1
|
Luo M, Li L, Chen S, Yan Q, Lv J, Zeng J, Wang H, Gu S, Chen F. Synthesis of 2,4-Disubstituted Oxazoles and Thiazoles via Brønsted Acid-Catalyzed Cyclization of α-diazoketones with Amides. J Org Chem 2024; 89:5038-5048. [PMID: 38517950 DOI: 10.1021/acs.joc.4c00269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/24/2024]
Abstract
A novel method is described for the synthesis of 2,4-disubstituted oxazole and thiazole derivates via the coupling of α-diazoketones with (thio)amides or thioureas using trifluoromethanesulfonic acid (TfOH) as a catalyst. This protocol is characterized by mild reaction conditions, metal-free, and simplicity and also features good functional group tolerance, good to excellent yields, and a broad substrate scope with more than 40 examples. Experimental studies suggest a mechanism involving 2-oxo-2-phenylethyl trifluoromethanesulfonate as the key intermediate.
Collapse
Affiliation(s)
- Mengxiang Luo
- School of Chemical Engineering & Pharmacy and Pharmaceutical Research Institute, Wuhan Institute of Technology, Wuhan 430205, China
| | - Lewan Li
- School of Chemical Engineering & Pharmacy and Pharmaceutical Research Institute, Wuhan Institute of Technology, Wuhan 430205, China
| | - Shixin Chen
- School of Chemical Engineering & Pharmacy and Pharmaceutical Research Institute, Wuhan Institute of Technology, Wuhan 430205, China
| | - Qiongjiao Yan
- School of Chemical Engineering & Pharmacy and Pharmaceutical Research Institute, Wuhan Institute of Technology, Wuhan 430205, China
| | - Jian Lv
- School of Chemical Engineering & Pharmacy and Pharmaceutical Research Institute, Wuhan Institute of Technology, Wuhan 430205, China
| | - Jie Zeng
- School of Chemical Engineering & Pharmacy and Pharmaceutical Research Institute, Wuhan Institute of Technology, Wuhan 430205, China
| | - Haifeng Wang
- School of Chemical Engineering & Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
- Jiangxi Province Key Laboratory of Synthetic Chemistry, East China University of Technology, Nanchang 330013, China
- Pharmaceutical Research Institute, Wuhan Institute of Technology, Wuhan 430205, China
- Key Laboratory of Green Chemical Engineering Process of Ministry of Education, Wuhan 430205, China
| | - Shuangxi Gu
- School of Chemical Engineering & Pharmacy, Wuhan Institute of Technology, Wuhan 430205, China
| | - Fener Chen
- Pharmaceutical Research Institute, Wuhan Institute of Technology, Wuhan 430205, China
- Engineering Center of Catalysis and Synthesis for Chiral Molecules, Department of Chemistry, Fudan University, Shanghai 200433, China
- Shanghai Engineering Center of Industrial Catalysis for Chiral Drugs, Shanghai 200433, China
| |
Collapse
|
2
|
Munir R, Zahoor AF, Nazeer U, Saeed MA, Mansha A, Irfan A, Tariq MU. Gilman reagent toward the synthesis of natural products. RSC Adv 2023; 13:35172-35208. [PMID: 38053693 PMCID: PMC10694855 DOI: 10.1039/d3ra07359a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2023] [Accepted: 11/19/2023] [Indexed: 12/07/2023] Open
Abstract
With the ever-increasing scope of organocuprates, a well-established Gilman reagent has been considered as an unprecedented synthetic tool in modern organic chemistry. The broad research profile of the Gilman reagent (R2CuLi in THF or Et2O) is owing to its propensity to carry out three kinds of reactions, i.e., epoxide ring opening reactions, 1,4-conjugate addition reactions, and SN2 reactions in a regioselective manner. This review examines the applications of Gilman reagent in the total synthesis of both abundant and scarce natural products of remarkable synthetic pharmaceutical profile reported since 2011. The presented insights will be of a vital roadmap to general organic synthesis and it will contribute to the development of new natural products and their analogues in future drug discovery.
Collapse
Affiliation(s)
- Ramsha Munir
- Department of Chemistry, Government College University Faisalabad 38000-Faisalabad Pakistan
| | - Ameer Fawad Zahoor
- Department of Chemistry, Government College University Faisalabad 38000-Faisalabad Pakistan
| | - Usman Nazeer
- Department of Chemistry, University of Houston 3585 Cullen Boulevard Texas 77204-5003 USA
| | - Muhammad Athar Saeed
- Department of Chemistry, Government College University Faisalabad 38000-Faisalabad Pakistan
| | - Asim Mansha
- Department of Chemistry, Government College University Faisalabad 38000-Faisalabad Pakistan
| | - Ahmad Irfan
- Department of Chemistry, King Khalid University P.O. Box 9004 Abha 61413 Saudi Arabia
| | - Muhammad Umair Tariq
- Department of Chemistry, Faculty of Natural Sciences, Forman Christian College University Lahore 54600 Pakistan
| |
Collapse
|
3
|
Kumar Manda SL, Tripathi S, Ghoshal A, Ambule MD, Srivastava AK, Panda G. A Comparative Synthetic Strategy Perspective on α-Amino Acid- and Non-Amino Acid-Derived Synthons towards Total Syntheses of Selected Natural Macrolides. Chemistry 2020; 26:5131-5156. [PMID: 31846112 DOI: 10.1002/chem.201904564] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2019] [Revised: 11/19/2019] [Indexed: 12/29/2022]
Abstract
Macrocyclic alkaloids (macrolides) and cyclopeptides have an immense range of applications in drug discovery research because of their natural abundance and potential biological and physicochemical properties. Presently, more than 100 approved drugs or clinical drug candidates contain macrocyclic scaffolds as the biologically active component. This review provides an interesting perspective about the use of amino acid-derived chiral pools versus other methods derived from miscellaneous synthons towards the total synthesis of non-peptidic macrolides. The synthetic routes and the key strategies involved in the total syntheses of ten natural macrolides have been discussed. Both the amino acid-derived and non-amino acid-derived synthetic routes have been illustrated to present a comparative study between the two approaches.
