1
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Yalduz S, Yilmaz M. Microwave Assisted Synthesis of 2,3‐Dihydro‐4
H
‐ furo[2,3‐
d
]pyrido[1,2‐
a
]pyrimidin‐4‐ones and furo[2,3‐
d
]pyrido[1,2‐
a
]pyrimidin‐4‐one. ChemistrySelect 2023. [DOI: 10.1002/slct.202204260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/09/2023]
Affiliation(s)
- Sümeyye Yalduz
- Department of Chemistry Faculty of Arts and Sciences Kocaeli University 41380 Umuttepe Kocaeli Turkey
| | - Mehmet Yilmaz
- Department of Chemistry Faculty of Arts and Sciences Kocaeli University 41380 Umuttepe Kocaeli Turkey
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2
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Hajiloo Shayegan M, Li ZY, Cui X. Ligand-Controlled Regiodivergence for Catalytic Stereoselective Semireduction of Allenamides. Chemistry 2021; 28:e202103402. [PMID: 34693580 DOI: 10.1002/chem.202103402] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Indexed: 11/10/2022]
Abstract
Ligand-controlled regiodivergence has been developed for catalytic semireduction of allenamides with excellent chemo- and stereocontrol. This system also provides an example of catalytic regiodivergent semireduction of allenes for the first time. The divergence of the semireduction is enabled by ligand switch with the same palladium pre-catalyst under operationally simple and mild conditions. Monodentate ligand XPhos exclusively promotes selective 1,2-semireduction to afford allylic amides, while bidentate ligand BINAP completely switched the regioselectivity to 2,3-semireduction, producing (E)-enamide derivatives.
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Affiliation(s)
| | - Zhong-Yuan Li
- Department of Chemistry, Mississippi State University, Mississippi State, MS 39762, USA
| | - Xin Cui
- Department of Chemistry, Mississippi State University, Mississippi State, MS 39762, USA
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3
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Xiong W, Xu G, Yu X, Tang W. P-Chiral Monophosphorus Ligands for Asymmetric Copper-Catalyzed Allylic Alkylation. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00194] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Wenrui Xiong
- Shanghai Key Laboratory of New Drug Design, School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai 200037, China
| | - Guangqing Xu
- State Key Laboratory of Bio-Organic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Xinhong Yu
- Shanghai Key Laboratory of New Drug Design, School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai 200037, China
| | - Wenjun Tang
- Shanghai Key Laboratory of New Drug Design, School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai 200037, China
- State Key Laboratory of Bio-Organic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
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4
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Chang MY, Chen HY, Wang HS. Regiocontrolled Synthesis of α-Sulfonylmethyl o-Nitrostyrenes via ZnI 2-Mediated Sulfonylation and AgNO 2/Pd(PPh 3) 4-Promoted o-Nitration. J Org Chem 2017; 82:10601-10610. [PMID: 28926711 DOI: 10.1021/acs.joc.7b02311] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We report herein the AgNO2/Pd(PPh3)4-promoted regiocontrolled o-nitration of α-sulfonylmethylstyrenes in MeNO2 with good yields. The o-nitration process provides a series of sulfonyl o-nitrostyrenes. Substituted α-sulfonylmethylstyrenes were synthesized from ZnI2-mediated sulfonylation of substituted α-methylstyrenes and sodium sulfinates (RSO2Na) in MeCN with good to excellent yields. The structures of the key products were confirmed by X-ray crystallography. A plausible mechanism has been proposed herein.
