1
|
Das J, Ali W, Ghosh A, Pal T, Mandal A, Teja C, Dutta S, Pothikumar R, Ge H, Zhang X, Maiti D. Access to unsaturated bicyclic lactones by overriding conventional C(sp 3)-H site selectivity. Nat Chem 2023; 15:1626-1635. [PMID: 37563324 PMCID: PMC10624629 DOI: 10.1038/s41557-023-01295-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Accepted: 07/17/2023] [Indexed: 08/12/2023]
Abstract
Transition metal catalysis plays a pivotal role in transforming unreactive C-H bonds. However, regioselective activation of distal aliphatic C-H bonds poses a tremendous challenge, particularly in the absence of directing templates. Activation of a methylene C-H bond in the presence of methyl C-H is underexplored. Here we show activation of a methylene C-H bond in the presence of methyl C-H bonds to form unsaturated bicyclic lactones. The protocol allows the reversal of the general selectivity in aliphatic C-H bond activation. Computational studies suggest that reversible C-H activation is followed by β-hydride elimination to generate the Pd-coordinated cycloalkene that undergoes stereoselective C-O cyclization, and subsequent β-hydride elimination to provide bicyclic unsaturated lactones. The broad generality of this reaction has been highlighted via dehydrogenative lactonization of mid to macro ring containing acids along with the C-H olefination reaction with olefin and allyl alcohol. The method substantially simplifies the synthesis of important bicyclic lactones that are important features of natural products as well as pharmacoactive molecules.
Collapse
Affiliation(s)
- Jayabrata Das
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, India
| | - Wajid Ali
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, India
| | - Animesh Ghosh
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, India
| | - Tanay Pal
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, India
| | - Astam Mandal
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, India
| | - Chitrala Teja
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, India
| | - Suparna Dutta
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, India
| | | | - Haibo Ge
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX, USA.
| | - Xinglong Zhang
- Institute of High Performance Computing (IHPC), Agency for Science, Technology and Research (A*STAR), Singapore, Singapore.
| | - Debabrata Maiti
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, India.
| |
Collapse
|
2
|
Davison RT, Kuker EL, Dong VM. Teaching Aldehydes New Tricks Using Rhodium- and Cobalt-Hydride Catalysis. Acc Chem Res 2021; 54:1236-1250. [PMID: 33533586 DOI: 10.1021/acs.accounts.0c00771] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
By using transition metal catalysts, chemists have altered the "logic of chemical synthesis" by enabling the functionalization of carbon-hydrogen bonds, which have traditionally been considered inert. Within this framework, our laboratory has been fascinated by the potential for aldehyde C-H bond activation. Our approach focused on generating acyl-metal-hydrides by oxidative addition of the formyl C-H bond, which is an elementary step first validated by Tsuji in 1965. In this Account, we review our efforts to overcome limitations in hydroacylation. Initial studies resulted in new variants of hydroacylation and ultimately spurred the development of related transformations (e.g., carboacylation, cycloisomerization, and transfer hydroformylation).Sakai and co-workers demonstrated the first hydroacylation of olefins when they reported that 4-pentenals cyclized to cyclopentanones, using stoichiometric amounts of Wilkinson's catalyst. This discovery sparked significant interest in hydroacylation, especially for the enantioselective and catalytic construction of cyclopentanones. Our research focused on expanding the asymmetric variants to access medium-sized rings (e.g., seven- and eight-membered rings). In addition, we achieved selective intermolecular couplings by incorporating directing groups onto the olefin partner. Along the way, we identified Rh and Co catalysts that transform dienyl aldehydes into a variety of unique carbocycles, such as cyclopentanones, bicyclic ketones, cyclohexenyl aldehydes, and cyclobutanones. Building on the insights gained from olefin hydroacylation, we demonstrated the first highly enantioselective hydroacylation of carbonyls. For example, we demonstrated that ketoaldehydes can cyclize to form lactones with high regio- and enantioselectivity. Following these reports, we reported the first intermolecular example that occurs with high stereocontrol. Ketoamides undergo intermolecular carbonyl hydroacylation to furnish α-acyloxyamides that contain a depsipeptide linkage.Finally, we describe how the key acyl-metal-hydride species can be diverted to achieve a C-C bond-cleaving process. Transfer hydroformylation enables the preparation of olefins from aldehydes by a dehomologation mechanism. Release of ring strain in the olefin acceptor offers a driving force for the isodesmic transfer of CO and H2. Mechanistic studies suggest that the counterion serves as a proton-shuttle to enable transfer hydroformylation. Collectively, our studies showcase how transition metal catalysis can transform a common functional group, in this case aldehydes, into structurally distinct motifs. Fine-tuning the coordination sphere of an acyl-metal-hydride species can promote C-C and C-O bond-forming reactions, as well as C-C bond-cleaving processes.
