51
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Nugent WA. "Black Swan events" in organic synthesis. Angew Chem Int Ed Engl 2012; 51:8936-49. [PMID: 22893229 DOI: 10.1002/anie.201202348] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2012] [Indexed: 11/11/2022]
Abstract
When a research area "goes viral", the event typically occurs in conjunction with a major change in "conventional wisdom". In retrospect, the literature often contains earlier hints that the original judgment was not correct. These antecedents are referred to as "Black Swan" events. The picture shows research on homogeneous gold catalysis "going viral".
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Affiliation(s)
- William A Nugent
- Chemical Development Department, Vertex Pharmaceuticals, Inc., Cambridge, USA.
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52
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Chen M, Roush WR. Enantioselective synthesis of anti- and syn-homopropargyl alcohols via chiral Brønsted acid catalyzed asymmetric allenylboration reactions. J Am Chem Soc 2012; 134:10947-52. [PMID: 22731887 PMCID: PMC3474359 DOI: 10.1021/ja3031467] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Chiral Brønsted acid catalyzed asymmetric allenylboration reactions are described. Under optimized conditions, anti-homopropargyl alcohols 2 are obtained in high yields with excellent diastereo- and enantioselectivities from stereochemically matched aldehyde allenylboration reactions with (M)-1 catalyzed by the chiral phosphoric acid (S)-4. The syn-isomers 3 can also be obtained in good diastereoselectivities and excellent enantioselectivities from the mismatched allenylboration reactions of aromatic aldehydes using (M)-1 in the presence of the enantiomeric phosphoric acid (R)-4. The stereochemistry of the methyl group introduced into 2 and 3 is controlled by the chirality of the allenylboronate (M)-1, whereas the configuration of the new hydroxyl stereocenter is controlled by the enantioselectivity of the chiral phosphoric acid catalyst used in these reactions. The synthetic utility of this methodology was further demonstrated in highly diastereoselective syntheses of a variety of anti, anti-stereotriads, the direct synthesis of which has constituted a significant challenge using previous generations of aldol and crotylmetal reagents.
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Affiliation(s)
- Ming Chen
- Department of Chemistry, Scripps Florida, Jupiter, Florida 33458
| | - William R. Roush
- Department of Chemistry, Scripps Florida, Jupiter, Florida 33458
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53
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Okada Y, Asakura N, Bando M, Ashikaga Y, Yamada H. Completely β-selective glycosylation using 3,6-O-(o-xylylene)-bridged axial-rich glucosyl fluoride. J Am Chem Soc 2012; 134:6940-3. [PMID: 22475375 DOI: 10.1021/ja301480g] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A completely β-selective glycosylation that does not rely on neighboring group participation is described. The novelty of this work is the design of the glycosyl donor locked into the axial-rich form by the o-xylylene bridge between the 3-O and 6-O of d-glucopyranose. The synthesized 2,4-di-O-benzyl-3,6-O-(o-xylyene)glucopyranosyl fluoride could efficiently react with various alcohols in a SnCl(2)-AgB(C(6)F(5))(4) catalytic system. The mechanism composed of the glycosylation and isomerization cycles was revealed through comparative experiments using acidic and basic molecular sieves. The achieved perfect stereocontrol is attributed to the synergy of the axial-rich conformation and convergent isomerization caused by HB(C(6)F(5))(4) generated in situ.
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Affiliation(s)
- Yasunori Okada
- School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda 669-1337, Japan
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54
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Alkyl 2-(2-benzothiazolylsulfinyl)acetates as useful synthetic reagents for alkyl 4-hydroxyalk-2-enoates by sulfinyl-Knoevenagel reaction. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.01.057] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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55
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Chen M, Roush WR. Highly stereoselective synthesis of anti,anti-dipropionate stereotriads: a solution to the long-standing problem of challenging mismatched double asymmetric crotylboration reactions. J Am Chem Soc 2012; 134:3925-31. [PMID: 22332989 DOI: 10.1021/ja300472a] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The stereocontrolled synthesis of the β-branched anti,anti-dipropionate stereotriad 4 via aldol or crotylmetal chemistry represents a historical challenge to the organic synthesis community. Here we describe a general solution to the long-standing problem associated with the synthesis of 4 by utilizing mismatched double asymmetric crotylboration reactions of enantioenriched α-methyl substituted aldehydes with the chiral, nonracemic crotylborane reagent (S)-(E)-22 (or its enantiomer). This method not only provides direct access to anti,anti-dipropionate stereotriads 24 [a synthetic equivalent of 4] with very good (5-8:1) if not excellent (≥15:1) diastereoselectivity from β-branched chiral aldehydes with ≤50:1 intrinsic diastereofacial selectivity preferences but also provides a vinylstannane unit in the products that is properly functionalized for use in subsequent C-C bond-forming events. We anticipate that this method will be widely applicable and will lead to substantial simplification of strategies for synthesis of polyketide natural products.
