1
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Ni H, Wong YL, Wu M, Han Z, Ding K, Lu Y. Highly Enantioselective [3 + 2] Annulation of 3-Butynoates with β-Trifluoromethyl Enones Promoted by an Amine-Phosphine Binary Catalytic System. Org Lett 2020; 22:2460-2463. [PMID: 32155074 DOI: 10.1021/acs.orglett.0c00681] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
We report a highly enantioselective [3 + 2] annulation between 3-butynoates and β-trifluoromethyl enones, furnishing trifluoromethylated cyclopentenes with three contiguous stereogenic centers in good yields, high diastereoselectivities, and excellent enantioselectivities. A unique catalytic system consisting of a simple amine and a chiral phosphine was devised, and the synergistic play of Lewis basic amine and phosphine was crucial for alkyne isomerization and subsequent cyclization. The protocol disclosed herein allows facile activation of 3-butynoates in phosphine-mediated asymmetric transformations.
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Affiliation(s)
- Huanzhen Ni
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543, Singapore
| | - Yee Lin Wong
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543, Singapore
| | - Mingyue Wu
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543, Singapore
| | - Zhaobin Han
- State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Kuiling Ding
- State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
| | - Yixin Lu
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, 117543, Singapore.,Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Binhai New City, Fuzhou, Fujian 359297, PR China.,National University of Singapore (Suzhou) Research Institute, 377 Lin Quan Street, Suzhou Industrial Park, Suzhou, Jiangsu, PR China, 215123
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2
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Affiliation(s)
- Quan Cai
- Department of Chemistry and Research Center for Molecular Recognition and SynthesisFudan University, 220 Handan Rd Shanghai 200433 China
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3
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Suzuki I, Esumi N, Yasuda M, Baba A. GaBr3-catalyzed Coupling between α-Iodo Esters with Alkynylstannanes under UV Irradiation. CHEM LETT 2015. [DOI: 10.1246/cl.140888] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Itaru Suzuki
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University
| | - Naoto Esumi
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University
| | - Makoto Yasuda
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University
| | - Akio Baba
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University
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4
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Khatri AI, Samant SD. Unusual tandem sequence of oxa Diels–Alder reaction, retro Diels–Alder reaction, and oxa 6π-electrocyclic ring opening in the reaction of 6-amino-4-(4-methoxyphenyl)-2H-pyran-2-ones with benzaldehydes. RSC Adv 2015. [DOI: 10.1039/c4ra13374a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The oxa Diels–Alder reaction of 6-amino-4-(4-methoxyphenyl)-2H-pyran-2-ones with benzaldehydes took an unusual path whereby an unexpected tandem sequence of three reactions yielded 3-(4-methoxyphenyl)-5-phenyl-1-(piperidin-1-yl/pyrrolidin-1-yl)penta-2,4-dien-1-ones.
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Affiliation(s)
- Adil I. Khatri
- Department of Chemistry
- Institute of Chemical Technology
- India
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5
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Heinrich CF, Miesch M, Miesch L. In situ intramolecular catalytic 1,2-addition of allenoates to cyclic ketones towards polycyclic allenoates. Org Biomol Chem 2015; 13:2153-6. [DOI: 10.1039/c4ob02451f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Sequential deprotonation, isomerization of 3-alkynoates and subsequent 1,2-addition led to bicyclic allenoate in the presence of a catalytic amount of Cs2CO3.
