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Takahashi S. Studies on Streptomyces sp. SN-593: reveromycin biosynthesis, β-carboline biomediator activating LuxR family regulator, and construction of terpenoid biosynthetic platform. J Antibiot (Tokyo) 2022; 75:432-444. [PMID: 35778609 DOI: 10.1038/s41429-022-00539-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2022] [Revised: 06/08/2022] [Accepted: 06/09/2022] [Indexed: 11/09/2022]
Abstract
Streptomyces represents an important reservoir for biologically active natural products. Understanding the biosynthetic mechanism and the mode of gene expression is important for enhanced metabolite production and evaluation of biological activities. This review provides an overview of biosynthetic studies investigating reveromycin and β-carboline biomediators that enhanced the production of reveromycin in Streptomyces sp. SN-593 through activation of the LuxR family regulator. Furthermore, based on the optimal expression of a pathway specific regulator controlling the mevalonate pathway gene cluster, Streptomyces sp. SN-593 was developed as a platform for terpenoid compounds mass production.
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Affiliation(s)
- Shunji Takahashi
- Natural Product Biosynthesis Research Unit, RIKEN Centre for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan.
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2
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Woydziak ZR, Yucel AJ, Chamberlin AR. Tautomycetin Synthetic Analogues: Selective Inhibitors of Protein Phosphatase I. ChemMedChem 2021; 16:839-850. [PMID: 33301228 PMCID: PMC8582298 DOI: 10.1002/cmdc.202000801] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Indexed: 01/21/2023]
Abstract
Ser/Thr protein phosphatases (PPs) regulate a substantial range of cellular processes with protein phosphatases 1 (PP1) and 2 A (PP2A) accounting for over 90 % of the activity within cells. Nevertheless, tools to study PPs are limited as PPs inhibitors, particularly those selective for PP1 inhibition, are relatively scarce. Two examples of PP1-selective inhibitors, which share structural similarities, are tautomycin (TTM) and tautomycetin (TTN). This work describes the development of PP1/PP2A inhibitors that incorporate key structural features of TTM and TTN and are designed to conserve regions known to bind the active site of PP1/PP2A but vary regions that differentially contact the hydrophobic groove of PP1/PP2A. In all 28 TTN analogues were synthetically generated that inhibit PP1/PP2A activity at <250 mM; seven possessed inhibition activity at 100 nM. The IC50 values were determined for the seven most active analogues, which ranged from 34 to 1500 nM (PP1) and 70 to 6800 nM (PP2A). Four of the seven analogues possessed PP1 selectivity, and one demonstrated eightfold selectivity in the nanomolar range (PP1 IC50 =34 nM, PP2A IC50 =270 nM). A rationale is given for the observed differences in selectivity.
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Affiliation(s)
- Zachary R Woydziak
- Department of Physical and Life Sciences, Nevada State College, 1300, Nevada State Dr., Henderson, NV 89002, USA
| | - A John Yucel
- Department of Pharmaceutical Sciences, University of California, Irvine, 147 Biol. Sci. Admin., Irvine, CA 92697, USA
| | - A Richard Chamberlin
- Department of Pharmaceutical Sciences, University of California, Irvine, 147 Biol. Sci. Admin., Irvine, CA 92697, USA
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Pereira de Sant'Ana D, de Oliveira Rezende Júnior C, Campagne JM, Dias LC, Marcia de Figueiredo R. Synthetic Studies toward the Total Synthesis of Tautomycetin. J Org Chem 2019; 84:12344-12357. [PMID: 31480837 DOI: 10.1021/acs.joc.9b01712] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The studies culminating in the synthesis of two large subunits of tautomycetin are described. The first one, fragment C1-C12 that has an anti-1,3-dimethyl system and a terminal diene unit, was accomplished in 10 linear steps in 7.4% overall yield. The second one, fragment C13-C25 which bears the sensitive anhydride framework and the majority of the stereogenic centers, was prepared in 13 linear steps (longest sequence) in 8% overall yield. Among the key transformations used, a regioselective epoxide opening, a Pd-catalyzed addition of terminal alkyne to acceptor alkyne, a Mukaiyama aldol reaction, a Yamaguchi esterification, and a homemade mild di-esterification can be cited. The chosen strategies allowed good yields, stereoselectivity, reproducibility, and scalability for several important intermediates.
