1
|
Iqbal N, Ashraf MA, Gul AR, Bae J, Iqbal N, Park TJ, Cho EJ. Construction of a Pentacyclic Framework Enabled by Nickel Catalysis. Org Lett 2023; 25:647-652. [PMID: 36682059 DOI: 10.1021/acs.orglett.2c04228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
We present a novel nickel-catalyzed reaction of indole-tethered 2-alkynylphenol esters with various (hetero)aryl boronic acids, resulting in the synthesis of diversely functionalized pentacyclic benzofurocyclohepta[b]indole derivatives. This unprecedented cascade reaction involves the arylative cyclization of alkynes, nucleophilic attack of the indole moiety on the oxonium ion intermediate, 1,2-alkyl group migration, and aromatization. The synthesized molecules exhibit exceptional cytotoxicity against multiple cancer cell lines while maintaining biocompatibility toward healthy cells.
Collapse
Affiliation(s)
- Naeem Iqbal
- Department of Chemistry, University of York, Heslington, York YO10 5DD, United Kingdom
| | - Muhammad Awais Ashraf
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Anam Rana Gul
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Jaehan Bae
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Naila Iqbal
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Tae Jung Park
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| | - Eun Jin Cho
- Department of Chemistry, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Republic of Korea
| |
Collapse
|
2
|
Fliegel L, Christoffers J. Synthesis of Annulated Benzofuran Derivatives from α-(Iodophenyl)-β-oxoesters. Org Lett 2022. [DOI: 10.1021/acs.orglett.2c03472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Lukas Fliegel
- Institut für Chemie, Universität Oldenburg, D-26111 Oldenburg, Germany
| | - Jens Christoffers
- Institut für Chemie, Universität Oldenburg, D-26111 Oldenburg, Germany
| |
Collapse
|
3
|
Su YC, Cheng MJ, Weng JR. Cytotoxic polyhydroxylated sterol analogues from Dysidea aff. frondosa. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.132434] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
4
|
Sahu AK, Unnava R, Behera BK, Saikia AK. Synthesis of dibenzocyclohepta[1,2-a]naphthalene derivatives from phenylacetaldehyde and alkynyl benzyl alcohols via sequential electrophilic addition and double Friedel-Crafts reactions. Org Biomol Chem 2021; 19:2430-2435. [PMID: 33662089 DOI: 10.1039/d1ob00057h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A simple methodology has been developed for the synthesis of substituted 9H-dibenzo[3,4:6,7]-cyclohepta[1,2-a]naphthalenes from phenylacetaldehydes and ortho-alkynyl benzyl alcohols in the presence of a Lewis acid in moderate to good yields within a short reaction time. Interestingly, the reaction proceeds through a highly regioselective electrophilic addition followed by double Friedel-Crafts reaction to form uncommon dibenzo-fused seven-membered carbocycles.
Collapse
Affiliation(s)
- Archana K Sahu
- Department of Chemistry, Indian Institute of Technology, Guwahati, Guwahati 781039, Assam, India.
| | | | | | | |
Collapse
|
5
|
García PA, Hernández ÁP, San Feliciano A, Castro MÁ. Bioactive Prenyl- and Terpenyl-Quinones/Hydroquinones of Marine Origin †. Mar Drugs 2018; 16:E292. [PMID: 30134616 PMCID: PMC6165040 DOI: 10.3390/md16090292] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2018] [Revised: 08/15/2018] [Accepted: 08/17/2018] [Indexed: 01/05/2023] Open
Abstract
The sea is a rich source of biological active compounds, among which terpenyl-quinones/hydroquinones constitute a family of secondary metabolites with diverse pharmacological properties. The chemical diversity and bioactivity of those isolated from marine organisms in the last 10 years are summarized in this review. Aspects related to synthetic approaches towards the preparation of improved bioactive analogues from inactive terpenoids are also outlined.