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Affiliation(s)
- Ming Chen
- Department of Chemistry, Scripps Florida, Jupiter, Florida 33458, USA
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56
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Carroll VM, Jeyakumar M, Carlson KE, Katzenellenbogen JA. Diarylpropionitrile (DPN) enantiomers: synthesis and evaluation of estrogen receptor β-selective ligands. J Med Chem 2011; 55:528-37. [PMID: 22122563 DOI: 10.1021/jm201436k] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Two estrogen receptor (ER) subtypes, ERα and ERβ, mediate the actions of estrogens in diverse reproductive and nonreproductive target tissues. ER subtype-selective ligands, which bind to and activate these subtypes differentially, have proved to be useful in elucidating which actions of estrogens proceed through ERα vs ERβ. Some of these ligands show potential as novel therapeutic agents. Diarylpropionitrile (DPN), an ERβ selective ligand that we developed, is a chiral molecule, but it has been studied almost exclusively as the racemic mixture (rac-DPN, 1). Herein we report the development of an efficient enantioselective synthesis of the two isomers, R-DPN (3) and S-DPN (2), and we have compared the in vitro ligand binding affinities, coactivator binding affinities, recruitment potencies, and cellular transcriptional potencies of these isomers. Both enantiomers show a very high affinity and potency preference for ERβ over ERα, typically in the range of 80-300-fold. Although the enantioselectivity is only modest (3-4-fold), the R-enantiomer is the higher affinity and more potent isomer. While ERβ can be effectively and selectively stimulated by rac-DPN or by either R-DPN or S-DPN, R-DPN might be the preferred member of this isomeric series for biological studies of ERβ function.
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Affiliation(s)
- Vincent M Carroll
- Department of Chemistry, University of Illinois, 600 South Mathews Avenue, Urbana, Illinois 61801, United States
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57
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Perali RS, Mandava S, Chunduri VR. An unexpected migration of O-silyl group under Mitsunobu reaction conditions. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2011.04.015] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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58
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Duschek A, Kirsch SF. 2-Iodoxybenzoic Acid-A Simple Oxidant with a Dazzling Array of Potential Applications. Angew Chem Int Ed Engl 2011; 50:1524-52. [DOI: 10.1002/anie.201000873] [Citation(s) in RCA: 205] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2010] [Indexed: 12/26/2022]
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59
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Duschek A, Kirsch SF. 2-Iodoxybenzoesäure - ein einfaches Oxidationsmittel mit einer Vielfalt an Anwendungsmöglichkeiten. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201000873] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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60
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Trajkovic M, Ferjancic Z, Saicic RN. An aldol approach to the enantioselective synthesis of (−)-oseltamivir phosphate. Org Biomol Chem 2011; 9:6927-9. [DOI: 10.1039/c1ob06248d] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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61
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Jewett JC, Rawal VH. Temporary restraints to overcome steric obstacles: an efficient strategy for the synthesis of mycalamide B. Angew Chem Int Ed Engl 2010; 49:8682-5. [PMID: 20931583 DOI: 10.1002/anie.201003361] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- John C Jewett
- Department of Chemistry, The University of Chicago, 5735 South Ellis Avenue, Chicago, IL 60637, USA
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62
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Jewett JC, Rawal VH. Temporary Restraints To Overcome Steric Obstacles: An Efficient Strategy for the Synthesis of Mycalamide B. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.201003361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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63
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Lassen KM, Joullié MM. Total synthesis of Lys(3) tamandarin M: a potential affinity ligand. Org Lett 2010; 12:5306-9. [PMID: 21033723 DOI: 10.1021/ol1024212] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The synthesis of Lys(3) tamandarin M is described. This analogue can be used as a protein affinity ligand to probe the mechanism of action of this unique class of molecules.
