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Derstine BC, Cook AJ, Collings JD, Gair J, Saurí J, Kwan EE, Burns NZ. Total Synthesis of (+)-Discorhabdin V. Angew Chem Int Ed Engl 2024; 63:e202315284. [PMID: 37956221 DOI: 10.1002/anie.202315284] [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: 10/10/2023] [Revised: 11/08/2023] [Accepted: 11/10/2023] [Indexed: 11/15/2023]
Abstract
The discorhabdin natural products are a large subset of pyrroloiminoquinone alkaloids with a myriad of biological activities. Despite garnering much synthetic attention, few members have thus far been completed, particularly those featuring a bridging carbon-nitrogen bond that is found in numerous discorhabdins, including discorhabdin V. Herein we report the first total synthesis and full stereochemical assignment of (+)-discorhabdin V. To access the pyrroloiminoquinone we developed a convergent N-alkylation/oxidative aminocyclization/bromination cascade that joins two key components, which are both made on multigram scale. An intramolecular Heck reaction then forms the quaternary carbon center in an intermediate containing the carbon-nitrogen bridge, and a reductive N,O-acetal cyclization sequence introduces the final piperidine ring. Furthermore, we have established the relative configuration of (+)-discorhabdin V through experimental NOESY data and DP4 NMR probability calculations. The absolute configuration of the natural product has also been determined by circular dichroism and the use of an amino acid derived chiral starting material. Our work represents one of only two reports of a total synthesis of a nitrogen-bridged discorhabdin and paves the way for future biological evaluation of such compounds.
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Affiliation(s)
| | - Alina J Cook
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA
| | - James D Collings
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA
| | | | - Josep Saurí
- Institut Químic de Sarrià (IQS), 08017, Barcelona, Catalonia, Spain
| | | | - Noah Z Burns
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA
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Shimomura M, Ide K, Sakata J, Tokuyama H. Unified Divergent Total Synthesis of Discorhabdin B, H, K, and Aleutianamine via the Late-Stage Oxidative N,S-Acetal Formation. J Am Chem Soc 2023; 145:18233-18239. [PMID: 37556762 DOI: 10.1021/jacs.3c06578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/11/2023]
Abstract
This study achieved the total syntheses of (+)-discorhabdin B, (-)-discorhabdin H, (+)-discorhabdin K, and (-)-aleutianamine. A phenethylamine fragment bearing a o-pivaloylthio group, corresponding to the D/E/G ring moiety, was prepared from benzothiophen-2-carboxylic acid methyl ester and condensed with a known pyrroloiminoquinone derivative. The adduct was subjected to [bis(trifluoroacetoxy)iodo]benzene (PIFA)-promoted oxidative spirocyclization to furnish the A/B/C/D/E spirocyclohexadienone fused with pyrroloiminoquinone. The total synthesis of (±)-discorhabdin B was completed via the key construction of the highly strained G ring with the N,S-acetal moiety featuring a newly developed CuBr2-mediated oxidative cascade cyclization. The stereocontrolled total synthesis of (+)-discorhabdin B was accomplished by a diastereoselective PIFA-promoted oxidative spirocyclization using a chiral thioester. (-)-Disocrhabdin H and (+)-discorhabdin K were synthesized by the site- and face-selective thia-Michael addition of l-ovothiol A to (+)-N-Ts-discorhabdin B with the concomitant formation of the F ring by forming the C2-N18 bond. The total synthesis of (-)-aleutianamine was achieved via a skeletal rearrangement initiated by the Luche reduction of the dienone moiety of (+)-N-Ts-discorhabdin B.