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Affiliation(s)
- Meng-Yang Chang
- Department of Medicinal and Applied Chemistry, Kaohsiung Medical University Hospital, Kaohsiung Medical University , Kaohsiung 807, Taiwan
| | - Han-Yu Chen
- Department of Medicinal and Applied Chemistry, Kaohsiung Medical University Hospital, Kaohsiung Medical University , Kaohsiung 807, Taiwan
| | - Heui-Sin Wang
- Department of Medicinal and Applied Chemistry, Kaohsiung Medical University Hospital, Kaohsiung Medical University , Kaohsiung 807, Taiwan
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5
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Kondoh A, Kamata Y, Terada M. Synthesis of Enantioenriched γ-Amino-α,β-unsaturated Esters Utilizing Palladium-Catalyzed Rearrangement of Allylic Carbamates for Direct Application to Formal [3 + 2] Cycloaddition. Org Lett 2017; 19:1682-1685. [DOI: 10.1021/acs.orglett.7b00471] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Azusa Kondoh
- Research and Analytical Center for Giant Molecules, Graduate School
of Science and ‡Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
| | - Yuji Kamata
- Research and Analytical Center for Giant Molecules, Graduate School
of Science and ‡Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
| | - Masahiro Terada
- Research and Analytical Center for Giant Molecules, Graduate School
of Science and ‡Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
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6
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Park C, Ha MW, Kim B, Hong S, Kim D, Park Y, Kim MH, Lee JK, Lee J, Park HG. Enantioselective α-Alkylation of Benzylideneaminotert-Butyl Malonates by Phase-Transfer Catalysis. Adv Synth Catal 2015. [DOI: 10.1002/adsc.201500560] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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7
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Naveen T, Kancherla R, Maiti D. Radical Based Strategy toward the Synthesis of 2,3-Dihydrofurans from Aryl Ketones and Aromatic Olefins. Org Lett 2014; 16:5446-9. [DOI: 10.1021/ol502688r] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Togati Naveen
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Rajesh Kancherla
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Debabrata Maiti
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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8
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Markitanov YM, Timoshenko VM, Shermolovich YG. β-Keto sulfones: preparation and application in organic synthesis. J Sulphur Chem 2013. [DOI: 10.1080/17415993.2013.815749] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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9
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Facile domino reactions for the stereoselective assembly of highly functionalized bis-(trans-2,3-dihydrofuranyl) sulfides. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.03.088] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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10
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Ha MW, Lee H, Yi HY, Park Y, Kim S, Hong S, Lee M, Kim MH, Kim TS, Park HG. Enantioselective Phase-Transfer Catalytic α-Benzylation and α-Allylation of α-tert-Butoxycarbonyllactones. Adv Synth Catal 2013. [DOI: 10.1002/adsc.201200976] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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11
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Yu H, Han J, Chen J, Deng H, Shao M, Zhang H, Cao W. Preparation of (E)-4-Aryl-1,1,1-trifluoro-3-tosylbut-3-en-2-ones as Fluorinated Building Blocks and Their Application in Ready and Highly Stereoselective Routes to trans-2,3-Dihydrofurans Substituted with Trifluoromethyl and Sulfonyl Groups. European J Org Chem 2012. [DOI: 10.1002/ejoc.201200180] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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12
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Zhang J, Yang S, Zhang K, Chen J, Deng H, Shao M, Zhang H, Cao W. An efficient and highly stereoselective synthesis of novel trifluoromethylated trans-dihydrofuro[2,3-c]pyrazoles using arsonium ylides. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.01.030] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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13
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Xie JW, Li P, Wang T, Zhou FT. Efficient and mild synthesis of functionalized 2,3-dihydrofuran derivatives via domino reaction in water. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2011.02.093] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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14
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Hong S, Lee J, Kim M, Park Y, Park C, Kim MH, Jew SS, Park HG. Highly enantioselective synthesis of α,α-dialkylmalonates by phase-transfer catalytic desymmetrization. J Am Chem Soc 2011; 133:4924-9. [PMID: 21388212 DOI: 10.1021/ja110349a] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A novel enantioselective synthetic method for the construction of a quaternary carbon center from malonates via phase-transfer catalytic (PTC) alkylation has been developed. The asymmetric α-alkylation of diphenylmethyl tert-butyl α-alkylmalonates with alkylating agents under phase-transfer catalysis conditions (aq 50% KOH, toluene, 0 °C) in the presence of (S,S)-3,4,5-trifluorophenyl-NAS bromide (8) as PTC catalyst afforded the corresponding α,α-dialkylmalonates in high chemical (up to 99%) and optical yields (up to 97% ee) which could be readily converted to versatile chiral intermediates. Notably, the direct double α-alkylations of diphenylmethyl tert-butyl malonate also provided the corresponding α,α-dialkylmalonates without loss of enantioselectivity. The synthetic potential of this method has been demonstrated by the preparation of α,α-dialkylamino acid and oxindole systems.
