1
|
O'Rourke NF, Kier MJ, Micalizio GC. Metallacycle-Mediated Cross-Coupling in Natural Product Synthesis. Tetrahedron 2016; 72:7093-7123. [PMID: 27765997 PMCID: PMC5067085 DOI: 10.1016/j.tet.2016.08.053] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Natasha F O'Rourke
- Burke Laboratory, Department of Chemistry, Dartmouth College, Hanover, NH 03755, United States
| | - Matthew J Kier
- Burke Laboratory, Department of Chemistry, Dartmouth College, Hanover, NH 03755, United States
| | - Glenn C Micalizio
- Burke Laboratory, Department of Chemistry, Dartmouth College, Hanover, NH 03755, United States
| |
Collapse
|
2
|
Cai B, Evans RW, Wu J, Panek JS. Total Synthesis of Nuclear Factor of Activated T-Cells-68 (NFAT-68): Sequential Use of Chiral Allenylsilane and Titanium Alkoxide-Mediated Reductive Coupling Bond Construction. Org Lett 2016; 18:4304-7. [PMID: 27513364 DOI: 10.1021/acs.orglett.6b02052] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Highly enantioenriched chiral allenylsilanes 4 were prepared in high yield through a scalable synthetic sequence, employing a modified copper-catalyzed SN2' reaction. These reagents were used for the production of enantioenriched homoproparglylic ethers 5, which were subjected to titanium alkoxide-mediated reductive coupling with acetylenic esters to produce (E,E)-dienes 6 bearing α,β,γ,δ-unsaturated esters. Both enantiomers of nuclear factor of activated T-cells-68 (NFAT-68) were synthesized in five steps with the sequential use of the two methods.
Collapse
Affiliation(s)
- Bin Cai
- Department of Chemistry, Metcalf Center for Science and Engineering, Boston University , 590 Commonwealth Avenue, Boston, Massachusetts 02215, United States
| | - Ryan W Evans
- Department of Chemistry, Metcalf Center for Science and Engineering, Boston University , 590 Commonwealth Avenue, Boston, Massachusetts 02215, United States
| | - Jie Wu
- Department of Chemistry, Metcalf Center for Science and Engineering, Boston University , 590 Commonwealth Avenue, Boston, Massachusetts 02215, United States
| | - James S Panek
- Department of Chemistry, Metcalf Center for Science and Engineering, Boston University , 590 Commonwealth Avenue, Boston, Massachusetts 02215, United States
| |
Collapse
|
3
|
Cassidy JS, Mizoguchi H, Micalizio GC. Acceleration of metallacycle-mediated alkyne-alkyne cross-coupling with TMSCl. Tetrahedron Lett 2016; 57:3848-3850. [PMID: 27713588 DOI: 10.1016/j.tetlet.2016.07.045] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Investigation of titanium-centered metallacycle-mediated cross-coupling between unsymmetrical internal alkynes has led to the discovery that TMSCl significantly accelerates the C-C bond forming event. We report a collection of results that compare the efficiency of this reaction employing Ti(Oi-Pr)4/2n-BuLi in PhMe with and without TMSCl, demonstrating in every case that the presence of TMSCl has a profound impact on efficiency. While relevant in the context of developing this fundamental bond-forming process as an entry to more complex organometallic transformations, these modified reaction conditions allow coupling processes to be run at > 10 times the concentrations previously possible [in 2.4M n-BuLi (hexanes)], without the requirement of additional solvent. Finally, we demonstrate the effectiveness of these modified reaction conditions for the annulative cross-coupling between TMS-alkynes and 1,6-enynes leading to the formation of angularly substituted hydrindanes with, now well appreciated, high levels of regio- and stereoselection.
