1
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Guo X, Li YY, Wang SH, Zhang FM, Li BS, Tu YQ, Zhang XM. Construction of the tetracyclic core of the Lycopodium alkaloid annotinolide C. Org Chem Front 2021. [DOI: 10.1039/d1qo00087j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
A concise approach to the tetracyclic core of annotinolide C has been developed which contains two key reactions epoxidation/1,2-migration to construct an aza [6.5] spiro ring (A and B) and semireduction/cyclization to construct lactone ring D.
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Affiliation(s)
- Xiang Guo
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
- China
| | - Yong-Yao Li
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
- China
| | - Shuang-Hu Wang
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
- China
| | - Fu-Min Zhang
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
- China
| | - Bao-Sheng Li
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 400044
- China
| | - Yong-Qiang Tu
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
- China
- School of Chemistry & Chemical Engineering
| | - Xiao-Ming Zhang
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
- China
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2
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Gohari SJ, Javidan A, Moghimi A, Taghizadeh MJ, Iman M. Novel enantioselective synthesis of (S)-ketamine using chiral auxiliary and precursor Mannich base. CAN J CHEM 2019. [DOI: 10.1139/cjc-2017-0731] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Ketamine has been extensively used as an anesthetic drug. Chiral auxiliaries such as tert-butanesulfinamide (TBSA) can be used for the asymmetric synthesis of (S)-ketamine. Condensation of TBSA with ketones provides tert-butanesulfinylimines in consistently high yields. The tert-butanesulfinyl group actuates the imine for nucleophilic addition, is a potent chiral directing group, and after nucleophilic addition is easily dissociated by intervention with acid solution. To prepare 2-(N-piperidinomethyl)-1-phenylcyclohexylamine (1), we started with the cyclohexanone and using Mannich reaction achieved an aminoketone. Then, we made the sulfiniylamin (2) by the condensation of TBSA with aminoketone. By using salts such as Ti(OEt)4, we obtained N-tert-butanesulfinylketimine in 85% yield. Next, we provided a new chiral center (3) using Grignard reagent as nucleophile at −78 °C (80% yield). Finally, after many steps, the (S)-ketamine synthesized under ozonolysis conditions, with good yield and enantioselectivity (75% yield and 75% ee).
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Affiliation(s)
- Seyed Jamaladdin Gohari
- Department of Chemistry, Faculty of Science, Imam Hossein Comprehensive University, Tehran, Iran
| | - Abdollah Javidan
- Department of Medicine Chemistry, Faculty of Science, Pharmaceutical Sciences Branch, Islamic Azad University, Tehran, Iran, and University of Eyvanekey, Eyvanekey, Iran
| | - Abolghasem Moghimi
- Department of Chemistry, Faculty of Science, Islamic Azad University, Tehran North Branch, Tehran, Iran
| | | | - Maryam Iman
- Chemical Injuries Research Center, Systems Biology and Poisonings Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran
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3
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A novel strategy for the asymmetric synthesis of (S)-ketamine using (S)-tert-butanesulfinamide and 1,2-cyclohexanedione. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2018. [DOI: 10.1007/s13738-018-1404-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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4
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Sultan S, Gupta V, Shah BA. Photoredox-Catalyzed Isatin Reactions: Access to Dibenzo-1,7-Naphthyridine Carboxylate and Tryptanthrin. CHEMPHOTOCHEM 2017. [DOI: 10.1002/cptc.201700028] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Shaista Sultan
- Natural Product Microbes and ACSIR; CSIR-Indian Institute of Integrative Medicine; Jammu 180001 India
| | - Vivek Gupta
- Department of Physics; University of Jammu; Jammu 180001 India
| | - Bhahwal Ali Shah
- Natural Product Microbes and ACSIR; CSIR-Indian Institute of Integrative Medicine; Jammu 180001 India
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5
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Zidan M, McCallum T, Thai-Savard L, Barriault L. Photoredox meets gold Lewis acid catalysis in the alkylative semipinacol rearrangement: a photocatalyst with a dark side. Org Chem Front 2017. [DOI: 10.1039/c7qo00590c] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The alkylative semipinacol rearrangement of a variety of TMS protected α-styrenyl substituted cyclic alcohols with unactivated bromoalkanes that merge photoredox and Au(i)/Au(iii) catalysis has been achieved.