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Affiliation(s)
- Clément F. Heinrich
- Université de Strasbourg
- Institut de Chimie
- UMR Unistra-CNRS 7177
- Laboratoire de Chimie Organique Synthétique
- 67008-Strasbourg
| | - Michel Miesch
- Université de Strasbourg
- Institut de Chimie
- UMR Unistra-CNRS 7177
- Laboratoire de Chimie Organique Synthétique
- 67008-Strasbourg
| | - Laurence Miesch
- Université de Strasbourg
- Institut de Chimie
- UMR Unistra-CNRS 7177
- Laboratoire de Chimie Organique Synthétique
- 67008-Strasbourg
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6
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Zhang FG, Wei Y, Yi YP, Nie J, Ma JA. Regioselective Cycloaddition of Trifluorodiazoethane with Electron-Deficient Allenic Esters and Ketones: Access to CF3-Substituted Pyrazolines and Pyrazoles. Org Lett 2014; 16:3122-5. [DOI: 10.1021/ol501249h] [Citation(s) in RCA: 102] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Fa-Guang Zhang
- Department of
Chemistry, Key Laboratory of Systems Bioengineering (the Ministry
of Education), Tianjin University and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, P. R. China
| | - Yi Wei
- Department of
Chemistry, Key Laboratory of Systems Bioengineering (the Ministry
of Education), Tianjin University and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, P. R. China
| | - Yu-Ping Yi
- Department of
Chemistry, Key Laboratory of Systems Bioengineering (the Ministry
of Education), Tianjin University and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, P. R. China
| | - Jing Nie
- Department of
Chemistry, Key Laboratory of Systems Bioengineering (the Ministry
of Education), Tianjin University and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, P. R. China
| | - Jun-An Ma
- Department of
Chemistry, Key Laboratory of Systems Bioengineering (the Ministry
of Education), Tianjin University and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, P. R. China
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7
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Wang C, Goh CMT, Xiao S, Ye W, Tan CH. Enantioselective Protonation Catalyzed by Chiral Br^|^oslash;nsted Bases. J SYN ORG CHEM JPN 2013. [DOI: 10.5059/yukigoseikyokaishi.71.1145] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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8
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Abd-Alla HI, Abu-Gabal NS, Hassan AZ, El-Safty MM, Shalaby NMM. Antiviral activity of Aloe hijazensis against some haemagglutinating viruses infection and its phytoconstituents. Arch Pharm Res 2012; 35:1347-54. [PMID: 22941477 PMCID: PMC7090512 DOI: 10.1007/s12272-012-0804-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2011] [Revised: 11/16/2011] [Accepted: 11/22/2011] [Indexed: 11/23/2022]
Abstract
Evaluation of the antiviral activities of flowers, flower-peduncles, leaves, and roots of Aloe hijazensis against haemagglutinating viruses of avian paramyxovirus type-1 (APMV-1), avian influenza virus type A (AI-H5N1), Newcastle disease virus (NDV), and egg-drop syndrome virus (EDSV) in specific pathogen free (SPF) chicken embryos were carried out. Extract of the flowers and leaves showed relatively higher activity than the extracts of other plant parts. Thirteen compounds were isolated from both the flowers and flower-peduncles of A. hijazensis. The isolated compounds were classified into: five anthraquinones; ziganein, ziganein-5-methyl ether, aloesaponarin I, chrysophanol, aloe-emodin, one dihydroisocoumarin; feralolide, four flavonoids; homoplantaginin, isoorientin, luteolin 7-glucuronopyranoside, isovitexin, one phenolic acid; p-coumaric acid, the anthrone; barbaloin together with aloenin. Eleven compounds were attributed to the flowers and seven to the flower-peduncles. Homoplantaginin and luteolin 7-glucuronopyranoside are reported here for the first time from Aloe spp. To the best of our knowledge, this is the first report on the chemical composition and biological activity of those plant parts.
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Affiliation(s)
- Howaida I Abd-Alla
- Department of Natural Compounds Chemistry, National Research Centre, Dokki, 12622, Giza, Egypt.