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Affiliation(s)
- Danilo Pereira de Sant'Ana
- Institute of Chemistry , University of Campinas , Campinas/São Paulo 13083-970 , Brazil.,Institut Charles Gerhardt, UMR 5253, Université de Montpellier, CNRS, ENSCM , 240 Avenue du Professeur Emile Jeanbrau , Montpellier Cedex 5 34296 , France
| | | | - Jean-Marc Campagne
- Institut Charles Gerhardt, UMR 5253, Université de Montpellier, CNRS, ENSCM , 240 Avenue du Professeur Emile Jeanbrau , Montpellier Cedex 5 34296 , France
| | - Luiz Carlos Dias
- Institute of Chemistry , University of Campinas , Campinas/São Paulo 13083-970 , Brazil
| | - Renata Marcia de Figueiredo
- Institut Charles Gerhardt, UMR 5253, Université de Montpellier, CNRS, ENSCM , 240 Avenue du Professeur Emile Jeanbrau , Montpellier Cedex 5 34296 , France
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4
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Simon G, Eljezi T, Legeret B, Charmantray F, Castillo JA, Guérard-Hélaine C, Lemaire M, Bouzon M, Marlière P, Hélaine V, Hecquet L. Synthesis of Specially Designed Probes to Broaden Transketolase Scope. ChemCatChem 2013. [DOI: 10.1002/cctc.201200479] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Kato N, Takahashi S, Nogawa T, Saito T, Osada H. Construction of a microbial natural product library for chemical biology studies. Curr Opin Chem Biol 2012; 16:101-8. [DOI: 10.1016/j.cbpa.2012.02.016] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2012] [Revised: 02/12/2012] [Accepted: 02/13/2012] [Indexed: 10/28/2022]
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Reveromycin A biosynthesis uses RevG and RevJ for stereospecific spiroacetal formation. Nat Chem Biol 2011; 7:461-8. [PMID: 21642985 DOI: 10.1038/nchembio.583] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2011] [Accepted: 04/13/2011] [Indexed: 01/16/2023]
Abstract
Spiroacetal compounds are ubiquitous in nature, and their stereospecific structures are responsible for diverse pharmaceutical activities. Elucidation of the biosynthetic mechanisms that are involved in spiroacetal formation will open the door to efficient generation of stereospecific structures that are otherwise hard to synthesize chemically. However, the biosynthesis of these compounds is poorly understood, owing to difficulties in identifying the responsible enzymes and analyzing unstable intermediates. Here we comprehensively describe the spiroacetal formation involved in the biosynthesis of reveromycin A, which inhibits bone resorption and bone metastases of tumor cells by inducing apoptosis in osteoclasts. We performed gene disruption, systematic metabolite analysis, feeding of labeled precursors and conversion studies with recombinant enzymes. We identified two key enzymes, dihydroxy ketone synthase and spiroacetal synthase, and showed in vitro reconstruction of the stereospecific spiroacetal structure from a stable acyclic precursor. Our findings provide insights into the creation of a variety of biologically active spiroacetal compounds for drug leads.
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Abstract
It has been a long journey since tautomycin (TTM) was isolated in 1987 and the discovery that it inhibited protein phosphatase 1 (PP1) more strongly than PP2A until finally the cocrystal structure of TTM and PP1 was presented early in 2009. The fact that TTM shows preference to inhibit PP1 over PP2A makes this compound unique among the known PP1 and PP2A inhibitors. A number of groups were involved in work aiming to unravel TTM's interactions with PP1 and by doing so hoping to disentangle the secrets as to why TTM is a better inhibitor of PP1 than PP2A. This Focus Review looks back at the work conducted with TTM in order to establish its point of interaction with PP1 prior to X-ray structure. Finally the conclusions before the X-ray structure are compared with the real situation.