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Affiliation(s)
- Suckchang Hong
- Research Institute of Pharmaceutical Sciences and College of Pharmacy, Seoul National University, Seoul 151-742, Korea
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15
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Yamazaki Y, Kakuma K, Du Y, Saito S. Synthesis of carbonates directly from 1 atm CO2 and alcohols using CH2Cl2. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.10.051] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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16
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Fan LP, Li P, Li XS, Xu DC, Ge MM, Zhu WD, Xie JW. Facile Domino Access to Chiral Mono-, Bi-, and Tricyclic 2,3-Dihydrofurans. J Org Chem 2010; 75:8716-9. [PMID: 21090776 DOI: 10.1021/jo101935k] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Li-Ping Fan
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Department of Chemistry and Life Science, Zhejiang Normal University, 321004 Jinhua, P. R. China
| | - Ping Li
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Department of Chemistry and Life Science, Zhejiang Normal University, 321004 Jinhua, P. R. China
| | - Xin-Sheng Li
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Department of Chemistry and Life Science, Zhejiang Normal University, 321004 Jinhua, P. R. China
| | - Dong-Cheng Xu
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Department of Chemistry and Life Science, Zhejiang Normal University, 321004 Jinhua, P. R. China
| | - Meng-Meng Ge
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Department of Chemistry and Life Science, Zhejiang Normal University, 321004 Jinhua, P. R. China
| | - Wei-Dong Zhu
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Department of Chemistry and Life Science, Zhejiang Normal University, 321004 Jinhua, P. R. China
| | - Jian-Wu Xie
- Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Department of Chemistry and Life Science, Zhejiang Normal University, 321004 Jinhua, P. R. China
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17
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Alfaro R, Yuste F, Ortiz B, Sánchez-Obregón R, García Ruano JL. γ-Amino vinyl sulfoxides in asymmetric synthesis. Synthesis of optically pure α-substituted β-amino nitriles. Tetrahedron 2009. [DOI: 10.1016/j.tet.2008.10.037] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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18
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Zhang R, Liang Y, Zhou G, Wang K, Dong D. Ring-enlargement of dimethylaminopropenoyl cyclopropanes: an efficient route to substituted 2,3-dihydrofurans. J Org Chem 2008; 73:8089-92. [PMID: 18798678 DOI: 10.1021/jo801289p] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A convenient and efficient synthesis of substituted dihydrofurans is developed via ring-enlargement of 1-dimethylaminopropenoyl-1-carbamoyl/benzoyl cyclopropanes catalyzed by ammonium acetate in acetic acid with high regio- and stereoselectivity. Some of the newly synthesized substituted dihydrofurans are subjected to further synthetic transformation in the presence of NaOH (aq) in ethanol to afford the corresponding 5-aryl-2,3-dihydrofuro[3,2-c]pyridin-4(5H)-ones in high yields.
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Affiliation(s)
- Rui Zhang
- Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China
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19
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JIANG HY, CAO WG, ZHANG H, SUN RS, CHEN J, DENG HM, SHAO M, ZHU SZ. Stereoselective Synthesis oftrans-2-Thien-α-oyl-3- [(un)substituted phenyl]-4-acetyl-5-methyl-2,3-dihydrofurans. CHINESE J CHEM 2008. [DOI: 10.1002/cjoc.200890137] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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20
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Zhang H, Cao WG, Chen J, Hu JR, Qian JX, Zhu SZ. Highly Stereoselective Synthesis of trans-3-Aryl-4-carbethoxy-2,3-dihydro-2-fur-2′-oyl-5-methylfurans. CHINESE J CHEM 2007. [DOI: 10.1002/cjoc.200790188] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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21
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Affiliation(s)
- I. Forristal
- a Chemistry Department , King Fahd University of Petroleum & Minerals , P.O. Box 1835, Dhahran, 31261, Saudi Arabia
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22
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Ma S, Zheng Z, Jiang X. Pd(0)-Catalyzed Coupling−Cyclization of 2-(2‘,3‘-Allenyl)acetylacetates and Organic Halides: An Efficient Synthesis of 4,5-Dihydrofuran Derivatives. Org Lett 2007; 9:529-31. [PMID: 17249804 DOI: 10.1021/ol0628917] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text] Highly chemo- and regioselective Pd(0)-catalyzed coupling-cyclization of 2-(2',3'-allenyl)acetylacetates with organic halides using K3PO4 as base in DMF efficiently afforded 4,5-dihydrofuran derivatives in moderate to excellent yields, with a selectivity of >97:3.