Collapse
Affiliation(s)
- Srinivas Lavanya Kumar Manda
- Division of Medicinal and Process Chemistry, CSIR-Central Drug Research Institute, Sector-10, Jankipuram Extension, Lucknow, 226031, India.,Chemical Sciences Division, Academy of Scientific and Innovative Research (AcSIR), New Delhi, 110025, India
| | - Shashank Tripathi
- Division of Medicinal and Process Chemistry, CSIR-Central Drug Research Institute, Sector-10, Jankipuram Extension, Lucknow, 226031, India.,Chemical Sciences Division, Academy of Scientific and Innovative Research (AcSIR), New Delhi, 110025, India
| | - Anirban Ghoshal
- Division of Medicinal and Process Chemistry, CSIR-Central Drug Research Institute, Sector-10, Jankipuram Extension, Lucknow, 226031, India.,Chemical Sciences Division, Academy of Scientific and Innovative Research (AcSIR), New Delhi, 110025, India
| | - Mayur D Ambule
- Division of Medicinal and Process Chemistry, CSIR-Central Drug Research Institute, Sector-10, Jankipuram Extension, Lucknow, 226031, India.,Chemical Sciences Division, Academy of Scientific and Innovative Research (AcSIR), New Delhi, 110025, India
| | - Ajay Kumar Srivastava
- Division of Medicinal and Process Chemistry, CSIR-Central Drug Research Institute, Sector-10, Jankipuram Extension, Lucknow, 226031, India.,Chemical Sciences Division, Academy of Scientific and Innovative Research (AcSIR), New Delhi, 110025, India
| | - Gautam Panda
- Division of Medicinal and Process Chemistry, CSIR-Central Drug Research Institute, Sector-10, Jankipuram Extension, Lucknow, 226031, India.,Chemical Sciences Division, Academy of Scientific and Innovative Research (AcSIR), New Delhi, 110025, India
| |
Collapse
|
4
|
Suh YG, Lim C, Sim J, Lee JK, Surh YJ, Paek SM. Construction of the Azacyclic Core of Tabernaemontanine-Related Alkaloids via Tandem Reformatsky-Aza-Claisen Rearrangement. J Org Chem 2017; 82:1464-1470. [PMID: 28051867 DOI: 10.1021/acs.joc.6b02648] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
A divergent synthetic methodology for a tabernaemontanine-related alkaloid was developed. The synthetic route features practical improvements in the Pictet-Spengler cyclization for the tetrahydro-β-carboline intermediate and an unprecedented tandem Reformatsky-aza-Claisen rearrangement to create the core carbon skeleton and stereochemistries of tabernaemontanine-related alkaloids.
Collapse
Affiliation(s)
- Young-Ger Suh
- College of Pharmacy, Seoul National University , 1 Gwanak-ro, Gwanak-gu, Seoul 151-742, Republic of Korea
| | - Changjin Lim
- College of Pharmacy, Seoul National University , 1 Gwanak-ro, Gwanak-gu, Seoul 151-742, Republic of Korea
| | - Jaehoon Sim
- College of Pharmacy, Seoul National University , 1 Gwanak-ro, Gwanak-gu, Seoul 151-742, Republic of Korea
| | - Jae Kyun Lee
- Neuro-Medicine Center, Korea Institute of Science and Technology , P.O. Box 131, Seoul 130-650, Republic of Korea
| | - Young-Joon Surh
- Tumor Microenvironment Global Core Research Center, College of Pharmacy, Seoul National University , 1 Gwanak-ro, Gwanak-gu, Seoul 151-742, Republic of Korea
| | - Seung-Mann Paek
- College of Pharmacy, Research Institute of Pharmaceutical Science, Gyeongsang National University , Jinju daero, Jinju 660-751, Republic of Korea
| |
Collapse
|
5
|
Thiede S, Wosniok PR, Herkommer D, Debnar T, Tian M, Wang T, Schrempp M, Menche D. Total Synthesis of Leupyrrins A1and B1, Highly Potent Antifungal Agents from the MyxobacteriumSorangium cellulosum. Chemistry 2016; 23:3300-3320. [DOI: 10.1002/chem.201604445] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2016] [Indexed: 01/17/2023]
Affiliation(s)
- Sebastian Thiede
- Kekulé-Institut für Organische Chemie und Biochemie; Universität Bonn; Gerhard-Domagk-Str. 1 53121 Bonn Germany
| | - Paul R. Wosniok
- Kekulé-Institut für Organische Chemie und Biochemie; Universität Bonn; Gerhard-Domagk-Str. 1 53121 Bonn Germany
| | - Daniel Herkommer
- Kekulé-Institut für Organische Chemie und Biochemie; Universität Bonn; Gerhard-Domagk-Str. 1 53121 Bonn Germany
- Current address: GlaxoSmithKline, Medicines Research Centre; Gunnels Wood Road Stevenage SG1 2NY UK
| | - Thomas Debnar
- Kekulé-Institut für Organische Chemie und Biochemie; Universität Bonn; Gerhard-Domagk-Str. 1 53121 Bonn Germany
- Current address: Dottikon Exclusive Synthesis AG; Dottikon Switzerland
| | - Maoqun Tian
- Kekulé-Institut für Organische Chemie und Biochemie; Universität Bonn; Gerhard-Domagk-Str. 1 53121 Bonn Germany
- Current address: Scripps Research Institute; La Jolla USA
| | - Tongtong Wang
- Kekulé-Institut für Organische Chemie und Biochemie; Universität Bonn; Gerhard-Domagk-Str. 1 53121 Bonn Germany
- Current address: Institute of Quality Standard and Testing Technology for Agro-products; Chinese Academy of Agricultural Sciences; Key Laboratory of Agro-food Safety and Quality; Ministry of Agriculture; Beijing China
| | - Michael Schrempp
- Kekulé-Institut für Organische Chemie und Biochemie; Universität Bonn; Gerhard-Domagk-Str. 1 53121 Bonn Germany
| | - Dirk Menche
- Kekulé-Institut für Organische Chemie und Biochemie; Universität Bonn; Gerhard-Domagk-Str. 1 53121 Bonn Germany
| |
Collapse
|
6
|
Shinomiya S, Iwasaki A, Ohno O, Suenaga K. Total synthesis and stereochemical determination of yoshinone A. PHYTOCHEMISTRY 2016; 132:109-114. [PMID: 27765324 DOI: 10.1016/j.phytochem.2016.10.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2016] [Revised: 10/03/2016] [Accepted: 10/11/2016] [Indexed: 06/06/2023]
Abstract
In 2014, the γ-pyrone-containing polyketide, yoshinone A, was isolated from the marine cyanobacterium Leptolyngbya sp. and its structure was determined. Yoshinone A inhibited differentiation of 3T3-L1 cells into adipocytes, with an EC50 value of 420 nM without any cytotoxicity, and therefore is expected to be a lead compound for obesity drugs. To establish its absolute configuration, and to provide sufficient amounts for further research, the total synthesis of yoshinone A was achieved through synthesis of its two possible diastereomers.
