1
|
Goda Y, Fuwa H. Total Synthesis of (-)-Enigmazole B. Org Lett 2023; 25:8402-8407. [PMID: 37796572 DOI: 10.1021/acs.orglett.3c03002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/06/2023]
Abstract
Total synthesis of (-)-enigmazole B was achieved for the first time. Highlights of the present synthesis include an olefin cross-metathesis and hemiacetalization/intramolecular oxa-Michael addition sequence for accessing an (E)-configured enol tosylate, a Sonogashira cross-coupling to assemble all the carbon atoms of the target natural product, a remarkably chemo- and regioselective Au-catalyzed intramolecular alkyne hydroalkoxylation for the construction of the dihydropyran ring, and a Yamaguchi macrolactonization to close the 18-membered macrolactone skeleton.
Collapse
Affiliation(s)
- Yoshihiro Goda
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan
| | - Haruhiko Fuwa
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan
| |
Collapse
|
2
|
Herlé B, Späth G, Schreyer L, Fürstner A. Total Synthesis of Mycinolide IV and Path‐Scouting for Aldgamycin N. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202016475] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Bart Herlé
- Max-Planck-Institut für Kohlenforschung 45470 Mülheim/Ruhr Germany
| | - Georg Späth
- Max-Planck-Institut für Kohlenforschung 45470 Mülheim/Ruhr Germany
| | - Lucas Schreyer
- Max-Planck-Institut für Kohlenforschung 45470 Mülheim/Ruhr Germany
| | - Alois Fürstner
- Max-Planck-Institut für Kohlenforschung 45470 Mülheim/Ruhr Germany
| |
Collapse
|
3
|
Herlé B, Späth G, Schreyer L, Fürstner A. Total Synthesis of Mycinolide IV and Path-Scouting for Aldgamycin N. Angew Chem Int Ed Engl 2021; 60:7893-7899. [PMID: 33448619 PMCID: PMC8048839 DOI: 10.1002/anie.202016475] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Revised: 01/13/2021] [Indexed: 12/19/2022]
Abstract
Proof-of-concept is provided that a large estate of 16-membered macrolide antibiotics can be reached by a "unified" approach. The key building block was formed on scale by an asymmetric vinylogous Mukaiyama aldol reaction; its alkene terminus was then converted either into the corresponding methyl ketone by Wacker oxidation or into a chain-extended aldehyde by catalyst-controlled branch-selective asymmetric hydroformylation. These transformations ultimately opened access to two structurally distinct series of macrolide targets. Notable late-stage maneuvers comprise a rare example of a ruthenium-catalyzed redox isomerization of an 1,3-enyne-5-ol into a 1,3-diene-5-one derivative, as well as the elaboration of a tertiary propargylic alcohol into an acyloin by trans-hydrostannation/Chan-Lam-type coupling. Moreover, this case study illustrates the underutilized possibility of forging complex macrolactone rings by transesterification under essentially neutral conditions.
Collapse
Affiliation(s)
- Bart Herlé
- Max-Planck-Institut für Kohlenforschung45470Mülheim/RuhrGermany
| | - Georg Späth
- Max-Planck-Institut für Kohlenforschung45470Mülheim/RuhrGermany
| | - Lucas Schreyer
- Max-Planck-Institut für Kohlenforschung45470Mülheim/RuhrGermany
| | - Alois Fürstner
- Max-Planck-Institut für Kohlenforschung45470Mülheim/RuhrGermany
| |
Collapse
|
4
|
Tracy JS, Kalnmals CA, Toste FD. Beyond Allylic Alkylation: Applications of Trost Chemistry in Complex Molecule Synthesis. Isr J Chem 2021. [DOI: 10.1002/ijch.202000103] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Jacob S. Tracy
- Dept. of Chemistry University of California, Berkeley MC 1460 Berkeley CA 94720 USA
| | | | - F. Dean Toste
- Dept. of Chemistry University of California, Berkeley MC 1460 Berkeley CA 94720 USA
| |
Collapse
|
5
|
Synthesis of the C1 – C16 fragment of bryostatin for incorporation into 20,20-fluorinated analogues. Tetrahedron 2021. [DOI: 10.1016/j.tet.2020.131743] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
6
|
Affiliation(s)
- Qiuming Liang
- Davenport Chemical Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada
| | - Kasumi Hayashi
- Davenport Chemical Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada
| | - Datong Song
- Davenport Chemical Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada
| |
Collapse
|
7
|
Zhang Y, Guo Q, Sun X, Lu J, Cao Y, Pu Q, Chu Z, Gao L, Song Z. Total Synthesis of Bryostatin 8 Using an Organosilane-Based Strategy. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201711452] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Yuebao Zhang