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Affiliation(s)
- Masashi Shimomura
- Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba 6-3, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Kohta Ide
- Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba 6-3, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Juri Sakata
- Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba 6-3, Aramaki, Aoba-ku, Sendai 980-8578, Japan
| | - Hidetoshi Tokuyama
- Graduate School of Pharmaceutical Sciences, Tohoku University, Aoba 6-3, Aramaki, Aoba-ku, Sendai 980-8578, Japan
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Noro T, Sakata J, Tokuyama H. Synthetic studies on discorhabdin V: Construction of the A–F hexacyclic framework. Tetrahedron Lett 2021. [DOI: 10.1016/j.tetlet.2021.153333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Smith MW, Falk ID, Ikemoto H, Burns NZ. A Convenient C-H Functionalization Platform for Pyrroloiminoquinone Alkaloid Synthesis. Tetrahedron 2019; 75:3366-3370. [PMID: 31889735 DOI: 10.1016/j.tet.2019.05.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Pyrroloiminoquinone alkaloids represent a structurally intriguing class of natural products that display an array of useful biological properties. Here, we present a versatile and scalable platform for the synthesis of this diverse family - and in particular the antitumor discorhabdins - built upon sequential selective C-H functionalization of tryptamine. The utility of this strategy is showcased through short formal syntheses of damirones A-C, makaluvamines D and I, and discorhadbin E. Additionally, we describe efforts to develop the first catalytic asymmetric entry to the discorhabdin subclass.
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Affiliation(s)
- Myles W Smith
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Isaac D Falk
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Hideya Ikemoto
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Noah Z Burns
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
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Abstract
Recent reports on the synthetic studies of marine pyrroloiminoquinone alakloids and their analogs are reviewed.
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Affiliation(s)
- Yasuyuki Kita
- College of Pharmaceutical Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga 525-8577, Japan.
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Hu JF, Fan H, Xiong J, Wu SB. Discorhabdins and Pyrroloiminoquinone-Related Alkaloids. Chem Rev 2011; 111:5465-91. [DOI: 10.1021/cr100435g] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jin-Feng Hu
- Department of Natural Products Chemistry, School of Pharmacy, Fudan University, No. 826 Zhangheng Road, Shanghai 201203, China
| | - Hui Fan
- Department of Natural Products for Chemical Genetic Research, Key Laboratory of Brain Functional Genomics, Ministry of Education, East China Normal University, No. 3663 Zhongshan Road N, Shanghai 200062, China
| | - Juan Xiong
- Department of Natural Products Chemistry, School of Pharmacy, Fudan University, No. 826 Zhangheng Road, Shanghai 201203, China
| | - Shi-Biao Wu
- Department of Natural Products for Chemical Genetic Research, Key Laboratory of Brain Functional Genomics, Ministry of Education, East China Normal University, No. 3663 Zhongshan Road N, Shanghai 200062, China
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Wada Y, Harayama Y, Kamimura D, Yoshida M, Shibata T, Fujiwara K, Morimoto K, Fujioka H, Kita Y. The synthetic and biological studies of discorhabdins and related compounds. Org Biomol Chem 2011; 9:4959-76. [DOI: 10.1039/c1ob05058c] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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Wada Y, Otani K, Endo N, Harayama Y, Kamimura D, Yoshida M, Fujioka H, Kita Y. The first total synthesis of prianosin B. Tetrahedron 2009. [DOI: 10.1016/j.tet.2008.11.051] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Passarella D, Belinghieri F, Scarpellini M, Pratesi G, Zunino F, Gia OM, Via LD, Santoro G, Danieli B. Synthesis and biological evaluation of pyrroloiminoquinone derivatives. Bioorg Med Chem 2008; 16:2431-8. [DOI: 10.1016/j.bmc.2007.11.063] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2007] [Revised: 11/14/2007] [Accepted: 11/21/2007] [Indexed: 10/22/2022]
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Shao H, Ding Q, Lown JW. STUDIES ON THE REACTIONS OF 2,3-DIKETOPYRIDO[4,3,2-de] QUINOLINES WITH AMINO ACIDS AND AMINO ESTERS. HETEROCYCL COMMUN 2000. [DOI: 10.1515/hc.2000.6.6.495] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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