Collapse
Affiliation(s)
- James S Cassidy
- Department of Chemistry, Dartmouth College, Burke Laboratory, Hanover, NH 03755
| | - Haruki Mizoguchi
- Department of Chemistry, Dartmouth College, Burke Laboratory, Hanover, NH 03755
| | - Glenn C Micalizio
- Department of Chemistry, Dartmouth College, Burke Laboratory, Hanover, NH 03755
| |
Collapse
|
4
|
Kim HS, Woo TG, Lee HW. Synthesis of C5-C15 Subunit of Dictyostatin Using the Ring-Closing Metathesis Reaction of Silicon-tethered Intermediates. B KOREAN CHEM SOC 2015. [DOI: 10.1002/bkcs.10611] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Hyoung-Sang Kim
- Department of Chemistry; Chungbuk National University; Cheongju 362-763 Korea
| | - Tae-Gu Woo
- Department of Chemistry; Chungbuk National University; Cheongju 362-763 Korea
| | - Hyo Won Lee
- Department of Chemistry; Chungbuk National University; Cheongju 362-763 Korea
| |
Collapse
|
5
|
Yang D, Micalizio GC. Stereochemical lability of azatitanacyclopropanes: dynamic kinetic resolution in reductive cross-coupling reactions with allylic alcohols. Chem Commun (Camb) 2013; 49:8857-9. [PMID: 23963189 DOI: 10.1039/c3cc45607b] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Azatitanacyclopropanes (titanaziridines) are shown to be stereochemically labile under reaction conditions for reductive cross-coupling. This fundamental property has been employed to realize highly selective asymmetric coupling reactions with allylic alcohols that proceed by dynamic kinetic resolution.
Collapse
Affiliation(s)
- Dexi Yang
- Department of Chemistry, Dartmouth College, Hanover, NH 03755, USA.
| | | |
Collapse
|
6
|
Ho S, Bucher C, Leighton JL. A highly step-economical synthesis of dictyostatin. Angew Chem Int Ed Engl 2013; 52:6757-61. [PMID: 23666786 PMCID: PMC3812691 DOI: 10.1002/anie.201302565] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2013] [Indexed: 11/10/2022]
Affiliation(s)
- Stephen Ho
- Department of Chemistry, Columbia University, 3000 Broadway, New York, NY 10027, USA
| | - Cyril Bucher
- Department of Chemistry, Columbia University, 3000 Broadway, New York, NY 10027, USA
| | - James L. Leighton
- Department of Chemistry, Columbia University, 3000 Broadway, New York, NY 10027, USA
| |
Collapse
|
7
|
Ho S, Bucher C, Leighton JL. A Highly Step-Economical Synthesis of Dictyostatin. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201302565] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
8
|
Macé A, Tripoteau F, Zhao Q, Gayon E, Vrancken E, Campagne JM, Carboni B. Tandem reactions involving 1-silyl-3-boryl-2-alkenes. New access to (Z)-1-fluoro-1-alkenes, allyl fluorides, and diversely α-substituted allylboronates. Org Lett 2013; 15:906-9. [PMID: 23391173 DOI: 10.1021/ol4000263] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The reactions of 1-silyl-3-boryl-2-alkenes with various electrophilic reagents (Selectfluor, N-halosuccinimides, benzhydryl, and propargylic alcohols in the presence of a Lewis acid, N-alkoxycarbonyliminium ion) have been investigated as new routes to α-substituted allylboronates. Further functional transformations, including allylboration, Suzuki coupling, protodeboronation, and cycloisomerization, have been carried out to illustrate the synthetic potential of these γ-borylallylsilanes.
Collapse
Affiliation(s)
- Aurélie Macé
- Institut des Sciences Chimiques de Rennes, UMR 6626 CNRS-Université de Rennes 1, Campus de Beaulieu, 35042 Rennes Cedex, France
| | | | | | | | | | | | | |
Collapse
|
9
|
Wu J, Pu Y, Panek JS. Divergent synthesis of functionalized carbocycles through organosilane-directed asymmetric alkyne-alkene reductive coupling and annulation sequence. J Am Chem Soc 2012; 134:18440-6. [PMID: 23057751 DOI: 10.1021/ja3083945] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An organosilane-directed alkyne-alkene reductive coupling of readily available propargylsilanes is used to access densely functionalized chiral allylsilanes. The divergent reactivity of the allylsilanes can be controlled to afford a range of novel carbocyclic ring systems through an intramolecular allylation, [3+2] annulation, and Sakurai-like homodimerization.