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, West China School of Pharmacy; Sichuan University; Chengdu 610041 China
| | - Qianyou Guo
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, West China School of Pharmacy; Sichuan University; Chengdu 610041 China
| | - Xianwei Sun
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, West China School of Pharmacy; Sichuan University; Chengdu 610041 China
| | - Ji Lu
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, West China School of Pharmacy; Sichuan University; Chengdu 610041 China
| | - Yanjun Cao
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, West China School of Pharmacy; Sichuan University; Chengdu 610041 China
| | - Qiang Pu
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, West China School of Pharmacy; Sichuan University; Chengdu 610041 China
| | - Zhiwen Chu
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, West China School of Pharmacy; Sichuan University; Chengdu 610041 China
| | - Lu Gao
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, West China School of Pharmacy; Sichuan University; Chengdu 610041 China
| | - Zhenlei Song
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, West China School of Pharmacy; Sichuan University; Chengdu 610041 China
- State Key Laboratory of Elemento-organic Chemistry; Nankai University; Tianjin 300071 China
| |
Collapse
|
8
|
Zhang Y, Guo Q, Sun X, Lu J, Cao Y, Pu Q, Chu Z, Gao L, Song Z. Total Synthesis of Bryostatin 8 Using an Organosilane-Based Strategy. Angew Chem Int Ed Engl 2017; 57:942-946. [PMID: 29210495 DOI: 10.1002/anie.201711452] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Indexed: 11/12/2022]
Affiliation(s)
- Yuebao Zhang
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, West China School of Pharmacy; Sichuan University; Chengdu 610041 China
| | - Qianyou Guo
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, West China School of Pharmacy; Sichuan University; Chengdu 610041 China
| | - Xianwei Sun
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, West China School of Pharmacy; Sichuan University; Chengdu 610041 China
| | - Ji Lu
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, West China School of Pharmacy; Sichuan University; Chengdu 610041 China
| | - Yanjun Cao
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, West China School of Pharmacy; Sichuan University; Chengdu 610041 China
| | - Qiang Pu
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, West China School of Pharmacy; Sichuan University; Chengdu 610041 China
| | - Zhiwen Chu
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, West China School of Pharmacy; Sichuan University; Chengdu 610041 China
| | - Lu Gao
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, West China School of Pharmacy; Sichuan University; Chengdu 610041 China
| | - Zhenlei Song
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, West China School of Pharmacy; Sichuan University; Chengdu 610041 China
- State Key Laboratory of Elemento-organic Chemistry; Nankai University; Tianjin 300071 China
| |
Collapse
|
9
|
Wender PA, Hardman CT, Ho S, Jeffreys MS, Maclaren JK, Quiroz RV, Ryckbosch SM, Shimizu AJ, Sloane JL, Stevens MC. Scalable synthesis of bryostatin 1 and analogs, adjuvant leads against latent HIV. Science 2017; 358:218-223. [PMID: 29026042 PMCID: PMC5714505 DOI: 10.1126/science.aan7969] [Citation(s) in RCA: 69] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2017] [Accepted: 08/04/2017] [Indexed: 11/02/2022]
Abstract
Bryostatin 1 is an exceedingly scarce marine-derived natural product that is in clinical development directed at HIV/AIDS eradication, cancer immunotherapy, and the treatment of Alzheimer's disease. Despite this unique portfolio of indications, its availability has been limited and variable, thus impeding research and clinical studies. Here, we report a total synthesis of bryostatin 1 that proceeds in 29 total steps (19 in the longest linear sequence, >80% average yield per step), collectively produces grams of material, and can be scaled to meet clinical needs (~20 grams per year). This practical solution to the bryostatin supply problem also opens broad, facile, and efficient access to derivatives and potentially superior analogs.
Collapse
Affiliation(s)
- Paul A Wender
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA.