Collapse
Affiliation(s)
- Ryan T. Davison
- Department of Chemistry, University of California, Irvine, Irvine, California 92697, United States
| | - Erin L. Kuker
- Department of Chemistry, University of California, Irvine, Irvine, California 92697, United States
| | - Vy M. Dong
- Department of Chemistry, University of California, Irvine, Irvine, California 92697, United States
| |
Collapse
|
3
|
Whyte A, Torelli A, Mirabi B, Zhang A, Lautens M. Copper-Catalyzed Borylative Difunctionalization of π-Systems. ACS Catal 2020. [DOI: 10.1021/acscatal.0c02758] [Citation(s) in RCA: 89] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Andrew Whyte
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada
| | - Alexa Torelli
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada
| | - Bijan Mirabi
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada
| | - Anji Zhang
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada
| | - Mark Lautens
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada
| |
Collapse
|
4
|
Makolo F, Viljoen A, Veale CGL. Mesembrine: The archetypal psycho-active Sceletium alkaloid. PHYTOCHEMISTRY 2019; 166:112061. [PMID: 31299396 DOI: 10.1016/j.phytochem.2019.112061] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2019] [Revised: 06/06/2019] [Accepted: 06/30/2019] [Indexed: 06/10/2023]
Abstract
(-)-Mesembrine is a chiral alkaloid that features an aryloctahydroindole skeleton and is most commonly found in species of the succulent genus Sceletium. Several Sceletium species are used by various ethnic groups in South Africa to manage disorders of the central nervous system. Binding assays have revealed that mesembrine is a more potent inhibitor of the serotonin transporter (SERT) than fluoxetine (Prozac) which has prompted the commercialization of mesembrine-containing consumer products. The congested all carbon quaternary stereocenter present at the bridgehead of mesembrine has rendered it a compound of interest for research in synthetic chemistry, which has assisted in the absolute configuration of the naturally occurring isomer to be assigned. Accordingly, this review will cover the recent literature pertaining to the distribution, structural elucidation, chemotaxonomy, biosynthesis, organic synthesis, as well as the biological activities of (-)-mesembrine. Recent synthetic procedures of the non-natural enantiomer as well as the racemate are also considered.
Collapse
Affiliation(s)
- Felix Makolo
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa
| | - Alvaro Viljoen
- Department of Pharmaceutical Sciences, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa; SAMRC Herbal Drugs Research Unit, Faculty of Science, Tshwane University of Technology, Private Bag X680, Pretoria, 0001, South Africa
| | - Clinton G L Veale
- School of Chemistry and Physics, Pietermaritzburg Campus, University of KwaZulu-Natal, Private Bag X01, Scottsville, 3209, South Africa.
| |
Collapse
|
5
|
Gondal HY, Cheema ZM, Zaidi JH, Yousuf S, Choudhary MI. Facile synthesis of α-alkoxymethyltriphenylphosphonium iodides: new application of PPh 3/I 2. Chem Cent J 2018; 12:62. [PMID: 29774487 PMCID: PMC5957017 DOI: 10.1186/s13065-018-0421-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Accepted: 04/28/2018] [Indexed: 11/16/2022] Open
Abstract
An efficient one pot method for the synthesis of α-alkoxymethylphosphonium iodides is developed by using PPh3/I2 combination at room temperature. Reaction conditions are found general to synthesize wide range of structurally variant alkoxymethylphosphonium iodides in high yield (70-91%). These new functionalized phosphonium salts are further used in stereoselective synthesis of vinyl ethers as well as in carbon homologation of aldehydes.
