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Hu YH, Gan ZY, Li QT, Chen YT, Chen ME, Zhang LH, Zou JC, Zhang FM. Spokewise Total Syntheses of Four Erythrina Alkaloids and Telescoped Syntheses of Six Additional Alkaloids. J Org Chem 2024; 89:14164-14176. [PMID: 39291865 DOI: 10.1021/acs.joc.4c01537] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/19/2024]
Abstract
Based on rich sulfur-involving chemical transformations, a novel spokewise synthetic strategy, a subclass of the collective strategies, has been developed to concisely synthesize four erythrina alkaloids through a single-step transformation from a common synthetic precursor. Moreover, six additional erythrina alkaloids have also been synthesized by subsequent 1-2 steps chemical transformations. The current synthetic approaches provide a valuable platform for collective total syntheses of erythrina alkaloids and pseudo-natural erythrina alkaloids.
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Affiliation(s)
- Yue-Hong Hu
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Zhang-Yan Gan
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Qin-Tong Li
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Yu-Ting Chen
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Meng-En Chen
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Ling-Hui Zhang
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Jin-Chi Zou
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Fu-Min Zhang
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
- Key Laboratory of Medicinal Chemistry for Natural Resource (Ministry of Education), Yunnan University, Kunming 650091, P. R. China
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Ma F, Li Y, Akkarasereenon K, Qiu H, Cheung YT, Guo Z, Tong R. Aza-Achmatowicz rearrangement coupled with intermolecular aza-Friedel-Crafts enables total syntheses of uleine and aspidosperma alkaloids. Chem Sci 2024; 15:5730-5737. [PMID: 38638226 PMCID: PMC11023026 DOI: 10.1039/d4sc00601a] [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: 01/25/2024] [Accepted: 03/11/2024] [Indexed: 04/20/2024] Open
Abstract
Aspidosperma and uleine alkaloids belong to the large family of monoterpene indole alkaloids with diverse biological activities and thus have attracted extensive synthetic interest. Reported is the development of a new synthetic strategy that allows direct C3-C2' linkage of indoles with functionalized 2-hydroxypiperidines to construct the core common to all aspidoserma and uleine alkaloids. Such indole-piperidine linkage is enabled by coupling aza-Achmatowicz rearrangement (AAR) with indoles via an intermolecular aza-Friedel-Crafts (iAFC) reaction. This AAR-iAFC reaction proceeds under mild acidic conditions with wide tolerance of functional groups (33 examples). The synthetic application of the AAR-iAFC method was demonstrated with collective total syntheses of 3 uleine-type and 6 aspidosperma alkaloids: (+)-3-epi-N-nor-dasycarpidone, (+)-3-epi-dasycarpidone, (+)-3-epi-uleine, 1,2-didehydropseudoaspidospermidine, 1,2-dehydroaspidospermidine, vincadifformine, winchinine B, aspidospermidine, and N-acetylaspidospermidine. We expect that this AAR-iAFC strategy is applicable to other monoterpene indole alkaloids with the C3-C2' linkage of indoles and piperidines.
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Affiliation(s)
- Foqing Ma
- Department of Chemistry, The Hong Kong University of Science and Technology, Clearwater Bay Kowloon Hong Kong China +86 23581594 +86 23587357
| | - Yunlong Li
- Department of Chemistry, The Hong Kong University of Science and Technology, Clearwater Bay Kowloon Hong Kong China +86 23581594 +86 23587357
| | - Kornkamon Akkarasereenon
- Department of Chemistry, The Hong Kong University of Science and Technology, Clearwater Bay Kowloon Hong Kong China +86 23581594 +86 23587357
| | - Huiying Qiu
- Department of Chemistry, The Hong Kong University of Science and Technology, Clearwater Bay Kowloon Hong Kong China +86 23581594 +86 23587357
| | - Yuen Tsz Cheung
- Department of Chemistry, The Hong Kong University of Science and Technology, Clearwater Bay Kowloon Hong Kong China +86 23581594 +86 23587357
| | - Zhihong Guo
- Department of Chemistry, The Hong Kong University of Science and Technology, Clearwater Bay Kowloon Hong Kong China +86 23581594 +86 23587357
| | - Rongbiao Tong
- Department of Chemistry, The Hong Kong University of Science and Technology, Clearwater Bay Kowloon Hong Kong China +86 23581594 +86 23587357
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Hicks EF, Inoue K, Stoltz BM. Enantioselective Total Synthesis of (-)-Hunterine A Enabled by a Desymmetrization/Rearrangement Strategy. J Am Chem Soc 2024; 146:4340-4345. [PMID: 38346145 PMCID: PMC10885145 DOI: 10.1021/jacs.3c13590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2024]
Abstract
The first enantioselective total synthesis of (-)-hunterine A is disclosed. Our strategy employs a catalytic asymmetric desymmetrization of a symmetrical diketone and subsequent Beckmann rearrangement to construct a 5,6-α-aminoketone. A convergent 1,2-addition joins a vinyl dianion nucleophile and the enantioenriched ketone. The endgame of the synthesis features an aza-Cope/Mannich reaction and azide-olefin dipolar cycloaddition to complete the pentacyclic ring system. The synthesis is completed through a regioselective aziridine ring opening.