- Department of Chemical and Systems Biology, Stanford University, Stanford, CA 94305, USA
| | - Clayton T Hardman
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA
| | - Stephen Ho
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA
| | | | - Jana K Maclaren
- Stanford Nano Shared Facilities, Stanford University, Stanford, CA 94305, USA
| | - Ryan V Quiroz
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA
| | | | - Akira J Shimizu
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA
| | - Jack L Sloane
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA
| | - Matthew C Stevens
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA
| |
Collapse
|
10
|
Lu J, Zhang Y, Yang W, Guo Q, Gao L, Song Z. Transformation of the B Ring to the C Ring of Bryostatins by Csp 3-H Amination and Z to E Isomerization. Org Lett 2017; 19:5232-5235. [PMID: 28901773 DOI: 10.1021/acs.orglett.7b02510] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An interesting approach to transform the B ring of bryostatins to the C ring has been developed. The key tactics of the approach feature an intramolecular Csp3-H bond amination to form spirocyclic hemiaminal, which undergoes ring opening to afford the C ring found in bryostatin 17. The subsequent epoxidation/oxidation sequence results in Z to E isomerization of the exo-cyclic enoate, delivering the common precursor, which could be transformed into the C ring found in bryostatins 1, 2, 4-9, 12, 14, and 15.
Collapse
Affiliation(s)
- Ji Lu
- Key Laboratory of Drug-Targeting of Education Ministry and Department of Medicinal Chemistry, West China School of Pharmacy, Sichuan University , Chengdu 610064, P. R. China
| | - Yuebao Zhang
- Key Laboratory of Drug-Targeting of Education Ministry and Department of Medicinal Chemistry, West China School of Pharmacy, Sichuan University , Chengdu 610064, P. R. China
| | - WenYu Yang
- Key Laboratory of Drug-Targeting of Education Ministry and Department of Medicinal Chemistry, West China School of Pharmacy, Sichuan University , Chengdu 610064, P. R. China
| | - Qianyou Guo
- Key Laboratory of Drug-Targeting of Education Ministry and Department of Medicinal Chemistry, West China School of Pharmacy, Sichuan University , Chengdu 610064, P. R. China
| | - Lu Gao
- Key Laboratory of Drug-Targeting of Education Ministry and Department of Medicinal Chemistry, West China School of Pharmacy, Sichuan University , Chengdu 610064, P. R. China
| | - Zhenlei Song
- Key Laboratory of Drug-Targeting of Education Ministry and Department of Medicinal Chemistry, West China School of Pharmacy, Sichuan University , Chengdu 610064, P. R. China.,State Key Laboratory of Elemento-organic Chemistry, Nankai University , Tianjin 300071, P. R. China
| |
Collapse
|
11
|
Concise and efficient synthesis of E-stereoisomers of exo-cyclic carbohydrate enones. Aldol condensation of dihydrolevoglucosenone with five-membered aromatic aldehydes Part 1. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.09.028] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
12
|
Ketcham JM, Volchkov I, Chen TY, Blumberg PM, Kedei N, Lewin NE, Krische MJ. Evaluation of Chromane-Based Bryostatin Analogues Prepared via Hydrogen-Mediated C-C Bond Formation: Potency Does Not Confer Bryostatin-like Biology. J Am Chem Soc 2016; 138:13415-13423. [PMID: 27676096 PMCID: PMC5094189 DOI: 10.1021/jacs.6b08695] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The synthesis and biological evaluation of chromane-containing bryostatin analogues WN-2-WN-7 and the previously reported salicylate-based analogue WN-8 are described. Analogues WN-2-WN-7 are prepared through convergent assembly of the chromane-containing fragment B-I with the "binding domain" fragment A-I or its C26-des-methyl congener, fragment A-II. The synthesis of fragment B-I features enantioselective double C-H allylation of 1,3-propanediol to form the C2-symmetric diol 3 and Heck cyclization of bromo-diene 5 to form the chromane core. The synthesis of salicylate WN-8 is accomplished through the union of fragments A-III and B-II. The highest binding affinities for PKCα are observed for the C26-des-methyl analogues WN-3 (Ki = 63.9 nM) and WN-7 (Ki = 63.1 nM). All analogues, WN-2-WN-8, inhibited growth of Toledo cells, with the most potent analogue being WN-7. This response, however, does not distinguish between phorbol ester-like and bryostatin-like behavior. In contrast, while many of the analogues contain a conserved C-ring in the binding domain and other features common to analogues with bryostatin-like properties, all analogues evaluated in the U937 proliferation and cell attachment assays displayed phorbol ester-like and/or toxic behavior, including WN-8, for which "bryostatin-like PKC modulatory activities" previously was suggested solely on the basis of PKC binding. These results underscore the importance of considering downstream biological effects, as tumor suppression cannot be inferred from potent PKC binding.