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9
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Cheong PHY, Legault CY, Um JM, Çelebi-Ölçüm N, Houk KN. Quantum mechanical investigations of organocatalysis: mechanisms, reactivities, and selectivities. Chem Rev 2011; 111:5042-137. [PMID: 21707120 PMCID: PMC3154597 DOI: 10.1021/cr100212h] [Citation(s) in RCA: 429] [Impact Index Per Article: 33.0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Paul Ha-Yeon Cheong
- Oregon State University, Department of Chemistry, 153 Gilbert Hall, Corvallis, OR 97331-4003 USA
| | - Claude Y. Legault
- University of Sherbrooke, Department of Chemistry, 2500 boul. de l’Université, local D1-3029, Sherbrooke (Québec) J1K 2R1 CANADA
| | - Joann M. Um
- University of California Los Angeles, Department of Chemistry and Biochemistry, 607 Charles E. Young Drive East, Los Angeles, CA 90095-1569 USA
| | - Nihan Çelebi-Ölçüm
- University of California Los Angeles, Department of Chemistry and Biochemistry, 607 Charles E. Young Drive East, Los Angeles, CA 90095-1569 USA
| | - K. N. Houk
- University of California Los Angeles, Department of Chemistry and Biochemistry, 607 Charles E. Young Drive East, Los Angeles, CA 90095-1569 USA
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10
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Hassink M, Liu X, Fox JM. Copper-catalyzed synthesis of 2,4-disubstituted allenoates from α-diazoesters. Org Lett 2011; 13:2388-91. [PMID: 21486078 DOI: 10.1021/ol2006242] [Citation(s) in RCA: 82] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A Cu-catalyzed method for coupling α-substituted-α-diazoesters with terminal alkynes to give substituted allenoates is described. Key to the development of a selective method was the recognition that an adventitous base catalyzes the isomerization to form the allenoate product. A plausible mechanism is proposed, based in part on evidence against a mechanism that involves a Cu(I)-acetylide as a low-valent intermediate.
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Affiliation(s)
- Matthew Hassink
- Brown Laboratories, Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
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11
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Abd-Alla HI, Shaaban M, Shaaban KA, Abu-Gabal NS, Shalaby NMM, Laatsch H. New bioactive compounds from Aloe hijazensis. Nat Prod Res 2009; 23:1035-49. [PMID: 19521919 DOI: 10.1080/14786410802242851] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
The chemical constituents and biological activities of leaves and roots of Aloe hijazensis, collected in Saudi Arabia, are reported here for the first time. Twenty-two compounds were obtained, among them eight hydroxyquinones: aloe-emodin (1), emodin (2), chrysophanol (3), aloesaponarin II 3-methyl ether (4), ziganein (5), ziganein-5-methyl ether (6a), aloesaponarin I (7) and chrysophanein (8), the dihydro-isocoumarin feralolide (9), 4,7-dichloro-quinoline (10), the triterpene lupeol (11), the anthrone aloin (12), three aloenin derivatives, aloenin (13) ethylidene-aloenin (14), and aloenin B (15), four flavonoids, quercetin (16), kaempferol (17) cosmosiin (18) and isovitexin (19), and cinnamic acid (20) and two further analogues, caffeic acid (21) and ferulic acid (22). While 15 of the isolated compounds were found in the leaves, 12 were isolated from roots of the plant. Compounds 6a and 10 are reported as new natural constituents, while the compounds 4, 5, 8, and 18 are reported here for the first time from Aloe spp. The structures of the compounds were deduced by intensive studies of their UV, NMR, MS data and by comparison with related structures. The biological activity of plant extracts was studied against various microbial strains, and potent anti-bacterial and anti-fungal activities were found. [image omitted] [image omitted].
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Affiliation(s)
- Howaida I Abd-Alla
- Department of Chemistry of Natural Compounds, Division of Pharmaceutical Industries, National Research Centre, Dokki-Cairo, Egypt
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12
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13
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Liu H, Leow D, Huang KW, Tan CH. Enantioselective Synthesis of Chiral Allenoates by Guanidine-Catalyzed Isomerization of 3-Alkynoates. J Am Chem Soc 2009; 131:7212-3. [DOI: 10.1021/ja901528b] [Citation(s) in RCA: 219] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Hongjun Liu
- Department of Chemistry, 3 Science Drive 3, National University of Singapore, Singapore 117543
| | - Dasheng Leow
- Department of Chemistry, 3 Science Drive 3, National University of Singapore, Singapore 117543
| | - Kuo-Wei Huang
- Department of Chemistry, 3 Science Drive 3, National University of Singapore, Singapore 117543
| | - Choon-Hong Tan
- Department of Chemistry, 3 Science Drive 3, National University of Singapore, Singapore 117543
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14
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El-Beih AA, Kawabata T, Koimaru K, Ohta T, Tsukamoto S. Monodictyquinone A: a New Antimicrobial Anthraquinone from a Sea Urchin-Derived Fungus Monodictys sp. Chem Pharm Bull (Tokyo) 2007; 55:1097-8. [PMID: 17603212 DOI: 10.1248/cpb.55.1097] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A new antimicrobial anthraquinone, 1,8-dihydroxy-2-methoxy-6-methylanthraquinone, monodictyquinone A (1), was isolated from a culture of a marine-derived fungus of the genus Monodictys which was isolated from the sea urchin, Anthocidaris crassispina, along with three known compounds, pachybasin (2), chrysophanol (3), and emodin (4).