Collapse
Affiliation(s)
- Seiichi Shinomiya
- Department of Chemistry, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
| | - Arihiro Iwasaki
- Department of Chemistry, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
| | - Osamu Ohno
- Department of Chemistry and Life Science, Kogakuin University, 2665-1, Nakano-Machi, Hachioji, Tokyo 192-0015, Japan
| | - Kiyotake Suenaga
- Department of Chemistry, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan.
| |
Collapse
|
7
|
Ghosh AK, Brindisi M. Achmatowicz Reaction and its Application in the Syntheses of Bioactive Molecules. RSC Adv 2016; 6:111564-111598. [PMID: 28944049 PMCID: PMC5603243 DOI: 10.1039/c6ra22611f] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Substituted pyranones and tetrahydropyrans are structural subunits of many bioactive natural products. Considerable efforts are devoted toward the chemical synthesis of these natural products due to their therapeutic potential as well as low natural abundance. These embedded pyranones and tetrahydropyran structural motifs have been the subject of synthetic interest over the years. While there are methods available for the syntheses of these subunits, there are issues related to regio and stereochemical outcomes, as well as versatility and compatibility of reaction conditions and functional group tolerance. The Achmatowicz reaction, an oxidative ring enlargement of furyl alcohol, was developed in the 1970s. The reaction provides a unique entry to a variety of pyranone derivatives from functionalized furanyl alcohols. These pyranones provide convenient access to substituted tetrahydropyran derivatives. This review outlines general approaches to the synthesis of tetrahydropyrans, covering general mechanistic aspects of the Achmatowicz reaction or rearrangement with an overview of the reagents utilized for the Achmatowicz reaction. The review then focuses on the synthesis of functionalized tetrahydropyrans and pyranones and their applications in the synthesis of natural products and medicinal agents.
Collapse
Affiliation(s)
- Arun K. Ghosh
- Department of Chemistry and Department of Medicinal Chemistry, Purdue University, West Lafayette, IN 47907, USA
| | - Margherita Brindisi
- Department of Chemistry and Department of Medicinal Chemistry, Purdue University, West Lafayette, IN 47907, USA
| |
Collapse
|
8
|
Leahy JW, Brzezinski LJ. A synthetic approach to the phorboxazoles—synthesis of the exocyclic fragment. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.08.090] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
9
|
Ding C, Wang L, Chen H, Wild C, Ye N, Ding Y, Wang T, White MA, Shen Q, Zhou J. ent-Kaurane-based regio- and stereoselective inverse electron demand hetero-Diels-Alder reactions: synthesis of dihydropyran-fused diterpenoids. Org Biomol Chem 2015; 12:8442-52. [PMID: 25225052 DOI: 10.1039/c4ob01040j] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A mild and concise approach for the construction of a 3,4-dihydro-2H-pyran ring integrated into the A-ring of the natural product oridonin using an optimized inverse electron demand hetero-Diels-Alder (IED HDA) reaction is reported herein. A self-dimerization of the exocyclic enone installed in the A-ring through a homo-HDA reaction was identified to exclusively give a dimeric ent-kaurane diterpenoid with the spirochroman core. Moreover, efficient cross-HDA cycloadditions of this enone with various vinyl ethers or vinyl sulfides, instead of its own homo-HDA dimerization, were achieved in a regio- and stereoselective manner, thus providing access to novel dihydropyran-fused diterpenoids as potential anticancer agents to overcome chemoresistance.
Collapse
Affiliation(s)
- Chunyong Ding
- Chemical Biology Program, Department of Pharmacology and Toxicology, University of Texas Medical Branch, Galveston, TX 77555, USA.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
10
|
Raju KB, Kumar BN, Kumar BS, Nagaiah K. Towards Stereoselective Synthesis of the C(31)-C(39) and C(20)-C(27) Fragments of Phorboxazole A. Helv Chim Acta 2015. [DOI: 10.1002/hlca.201400279] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
11
|
Akula M, Thigulla Y, Davis C, Jha M, Bhattacharya A. Synthesis of 4-substituted oxazolo[4,5-c]quinolines by direct reaction at the C-4 position of oxazoles. Org Biomol Chem 2015; 13:2600-5. [DOI: 10.1039/c4ob02224f] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Cu(TFA)2 catalysed synthesis of 4-arylsubstituted oxazolo[4,5-c]quinolines/[1,8] naphthyridines has been described via a modified Pictet–Spengler method, without prefunctionalization of the unreactive 4th position of oxazoles.
Collapse
Affiliation(s)
- Mahesh Akula
- Department of Chemistry
- Birla Institute of Technology and Science-Pilani (Hyderabad Campus)
- Hyderabad-500078
- India
| | - Yadagiri Thigulla
- Department of Chemistry
- Birla Institute of Technology and Science-Pilani (Hyderabad Campus)
- Hyderabad-500078
- India
| | - Connor Davis
- Department of Biology and Chemistry
- Nipissing University
- North Bay
- Canada P1B 8L7
| | - Mukund Jha
- Department of Biology and Chemistry
- Nipissing University
- North Bay
- Canada P1B 8L7
| | - Anupam Bhattacharya
- Department of Chemistry
- Birla Institute of Technology and Science-Pilani (Hyderabad Campus)
- Hyderabad-500078
- India
| |
Collapse
|
12
|
Abstract
Benzoquinone ansamycin antibiotic herbimycin A was synthesized in 19 linear steps and 4.2% yield. Highlighted is the design of a chiral γ-lactone as the C11-C15 synthon that enabled a facile catalytic asymmetric synthesis of the challenging C8-C20 fragment of the target molecule. The easy access to the stereogenic centers and high overall yield made the strategy applicable in the molecular editing of benzoquinone ansamycins.