Collapse
Affiliation(s)
- Pablo A García
- Department of Pharmaceutical Sciences, Pharmaceutical Chemistry Section, CIETUS/IBSAL, Faculty of Pharmacy, University of Salamanca, E-37007 Salamanca, Spain.
| | - Ángela P Hernández
- Department of Pharmaceutical Sciences, Pharmaceutical Chemistry Section, CIETUS/IBSAL, Faculty of Pharmacy, University of Salamanca, E-37007 Salamanca, Spain.
| | - Arturo San Feliciano
- Department of Pharmaceutical Sciences, Pharmaceutical Chemistry Section, CIETUS/IBSAL, Faculty of Pharmacy, University of Salamanca, E-37007 Salamanca, Spain.
| | - Mª Ángeles Castro
- Department of Pharmaceutical Sciences, Pharmaceutical Chemistry Section, CIETUS/IBSAL, Faculty of Pharmacy, University of Salamanca, E-37007 Salamanca, Spain.
| |
Collapse
|
6
|
Bejcek LP, Murelli RP. Oxidopyrylium [5+2] Cycloaddition Chemistry: Historical Perspective and Recent Advances (2008-2018). Tetrahedron 2018; 74:2501-2521. [PMID: 30455508 PMCID: PMC6238658 DOI: 10.1016/j.tet.2018.04.006] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Lauren P Bejcek
- Department of Chemistry, Brooklyn College, City University of New York, Brooklyn, NY, Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, New York, NY
| | - Ryan P Murelli
- Department of Chemistry, Brooklyn College, City University of New York, Brooklyn, NY, Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, New York, NY
| |
Collapse
|
7
|
Zong Y, Wang W, Xu T. Total Synthesis of Bioactive Marine Meroterpenoids: The Cases of Liphagal and Frondosin B. Mar Drugs 2018; 16:md16040115. [PMID: 29614734 PMCID: PMC5923402 DOI: 10.3390/md16040115] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2018] [Revised: 03/28/2018] [Accepted: 03/28/2018] [Indexed: 01/09/2023] Open
Abstract
Liphagal and frondosin B are two marine-derived secondary metabolites sharing a very similar polyfused-benzofuran skeleton. The two tetracyclic meroterpenoids were isolated from marine sponges, both featuring a 6-5-7-6 fused ring system. A preliminary bioactive study shows that (+)-liphagal is a selective kinase (PI3K α) inhibitor, while (+)-frondosin B is shown to inhibit the binding of the cytokine interleukin-8 (IL-8) to its receptor, CX-CLR1/2. The unique structures and interesting biological profiles of these two meroterpenoids have attracted considerable attention from synthetic chemists. Herein we summarize the synthetic efforts with respect to (+)-liphagal and (+)-frondosin B during the past two decades.
Collapse
Affiliation(s)
- Yan Zong
- Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao 266003, China.
| | - Weijia Wang
- Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao 266003, China.
| | - Tao Xu
- Key Laboratory of Marine Drugs, Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao 266003, China.
- Laboratory for Marine Drugs and Bioproducts of Qingdao, National Laboratory for Marine Science and Technology (QNLM), 1 Wenhai Road, Qingdao 266237, China.
| |
Collapse
|
8
|
Joyce LA, Nawrat CC, Sherer EC, Biba M, Brunskill A, Martin GE, Cohen RD, Davies IW. Beyond optical rotation: what's left is not always right in total synthesis. Chem Sci 2018; 9:415-424. [PMID: 29629112 PMCID: PMC5868320 DOI: 10.1039/c7sc04249c] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2017] [Accepted: 10/27/2017] [Indexed: 12/02/2022] Open
Abstract
This work describes the application of vibrational (VCD) and electronic (ECD) circular dichroism spectroscopy to solve the longstanding debate around the absolute configuration of (+)-frondosin B (1). The absolute configuration of (+)-1 could confidently be assigned as (R) using these spectroscopic techniques. The discrepancy in the optical rotation (OR) values obtained in previous studies can be attributed to an undetected minor impurity (ca. 7%) that arose unexpectedly in a key step late in the synthesis. Additionally, the conditions used in the final step of the previous reports for demethylation to form the natural product proceeded with significant loss of enantiopurity. The large OR measured for the impurity at its observed level, when compared to the small rotation for the less enantiopure natural product 1, led to a measured OR value for the synthetic material that had the opposite sign of the natural product.