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Affiliation(s)
- Magne O Sydnes
- Laboratory of Organic Chemistry, Graduate School of Bioagricultural Sciences, Nagoya University, Furo-cho, Chikusa, Nagoya 464-8601, Japan
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Chang-Qing W, Gang Z, Yu D. An unexpected synthesis of an α, β, γ, δ-unsaturated ketone due to an abnormal opening of benzylidene acetal by bromide anion. CHINESE J CHEM 2010. [DOI: 10.1002/cjoc.20000180215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Luo Y, Li W, Ju J, Yuan Q, Peters NR, Hoffmann FM, Huang SX, Bugni TS, Rajski S, Osada H, Shen B. Functional characterization of TtnD and TtnF, unveiling new insights into tautomycetin biosynthesis. J Am Chem Soc 2010; 132:6663-71. [PMID: 20426415 DOI: 10.1021/ja9082446] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The biosynthetic gene cluster for tautomycetin (TTN), a highly potent and selective protein phosphatase (PP) inhibitor isolated from Streptomyces griseochromogenes, has recently been cloned and sequenced. To better understand the transformations responsible for converting the post-polyketide synthase product into the exciting anticancer and immunosuppressive chemotherapeutic candidate TTN, we produced and characterized new analogues resulting from inactivation of two genes, ttnD and ttnF, in S. griseochromogenes. Inactivation of ttnD and ttnF, which encode for putative decarboxylase and dehydratase enzymes, respectively, afforded mutant strains SB13013 and SB13014. The DeltattnD mutant SB13013 accumulated four new TTN analogues, TTN D-1, TTN D-2, TTN D-3, and TTN D-4, whereas the DeltattnF mutant accumulated only one new TTN analogue, TTN F-1. The accumulation of these new TTN analogues defines the function of TtnD and TtnF and the timing of their chemistries in relation to installation of the C5 ketone moiety within TTN. Notably, all new analogues possess a structurally distinguishing carboxylic acid moiety, revealing that TtnD apparently cannot catalyze decarboxylation in the absence of TtnF. Additionally, cytotoxicity and PP inhibition assays reveal the importance of the functional groups installed by TtnDF and, consistent with earlier proposals, the C2''-C5 fragment of TTN to be a critical structural determinant behind the important and unique PP-1 selectivity displayed by TTN.
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Affiliation(s)
- Yinggang Luo
- Division of Pharmaceutical Sciences, University of Wisconsin, USA
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Li W, Luo Y, Ju J, Rajski SR, Osada H, Shen B. Characterization of the tautomycetin biosynthetic gene cluster from Streptomyces griseochromogenes provides new insight into dialkylmaleic anhydride biosynthesis. JOURNAL OF NATURAL PRODUCTS 2009; 72:450-459. [PMID: 19191560 PMCID: PMC2967020 DOI: 10.1021/np8007478] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Tautomycetin (TTN) is a highly potent and specific protein phosphatase inhibitor isolated from Streptomyces griseochromogenes. The biological activity of TTN makes it an important lead for drug discovery, whereas its rare dialkylmaleic anhydride moiety and structural similarity to tautomycin (TTM), another potent phosphatase inhibitor with tremendous medicinal potential, draws attention to novel biosynthetic chemistries responsible for its production. To elucidate the biosynthetic machinery associated with TTN production, the ttn biosynthetic gene cluster from S. griseochromogenes was isolated and characterized, and its involvement in TTN biosynthesis confirmed by gene inactivation and complementation experiments. The ttn cluster was localized to a 79 kb DNA region, consisting of 19 open reading frames that encode two modular type I polyketide synthases (TtnAB), one type II thioesterase (TtnH), eight proteins for dialkylmaleic anhydride biosynthesis (TtnKLMNOPRS), four tailoring enzymes (TtnCDFI), two regulatory proteins (TtnGQ), and one resistance protein (TtnJ). A model for TTN biosynthesis is proposed on the basis of functional assignments from sequence analysis, which agrees well with previous feeding experiments, has been supported by in vivo gene inactivation experiments, and is supported by analogy to the recently reported ttm cluster. These findings set the stage to fully investigate TTN biosynthesis and to biosynthetically engineer new TTN analogues.