Collapse
Affiliation(s)
- Rui Yan
- State Key Laboratory of Bioactive Substance and Function of Natural Medicine, Institute of Materia Medica, Peking Union Medical College & Chinese Academy of Medical Sciences , No. 1 Xiannongtan Street, Beijing 100050, China
| | | | | |
Collapse
|
13
|
Uehling MR, Rucker RP, Lalic G. Catalytic Anti-Markovnikov Hydrobromination of Alkynes. J Am Chem Soc 2014; 136:8799-803. [DOI: 10.1021/ja503944n] [Citation(s) in RCA: 90] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Mycah R. Uehling
- Department of Chemistry, University of Washington, Seattle, Washington 98195, United States
| | - Richard P. Rucker
- Department of Chemistry, University of Washington, Seattle, Washington 98195, United States
| | - Gojko Lalic
- Department of Chemistry, University of Washington, Seattle, Washington 98195, United States
| |
Collapse
|
14
|
Sarmah B, Baishya G, Baruah RK. First example of a Prins–Ritter reaction on terpenoids: a diastereoselective route to novel 4-amido-octahydro-2H-chromenes. RSC Adv 2014. [DOI: 10.1039/c4ra02124j] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
|
15
|
Prudhvi Raju N, Jagan Mohan Reddy B, Anjibabu R, Muralikrishna K, Subba Reddy B. A simple and expeditious synthesis of 2,3,6-trisubstituted tetrahydropyrans through (3,5)-oxonium-ene cyclization using molecular iodine. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.04.104] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
16
|
Han X, Peh G, Floreancig PE. Prins-Type Cyclization Reactions in Natural Product Synthesis. European J Org Chem 2013. [DOI: 10.1002/ejoc.201201557] [Citation(s) in RCA: 163] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
17
|
Hussain H, Green IR, Krohn K, Ahmed I. Advances in the total synthesis of biologically important callipeltosides: a review. Nat Prod Rep 2013; 30:640-93. [DOI: 10.1039/c3np20110d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
18
|
Clarke PA, Ermanis K. Synthesis of the C20–C32 Tetrahydropyran Core of the Phorboxazoles and the C22 Epimer via a Stereodivergent Michael Reaction. Org Lett 2012; 14:5550-3. [DOI: 10.1021/ol3026523] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Paul A. Clarke
- Department of Chemistry, University of York, Heslington, York YO10 5DD, United Kingdom
| | - Kristaps Ermanis
- Department of Chemistry, University of York, Heslington, York YO10 5DD, United Kingdom
| |
Collapse
|
19
|
Kuntiyong P, Lee TH, Kranemann CL, White JD. Total synthesis of the marine toxin phorboxazole A using palladium(II)-mediated intramolecular alkoxycarbonylation for tetrahydropyran synthesis. Org Biomol Chem 2012; 10:7884-99. [PMID: 22910851 DOI: 10.1039/c2ob25766a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The potent antitumor agent phorboxazole A was synthesized from six subunits comprising C1-C2 (115), C3-C8 (98), C9-C19 (74), C20-C32 (52), C33-C41 (84) and C42-C46 (85). Tetrahydropyrans B and C containing cis-2,6-disubstitution were fabricated via palladium(II)-mediated intramolecular alkoxycarbonylation which, in the case of tetrahydropyran C, was carried out with catalytic palladium(II) and p-benzoquinone as the stoichiometric re-oxidant. Tetrahydropyran D was obtained by a stereoselective tin(IV)-catalyzed coupling of a C9 aldehyde with an allylsilane, and the C19-C20 connection was made using a completely stereoselective Wittig-Schlosser (E) olefination. Coupling of the oxazole C32 methyl substituent with the intact C33-C46 δ-lactone 3was accompanied by elimination of the vinyl bromide to a terminal alkyne, but the C32-C33 linkage was implemented successfully with 83 and C33-C41 lactone 84. The C42-C46 segment of the side chain was then appended via Julia-Kocienski olefination. The macrolide portion of phorboxazole A was completed by means of an Ando-Still-Gennari intramolecular (Z)-selective olefination at C2-C3 which required placement of a (dimethoxyphosphinyl)acetate moiety at C24. Final deprotection led to phorboxazole A via a route in which the longest linear sequence is 37 steps and the overall yield is 0.36%.
Collapse
Affiliation(s)
- Punlop Kuntiyong
- Department of Chemistry, Oregon State University, Corvallis, Oregon, USA
| | | | | | | |
Collapse
|
20
|
Reddy BS, Anjum SR, Reddy GM, Yadav J. A novel tandem ene/Prins cyclization for the synthesis of octahydropyrano[2,3-c]pyrrole derivatives. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.01.117] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
|
21
|
M. Stoltz B, D. Caspi D, Zhang H, C. Virgil S, M. Piller F. Rapid and Convergent Synthesis of a 2,4’-Linked Tri-oxazole in an Approach to Poly-oxazoles. HETEROCYCLES 2012. [DOI: 10.3987/com-12-s(n)118] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
22
|
|
23
|
Gormisky PE, White MC. Synthetic versatility in C-H oxidation: a rapid approach to differentiated diols and pyrans from simple olefins. J Am Chem Soc 2011; 133:12584-9. [PMID: 21744821 PMCID: PMC3182113 DOI: 10.1021/ja206013j] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Conventionally, C-H oxidation reactions are used to install functional groups. The use of C-H oxidation to transform simple starting materials into highly versatile intermediates, which enable rapid access to a range of complex target structures, is a new area with tremendous potential in synthesis. Herein we report a Pd(II)/sulfoxide-catalyzed allylic C-H oxidation to form anti-1,4-dioxan-2-ones from homoallylic oxygenates. These versatile building blocks are rapidly elaborated to differentiated syn-1,2-diols, stereodefined amino-polyols, and syn-pyrans, structures ubiquitous in medicinally important complex molecules found in Nature. We also demonstrate that a C-H oxidation approach to the synthesis of these motifs is orthogonal and complementary to other state-of-the-art methods.
Collapse
Affiliation(s)
- Paul E. Gormisky
- Roger Adams Laboratory, Department of Chemistry, University of Illinois, Urbana, Illinois 61801
| | - M. Christina White
- Roger Adams Laboratory, Department of Chemistry, University of Illinois, Urbana, Illinois 61801
| |
Collapse
|
24
|
Smith AB, Hogan AML, Liu Z, Razler TM, Meis RM, Morinaka BI, Molinski TF. Phorboxazole Synthetic Studies: Design, Synthesis and Biological Evaluation of Phorboxazole A and Hemi-Phorboxazole A Related Analogues. Tetrahedron 2011; 67:5069-5078. [PMID: 21811346 PMCID: PMC3146768 DOI: 10.1016/j.tet.2010.12.043] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The design, synthesis and biological evaluation of a new phorboxazole analogue, comprising an acetal replacement for the C-ring tetrahdropyran of the natural product and carrying a potency-enhancing C(45-46) vinyl chloride side chain, is described. In addition, the synthesis of (+)-hemi-phorboxazole A and a series of related hemi-phorboxazole A analogues has been achieved. The new acetal ring replacement analogue displayed activity comparable to that of the parent natural product against HCT-116 (colon) cells (IC(50) 2.25 ng/mL). Equally important, the phorboxazole analogue and two related hemiphorboxazole A congeners exhibited significant antifungal activity when assayed against pathogenic Candida albicans strains.