Collapse
Affiliation(s)
- Leo A Joyce
- Department of Process Research & Development , Merck & Co., Inc. , Rahway , NJ 07065 , USA . ;
| | - Christopher C Nawrat
- Department of Process Research & Development , Merck & Co., Inc. , Rahway , NJ 07065 , USA . ;
| | - Edward C Sherer
- Department of Modeling and Informatics , Merck & Co., Inc. , Rahway , NJ 07065 , USA
| | - Mirlinda Biba
- Department of Process Research & Development , Merck & Co., Inc. , Rahway , NJ 07065 , USA . ;
| | - Andrew Brunskill
- Department of Process Research & Development , Merck & Co., Inc. , Rahway , NJ 07065 , USA . ;
| | - Gary E Martin
- Department of Process Research & Development , Merck & Co., Inc. , Rahway , NJ 07065 , USA . ;
| | - Ryan D Cohen
- Department of Process Research & Development , Merck & Co., Inc. , Rahway , NJ 07065 , USA . ;
| | - Ian W Davies
- Department of Process Research & Development , Merck & Co., Inc. , Rahway , NJ 07065 , USA . ;
| |
Collapse
|
9
|
Kwon K, Ham JS, Kim HY, Sampath V, Lee HY. A Formal Total Synthesis of (+)-Frondosin A. ASIAN J ORG CHEM 2017. [DOI: 10.1002/ajoc.201700367] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Kuktae Kwon
- Department of Chemistry; Korea Advanced Institute of Science&Technology (KAIST); 291 Daehak-ro Yuseong-gu Daejeon 34141 Republic of Korea
| | - Jin Su Ham
- Department of Chemistry; Korea Advanced Institute of Science&Technology (KAIST); 291 Daehak-ro Yuseong-gu Daejeon 34141 Republic of Korea
| | - Hyoun Young Kim
- Department of Chemistry; Korea Advanced Institute of Science&Technology (KAIST); 291 Daehak-ro Yuseong-gu Daejeon 34141 Republic of Korea
| | - Vasu Sampath
- Department of Chemistry; Korea Advanced Institute of Science&Technology (KAIST); 291 Daehak-ro Yuseong-gu Daejeon 34141 Republic of Korea
| | - Hee-Yoon Lee
- Department of Chemistry; Korea Advanced Institute of Science&Technology (KAIST); 291 Daehak-ro Yuseong-gu Daejeon 34141 Republic of Korea
| |
Collapse
|
10
|
Huynh KQ, Seizert CA, Ozumerzifon TJ, Allegretti PA, Ferreira EM. Platinum-Catalyzed α,β-Unsaturated Carbene Formation in the Formal Syntheses of Frondosin B and Liphagal. Org Lett 2016; 19:294-297. [PMID: 27997203 DOI: 10.1021/acs.orglett.6b03682] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Formal syntheses of tetracyclic terpenoids frondosin B and liphagal are described. Both synthetic routes rely on the use of platinum-catalyzed α,β-unsaturated carbene formation for the key C-C bond forming transformations. The successful route toward frondosin B utilizes a formal (4 + 3) cycloaddition, while the liphagal synthesis features the vinylogous addition of an enol nucleophile as a key step. Both synthetic routes are discussed, revealing insights into structural requirements in the catalytic α,β-unsaturated carbene reaction manifold.
Collapse
Affiliation(s)
- Khoi Q Huynh
- Department of Chemistry, University of Georgia , Athens, Georgia 30602, United States
| | - Curtis A Seizert
- Department of Chemistry, University of Georgia , Athens, Georgia 30602, United States
| | - Tarik J Ozumerzifon
- Department of Chemistry, University of Georgia , Athens, Georgia 30602, United States
| | - Paul A Allegretti
- Department of Chemistry, University of Georgia , Athens, Georgia 30602, United States
| | - Eric M Ferreira
- Department of Chemistry, University of Georgia , Athens, Georgia 30602, United States
| |
Collapse
|
11
|
The chemistry of the carbon-transition metal double and triple bond: Annual survey covering the year 2015. Coord Chem Rev 2016. [DOI: 10.1016/j.ccr.2016.08.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
|