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Affiliation(s)
- M. Zidan
- Centre for Catalysis
- Research and Innovation
- Department of Chemistry and Biomolecular Sciences
- University of Ottawa
- Ottawa
| | - T. McCallum
- Centre for Catalysis
- Research and Innovation
- Department of Chemistry and Biomolecular Sciences
- University of Ottawa
- Ottawa
| | - L. Thai-Savard
- Centre for Catalysis
- Research and Innovation
- Department of Chemistry and Biomolecular Sciences
- University of Ottawa
- Ottawa
| | - L. Barriault
- Centre for Catalysis
- Research and Innovation
- Department of Chemistry and Biomolecular Sciences
- University of Ottawa
- Ottawa
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6
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Annadi K, Wee AGH. An Alkylidene Carbene C–H Activation Approach toward the Enantioselective Syntheses of Spirolactams: Application to the Synthesis of (−)-Adalinine. J Org Chem 2016; 81:1021-38. [DOI: 10.1021/acs.joc.5b02582] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Krishna Annadi
- Department
of Chemistry and
Biochemistry, University of Regina, Regina, Saskatchewan, S4S 0A2, Canada
| | - Andrew G. H. Wee
- Department
of Chemistry and
Biochemistry, University of Regina, Regina, Saskatchewan, S4S 0A2, Canada
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7
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Zhang QW, Zhang XB, Li BS, Xiang K, Zhang FM, Wang SH, Tu YQ. Catalytic intermolecular carbon electrophile induced semipinacol rearrangement. Chem Commun (Camb) 2013; 49:1648-50. [DOI: 10.1039/c2cc38585f] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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8
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9
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Zhang QW, Xiang K, Tu YQ, Zhang SY, Zhang XM, Zhao YM, Zhang TC. Formal synthesis of (-)-cephalotaxine based on a tandem hydroamination/semipinacol rearrangement reaction. Chem Asian J 2012; 7:894-8. [PMID: 22383373 DOI: 10.1002/asia.201101029] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2011] [Indexed: 11/12/2022]
Affiliation(s)
- Qing-Wei Zhang
- State Key Laboratory of Applied Organic Chemistry and Department of Chemistry, Lanzhou University, Lanzhou 730000, P. R. China
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10
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Palmer LI, Read de Alaniz J. Direct and Highly Diastereoselective Synthesis of Azaspirocycles by a Dysprosium(III) Triflate Catalyzed Aza-Piancatelli Rearrangement. Angew Chem Int Ed Engl 2011; 50:7167-70. [DOI: 10.1002/anie.201102102] [Citation(s) in RCA: 116] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2011] [Revised: 05/20/2011] [Indexed: 11/08/2022]
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11
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Palmer LI, Read de Alaniz J. Direct and Highly Diastereoselective Synthesis of Azaspirocycles by a Dysprosium(III) Triflate Catalyzed Aza-Piancatelli Rearrangement. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201102102] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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12
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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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13
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Liang T, Zhang Z, Antilla JC. Chiral Brønsted Acid Catalyzed Pinacol Rearrangement. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.201004778] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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14
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Liang T, Zhang Z, Antilla JC. Chiral Brønsted Acid Catalyzed Pinacol Rearrangement. Angew Chem Int Ed Engl 2010; 49:9734-6. [DOI: 10.1002/anie.201004778] [Citation(s) in RCA: 106] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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15
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Kim I, Kim K. Expeditious Synthesis of Highly Substituted Indolizinones via a Palladium-Catalyzed Domino Sequence. Org Lett 2010; 12:2500-3. [DOI: 10.1021/ol1006778] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ikyon Kim
- Medicinal Chemistry Research Center, Korea Research Institute of Chemical Technology, Daejeon 305-600, Republic of Korea
| | - Kyungsun Kim
- Medicinal Chemistry Research Center, Korea Research Institute of Chemical Technology, Daejeon 305-600, Republic of Korea
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16
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Kozak JA, Dodd JM, Harrison TJ, Jardine KJ, Patrick BO, Dake GR. Enamides and enesulfonamides as nucleophiles: formation of complex ring systems through a platinum(II)-catalyzed addition/Friedel-Crafts pathway. J Org Chem 2010; 74:6929-35. [PMID: 19689099 DOI: 10.1021/jo901512m] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Cyclic enamine derivatives (enesulfonamides and enamides) tethered to an 1-arylalkynyl fragment undergo a platinum(II)-catalyzed tandem alkyne addition/Friedel-Crafts ring closure to form nitrogen-containing polycyclic structures. Regioselectivity in the initial addition of the enesulfonamide or enamide nucleophile to the platinum(II)-alkyne complex is important. Electron-rich arenes and heterocycles led to the formation of products resulting from an initial 6-endo cyclization. Twenty-three examples of this process are presented.