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Affiliation(s)
| | | | | | | | | | - Ben Shen
- To whom correspondence should be addressed. Tel: (608) 263-2673. Fax: (608) 262-5345.
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Li W, Ju J, Rajski SR, Osada H, Shen B. Characterization of the tautomycin biosynthetic gene cluster from Streptomyces spiroverticillatus unveiling new insights into dialkylmaleic anhydride and polyketide biosynthesis. J Biol Chem 2008; 283:28607-17. [PMID: 18708355 DOI: 10.1074/jbc.m804279200] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Tautomycin (TTM) is a highly potent and specific protein phosphatase inhibitor isolated from Streptomyces spiroverticillatus. The biological activity of TTM makes it an important lead for drug discovery, whereas its spiroketal-containing polyketide chain and rare dialkylmaleic anhydride moiety draw attention to novel biosynthetic chemistries responsible for its production. To elucidate the biosynthetic machinery associated with these novel molecular features, the ttm biosynthetic gene cluster from S. spiroverticillatus was isolated and characterized, and its involvement in TTM biosynthesis was confirmed by gene inactivation and complementation experiments. The ttm cluster was localized to a 86-kb DNA region, consisting of 20 open reading frames that encode three modular type I polyketide synthases (TtmHIJ), one type II thioesterase (TtmT), five proteins for methoxymalonyl-S-acyl carrier protein biosynthesis (Ttm-ABCDE), eight proteins for dialkylmaleic anhydride biosynthesis and regulation (TtmKLMNOPRS), as well as two additional regulatory proteins (TtmF and TtmQ) and one tailoring enzyme (TtmG). A model for TTM biosynthesis is proposed based on functional assignments from sequence analysis, which agrees well with previous feeding experiments, and has been further supported by in vivo gene inactivation experiments. These findings set the stage to fully investigate TTM biosynthesis and to biosynthetically engineer new TTM analogs.
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Affiliation(s)
- Wenli Li
- Division of Pharmaceutical Sciences, University of Wisconsin-Madison, Madison, Wisconsin 53705, USA
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Haval KP, Argade NP. General strategy for the synthesis of natural and unnatural dialkylmaleic anhydrides. J Org Chem 2008; 73:6936-8. [PMID: 18665645 DOI: 10.1021/jo801284r] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Starting from alkylidenesuccinimides, a wide range of dialkylmaleic anhydrides have been synthesized via the generation of a carbanion on a succinimide unit and its condensation with various alkyl halides as the key reaction.
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Affiliation(s)
- Kishan P Haval
- Division of Organic Chemistry, National Chemical Laboratory, Pune 411 008, India
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13
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Chen X, Zheng Y, Shen Y. Natural Products with Maleic Anhydride Structure: Nonadrides, Tautomycin, Chaetomellic Anhydride, and Other Compounds. Chem Rev 2007; 107:1777-830. [PMID: 17439289 DOI: 10.1021/cr050029r] [Citation(s) in RCA: 89] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xiaolong Chen
- Institute of Bioengineering, Zhejiang University of Technology, Hangzhou 310032, P. R. China
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Abstract
The aldol reaction is one of the most important methods for the stereoselective construction of polyketide natural products, not only for nature but also for synthetic chemistry. The tremendous development in the field of aldol additions during the last 30 years has led to more and more total syntheses of complicated natural products. This Review illustrates by means of selected syntheses of natural products the new variants of the aldol addition. This includes aldol additions with various metal enolates, as well as metal-complex-catalyzed, organocatalytic, and biocatalytic methods.