Collapse
Affiliation(s)
- Jie Wu
- Department of Chemistry and Center for Chemical Methodology and Library Development, Boston University, Boston, Massachusetts 02215, USA
| | | | | |
Collapse
|
10
|
Zhu Y, Burgess K. Filling gaps in asymmetric hydrogenation methods for acyclic stereocontrol: application to chirons for polyketide-derived natural products. Acc Chem Res 2012; 45:1623-36. [PMID: 23035731 DOI: 10.1021/ar200145q] [Citation(s) in RCA: 104] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The large volume of research studying hydrogenation catalysis might suggest that stereoselective hydrogenation of alkenes is a solved problem, but we believe the most important parts of asymmetric hydrogenation methodology remain unmastered. The most popular chiral catalysts, Rh- and Ir-diphosphine complexes, do not hydrogenate the largest categories of prochiral alkenes, hindered tri- and tetra-substituted ones, at useful rates unless the substrate has a "classical" coordinating functional group (CFG), for example, amides or homoallylic alcohols, to anchor the substrate to the metal. Therefore, while many methods are available for the asymmetric hydrogenation of alkenes with appropriate CFGs, synthetic chemistry would benefit from chiral hydrogenations of substrates with functional groups that typically do not coordinate in Rh- and Ir-diphosphine complexes. In this Account, we demonstrate the application of chiral analogues of Crabtree's catalyst to asymmetric hydrogenations of coordinating unfunctionalized, trisubstituted alkenes. Crabtree's catalyst, a complex of iridium with 1,5-cyclooctadiene, tris-cyclohexylphosphine, and pyridine, differs from Rh- and Ir-diphosphine complexes, which we broadly refer to as "chiral analogues of Wilkinson's catalyst." Crabtree's catalyst analogues hydrogenate substrates that do not contain functionalities generally recognized as CFGs, and we propose reasons for this chemistry based on the catalytic mechanisms. Thus, chiral analogues of Crabtree's catalyst facilitate many hydrogenations that would not be possible using Rh- or Ir-diphosphine complexes. Directed hydrogenations have been used in acyclic stereocontrol for decades, but the realization that these catalysts can be used for acyclic stereocontrol without the types of directing groups that are necessary for other hydrogenations significantly broadens the scope of hydrogenations for this purpose. Recently, we have prepared chirons for polyketide-derived natural products using an N,carbene-Ir complex (1). This approach has led to catalytic syntheses of several important chirons to facilitate preparations of these ubiquitous natural products.
Collapse
Affiliation(s)
- Ye Zhu
- Department of Chemistry, Texas A & M University, College Station, 77841, United States
| | | |
Collapse
|
11
|
Gallon J, Esteban J, Bouzbouz S, Campbell M, Reymond S, Cossy J. Formal Synthesis of Dictyostatin and Synthesis of Two Dictyostatin Analogues. Chemistry 2012; 18:11788-97. [DOI: 10.1002/chem.201201001] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2012] [Revised: 06/05/2012] [Indexed: 02/06/2023]
|
12
|
Diez PS, Micalizio GC. Convergent synthesis of deoxypropionates. Angew Chem Int Ed Engl 2012; 51:5152-6. [PMID: 22488893 DOI: 10.1002/anie.201200035] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2012] [Revised: 02/20/2012] [Indexed: 11/11/2022]
Affiliation(s)
- Peter S Diez
- Department of Chemistry, The Scripps Research Institute, 130 Scripps Way #3A2, Jupiter, FL 33458, USA
| | | |
Collapse
|
13
|
|
14
|
Jeso V, Cherry L, Macklin TK, Pan SC, LoGrasso PV, Micalizio GC. Convergent synthesis and discovery of a natural product-inspired paralog-selective Hsp90 inhibitor. Org Lett 2011; 13:5108-11. [PMID: 21866939 DOI: 10.1021/ol2019828] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A convergent synthesis of benzoquinone ansamycin analogs is described that proceeds by a sequence of metallacycle-mediated alkyne-alkyne coupling, followed by site- and stereoselective dihydroxylation and global carbamate formation. These studies have led to (1) validation of alkyne-alkyne coupling to produce geldanamycin analogs that lack the problematic quinone, (2) the discovery that C6-C7 bis-carbamate functionality is compatible with Hsp90 inhibition, and (3) the identification of 1 as a nonquinone geldanamycin-inspired paralog-selective Hsp90 inhibitor.