Collapse
Affiliation(s)
- Amos B. Smith
- Department of Chemistry, Laboratory for Research on the Structure of Matter and Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Anne-Marie L. Hogan
- Department of Chemistry, Laboratory for Research on the Structure of Matter and Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Zhuqing Liu
- Department of Chemistry, Laboratory for Research on the Structure of Matter and Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Thomas M. Razler
- Department of Chemistry, Laboratory for Research on the Structure of Matter and Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Regina M. Meis
- Department of Chemistry, Laboratory for Research on the Structure of Matter and Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Brandon I. Morinaka
- Department of Chemistry and Biochemistry, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093
| | - Tadeusz F. Molinski
- Department of Chemistry and Biochemistry, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093
- Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, 9500 Gilman Drive, La Jolla, California 92093
| |
Collapse
|
25
|
Abstract
The total synthesis of bryostatin 9 was accomplished using a uniquely step-economical and convergent Prins-driven macrocyclization strategy. At 25 linear and 42 total steps, this is currently the most concise and convergent synthesis of a potent bryostatin.
Collapse
Affiliation(s)
- Paul A Wender
- Department of Chemistry, Stanford University, Stanford, California 94305-5080, USA.
| | | |
Collapse
|
26
|
Abstract
A total synthesis of (-)-callipeltoside A (1) has been achieved. The core macrocycle was made via a dual macrolactonization/pyran hemiketal formation reaction, developed to circumvent issues related to the reversible nature of acylketene formation from β-keto lactone substrates. Initial approaches to the core of the natural product that revolved around ring-closing metathesis (RCM) and relay ring-closing metathesis (RRCM) reactions are also described.
Collapse
Affiliation(s)
- Thomas R Hoye
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States.
| | | | | | | |
Collapse
|
27
|
Clarke PA, Santos S, Mistry N, Burroughs L, Humphries AC. The Asymmetric Maitland−Japp Reaction and Its Application to the Construction of the C1−C19 Bis-pyran Unit of Phorboxazole B. Org Lett 2011; 13:624-7. [DOI: 10.1021/ol102860r] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Paul A. Clarke
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, U.K., and Department of Chemistry, AstraZeneca R&D Charnwood, Bakewell Road, Loughborough, Leicestershire, LE11 5RH, U.K
| | - Soraia Santos
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, U.K., and Department of Chemistry, AstraZeneca R&D Charnwood, Bakewell Road, Loughborough, Leicestershire, LE11 5RH, U.K
| | - Nimesh Mistry
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, U.K., and Department of Chemistry, AstraZeneca R&D Charnwood, Bakewell Road, Loughborough, Leicestershire, LE11 5RH, U.K
| | - Laurence Burroughs
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, U.K., and Department of Chemistry, AstraZeneca R&D Charnwood, Bakewell Road, Loughborough, Leicestershire, LE11 5RH, U.K
| | - Alexander C. Humphries
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, U.K., and Department of Chemistry, AstraZeneca R&D Charnwood, Bakewell Road, Loughborough, Leicestershire, LE11 5RH, U.K
| |
Collapse
|
28
|
Wang B, Hansen TM, Weyer L, Wu D, Wang T, Christmann M, Lu Y, Ying L, Engler MM, Cink RD, Lee CS, Ahmed F, Forsyth CJ. Total Synthesis of Phorboxazole A via de Novo Oxazole Formation: Convergent Total Synthesis. J Am Chem Soc 2010; 133:1506-16. [DOI: 10.1021/ja1089099] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
29
|
Wang B, Hansen TM, Wang T, Wu D, Weyer L, Ying L, Engler MM, Sanville M, Leitheiser C, Christmann M, Lu Y, Chen J, Zunker N, Cink RD, Ahmed F, Lee CS, Forsyth CJ. Total Synthesis of Phorboxazole A via de Novo Oxazole Formation: Strategy and Component Assembly. J Am Chem Soc 2010; 133:1484-505. [DOI: 10.1021/ja108906e] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
30
|
Synthetic studies on the phorboxazoles: a short synthesis of an epi-C23 tetrahydropyran core. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.07.012] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
31
|
Liégault B, Petrov I, Gorelsky SI, Fagnou K. Modulating reactivity and diverting selectivity in palladium-catalyzed heteroaromatic direct arylation through the use of a chloride activating/blocking group. J Org Chem 2010; 75:1047-60. [PMID: 20073523 DOI: 10.1021/jo902515z] [Citation(s) in RCA: 256] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Through the introduction of an aryl chloride substituent, the selectivity of palladium-catalyzed direct arylation may be diverted to provide alternative regioisomeric products in high yields. In cases where low reactivity is typically observed, the presence of the carbon-chlorine bond can serve to enhance reactivity and provide superior outcomes. From a strategic perspective, the C-Cl bond is easily introduced and can be employed in a variety of subsequent transformations to provide a wealth of highly functionalized heterocycles with minimal substrate preactivation. The impact of the C-Cl functional group on direct arylation reactivity has also been evaluated mechanistically, and the observed reactivity profiles correlate very well with that predicted by a concerted metalation-deprotonation pathway.