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Affiliation(s)
- Jennifer A Kozak
- Department of Chemistry, 2036 Main Mall, University of British Columbia, Vancouver, BC, Canada V6T 1Z1
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17
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Yokoyama T, Yokoyama R, Nomura S, Matsumoto S, Fujiyama R, Kiyooka SI. Synthesis of (S)-Ketamine via [1,3]-Chirality Transfer of a Stereocenter Created by Enantioselective Aldol Reaction. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2009. [DOI: 10.1246/bcsj.82.1528] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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18
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Yokoyama R, Matsumoto S, Nomura S, Higaki T, Yokoyama T, Kiyooka SI. Enantioselective construction of nitrogen-substituted quaternary carbon centers adjacent to the carbonyl group in the cyclohexane ring: first asymmetric synthesis of anesthetic (S)-ketamine with high selectivity. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.05.004] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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19
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Bunnelle EM, Smith CR, Lee SK, Singaram SW, Rhodes AJ, Sarpong R. Pt-catalyzed cyclization/migration of propargylic alcohols for the synthesis of 3(2H)-furanones, pyrrolones, indolizines, and indolizinones. Tetrahedron 2008; 64:7008-7014. [PMID: 22593605 PMCID: PMC3351138 DOI: 10.1016/j.tet.2008.02.103] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Several heterocycles such as furanones, pyrrolones, and indolizines, which are of pharmacological importance, are easily accessed via the Pt(II)-catalyzed heterocyclization/1,2-migration of propargylic ketols or hydroxy imine derivatives. This method sidesteps the challenges of traditional heteroaromatic oxygenation strategies such as regioselectivity and functional group tolerance in the syntheses of these heterocycles.
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Affiliation(s)
- Eric M. Bunnelle
- Department of Chemistry, University of California, Berkeley, CA 94720, USA
| | - Cameron R. Smith
- Department of Chemistry, University of California, Berkeley, CA 94720, USA
| | - Sharon K. Lee
- Department of Chemistry, University of California, Berkeley, CA 94720, USA
| | | | - Allison J. Rhodes
- Department of Chemistry, University of California, Berkeley, CA 94720, USA
| | - Richmond Sarpong
- Department of Chemistry, University of California, Berkeley, CA 94720, USA
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20
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Hurley PB, Dake GR. Synthetic Studies toward Halichlorine: Complex Azaspirocycle Formation with Use of an NBS-Promoted Semipinacol Reaction. J Org Chem 2008; 73:4131-8. [DOI: 10.1021/jo800336k] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Paul B. Hurley
- Department of Chemistry, 2036 Main Mall, University of British Columbia, Vancouver, B.C., Canada V6T 1Z1
| | - Gregory R. Dake
- Department of Chemistry, 2036 Main Mall, University of British Columbia, Vancouver, B.C., Canada V6T 1Z1
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21
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22
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Smith CR, Bunnelle EM, Rhodes AJ, Sarpong R. Pt-catalyzed cyclization/1,2-migration for the synthesis of indolizines, pyrrolones, and indolizinones. Org Lett 2007; 9:1169-71. [PMID: 17309277 PMCID: PMC3384527 DOI: 10.1021/ol0701971] [Citation(s) in RCA: 142] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Indolizine, pyrrolone, and indolizinone heterocycles are easily accessed via the Pt(II)-catalyzed cycloisomerization or a tandem cyclization/1,2-migration of pyridine propargylic alcohols and derivatives. This method provides an efficient synthesis of highly functionalized heterocycles from readily available substrates. [reaction: see text]
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Affiliation(s)
- Cameron R. Smith
- Department of Chemistry, University of California, Berkeley, California 94720
| | - Eric M. Bunnelle
- Department of Chemistry, University of California, Berkeley, California 94720
| | - Allison J. Rhodes
- Department of Chemistry, University of California, Berkeley, California 94720
| | - Richmond Sarpong
- Department of Chemistry, University of California, Berkeley, California 94720
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23
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Abstract
An asymmetric formal synthesis of fasicularin (1) is described. This natural product, isolated from the extracts of the marine invertebrate Nephteis fasicularis, has shown modest cytotoxicity towards Vero cells. Fasicularin is among only two members of the cylindricine family of natural products, along with lepadiformine (2), to possess a trans A-B ring junction. Key steps of this approach to 1 involve a siloxy-epoxide semipinacol rearrangement of 5 to 6, a B-alkyl Suzuki-Miyaura coupling reaction by using enol trifluoromethanesulfonate 19 and a substrate-directed hydrogenation reaction of 24. This formal synthesis also highlights the difficulty in the incorporation of the thiocyanate functionality present in 1.