Collapse
Affiliation(s)
| | - Zain Maqsood Cheema
- Department of Chemistry, University of Sargodha, Sargodha, 40100, Pakistan
- Department of Chemistry, University of Sheffield, Sheffield, UK
| | - Javid Hussain Zaidi
- Department of Chemistry, Quaid-i-Azam University, Islamabad, 45320, Pakistan
| | - Sammer Yousuf
- H.E.J Research Institute of Chemistry, ICCBS, University of Karachi, Karachi, 75270, Pakistan
| | - M Iqbal Choudhary
- H.E.J Research Institute of Chemistry, ICCBS, University of Karachi, Karachi, 75270, Pakistan
| |
Collapse
|
6
|
Engesser T, Brückner R. Synthesis of trans
-Configured Enol Ethers by a Sequence of syn
-Selective Glycolate Aldol Addition, Hydrolysis, and Grob Fragmentation. European J Org Chem 2017. [DOI: 10.1002/ejoc.201701197] [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]
Affiliation(s)
- Tobias Engesser
- Institut für Organische Chemie; Albert-Ludwigs-Universität Freiburg; Albertstr. 21 79104 Freiburg im Breisgau Germany
| | - Reinhard Brückner
- Institut für Organische Chemie; Albert-Ludwigs-Universität Freiburg; Albertstr. 21 79104 Freiburg im Breisgau Germany
| |
Collapse
|
7
|
Smith KB, Brown MK. Regioselective Arylboration of Isoprene and Its Derivatives by Pd/Cu Cooperative Catalysis. J Am Chem Soc 2017; 139:7721-7724. [PMID: 28581713 PMCID: PMC5606143 DOI: 10.1021/jacs.7b04024] [Citation(s) in RCA: 117] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
A method for the regioselective arylboration of isoprene and its derivatives is presented. These reactions allow for the synthesis of useful building blocks from simple components. Through these studies, an unusual additive effect with DMAP has been uncovered that allows for altered reactivity and the formation of quaternary carbon centers. The utility of this method is demonstrated toward the formal synthesis of mesembrine.
Collapse
Affiliation(s)
- Kevin B. Smith
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, United States
| | - M. Kevin Brown
- Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, United States
| |
Collapse
|
8
|
Newton CG, Wang SG, Oliveira CC, Cramer N. Catalytic Enantioselective Transformations Involving C–H Bond Cleavage by Transition-Metal Complexes. Chem Rev 2017; 117:8908-8976. [DOI: 10.1021/acs.chemrev.6b00692] [Citation(s) in RCA: 643] [Impact Index Per Article: 91.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Christopher G. Newton
- Laboratory of Asymmetric
Catalysis and Synthesis, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Shou-Guo Wang
- Laboratory of Asymmetric
Catalysis and Synthesis, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Caio C. Oliveira
- Laboratory of Asymmetric
Catalysis and Synthesis, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| | - Nicolai Cramer
- Laboratory of Asymmetric
Catalysis and Synthesis, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
| |
Collapse
|
9
|
Krstenansky JL. Mesembrine alkaloids: Review of their occurrence, chemistry, and pharmacology. JOURNAL OF ETHNOPHARMACOLOGY 2017; 195:10-19. [PMID: 27939420 DOI: 10.1016/j.jep.2016.12.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2016] [Revised: 11/06/2016] [Accepted: 12/05/2016] [Indexed: 06/06/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Mesembrine alkaloids are considered to be the primary active constituents of the South African medicinal plant Sceletium tortuosum (L.) N.E.Br. (Aizoaceae), and it is used as the dried or fermented aerial material from the plant, which is known as kanna (aka, channa, kougoed). Traditional regional use ranged from relieving thirst, mild analgesia, and alteration of mood. Current interest has focused primarily on the antidepressant action of preparations based on the plant and commercialization is expanding the recognition and availability of these preparations. MATERIALS AND METHODS Searches for the keywords "Sceletium or mesembrine" were performed in "PubMed-NCBI", "Chemical Abstracts SciFinder" and "Thomson Reuters Web of Science" databases in addition to the inclusion of references cited within prior reviews and scientific reports. Additionally the "SciFinder" database was searched using 3a-phenyl-cis-octahydroindole in the SciFinder Substructure Module (SSM). Plant taxonomy was validated by the database "The Plant List". RESULTS This review focuses on the chemistry, analysis, and pharmacology of the mesembrine alkaloids. Despite a long history of medicinal used and research investigation, there has been a renewed interest in the pharmacological properties of the mesembrine alkaloids and much of the pharmacology has only recently been published. The two major active alkaloids mesembrine and mesembrenone are still in the process of being more fully characterized pharmacologically. They are serotonin reuptake inhibitors, which provides a rationale for the plant's traditional use as an antidepressant, but other actions are beginning to appear in the literature. Additionally, mesembrenone has reasonably potent PDE4 inhibitory activity. This review intends to provide an overview of the available literature, summarize the current findings, and put them in perspective with earlier studies and reviews.