Collapse
Affiliation(s)
- John M. Ketcham
- University of Texas at Austin, Department of Chemistry and Biochemistry, Austin, TX 78712, USA
| | - Ivan Volchkov
- University of Texas at Austin, Department of Chemistry and Biochemistry, Austin, TX 78712, USA
| | - Te-Yu Chen
- University of Texas at Austin, Department of Chemistry and Biochemistry, Austin, TX 78712, USA
| | - Peter M. Blumberg
- Laboratory of Cancer Biology and Genetics, NCI, National Institutes of Health, Bethesda, MD 20892-4255, USA
| | - Noemi Kedei
- Laboratory of Cancer Biology and Genetics, NCI, National Institutes of Health, Bethesda, MD 20892-4255, USA
| | - Nancy E. Lewin
- Laboratory of Cancer Biology and Genetics, NCI, National Institutes of Health, Bethesda, MD 20892-4255, USA
| | - Michael J. Krische
- University of Texas at Austin, Department of Chemistry and Biochemistry, Austin, TX 78712, USA
| |
Collapse
|
13
|
Petersen ME, Kedei N, Lewin NE, Blumberg PM, Keck GE. Replacement of the Bryostatin A- and B-Pyran Rings With Phenyl Rings Leads to Loss of High Affinity Binding With PKC. Tetrahedron Lett 2016; 57:4749-4753. [PMID: 27713589 DOI: 10.1016/j.tetlet.2016.09.040] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
We describe a convergent synthesis of a bryostatin analogue in which the natural A- and B-ring pyrans have been replaced by phenyl rings. The new analogue exhibited PMA like behavior in cell assays, but failed to maintain high affinity binding for PKC, despite retaining an unaltered C-ring 'binding domain'.
Collapse
Affiliation(s)
- Mark E Petersen
- University of Utah, Department of Chemistry, Salt Lake City, UT, 84112, USA
| | - Noemi Kedei
- Laboratory of Cancer Biology and Genetics, NCI, National Institutes of Health, Bethesda, MD 20892-4255, USA
| | - Nancy E Lewin
- Laboratory of Cancer Biology and Genetics, NCI, National Institutes of Health, Bethesda, MD 20892-4255, USA
| | - Peter M Blumberg
- Laboratory of Cancer Biology and Genetics, NCI, National Institutes of Health, Bethesda, MD 20892-4255, USA
| | - Gary E Keck
- University of Utah, Department of Chemistry, Salt Lake City, UT, 84112, USA
| |
Collapse
|
14
|
Long S, Sousa E, Kijjoa A, Pinto MMM. Marine Natural Products as Models to Circumvent Multidrug Resistance. Molecules 2016; 21:molecules21070892. [PMID: 27399665 PMCID: PMC6273648 DOI: 10.3390/molecules21070892] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Revised: 06/27/2016] [Accepted: 07/01/2016] [Indexed: 02/01/2023] Open
Abstract
Multidrug resistance (MDR) to anticancer drugs is a serious health problem that in many cases leads to cancer treatment failure. The ATP binding cassette (ABC) transporter P-glycoprotein (P-gp), which leads to premature efflux of drugs from cancer cells, is often responsible for MDR. On the other hand, a strategy to search for modulators from natural products to overcome MDR had been in place during the last decades. However, Nature limits the amount of some natural products, which has led to the development of synthetic strategies to increase their availability. This review summarizes the research findings on marine natural products and derivatives, mainly alkaloids, polyoxygenated sterols, polyketides, terpenoids, diketopiperazines, and peptides, with P-gp inhibitory activity highlighting the established structure-activity relationships. The synthetic pathways for the total synthesis of the most promising members and analogs are also presented. It is expected that the data gathered during the last decades concerning their synthesis and MDR-inhibiting activities will help medicinal chemists develop potential drug candidates using marine natural products as models which can deliver new ABC transporter inhibitor scaffolds.
Collapse
Affiliation(s)
- Solida Long
- Laboratório de Química Orgânica e Farmacêutica, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, Porto 4050-313, Portugal.
| | - Emília Sousa
- Laboratório de Química Orgânica e Farmacêutica, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, Porto 4050-313, Portugal.