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24
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Dake G. Recent approaches to the construction of 1-azaspiro[4.5]decanes and related 1-azaspirocycles. Tetrahedron 2006. [DOI: 10.1016/j.tet.2006.01.071] [Citation(s) in RCA: 93] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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25
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Hassfeld J, Kalesse M, Stellfeld T, Christmann M. Asymmetric total synthesis of complex marine natural products. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 2005; 97:133-203. [PMID: 16261808 DOI: 10.1007/b135825] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Among nature's ecosystems, the marine environment has been an extremely rich source of structurally complex and biologically active molecules. This review aims to cover the recent developments in the synthesis of marine natural products, also reflecting the trend of their increased use to address biological questions. The examples chosen should be viewed as representative of the different structural motifs on the one hand and the strategies and stimuli for their synthesis on the other.
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Affiliation(s)
- Jorma Hassfeld
- Institut für Organische Chemie, Universität Hannover, Schneiderberg 1B, 30167 Hannover, Germany
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26
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de Sousa AL, Pilli RA. A Concise Route to the Azaspirodecane Moiety of Halichlorine and Structurally Related Alkaloids. Org Lett 2005; 7:1617-9. [PMID: 15816766 DOI: 10.1021/ol050306g] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text] A tandem Michael addition-enolate alkylation followed by Dieckmann cyclization and Beckmann rearrangement provided the corresponding [5.4.0] azaspirobicyclodecane, a key intermediate in our synthetic route to the marine alkaloid halichlorine (1).
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Affiliation(s)
- Andrea L de Sousa
- Instituto de Química, Universidade Estadual de Campinas, C. P. 6154,13084-971, Campinas, SP, Brazil
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27
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Feldman KS, Perkins AL, Masters KM. Alkynyliodonium salts in organic synthesis. Application to the preparation of the tricyclic core of (+/-)-halichlorine. J Org Chem 2004; 69:7928-32. [PMID: 15527272 DOI: 10.1021/jo0487911] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The tricyclic core of halichlorine has been synthesized through the use of an alkynyliodonium salt/alkylidenecarbene/1,5 C-H insertion sequence that sets the pivotal quaternary center in the target.
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Affiliation(s)
- Ken S Feldman
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
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28
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Arini LG, Szeto P, Hughes DL, Stockman RA. Combining two-directional synthesis and tandem reactions. Part 4: A concise approach to the spirocyclic core of halichlorine and the pinnaic acids. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2004.09.058] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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29
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Dake GR, Fenster MDB, Fleury M, Patrick BO. Investigations of alpha-siloxy-epoxide ring expansions forming 1-azaspirocyclic ketones. J Org Chem 2004; 69:5676-83. [PMID: 15307739 DOI: 10.1021/jo049356+] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The construction of 1-azaspirocyclic cycloalkanones using a siloxy-epoxide semipinacol ring expansion process was examined. Functionalized 1-azaspiro[5.5]undecan-7-ones (1-azaspirocyclic cyclohexanones) proceeded in high chemical yields with complete diastereoselectivity using titanium tetrachloride as the Lewis acid promoter. The formation of functionalized 6-azaspiro[5.4]-decan-1-ones (1-azaspirocyclic cyclopentanones) proceeded in high chemical yield with little diastereoselectivity. Modification of reaction parameters such as the Lewis acid promoter or the nature of the silyl ether allowed for the preferential formation of either ("anti" or "syn" 1,2 alkyl shift) diastereomeric product. An explanation for the different reactivity profiles between the cyclobutanol silyl ethers and cyclopentanol silyl ethers is provided.
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Affiliation(s)
- Gregory R Dake
- Department of Chemistry, 2036 Main Mall, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1
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30
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Dake GR, Fenster MDB, Hurley PB, Patrick BO. Synthesis of Functionalized 1-Azaspirocyclic Cyclopentanones Using Bronsted Acid or N-Bromosuccinimide Promoted Ring Expansions. J Org Chem 2004; 69:5668-75. [PMID: 15307738 DOI: 10.1021/jo0493572] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Azaspirocyclic ring systems are present in a variety of alkaloids. Functionalized 1-azaspirocyclopentanones (6, 7, 11, 12) can be efficiently constructed through semipinacol ring expansion reactions of 2-(1-hydroxycyclobutyl)-p-toluenesulfonylenamides (4) promoted by either a Bronsted acid ((S)-(+)-10-camphorsulfonic acid or HCl) or N-bromosuccinimide, an electrophilic bromine source. Reactions promoted by N-bromosuccinimide tend to proceed in higher yields (80-95%) and with greater diastereoselectivity (3:1-1:0) compared to those reactions promoted by a Bronsted acid. In addition, N-bromosuccinimide promoted reactions can produce a complementary stereochemical outcome compared to the reactions using Bronsted acid.