Collapse
|
10
|
Wu X, Chen Z, Bai YB, Dong VM. Diastereodivergent Construction of Bicyclic γ-Lactones via Enantioselective Ketone Hydroacylation. J Am Chem Soc 2016; 138:12013-6. [DOI: 10.1021/jacs.6b06227] [Citation(s) in RCA: 66] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xuesong Wu
- Department
of Chemistry, University of California, Irvine, 4403 Natural
Sciences 1, Irvine, California 92697, United States
| | - Zhiwei Chen
- Department
of Chemistry, University of California, Irvine, 4403 Natural
Sciences 1, Irvine, California 92697, United States
| | - Yu-Bin Bai
- Department
of Chemistry, University of California, Irvine, 4403 Natural
Sciences 1, Irvine, California 92697, United States
- College of Science, Northwest A&F University, Yangling, Shaanxi 712100, P. R. China
| | - Vy M. Dong
- Department
of Chemistry, University of California, Irvine, 4403 Natural
Sciences 1, Irvine, California 92697, United States
| |
Collapse
|
11
|
Bhosale VA, Ukale DU, Waghmode SB. Total synthesis of Sceletium alkaloids (±)-joubertinamine, (±)-epijoubertinamine, (±)-tortuosamine and formal synthesis of (±)-mesembrine, (±)-N-formyltortuosamine. NEW J CHEM 2016. [DOI: 10.1039/c6nj00630b] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
An efficient collective formal/total synthesis of Sceletium alkaloids achieved by employing the Wittig olefination–Claisen rearrangement protocol.
Collapse
Affiliation(s)
- Viraj A. Bhosale
- Garware Research Center
- Department of Chemistry
- Savitribai Phule Pune University (formerly University of Pune)
- Pune 411007
- India
| | - Dattatraya U. Ukale
- Garware Research Center
- Department of Chemistry
- Savitribai Phule Pune University (formerly University of Pune)
- Pune 411007
- India
| | - Suresh B. Waghmode
- Garware Research Center
- Department of Chemistry
- Savitribai Phule Pune University (formerly University of Pune)
- Pune 411007
- India
| |
Collapse
|
12
|
Short and stereodivergent syntheses of (−)-5-epi-tashiromine and (−)-tashiromine and the formal synthesis of (−)-isoretronecanol and (−)-trachelanthamidine. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.tetasy.2015.05.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
13
|
Ozaki T, Kobayashi Y. Synthesis of (−)-mesembrine using the quaternary carbon-constructing allylic substitution. Org Chem Front 2015. [DOI: 10.1039/c4qo00353e] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
14
|
Kulkarni MG, Borhade AS, Shaikh YB, Dhondge AP, Birhade DR, Dhatrak NR. A stereodivergent approach to carbahexofuranoses: synthesis of carba-α-d-glucofuranose, carba-β-d-altrofuranose, carba-α-d-allofuranose, carba-β-d-idofuranose, carba-α-d-galactofuranose and carba-β-d-talofuranose. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2011.08.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
15
|
Kulkarni MG, Shaikh YB, Borhade AS, Dhondge AP, Chavhan SW, Desai MP, Birhade DR, Dhatrak NR, Gannimani R. The efficient synthesis of (3R,3aS,6aR)-hexahydrofuro[2,3-b]furan-3-ol and its isomers. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/j.tetasy.2010.08.005] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
16
|
Kulkarni MG, Dhondge AP, Chavhan SW, Borhade AS, Shaikh YB, Birhade DR, Desai MP, Dhatrak NR. Total synthesis of (±)-coerulescine and (±)-horsfiline. Beilstein J Org Chem 2010; 6:876-9. [PMID: 21085515 PMCID: PMC2982140 DOI: 10.3762/bjoc.6.103] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2010] [Accepted: 09/07/2010] [Indexed: 11/23/2022] Open
Abstract
Wittig olefination-Claisen rearrangement protocol was applied to obtain 3-allyl oxindole. This oxindole was then converted to (±)-coerulescine and (±)-horsfiline.