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Affiliation(s)
- Elliot F Hicks
- The Warren and Katharine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Kengo Inoue
- The Warren and Katharine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Brian M Stoltz
- The Warren and Katharine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
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Wang HX, Yang C, Xue BY, Xie MS, Tian Y, Peng C, Guo HM. Design of C 1-symmetric tridentate ligands for enantioselective dearomative [3 + 2] annulation of indoles with aminocyclopropanes. Nat Commun 2023; 14:2270. [PMID: 37080997 PMCID: PMC10119320 DOI: 10.1038/s41467-023-38059-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Accepted: 04/12/2023] [Indexed: 04/22/2023] Open
Abstract
Chiral polycyclic indolines are widely present in natural products and have become the focus of extensive synthetic efforts. Here, we show the catalytic asymmetric dearomative [3 + 2] annulation of indoles with donor-acceptor aminocyclopropanes to construct tricyclic indolines. Key to the success of the reaction is the rational design of C1-symmetric bifunctional tridentate imidazoline-pyrroloimidazolone pyridine ligand. Under 5 mol% of Ni(OTf)2-ligand complex, diverse tricyclic indolines containing cyclopentamine moieties are obtained in good chemoselectivities, high diastereoselectivities, and excellent enantioselectivities. An unusual cis-configuration ligand is superior to the trans-configuration ligand and the corresponding C2-symmetric tridentate nitrogen ligands in the annulation reaction. Mechanistic studies by control experiments and density functional theory calculations reveal a dual activation manner, where Ni(II) complex activates the aminocyclopropane via coordination with the geminal diester, and imidazolidine NH forms a H-bond with the succinimide moiety.
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Affiliation(s)
- Hai-Xia Wang
- State Key Laboratory of Antiviral Drugs, Pingyuan Laboratory, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan, 453007, China
| | - Chun Yang
- State Key Laboratory of Antiviral Drugs, Pingyuan Laboratory, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan, 453007, China
| | - Bai-Yu Xue
- State Key Laboratory of Antiviral Drugs, Pingyuan Laboratory, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan, 453007, China
| | - Ming-Sheng Xie
- State Key Laboratory of Antiviral Drugs, Pingyuan Laboratory, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan, 453007, China.
| | - Yin Tian
- State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, 611137, China.
| | - Cheng Peng
- State Key Laboratory of Southwestern Chinese Medicine Resources, School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, 611137, China
| | - Hai-Ming Guo
- State Key Laboratory of Antiviral Drugs, Pingyuan Laboratory, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan, 453007, China.
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Abstract
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The therapeutic properties of Curcuma (ginger
and turmeric’s family) have long been known in traditional
medicine. However, only recently have guaiane-type sesquiterpenes
extracted from Curcuma phaeocaulis been
submitted to biological testing, and their enhanced bioactivity was
highlighted. Among these compounds, phaeocaulisin A has shown remarkable
anti-inflammatory and anticancer activity, which appears to be tied
to the unique bridged acetal moiety embedded in its tetracyclic framework.
Prompted by the promising biological profile of phaeocaulisin A and
by the absence of a synthetic route for its provision, we have implemented
the first enantioselective total synthesis of phaeocaulisin A in 17
steps with 2% overall yield. Our route design builds on the identification
of an enantioenriched lactone intermediate, tailored with both a ketone
moiety and a conjugated alkene system. Taking advantage of the umpolung
carbonyl-olefin coupling reactivity enabled by the archetypal single-electron
transfer (SET) reductant samarium diiodide (SmI2), the
lactone intermediate was submitted to two sequential SmI2-mediated cyclizations to stereoselectively construct the polycyclic
core of the natural product. Crucially, by exploiting the innate inner-sphere
nature of carbonyl reduction using SmI2, we have used a
steric blocking strategy to render sites SET-unreceptive and thus
achieve chemoselective reduction in a complex substrate. Our asymmetric
route enabled elucidation of the naturally occurring isomer of phaeocaulisin
A and provides a synthetic platform to access other guaiane-type sesquiterpenes
from C. phaeocaulis—as well
as their synthetic derivatives—for medicinal chemistry and
drug design.
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Affiliation(s)
- Áron Péter
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, UK
| | - Giacomo E M Crisenza
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, UK
| | - David J Procter
- Department of Chemistry, The University of Manchester, Oxford Road, Manchester M13 9PL, UK
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