Collapse
Affiliation(s)
- Benoît Liégault
- Centre for Catalysis Research & Innovation, Department of Chemistry, University of Ottawa, 10 Marie Curie, Ottawa, Ontario K1N 6N5, Canada.
| | | | | | | |
Collapse
|
32
|
Jung SI, Tam NT, Cho CG. Bromination/Hydrolytic Fragmentation Reactions of α,β-Unsaturated N-Boc Lactams for the Synthesis of ω-Amino-trisubstituted (E)-Vinyl Bromides. B KOREAN CHEM SOC 2009. [DOI: 10.5012/bkcs.2009.30.12.2863] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
33
|
Smith AB, Liu Z, Hogan AML, Dalisay DS, Molinski TF. Hemi-phorboxazole a: structure confirmation, analogue design and biological evaluation. Org Lett 2009; 11:3766-9. [PMID: 19637861 DOI: 10.1021/ol9014317] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A synthesis providing totally synthetic (+)-hemi-phorboxazole A (1), proceeding in two steps (85% yield) from known vinyl iodide precursor (+)-2, has been achieved in conjunction with the design, synthesis, and biological evaluation of two hemi-phorboxazole analogues [(+)-3 and (-)-4] featuring ring replacements inscribed within the macrolide. Although hemi-phorboxazole A (1) displayed no activity when tested against Candida albicans and two human cancer cell lines, analogue (-)-4 exhibited significant tumor cell growth inhibitory activity in the nanomolar range against HCT-116 (colon) and SK-BR-3 (breast), while (+)-3 displayed promising antifungal activity against C. albicans.
Collapse
Affiliation(s)
- Amos B Smith
- Department of Chemistry, Laboratory for Research on the Structure of Matter, and Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
| | | | | | | | | |
Collapse
|
34
|
Dalisay DS, Molinski TF. Structure Elucidation at the Nanomole Scale. 2. Hemi-phorboxazole A from Phorbas sp. Org Lett 2009; 11:1967-70. [DOI: 10.1021/ol9004189] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Doralyn S. Dalisay
- Department of Chemistry and Biochemistry and Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093
| | - Tadeusz F. Molinski
- Department of Chemistry and Biochemistry and Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, 9500 Gilman Drive, La Jolla, California 92093
| |
Collapse
|
35
|
Li Q, Hu X, Li W, Yang F, Yang X, Sun L, Zhou L, Qi J, Yu Y. Preparation of 5-oxo-5, 6, 7, 8-tetrahydro-4 H-benzo-[b]-pyran Derivatives in Ionic Liquids. JOURNAL OF CHEMICAL RESEARCH 2008. [DOI: 10.3184/030823408x324661] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A novel preparation of 5-oxo-5,6,7,8-tetrahydro-4 H-benzo-[b]-pyran derivatives promoted by InCl3·4H2O/TMSCl in ionic liquid ([bmin]BF4) is described. The preparative procedure presented in this paper is operationally simple and environmentally friendly. The reaction media and catalyst used can be recovered and reused for at least four times without loss in the catalytic activity. This method is promising for a mass-production process.
Collapse
Affiliation(s)
- Qiang Li
- Chongqing University of Medical Sciences, Chongqing 400016, P. R. China
| | - Xueyuan Hu
- Chongqing University of Medical Sciences, Chongqing 400016, P. R. China
| | - Wei Li
- Chongqing University of Medical Sciences, Chongqing 400016, P. R. China
| | - Fei Yang
- Chongqing University of Medical Sciences, Chongqing 400016, P. R. China
| | - Xiaolan Yang
- Chongqing University of Medical Sciences, Chongqing 400016, P. R. China
| | - Lili Sun
- Chongqing University of Medical Sciences, Chongqing 400016, P. R. China
| | - Liping Zhou
- Chongqing University of Medical Sciences, Chongqing 400016, P. R. China
| | - Junsheng Qi
- Chongqing University of Medical Sciences, Chongqing 400016, P. R. China
| | - Yu Yu
- Chongqing University of Medical Sciences, Chongqing 400016, P. R. China
| |
Collapse
|
36
|
Smith AB, Fox RJ, Razler TM. Evolution of the Petasis-Ferrier union/rearrangement tactic: construction of architecturally complex natural products possessing the ubiquitous cis-2,6-substituted tetrahydropyran structural element. Acc Chem Res 2008; 41:675-87. [PMID: 18489082 DOI: 10.1021/ar700234r] [Citation(s) in RCA: 101] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The frequent low abundance of architecturally complex natural products possessing significant bioregulatory properties mandates the development of rapid, efficient, and stereocontrolled synthetic tactics, not only to provide access to the biologically rare target but also to enable elaboration of analogues for the development of new therapeutic agents with improved activities and/or pharmacokinetic properties. In this Account, the genesis and evolution of the Petasis-Ferrier union/rearrangement tactic, in the context of natural product total syntheses, is described. The reaction sequence comprises a powerful tactic for the construction of the 2,6- cis-substituted tetrahydropyran ring system, a ubiquitous structural element often found in complex natural products possessing significant bioactivities. The three-step sequence, developed in our laboratory, extends two independent methods introduced by Ferrier and Petasis and now comprises: condensation between a chiral, nonracemic beta-hydroxy acid and an aldehyde to furnish a dioxanone; carbonyl olefination; and Lewis-acid-induced rearrangement of the resultant enol acetal to generate the 2,6- cis-substituted tetrahydropyranone system in a highly stereocontrolled fashion. To demonstrate the envisioned versatility and robustness of the Petasis-Ferrier union/rearrangement tactic in complex molecule synthesis, we exploited the method as the cornerstone in our now successful total syntheses of (+)-phorboxazole A, (+)-zampanolide, (+)-dactylolide, (+)-spongistatins 1 and 2, (-)-kendomycin, (-)-clavosolide A, and most recently, (-)-okilactomycin. Although each target comprises a number of synthetic challenges, this Account focuses on the motivation, excitement, and frustrations associated with the evolution and implementation of the Petasis-Ferrier union/rearrangement tactic. For example, during our (+)-phorboxazole A endeavor, we recognized and exploited the inherent pseudo symmetry of the 2,6- cis-substituted tetrahydropyranone product to overcome the inherent chelation bias of an adjacent oxazolidine ring during the Lewis-acid-promoted rearrangement. In addition, we discovered that a more concentrated solution of Cp2TiMe2 (0.7 versus 0.5 M in THF) with the addition of ethyl pivalate dramatically improves the yield in the Petasis-Tebbe olefination. During the (+)-zampanolide and (+)-dactylolide programs, we observed that the addition of trifluoromethanesulfonic acid (TfOH), especially on a preparative scale, was crucial to the efficiency of the initial condensation/union reaction, while our efforts toward (-)-kendomycin led to the improved implementation of a modified Kurihara condensation of the beta-hydroxy acid and aldehyde involving i-PrOTMS and TMSOTf. Finally, the successful deployment of the Petasis-Ferrier tactic in our synthesis of (-)-clavosolide A validated the viability of this tactic with a system possessing the highly acid-labile cyclopropylcarbinyl moiety, while the challenges en route to (-)-okilactomycin demonstrated that a neighboring alkene functionality can participate in an intramolecular Prins cyclization during the TMSOTf-promoted union process, unless suitably protected.
