene [n]rotanes - model studies in tris-spiro(C7H6) systems. Tetrahedron Lett 1987. [DOI: 10.1016/s0040-4039(00)96522-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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