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Affiliation(s)
- Shengming Ma
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Lu, Shanghai 200032, P. R. China.
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23
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Gais HJ. Development of new methods for asymmetric synthesis based on sulfoximines. HETEROATOM CHEMISTRY 2007. [DOI: 10.1002/hc.20331] [Citation(s) in RCA: 108] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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24
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Krafft ME, Kyne GM, Hirosawa C, Schmidt P, Abboud KA, L'Helias N. An approach to triquinane synthesis using the Pauson–Khand reaction. Tetrahedron 2006. [DOI: 10.1016/j.tet.2006.09.022] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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25
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Fox DJ, Parris S, Pedersen DS, Tyzack CR, Warren S. Asymmetric synthesis of cyclopropanes and dihydrofurans based on phosphine oxide chemistry. Org Biomol Chem 2006; 4:3108-12. [PMID: 16886078 DOI: 10.1039/b606874j] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The asymmetric synthesis of gamma-azido trans-cyclopropyl ketones is accomplished via a short, simple and efficient sequence. The cyclopropanation step is achieved by an intramolecular nucleophilic ring closure, with a diphenylphosphinate leaving group, to give trans-cyclopropane exclusively. beta-Keto-diphenylphosphine oxides cyclise to form optically active dihydrofurans. All possible diastereoisomers of dihydrofurans can be prepared selectively starting from the same olefin.
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Affiliation(s)
- David J Fox
- University Chemical Laboratory, Lensfield Road, Cambridge, UKCB2 1EW.
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26
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Bernard AM, Frongia A, Piras PP, Secci F, Spiga M. Regioselective Synthesis of Trisubstituted 2,3-Dihydrofurans from Donor−Acceptor Cyclopropanes or from Reaction of the Corey Ylide with α-Sulfenyl-, α-Sulfinyl-, or α-Sulfonylenones. Org Lett 2005; 7:4565-8. [PMID: 16209480 DOI: 10.1021/ol0514606] [Citation(s) in RCA: 91] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reactions: see text] Regioselective synthesis of 2,4,5- or 3,4,5-trisubstituted 2,3-dihydrofurans has been realized by using donor-acceptor cyclopropanes or by a Corey ylide reaction with alpha-sulfenyl-, alpha-sulfinyl-, or alpha-sulfonylenones. The method allowed a straightforward synthesis of the natural product calyxolane B.
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Affiliation(s)
- Angela M Bernard
- Dipartimento di Scienze Chimiche, Università degli studi di Cagliari, Cittadella Universitaria di Monserrato, S.S 554, Bivio per Sestu, I-09042 Monserrato (Cagliari), Italy
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27
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Palladium-catalyzed asymmetric synthesis of allylic alcohols from unsymmetrical and symmetrical racemic allylic carbonates featuring C–O-bond formation and dynamic kinetic resolution. Tetrahedron Lett 2005. [DOI: 10.1016/j.tetlet.2005.07.044] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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28
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Gais HJ, Reddy LR, Babu GS, Raabe G. Asymmetric Synthesis of 2,3-Dihydrofurans and of Unsaturated Bicyclic Tetrahydrofurans through α-Elimination and Migratory Cyclization of Silyloxy Alkenyl Aminosulfoxonium Salts. Generation and Intramolecular O,Si-Bond Insertion of Chiral Disubstituted β-Silyloxy Alkylidene Carbenes. J Am Chem Soc 2004; 126:4859-64. [PMID: 15080690 DOI: 10.1021/ja030501v] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Treatment of the bis(allylsulfoximine)titanium complexes derived from the beta-methyl-substituted acyclic allylic sulfoximines 13a and 13b with aldehydes gave with high selectivities the corresponding sulfoximine-substituted homoallylic alcohols which