Collapse
Affiliation(s)
- Amos B. Smith
- Department of Chemistry, Monell Chemical Senses Center, and Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Richard J. Fox
- Department of Chemistry, Monell Chemical Senses Center, and Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Thomas M. Razler
- Department of Chemistry, Monell Chemical Senses Center, and Laboratory for Research on the Structure of Matter, University of Pennsylvania, Philadelphia, Pennsylvania 19104
| |
Collapse
|
37
|
Smith AB, Razler TM, Ciavarri JP, Hirose T, Ishikawa T, Meis RM. A Second-Generation Total Synthesis of (+)-Phorboxazole A. J Org Chem 2008; 73:1192-200. [DOI: 10.1021/jo7018152] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Amos B. Smith
- Department of Chemistry, The Penn Center for Molecular Discovery, and Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Thomas M. Razler
- Department of Chemistry, The Penn Center for Molecular Discovery, and Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Jeffrey P. Ciavarri
- Department of Chemistry, The Penn Center for Molecular Discovery, and Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Tomoyasu Hirose
- Department of Chemistry, The Penn Center for Molecular Discovery, and Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Tomoyasu Ishikawa
- Department of Chemistry, The Penn Center for Molecular Discovery, and Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Regina M. Meis
- Department of Chemistry, The Penn Center for Molecular Discovery, and Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, Pennsylvania 19104
| |
Collapse
|
38
|
Linder J, Blake AJ, Moody CJ. Total synthesis of siphonazole and its O-methyl derivative, structurally unusual bis-oxazole natural products. Org Biomol Chem 2008; 6:3908-16. [DOI: 10.1039/b810855b] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
39
|
Nasveschuk CG, Rovis T. The [1, 3] O-to-C rearrangement: opportunities for stereoselective synthesis. Org Biomol Chem 2007; 6:240-54. [PMID: 18174990 DOI: 10.1039/b714881j] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The relay of stereochemistry of a breaking C-O bond into a forming C-C bond is well-known in the context of [3, 3] sigmatropic shifts; however, this useful strategy is less well-known in other types of molecular rearrangements. Though the first successful example of a [1, 3] O-to-C rearrangement was reported more than 100 years ago, this class of reactions has received less attention than its [3, 3] counterpart. This perspective analyzes the various methods used for the activation and [1, 3] rearrangement of vinyl ethers with an emphasis on mechanism and applications to stereoselective synthesis. We also highlight our own contributions to this area.
Collapse
|
40
|
Vaz B, Domínguez M, Alvarez R, de Lera AR. Total Synthesis of Peridinin and Related C37-Norcarotenoid Butenolides. Chemistry 2007; 13:1273-90. [PMID: 17066395 DOI: 10.1002/chem.200600959] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
As an extension of our synthesis of symmetrical carotenoids, the preparation of the highly functionalized C37-norcarotenoid butenolide peridinin (1), its 6'-epi- and 11'Z stereoisomers has been completed. Featuring a central dihalogenated C8 linchpin unit 6, two synthetic routes, differing in the ordering of the last three steps were explored by using the C3,C3'-bisdehydroxylated target as the model system. The first route uses the combination of a modified Z-selective Julia reaction and two sequential Stille couplings, the last one producing the isomerisation of the polyene Z double bond. The second route inverts these steps and makes the isolation of the 11'Z stereoisomers as major products possible. An efficient Z to E isomerisation of the final carotenoid skeleton simply uses the Stille reaction conditions at ambient temperature. As the reaction of bromoallene 12 with alkenylstannane 11 occurs with inversion of configuration, 6'-epi-peridinin could also be prepared by route A. The advantages and limitations of the sequential Stille cross-coupling approach to carotenoids are highlighted.
Collapse
Affiliation(s)
- Belén Vaz
- Department of Organic Chemistry, Universidade de Vigo, As Lagoas-Marcosende, 36310 Vigo, Spain
| | | | | | | |
Collapse
|
41
|
White JD, Kuntiyong P, Lee TH. Total Synthesis of Phorboxazole A. 1. Preparation of Four Subunits. Org Lett 2006; 8:6039-42. [PMID: 17165924 DOI: 10.1021/ol062530r] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[Structure: see text] Four subunits of the potent antitumor agent phorboxazole A were constructed; fragments C20-C32 and C9-C19 containing tetrahydropyrans A and B, respectively, were assembled using palladium-catalyzed intramolecular alkoxycarbonylation.
Collapse
Affiliation(s)
- James D White
- Department of Chemistry, Oregon State University, Corvallis, Oregon 97331, USA.
| | | | | |
Collapse
|
42
|
White JD, Lee TH, Kuntiyong P. Total Synthesis of Phorboxazole A. 2. Assembly of Subunits and Completion of the Synthesis. Org Lett 2006; 8:6043-6. [PMID: 17165925 DOI: 10.1021/ol062531j] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[Structure: see text] Subunits of phorboxazole A containing C1-C2, C3-C8, C9-C19, C20-C32, C33-C41, and C42-C46 were connected in a sequence that first linked C32 with C33 and then C41 with C42. A C3-C8 fragment was joined to C9-C19, and the assembled unit was then joined with the left half of 1. Closure of the macrolide was accomplished by esterification of the C24 alcohol followed by intramolecular Horner-Wadsworth-Emmons condensation to set the (E)-C2-C3 alkene.