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Affiliation(s)
- Gregory R Dake
- Department of Chemistry, 2036 Main Mall, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1.
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31
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Ferrali A, Guarna A, Lo Galbo F, Occhiato EG. A lactam-derived vinyl boronate as a stable and crystalline reagent for the synthesis of 2-substituted piperidines by Pd-catalyzed coupling reactions. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2004.05.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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32
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Maryanoff BE, Zhang HC, Cohen JH, Turchi IJ, Maryanoff CA. Cyclizations of N-acyliminium ions. Chem Rev 2004; 104:1431-628. [PMID: 15008627 DOI: 10.1021/cr0306182] [Citation(s) in RCA: 551] [Impact Index Per Article: 27.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Bruce E Maryanoff
- Johnson & Johnson Pharmaceutical Research & Development, Spring House, Pennsylvania 19477-0776, USA.
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33
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Yu M, Clive DL, Yeh VS, Kang S, Wang J. Synthesis of the substituted spiro segment of halichlorine––use of radical cyclization and stereospecific cuprate addition to an α,β-unsaturated lactam. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2004.02.078] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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34
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Chinchilla R, Nájera C, Yus M. Metalated Heterocycles and Their Applications in Synthetic Organic Chemistry. Chem Rev 2004; 104:2667-722. [PMID: 15137804 DOI: 10.1021/cr020101a] [Citation(s) in RCA: 272] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Rafael Chinchilla
- Departamento de Química Orgánica and Instituto de Síntesis Orgánica, Facultad de Ciencias, Universidad de Alicante, Apartado 99, 03080 Alicante, Spain.
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Easton LP, Dake GR. Nucleophilic additions of lactam-derived enol triflates to aldehydes mediated by nickel(II) and chromium(II) salts. CAN J CHEM 2004. [DOI: 10.1139/v03-164] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Enol trifluoromethanesulfonates (triflates) derived from N-protected lactams undergo nickel(II)-chloride- and chromium(II)-chloride-promoted carbonyl additions to aldehydes. The yields of this process range from 42%84%.Key words: nickel(II) chloride, chromium(II) chloride, carbonyl addition, lactam-derived enol triflate.
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Abstract
[reaction: see text] Our synthetic approach toward fasicularin is presented. Key steps in this construction are a siloxy-epoxide semipinacol rearrangement, a B-alkyl Suzuki reaction and an intramolecular S(N)2 reaction.
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Affiliation(s)
- Michaël D B Fenster
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC V6T 1Z1, Canada
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Khan FA, Dash J. A novel and expeditious approach to unusual spirolactam building blocks. J Org Chem 2003; 68:4556-9. [PMID: 12762770 DOI: 10.1021/jo034023i] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A rapid access to 7-azaspiro[4.5]decan-6-ones 1 involving three regio- and chemoselective reactions starting from tetrabromonorbornyl derivatives is described. The alkaline H(2)O(2) cleavage reaction of monosubstituted alpha-diketones 9 furnished the potential bridged bicyclic lactones 10in a highly regio- and stereoselective manner. The radical-mediated, intermolecular bridgehead C-C bond formation of the versatile bridged lactones 10 with acrylonitrile followed by LAH reduction of the adduct 13 intriguingly leads to the formation of novel spirolactam building blocks 1.
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Affiliation(s)
- Faiz Ahmed Khan
- Department of Chemistry, Indian Institute of Technology, Kanpur-208 016, India.
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Weintraub PM, Sabol JS, Kane JM, Borcherding DR. Recent advances in the synthesis of piperidones and piperidines. Tetrahedron 2003. [DOI: 10.1016/s0040-4020(03)00295-3] [Citation(s) in RCA: 320] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Wardrop DJ, Burge MS, Zhang W, Ortı́z JA. π-Face selective azaspirocyclization of ω-(methoxyphenyl)-N-methoxyalkylamides. Tetrahedron Lett 2003. [DOI: 10.1016/s0040-4039(03)00227-2] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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