were isolated as the silyl ethers 15a-h. Methylation of sulfoximines 15a-h afforded the aminosulfoxonium salts 5a-h which upon treatment with LiN(H)tBu gave in high yields the enantio- and diastereomerically pure silyl-substituted 2,3-dihydrofurans 4a-h. Treatment of the titanium complexes derived from the cyclic allylic sulfoximines 17a, 17b, and ent-17c with p-MeOC(6)H(4)CHO delivered with high selectivities the corresponding sulfoximine-substituted cyclic homoallylic alcohols which were isolated as the silyl ethers 18a, 18b, and ent-18c, respectively. Methylation of sulfoximines 18a, 18b, and ent-18c furnished the aminosulfoxonium salts 8a, 8b, and ent-8c, respectively, whose treatment with LiN(H)t-Bu gave the enantio- and diastereomerically pure fused bicyclic 2,3-dihydrofurans 6a, 6b, and ent-6c, respectively, in good yields. It is proposed that the 1-alkenyl aminosulfoxonium salts 5a-h, 8a, 8b, and ent-8c react with the base under alpha-elimination and formation of the acyclic and cyclic beta-silyloxy alkylidene carbenes 2a-h, 7a, 7b, and ent-7c, respectively, which then undergo a 1,5-O,Si-bond insertion and 1,2-silyl migration. The cyclic aminosulfoxonium salts 8a, 8b, and ent-8c upon treatment with 1,8-diazabicyclo[5.4.0]-7-undecene did not undergo an alpha-elimination but suffered a novel migratory cyclization with formation of the enantio- and diastereomerically pure bicyclic tetrahydrofurans 9a, 9b, and ent-9c, respectively. It is proposed that the 1-alkenyl sulfoxonium salts 8a, 8b, and ent-8c are isomerized to the allylic aminosulfoxonium salts 10a, 10b, and ent-10c, respectively, which then suffer an intramolecular substitution of the (dimethylamino)sulfoxonium group by the silyloxy group followed by a desilylation. The syntheses of the 2,3-dihydrofurans 4a-h, 6a, and 6b and of the tetrahydrofurans 9a and 9b are accompanied by the formation of sulfinamide 16 of >or=98% ee, which can be converted via sulfoxide 28 of >or=98% to the starting sulfoximine 11 of >or=98% ee.
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Affiliation(s)
- Hans-Joachim Gais
- Institut für Organische Chemie der Rheinisch-Westfälischen Technischen Hochschule (RWTH) Aachen, Prof.-Pirlet-Strasse 1, D-52056 Aachen, Germany.
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29
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Vicinal dianions of diethyl α-aroylsuccinates: preparation of functionalized-2,3-dihydrofurans and -furans, and diaxial 2,4-diaryl-3,7-dioxabicyclo[3.3.0]octanes. Tetrahedron Lett 2003. [DOI: 10.1016/j.tetlet.2003.09.005] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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30
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Calò V, Scordari F, Nacci A, Schingaro E, D'Accolti L, Monopoli A. Stereoselective synthesis of tetrasubstituted 2,3-dihydrofurans by one-step cyclization of beta-ketosulfides of benzothiazole and aldehydes in ionic liquids. J Org Chem 2003; 68:4406-9. [PMID: 12762744 DOI: 10.1021/jo026849a] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A stereoselective synthesis of tetrasubstituted 2,3-dihydrofurans was carried out in n-butylpyridinium tetrafluoroborate ([bpy(+)][BF(4)(-)]) as solvent. The reaction proceeds smoothly in one step starting from simple materials such as aldehydes and beta-ketosulfides of benzothiazole. A comparison between several ionic liquids (ILs) is presented, and the role of the benzothiazolyl moiety is discussed. Workup proved to be very easy and recycling of IL possible.
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Affiliation(s)
- Vincenzo Calò
- Istituto di Chimica dei Composti Organometallici - ICCOM, Department of Chemistry, University of Bari, Via Amendola 173, Italy
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31
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Diastereoselective synthesis of 4,5-dihydrofurans by iodoenolcyclisation of 2-allyl-1,3-dicarbonyl compounds. Tetrahedron 2002. [DOI: 10.1016/s0040-4020(02)01064-5] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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