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Affiliation(s)
- Ahmed Atef El-Beih
- Graduate School of Natural Science and Technology, Kanazawa University, Japan
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15
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Pettus TRR, Schlessinger RH. A HIGH YIELDING PROCEDURE FOR PREPARATION OF MONO-CARBOXYLATE SURROGATES OF ALLENIC DICARBOXYLATES AND DIESTERS. SYNTHETIC COMMUN 2006. [DOI: 10.1081/scc-120012992] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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16
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Kranjc K, Kočevar M. Diels–Alder reaction of highly substituted 2H-pyran-2-ones with alkynes: reactivity and regioselectivity. NEW J CHEM 2005. [DOI: 10.1039/b504852d] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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Tornare JM, Vogel P. The Synthesis of (±)-11-DeoxydaunomycinoneviaRegioselective TandemDiels-AlderReactions. Helv Chim Acta 2004. [DOI: 10.1002/hlca.19850680431] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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18
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Jayakanthan K, Madhusudanan K, Vankar YD. NaNO2–Ceric ammonium nitrate mediated conversion of acrylic esters and Baylis–Hillman derived acrylic esters into corresponding β-nitro acrylic esters. Tetrahedron 2004. [DOI: 10.1016/j.tet.2003.11.013] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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19
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Formation of (E) 1-alkoxy-1,3-butadienes from corresponding propargyl ethers; vicarious nucleophilic substitution in alkoxyallenes. Tetrahedron Lett 2003. [DOI: 10.1016/s0040-4039(03)01867-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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20
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Bringmann G, Menche D, Kraus J, Mühlbacher J, Peters K, Peters EM, Brun R, Bezabih M, Abegaz BM. Atropo-enantioselective total synthesis of knipholone and related antiplasmodial phenylanthraquinones. J Org Chem 2002; 67:5595-610. [PMID: 12153257 DOI: 10.1021/jo020189s] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The "lactone concept" has been efficiently employed for the first atropo-enantioselective synthesis of knipholone and related natural phenylanthraquinones. Besides the regio- and stereoselective construction of the biaryl axis, another important step was the "synthetically late" introduction of the C-acetyl group, either by a Friedel-Crafts type acetylation or by an ortho-selective Fries rearrangement first tested on simplified model systems and subsequently applied to the highly atroposelective preparation of the natural products and of simplified analogs thereof for biotesting. The synthetic availability of these natural biaryls, their precursors, and their unnatural analogs permitted a broader investigation of the antiplasmodial activities of these interesting biaryls.
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Affiliation(s)
- Gerhard Bringmann
- Institut für Organische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany.
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21
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Singh SB, Graham PL, Reamer RA, Cordingley MG. Discovery, total synthesis, HRV 3C-protease inhibitory activity, and structure-activity relationships of 2-methoxystypandrone and its analogues. Bioorg Med Chem Lett 2001; 11:3143-6. [PMID: 11720861 DOI: 10.1016/s0960-894x(01)00648-5] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
2-Methoxystypandrone, a naphthoquinone, was isolated from a Chinese herb Polygonum cuspidatum by bioassay guided fractionation using HRV 3C-protease assay. It showed an IC(50) value of 4.6 microM and is moderately selective. A new 10-step, total synthesis of 2-methoxystypandrone was accomplished in 45% overall yield using a Diels-Alder approach. Several analogues of this compound were prepared. Isolation, synthesis and HRV 3C-protease structure-activity relationships of these compounds have been described.
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Affiliation(s)
- S B Singh
- Merck Research Laboratories, PO Box 2000, Rahway, NJ 07065, USA.