Collapse
Affiliation(s)
- Mukund G Kulkarni
- Department of Chemistry, University of Pune, Ganeshkhind, Pune-411 007, Maharashtra, India.
| | | | | | | | | | | | | | | |
Collapse
|
17
|
Kulkarni MG, Chavhan SW, Desai MP, Shaikh YB, Gaikwad DD, Dhondge AP, Borhade AS, Ningdale VB, Birhade DR, Dhatrak NR. A short and efficient synthesis of furo[2,3-b]indoles. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.06.068] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
18
|
Kulkarni MG, Dhondge AP, Borhade AS, Gaikwad DD, Chavhan SW, Shaikh YB, Nigdale VB, Desai MP, Birhade DR, Shinde MP. Total Synthesis of (±)-Physovenine. European J Org Chem 2009. [DOI: 10.1002/ejoc.200900391] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
19
|
Guérard KC, Sabot C, Racicot L, Canesi S. Oxidative Friedel−Crafts Reaction and its Application to the Total Syntheses of Amaryllidaceae Alkaloids. J Org Chem 2009; 74:2039-45. [DOI: 10.1021/jo802728u] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kimiaka C. Guérard
- Laboratoire de Méthodologie et Synthèse de Produits Naturels, Université du Québec à Montréal, C.P. 8888, Succursale Centre-Ville, Montréal, H3C 3P8, Québec, Canada
| | - Cyrille Sabot
- Laboratoire de Méthodologie et Synthèse de Produits Naturels, Université du Québec à Montréal, C.P. 8888, Succursale Centre-Ville, Montréal, H3C 3P8, Québec, Canada
| | - Léanne Racicot
- Laboratoire de Méthodologie et Synthèse de Produits Naturels, Université du Québec à Montréal, C.P. 8888, Succursale Centre-Ville, Montréal, H3C 3P8, Québec, Canada
| | - Sylvain Canesi
- Laboratoire de Méthodologie et Synthèse de Produits Naturels, Université du Québec à Montréal, C.P. 8888, Succursale Centre-Ville, Montréal, H3C 3P8, Québec, Canada
| |
Collapse
|
20
|
Zhao Y, Zhou Y, Liang L, Yang X, Du F, Li L, Zhang H. Palladium-Catalyzed Sequential Arylation and Allylic Alkylation of Highly Functionalized Ketones: A Concise Synthesis of Mesembrine. Org Lett 2008; 11:555-8. [PMID: 19117400 DOI: 10.1021/ol802608r] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Yuanhong Zhao
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, P. R. China
| | - Yongyun Zhou
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, P. R. China
| | - Leilei Liang
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, P. R. China
| | - Xiaodong Yang
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, P. R. China
| | - Fengxiang Du
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, P. R. China
| | - Liang Li
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, P. R. China
| | - Hongbin Zhang
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, School of Chemical Science and Technology, Yunnan University, Kunming, Yunnan 650091, P. R. China
| |
Collapse
|
21
|
Roe C, Stephenson GR. Electrophilic C12 building blocks for alkaloids: formal total synthesis of (+/-)-maritidine. Org Lett 2007; 10:189-92. [PMID: 18088133 DOI: 10.1021/ol702550z] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Silyl-protected benzyl alcohol derivatives and the salt 1 are used to form ortho-substituted C12 electrophilic organoiron building blocks which are converted into a spirocyclic cyclohexenone to complete a formal total synthesis of (+/-)-maritidine (5). The choice of TBDPS protection was shown to be better than TIPS and compatible with ipso nucleophile addition to form a quaternary center. The reaction sequence is the first example of a successful application in the synthesis of an arylcyclohexadienyliron complex with an ortho-carbon substituent in the position required for Amaryllidaceae alkaloids of this type.
Collapse
Affiliation(s)
- Caroline Roe
- Wolfson Materials and Catalysis Centre, School of Chemical Sciences and Pharmacy University of East Anglia, Norwich NR4 7TJ, UK
| | | |
Collapse
|
22
|
Chavan SP, Khobragade DA, Pathak AB, Kalkote U. A simple and efficient synthesis of (±)-mesembrine. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2004.05.021] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|