- Interdisciplinary Centre of Marine and Environmental Research (CIIMAR), Porto 4050-123, Portugal.
| | - Anake Kijjoa
- Interdisciplinary Centre of Marine and Environmental Research (CIIMAR), Porto 4050-123, Portugal.
- Instituto de Ciências Biomédicas Abel Salazar (ICBAS), Universidade do Porto, Porto 4050-123, Portugal.
| | - Madalena M M Pinto
- Laboratório de Química Orgânica e Farmacêutica, Departamento de Ciências Químicas, Faculdade de Farmácia, Universidade do Porto, Porto 4050-313, Portugal.
- Interdisciplinary Centre of Marine and Environmental Research (CIIMAR), Porto 4050-123, Portugal.
| |
Collapse
|
15
|
Trost BM, Masters JT. Transition metal-catalyzed couplings of alkynes to 1,3-enynes: modern methods and synthetic applications. Chem Soc Rev 2016; 45:2212-38. [PMID: 27086769 PMCID: PMC4837660 DOI: 10.1039/c5cs00892a] [Citation(s) in RCA: 202] [Impact Index Per Article: 25.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The metal-catalyzed coupling of alkynes is a powerful method for the preparation of 1,3-enynes, compounds that are of broad interest in organic synthesis. Numerous strategies have been developed for the homo- and cross coupling of alkynes to enynes via transition metal catalysis. In such reactions, a major issue is the control of regio-, stereo-, and, where applicable, chemoselectivity. Herein, we highlight prominent methods for the selective synthesis of these valuable compounds. Further, we illustrate the utility of these processes through specific examples of their application in carbocycle, heterocycle, and natural product syntheses.
Collapse
Affiliation(s)
- Barry M Trost
- Department of Chemistry, Stanford University, Stanford, CA 94305-5080, USA.
| | | |
Collapse
|
16
|
Chiral Bimetallic Lewis Acids. TOP ORGANOMETAL CHEM 2015. [DOI: 10.1007/3418_2015_153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
17
|
Andrews IP, Ketcham JM, Blumberg PM, Kedei N, Lewin N, Peach ML, Krische MJ. Synthesis of seco-B-ring bryostatin analogue WN-1 via C-C bond-forming hydrogenation: critical contribution of the B-ring in determining bryostatin-like and phorbol 12-myristate 13-acetate-like properties. J Am Chem Soc 2014; 136:13209-16. [PMID: 25207655 PMCID: PMC4183601 DOI: 10.1021/ja507825s] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2014] [Indexed: 01/31/2023]
Abstract
The seco-B-ring bryostatin analogue, macrodiolide WN-1, was prepared in 17 steps (longest linear sequence) and 30 total steps with three bonds formed via hydrogen-mediated C-C coupling. This synthetic route features a palladium-catalyzed alkoxycarbonylation of a C2-symmetric diol to form the C9-deoxygenated bryostatin A-ring. WN-1 binds to PKCα (Ki = 16.1 nM) and inhibits the growth of multiple leukemia cell lines. Although structural features of the WN-1 A-ring and C-ring are shared by analogues that display bryostatin-like behavior, WN-1 displays PMA-like behavior in U937 cell attachment and proliferation assays, as well as in K562 and MV-4-11 proliferation assays. Molecular modeling studies suggest the pattern of internal hydrogen bonds evident in bryostatin 1 is preserved in WN-1, and that upon docking WN-1 into the crystal structure of the C1b domain of PKCδ, the binding mode of bryostatin 1 is reproduced. The collective data emphasize the critical contribution of the B-ring to the function of the upper portion of the molecule in conferring a bryostatin-like pattern of biological activity.