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Affiliation(s)
- Bernd Schetter
- Chemisches Institut, Humboldt-Universität zu Berlin, Brook-Taylor-Strasse 2, 12489 Berlin, Germany
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Boudreau MA, Vederas JC. Synthesis and biological evaluation of nucleoside dicarboxylates as potential mimics of nucleoside diphosphates. Org Biomol Chem 2007; 5:627-35. [PMID: 17285171 DOI: 10.1039/b615230a] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of nucleotide analogues wherein the diphosphate moiety has been replaced by a dicarboxylate were synthesized and tested for inhibitory activity against nucleoside diphosphate (NDP) kinase as well as several pathogenic bacterial strains.
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Affiliation(s)
- Marc A Boudreau
- Department of Chemistry, Gunning/Lemieux Chemistry Centre, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
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Haval KP, Argade NP. Haval–Argade contrathermodynamic rearrangement of alkylidenesuccinimides to alkylmaleimides via the corresponding isoimides: a general approach to alkyl and dialkyl substituted maleimides. Tetrahedron 2006. [DOI: 10.1016/j.tet.2006.01.091] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Ishii Y, Nagumo S, Arai T, Akuzawa M, Kawahara N, Akita H. Synthetic study of tautomycin. Part 2: Synthesis of Ichihara's fragment based on regioselective enzymatic acetylation of complex molecule. Tetrahedron 2006. [DOI: 10.1016/j.tet.2005.10.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Paquette LA, Chang J, Liu Z. Synthetic Studies Aimed at (−)-Cochleamycin A. Evaluation of Late-Stage Macrocyclization Alternatives. J Org Chem 2004; 69:6441-8. [PMID: 15357606 DOI: 10.1021/jo049084a] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An efficient route to the fully functionalized ABC ring systems of the unnatural enantiomer of cochleamycin A was developed. L-(-)-Malic and L-(-)-ascorbic acids served well as starting materials for the two building blocks used to construct an (E,Z,E)-1,6,8-nonatriene intermediate. The AB part structure was assembled by way of a stereocontrolled intramolecular Diels-Alder cycloaddition via adoption of an endo transition state. From this vantage point, two general pathways were subsequently explored as to their suitability for elaboration of the CD rings. Initially examined was a protocol involving 10-membered carbocycle construction. When this approach was demonstrated not to be workable, attention was directed to 10-membered macrolactonization as an alternative tactic. Although assembly of the C-ring in this manner was easily achieved, ultimate closure of the six-membered ring to form ring D remains an unsolved problem.
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Affiliation(s)
- Leo A Paquette
- Evans Chemical Laboratories, The Ohio State University, Columbus, Ohio 43210, USA.
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Kurono M, Isobe M. A practical semi-synthesis of tautomycin using a hydrolysate of natural tautomycin. Tetrahedron 2003. [DOI: 10.1016/j.tet.2003.09.097] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Liu W, Sheppeck JE, Colby DA, Huang HB, Nairn AC, Chamberlin AR. The selective inhibition of phosphatases by natural toxins: the anhydride domain of tautomycin is not a primary factor in controlling PP1/PP2A selectivity. Bioorg Med Chem Lett 2003; 13:1597-600. [PMID: 12699763 DOI: 10.1016/s0960-894x(03)00105-7] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Analogues of the potent and moderately selective PP1/PP2A inhibitor tautomycin (TM) were prepared with modifications in the C1'-C7' anhydride moiety. While all retain varying degrees of activity within a 3000-fold range of potencies, they also show remarkable constancy in their IC(50) ratios, suggesting that the anhydride moiety is not critical in controlling the selectivity of inhibition.
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Affiliation(s)
- Wen Liu
- Department of Chemistry, University of California at Irvine, Irvine, CA 92697, USA
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Colby DA, Liu W, Sheppeck JE, Huang HB, Nairn AC, Chamberlin AR. A new model of the tautomycin-PP1 complex that is not analogous to the corresponding okadaic acid structure. Bioorg Med Chem Lett 2003; 13:1601-5. [PMID: 12699764 DOI: 10.1016/s0960-894x(03)00106-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A revised model of PP1-tautomycin (TM) complex suggests that this toxin does not bind in a conformation analogous to its structural cousin okadaic acid (OA), as has been assumed, but instead more resembles the mode of binding adopted by calyculin. This model rationalizes the unexpected potency of a truncated TM analogue lacking the bicyclic ketal common to TM and OA.