Collapse
Affiliation(s)
- Valer Jeso
- Department of Chemistry, The Scripps Research Institute, Jupiter, Florida 33458, USA
| | | | | | | | | | | |
Collapse
|
15
|
Zanato C, Pignataro L, Ambrosi A, Hao Z, Trigili C, Díaz JF, Barasoain I, Gennari C. Highly Stereoselective Total Synthesis of (+)-9-epi-Dictyostatin and (-)-12,13-Bis-epi-dictyostatin. European J Org Chem 2011. [DOI: 10.1002/ejoc.201100244] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
16
|
|
17
|
Ferreiro-Mederos L, Vila-Gisbert S, Urbano A, Carreño MC, Colobert F. Stereoselective synthesis of the C15-C26 fragment of the antitumor agent (-)-dictyostatin. Org Biomol Chem 2010; 9:758-64. [PMID: 21082125 DOI: 10.1039/c0ob00491j] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis of the C15-C26 fragment of (-)-dictyostatin is reported in 10 steps and 28% overall yield. The key steps are the two stereoselective sulfoxide-directed processes: a Reformatsky-type reaction and a β-keto sulfoxide reduction.
Collapse
Affiliation(s)
- Leticia Ferreiro-Mederos
- Departamento de Química Orgánica (Módulo 01), Universidad Autónoma de Madrid, 28049, Madrid, Spain
| | | | | | | | | |
Collapse
|
18
|
Zanato C, Pignataro L, Ambrosi A, Hao Z, Gennari C. A Highly Stereoselective Total Synthesis of (+)-9-epi-Dictyostatin. European J Org Chem 2010. [DOI: 10.1002/ejoc.201001018] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
19
|
Paterson I, Britton R, Delgado O, Gardner NM, Meyer A, Naylor GJ, Poullennec KG. Total synthesis of (−)-dictyostatin, a microtubule-stabilising anticancer macrolide of marine sponge origin. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.01.083] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
20
|
Yadav JS, Rajender V. Studies Directed Towards the Total Synthesis of (-)-Dictyostatin. European J Org Chem 2010. [DOI: 10.1002/ejoc.200901448] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
21
|
Perez LJ, Shimp HL, Micalizio GC. Stereoselective synthesis of trisubstituted (E,E)-1,3-dienes by the site-selective reductive cross-coupling of internal alkynes with terminal alkynes: a fragment coupling reaction for natural product synthesis. J Org Chem 2009; 74:7211-9. [PMID: 19722544 DOI: 10.1021/jo901451c] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A highly selective convergent coupling reaction is described between alkynes for the synthesis of stereodefined trisubstituted (E,E)-1,3-dienes-structural motifs commonly found embedded in the skeletons of bioactive polyketide-derived natural products. While numerous multistep processes for the synthesis of this stereodefined functional group exist, the current method represents a significant advance as it does not require stereodefined olefinic coupling partners (vinyl halide or vinyl organometallic); it proceeds by a single convergent C-C bond-forming event (avoiding multistep methods based on carbonyl olefination) and is tolerant of a diverse array of functional groups including free hydroxyls. Through a systematic study of titanium-mediated reductive cross-coupling reactions of internal alkynes with terminal alkynes, a fragment coupling reaction of great utility in natural product synthesis has emerged. Here, use of a proximal hydroxy group to control regioselection in the functionalization of a preformed titanacyclopropene has led to the establishment of a highly selective bimolecular coupling process, where C-C bond formation occurs in concert with the establishment of two stereodefined alkenes. Compared to the body of literature known for related metal-mediated coupling reactions, the current work defines a powerful advance, achieving site-selective bimolecular C-C bond formation without the need for using TMS-alkynes or conjugated alkynes. Overall, complex 1,3-dienes relevant for the synthesis of polyketide-derived natural products of varying stereochemistry were prepared with typically >or=20:1 selectivity, defining the important role of an alkoxide directing group located delta to preformed titanacyclopropenes.
Collapse
Affiliation(s)
- Lark J Perez
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, USA
| | | | | |
Collapse
|