Collapse
Affiliation(s)
- Ian P. Andrews
- Department
of Chemistry and Biochemistry, University
of Texas at Austin, Austin, Texas 78712, United States
| | - John M. Ketcham
- Department
of Chemistry and Biochemistry, University
of Texas at Austin, Austin, Texas 78712, United States
| | - Peter M. Blumberg
- Laboratory
of Cancer Biology and Genetics, National
Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892-4255, United States
| | - Noemi Kedei
- Laboratory
of Cancer Biology and Genetics, National
Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892-4255, United States
| | - Nancy
E. Lewin
- Laboratory
of Cancer Biology and Genetics, National
Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892-4255, United States
| | - Megan L. Peach
- Basic Science Program,
Leidos Biomedical Research, Inc., Chemical Biology Laboratory, Frederick National Laboratory for Cancer Research, Frederick, Maryland 21702, United States
| | - Michael J. Krische
- Department
of Chemistry and Biochemistry, University
of Texas at Austin, Austin, Texas 78712, United States
| |
Collapse
|
18
|
Gao L, Lu J, Song Z. Recent efforts to construct the B-ring of bryostatins. Chem Commun (Camb) 2014; 49:10211-20. [PMID: 24051556 DOI: 10.1039/c3cc45947k] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Among macrocyclic natural products, bryostatins have excellent bioactivities and unique structures that make them highly attractive to synthetic chemists. Particularly challenging for the total synthesis of bryostatins is the B-ring, which features a cis-tetrahydropyran containing a geometrically defined exocyclic Z-methyl enoate. Synthetic chemists have recently displayed great prowess in their efforts to construct this ring, and here we summarize the progress towards this goal.
Collapse
Affiliation(s)
- Lu Gao
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Department of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu, 610041, China.
| | | | | |
Collapse
|
19
|
Kollár P, Rajchard J, Balounová Z, Pazourek J. Marine natural products: bryostatins in preclinical and clinical studies. PHARMACEUTICAL BIOLOGY 2014; 52:237-242. [PMID: 24033119 DOI: 10.3109/13880209.2013.804100] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
CONTEXT Bryostatins represent an important group of pharmaceutically promising substances. These compounds are produced by commensal microorganisms naturally occurring in marine invertebrates, mainly in bryozoans. The most frequently investigated substance is bryostatin-1, which is a highly oxygenated macrolide with a polyacetate backbone. OBJECTIVE The aim of this work was to summarize documented preclinical and clinical effects of bryostatin-class compounds. METHODS A literature search was made of Medline and Web of Science databases in 2012. RESULTS AND CONCLUSION Our review showed that bryostatins are potent agonists of protein kinase C. In addition to this, their significant antineoplastic activity against several tumor types has also been established and described. Bryostatin's anticancer activity has been proved against various cancer types. Moreover, significant results have been achieved by using bryostatin-1 in combination with other therapies, including combination with vaccine testing. Concerning other important properties that bryostatins possess, their ability to sensitize some resistant cells to chemotherapy agents, or immunoactivity and further stimulating growth of new neural connections, and enhancing effect on long-term memory are worth mentioning. In particular, some new bryostatin analogs could represent potential therapeutic agent for the treatment of cancer and other diseases in future.
Collapse
Affiliation(s)
- Peter Kollár
- Department of Human Pharmacology and Toxicology, Faculty of Pharmacy, University of Veterinary and Pharmaceutical Sciences Brno , Brno , Czech Republic
| | | | | | | |
Collapse
|
20
|
Herndon JW. The chemistry of the carbon-transition metal double and triple bond: Annual survey covering the year 2011. Coord Chem Rev 2013. [DOI: 10.1016/j.ccr.2013.05.011] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
|
21
|
Trost BM, Yang H, Brindle CS, Dong G. Atom-economic and stereoselective syntheses of the ring a and B subunits of the bryostatins. Chemistry 2011; 17:9777-88. [PMID: 21774000 DOI: 10.1002/chem.201002930] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2010] [Revised: 04/21/2011] [Indexed: 11/06/2022]
Abstract
This article describes chemoselective and atom-economic methods for the stereoselective assembly of the ring A and B subunits of bryostatins. A Ru-catalyzed tandem alkene-alkyne coupling/Michael addition reaction was developed and applied to the synthesis of bryostatin ring B. We explored an acetylide-mediated epoxide-opening/6-exo-dig cyclization route to access the bryostatin ring A, although ring A was eventually furnished through an acid-catalyzed tandem transketalization/ketalization sequence. In addition, a dinuclear zinc-catalyzed methyl vinyl ketone (MVK) aldol strategy was evaluated for the construction of the polyacetate moiety. Utilization of these methods ultimately led to the rapid assembly of the northern bryostatin fragment containing both the ring A and B subunits.
Collapse
Affiliation(s)
- Barry M Trost
- Department of Chemistry, Stanford University, Stanford, California 94305-5080, USA.
| | | | | | | |
Collapse
|