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Affiliation(s)
- David A Colby
- Department of Chemistry, University of California at Irvine, Irvine, CA 92697, USA
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McCluskey A, Sim ATR, Sakoff JA. Serine-threonine protein phosphatase inhibitors: development of potential therapeutic strategies. J Med Chem 2002; 45:1151-75. [PMID: 11881984 DOI: 10.1021/jm010066k] [Citation(s) in RCA: 194] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Adam McCluskey
- School of Biological & Chemical Science, Medicinal Chemistry Group, The University of Newcastle, Callaghan, NSW 2308, Australia.
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Affiliation(s)
- Hon Wai Lam
- School of Chemistry, University of Nottingham, University Park, NG7 2RD, UK
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Marshall JA, Yanik MM. Synthesis of a C1-C21 subunit of the protein phosphatase inhibitor tautomycin: a formal total synthesis. J Org Chem 2001; 66:1373-9. [PMID: 11312969 DOI: 10.1021/jo0056951] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The synthesis of a C1-C21 subunit of tautomycin is described. The convergent route employs enantioenriched allenylstannane and zinc reagents derived from (S)-3-butyn-2-ol methanesulfonate. These reagents react with appropriate aldehyde segments to yield syn and anti adducts with high diastereoselectivity. The derived lithioalkynes are joined stepwise to a CO equivalent, (MeONMe)2C=O, to afford an intermediate ketone which is converted to the core spiroketal moiety of tautomycin upon acid treatment. Chain elongation by another addition of the aforementioned allenylzinc reagent to a spiroketal aldehyde proceeds with high diastereoselectivity to install the remaining stereocenters. The resulting homopropargylic alcohol adduct is converted to a methyl ketone through intramolecular hydrosilylation of the alkyne and Tamao oxidation of the derived five-membered siloxane. This ketone proved identical to an intermediate employed by Chamberlin in a prior total synthesis of tautomycin.
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Affiliation(s)
- J A Marshall
- Department of Chemistry, McCormick Road, P.O. Box 400319, University of Virginia, Charlottesville, Virginia 22904, USA.
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Slade RM, Branchaud BP. Cross Coupling of Alkyl Cobaloximes with Maleic Anhydrides. Basic Studies and Applications to the Synthesis of Chaetomellic Acid A Anhydride and C-Glycosyl Maleic Anhydrides. J Org Chem 1998. [DOI: 10.1021/jo971852t] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Rachel M. Slade
- Department of Chemistry, University of Oregon, Eugene, Oregon 97403-1253
| | - Bruce P. Branchaud
- Department of Chemistry, University of Oregon, Eugene, Oregon 97403-1253
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Sabes SF, Urbanek RA, Forsyth CJ. Efficient Synthesis of Okadaic Acid. 2. Synthesis of the C1−C14 Domain and Completion of the Total Synthesis. J Am Chem Soc 1998. [DOI: 10.1021/ja973286p] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Steven F. Sabes
- Contribution from the Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455
| | - Rebecca A. Urbanek
- Contribution from the Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455
| | - Craig J. Forsyth
- Contribution from the Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455
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Nagumo S, Arai T, Akita H. Synthetic study of tautomycin. I synthesis and regioselective enzymatic acetylation of a spiroketal diol related to the C516 fragment. Tetrahedron Lett 1997. [DOI: 10.1016/s0040-4039(97)01118-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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31
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Gennari C, Vulpetti A, Pain G. Highly enantio- and diastereoselective boron aldol reactions of α-heterosubstituted thioacetates with aldehydes and silyl imines. Tetrahedron 1997. [DOI: 10.1016/s0040-4020(97)00251-2] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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