Collapse
Affiliation(s)
- James D White
- Department of Chemistry, Oregon State University, Corvallis, Oregon 97331, USA.
| | | | | |
Collapse
|
43
|
Abstract
An effective, readily scalable two-step synthesis of trisubstituted (E)-vinyl bromides involving bromination of alpha,beta-unsaturated lactones followed by hydrolytic fragmentation has been developed. Several trisubstituted (E)-vinyl bromides, including multigram quantities of (+)-(E)-4-bromo-2-methyl-3-pentenol, a synthetic intermediate required for the C(8)-C(11) moieties of (+)-tedanolide (1) and (+)-13-deoxytedanolide (2), illustrate the utility of this protocol. [reaction: see text]
Collapse
Affiliation(s)
- Cheon-Gyu Cho
- Department of Chemistry, Hanyang University, Seoul, Korea 133-791.
| | | | | |
Collapse
|
44
|
Chen J, Ying L, Hansen TM, Engler MM, Lee CS, La Clair JJ, Forsyth CJ. Design and total synthesis of a fluorescent phorboxazole a analog for cellular studies. Bioorg Med Chem Lett 2006; 16:901-4. [PMID: 16300946 DOI: 10.1016/j.bmcl.2005.10.109] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2005] [Revised: 10/29/2005] [Accepted: 10/31/2005] [Indexed: 11/15/2022]
Abstract
To enable studies to elucidate the intracellular processing and targeting of the potent cytostatic/apoptotic anticancer natural products phorboxazoles A and B, a fluorescent derivative has been developed. This involved the total syntheses of the terminal alkyne 33-O-Me-45,46-dehydrobromophorboxazole A (MDHBPA) and a terminal vinyl iodide derivative of the blue fluorescent dye N,N,-dimethyl-7-aminocoumarin (DMC). Sonogashira coupling of these partners provided enyne DMC-MDHBPA in high yield.
Collapse
Affiliation(s)
- Jiehao Chen
- Department of Chemistry, University of Minnesota, Minneapolis, MN 55455, USA
| | | | | | | | | | | | | |
Collapse
|
45
|
Li DR, Zhang DH, Sun CY, Zhang JW, Yang L, Chen J, Liu B, Su C, Zhou WS, Lin GQ. Total Synthesis of Phorboxazole B. Chemistry 2006; 12:1185-204. [PMID: 16267861 DOI: 10.1002/chem.200500892] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
An efficient and highly convergent total synthesis of the potent antitumor agent phorboxazole B has been achieved. The synthetic strategy of this synthesis features: 1) a highly efficient substrate-controlled hydrogenation to construct the functionalized cis-tetrahydropyrane unit; 2) iterative crotyl addition to synthesize the segment that contains alternating hydroxyl and methyl substituents; 3) Hg(OAc)2/I2-induced cyclization to establish the cis-tetrahydropyrane moiety; 4) 1,3-asymmetric induction in the Mukaiyama aldol reaction to afford the stereogenic centers at C9 and C3; and 5) the exploration of the Still-Gennari olefination reaction to complete the macrolide ring of phorboxazoloe B.
Collapse
Affiliation(s)
- De-Run Li
- Shanghai Institute of Organic Chemistry, 354 Fenglin Rd, Shanghai 200032, PR China
| | | | | | | | | | | | | | | | | | | |
Collapse
|
46
|
Abstract
The C1-C17 bis-oxane subunit 22 of phorboxazole B is efficiently synthesized by exploiting differential reactivities between similar substituents on the hydropyran rings in 4. Selective dihydroxylation of the equatorial vinyl group, hydroboration of the axial vinyl group, and intramolecular Mitsunobu lactonization serve to fully differentiate the similar hydropyrans.
Collapse
Affiliation(s)
- Brian S Lucas
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706-1396, USA
| | | | | |
Collapse
|
47
|
Smith AB, Razler TM, Ciavarri JP, Hirose T, Ishikawa T. (+)-Phorboxazole A Synthetic Studies. A Highly Convergent, Second Generation Total Synthesis of (+)-Phorboxazole A. Org Lett 2005; 7:4399-402. [PMID: 16178543 DOI: 10.1021/ol051584i] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[structure: see text] A second generation total synthesis of the potent antitumor agent (+)-phorboxazole A (1) has been achieved. The cornerstone of this approach comprises a more convergent strategy, involving late-stage Stille union of a fully elaborated C(1-28) macrocycle with a C(29-46) side chain. The second generation synthesis entails the longest linear sequence of 24 steps, with an overall yield of 4.2%.
Collapse
Affiliation(s)
- Amos B Smith
- Department of Chemistry, Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
| | | | | | | | | |
Collapse
|
48
|
Smith AB, Razler TM, Pettit GR, Chapuis JC. (+)-Phorboxazole A Synthetic Studies. Identification of a Series of Highly Cytotoxic C(45−46) Analogues. Org Lett 2005; 7:4403-6. [PMID: 16178544 DOI: 10.1021/ol051585a] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[structure: see text] Effective, scalable total syntheses and biological evaluation of six phorboxazole A analogues (1-6) have been achieved. Importantly, the C(45-46)-saturated, C(45-46)-alkenyl, and the C(45-46)-E-chloroalkenyl congeners (4, 5, and 6, respectively) reveal low nanomolar tumor cell growth inhibitory activity (GI50's) similar to or, in some cell lines, greater than that of the phorboxazoles across a diverse panel of human cancer cell lines.
Collapse
Affiliation(s)
- Amos B Smith
- Department of Chemistry, Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
| | | | | | | |
Collapse
|
49
|
Ramachandran PV, Prabhudas B, Chandra JS, Reddy MVR. Diastereoselective dihydroxylation and regioselective deoxygenation of dihydropyranones: a novel protocol for the stereoselective synthesis of C1-C8 and C15-C21 subunits of (+)-discodermolide. J Org Chem 2005; 69:6294-304. [PMID: 15357588 DOI: 10.1021/jo0492416] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Diastereoselective dihydroxylation of dihydropyranones and subsequent regioselective alpha-deoxygenation provides 1,3-trans-beta-hydroxy-delta-lactones stereoselectively. This protocol has been applied for the synthesis of C(1)-C(8) and C(15)-C(21) subunits of (+)-discodermolide.
Collapse
Affiliation(s)
- P Veeraraghavan Ramachandran
- Herbert C. Brown Center for Borane Research, 560 Oval Drive, Department of Chemistry, Purdue University, West Lafayette, Indiana 47907-2084, USA.
| | | | | | | |
Collapse
|
50
|
Lucas BS, Luther LM, Burke SD. A Catalytic Enantioselective Hetero Diels−Alder Approach to the C20−C32 Segment of the Phorboxazoles. J Org Chem 2005; 70:3757-60. [PMID: 15845024 DOI: 10.1021/jo050034v] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text] An efficient synthesis of the C20-C32 segment of the phorboxazoles has been achieved using an enantioselective hetero Diels-Alder reaction catalyzed by Jacobsen's Cr(III) amino indanol Schiff base catalyst.
Collapse
Affiliation(s)
- Brian S Lucas
- Department of Chemistry, University of Wisconsin, 1101 University Avenue, Madison, Wisconsin 53706-1396, USA
| | | | | |
Collapse
|