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22
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Jung ME, Nishimura N. Stereoselective Formation of Formal Exo Diels−Alder Adducts of Silyloxydienes and Allenecarboxylates. J Am Chem Soc 1999. [DOI: 10.1021/ja9841660] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Michael E. Jung
- Department of Chemistry and Biochemistry University of California, Los Angeles, California 90095-1569
| | - Nobuko Nishimura
- Department of Chemistry and Biochemistry University of California, Los Angeles, California 90095-1569
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23
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Vlad PF, Krimer MZ. SUBSTITUTED GLUTACONIC ACIDS AND THEIR ESTERS IN ORGANIC SYNTHESIS. A REVIEW. ORG PREP PROCED INT 1998. [DOI: 10.1080/00304949809355326] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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24
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Kent JL, Wan H, Brummond KM. A new allenic Pauson-Khand cycloaddition for the preparation of α-methylene cyclopentenones. Tetrahedron Lett 1995. [DOI: 10.1016/0040-4039(95)00315-4] [Citation(s) in RCA: 65] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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25
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Jooste S, Erasmus E, Mienie LJ, de Wet WJ, Gibson KM. The detection of 3-methylglutarylcarnitine and a new dicarboxylic conjugate, 3-methylglutaconylcarnitine, in 3-methylglutaconic aciduria. Clin Chim Acta 1994; 230:1-8. [PMID: 7850987 DOI: 10.1016/0009-8981(94)90083-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Two patients, diagnosed with 3-methylglutaconic aciduria, who presented with diverse clinical and metabolic manifestations, were studied. Glycine conjugation as a possible detoxification mechanism in these two patients yielded negative results. Carnitine conjugates were however detected. 3-Methylglutarylcarnitine was observed in the urine of both patients, while one of the patients excreted detectable quantities of 3-methylglutaconylcarnitine, a previously unknown metabolite. The presence of this metabolite in urine samples from one patient and the apparent correlation between administered carnitine and the conjugate excretion profile seems to indicate that carnitine may play an important role in future therapeutic programmes.
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Affiliation(s)
- S Jooste
- Department of Biochemistry, Potchefstroom University for Christian Higher Education, South Africa
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26
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Kim HD, Park SA, Jew SS. A novel synthetic route to 11-deoxyanthracycline AB synthons. Arch Pharm Res 1994. [DOI: 10.1007/bf02980456] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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27
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De Schrijver J, De Clereq PJ. A novel synthesis of an a-ring precursor to 1α-hydroxyvitamin D. Tetrahedron Lett 1993. [DOI: 10.1016/s0040-4039(00)79355-5] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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28
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Nangia A, Rao BM, Prasuna G. Facile Synthesis of Anhydromevalonolactone from Ethyl Acetoacetate. SYNTHETIC COMMUN 1992. [DOI: 10.1080/00397919208019258] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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29
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Afarinkia K, Vinader V, Nelson TD, Posner GH. Diels-Alder cycloadditions of 2-pyrones and 2-pyridones. Tetrahedron 1992. [DOI: 10.1016/s0040-4020(01)85607-6] [Citation(s) in RCA: 281] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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30
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31
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Ahmed SA, Bardshiri E, Simpson TJ. Synthesis of substituted benzenoids and biphenyls via diels-aldercycloaddition of 6-methoxy-2-pyrones. Tetrahedron Lett 1988. [DOI: 10.1016/s0040-4039(00)80362-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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32
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Tsuda T, Sumiya R, Saegusa T. Nickel-Mediated Cycloaddition of Diynes with Carbon Dioxide to Bicyclic α-Pyrones. SYNTHETIC COMMUN 1987. [DOI: 10.1080/00397918708057214] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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33
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Naruta Y, Nishigaichi Y, Maruyama K. Trichloro-(trans-2,4-pentadienyl)stannane as a Less Electron-rich Diene and Its Application to Tandem Michael/Diels–Alder Reaction. Formal Total Synthesis of 11-Deoxydaunomycinone. CHEM LETT 1986. [DOI: 10.1246/cl.1986.1703] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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34
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35
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Convenient approaches to heterocycles via copper-catalysed additions of organic polyhalides to activated olefins. Tetrahedron 1985. [DOI: 10.1016/s0040-4020(01)97184-4] [Citation(s) in RCA: 73] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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