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Affiliation(s)
- Kenneth M Lassen
- Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104, United States
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64
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Abdou WM. Chemical Reactivity of Alkylidene Phosphoranes and the Relevant Phosphonium Salts Toward Some Carbon-Nitrogen Systems. PHOSPHORUS SULFUR 2010. [DOI: 10.1080/10426500210248] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Wafaa M. Abdou
- a National Research Centre , Dokki, Cairo , 12622 , Egypt
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65
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Nishiyama T, Kusumoto Y, Okumura K, Hara K, Kusaba S, Hirata K, Kamiya Y, Isobe M, Nakano K, Kotsuki H, Ichikawa Y. Synthesis of Glycocinnasperimicinâ
D. Chemistry 2010; 16:600-10. [DOI: 10.1002/chem.200901745] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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66
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Abstract
We report the determination of the full stereostructure of (-)-ushikulide A (1), a spiroketal containing macrolide by total synthesis. Ushikulide A (1) was isolated from a culture broth of Streptomyces sp. IUK-102 and exhibits potent immunosuppressant activity (IC(50) = 70 nM). To embark upon an ushikulide A synthesis, a tentative assignment was made based on analogy to cytovaricin (2), a related macrolide isolated from a culture of Streptomyces diastatochromogenes whose full structure was previously established via synthesis and X-ray crystallography. This report delineates studies on several key steps, namely a direct aldol reaction catalyzed by the dinuclear zinc ProPhenol complex, a metal catalyzed spiroketalization, as well as application of an unprecedented asymmetric alkynylation of a simple saturated aldehyde with methyl propiolate to prepare the nucleophilic partner for a Marshall-Tamaru propargylation. These studies culminated in the first total synthesis and stereochemical assignment of (-)-ushikulide A and significantly extended the scope of the above-mentioned methodologies.
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Affiliation(s)
- Barry M. Trost
- Department of Chemistry, Stanford University, Stanford, California, 94305-5080
| | - Brendan M. O’Boyle
- Department of Chemistry, Stanford University, Stanford, California, 94305-5080
| | - Daniel Hund
- Department of Chemistry, Stanford University, Stanford, California, 94305-5080
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67
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Bis(2-t-butylphenyl)phosphonoacetamides for the highly cis-selective synthesis of α,β-unsaturated amides. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.07.130] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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68
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Nebot J, Romea P, Urpí F. Stereoselective Synthesis of Highly Functionalized Structures from Lactate-Derived Halo Ketones. J Org Chem 2009; 74:7518-21. [DOI: 10.1021/jo9010798] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Joaquim Nebot
- Departament de Química Orgànica, Universitat de Barcelona, Martí i Franqués 1-11, 08028 Barcelona, Catalonia, Spain
| | - Pedro Romea
- Departament de Química Orgànica, Universitat de Barcelona, Martí i Franqués 1-11, 08028 Barcelona, Catalonia, Spain
| | - Fèlix Urpí
- Departament de Química Orgànica, Universitat de Barcelona, Martí i Franqués 1-11, 08028 Barcelona, Catalonia, Spain
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69
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Gao Z, Li Y, Cooksey J, Snaddon T, Schunk S, Viseux E, McAteer S, Kocienski P. A Synthesis of an Ionomycin Calcium Complex. Angew Chem Int Ed Engl 2009; 48:5022-5. [DOI: 10.1002/anie.200901608] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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70
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Gao Z, Li Y, Cooksey J, Snaddon T, Schunk S, Viseux E, McAteer S, Kocienski P. A Synthesis of an Ionomycin Calcium Complex. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200901608] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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71
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72
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ZHAO J, CHEN A, LIU Q. Enantioselective Direct Aldol Reactions Catalyzed by Cinchonine-derived Prolinamides. CHINESE J CHEM 2009. [DOI: 10.1002/cjoc.200990158] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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73
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Trost BM, O'Boyle BM. Exploiting orthogonally reactive functionality: synthesis and stereochemical assignment of (-)-ushikulide A. J Am Chem Soc 2009; 130:16190-2. [PMID: 18989964 DOI: 10.1021/ja807127s] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In spite of the tremendous advances in modern spectroscopic methods, organic synthesis continues to play a pivotal role in elucidating the full structures of complex natural products. This method has the advantage that, even in the absence of a firm structural assignment, a combination of logic and spectroscopic comparison can arrive at the correct structure. Herein, we report execution of this strategy with respect to ushikulide A, a newly isolated and previously stereochemically undefined member of the oligomycin-rutamycin family. To maximize synthetic efficiency, we envisioned chemoselective manipulation of orthogonally reactive functional groups, notably alkenes and alkynes as surrogates for certain carbonyl and hydroxyl functionalities. This approach has the dual effect of minimizing the number of steps and protecting groups required for our synthetic route. This strategy culminated in the efficient synthesis and stereochemical assignment of ushikulide A.
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Affiliation(s)
- Barry M Trost
- Department of Chemistry, Stanford University, Stanford, California 94305-5080, USA.
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74
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Krohn K, Ahmed I, Gehle D, Sahli MA. Open Chain Chiral Macrolide Building Blocks by Opening of Deoxygenated 1,6-Anhydrosugars with 1,3-Propanedithiol. J Carbohydr Chem 2009. [DOI: 10.1080/07328300802691851] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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75
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Gawas D, Kazmaier U. Highly diastereoselective anti-aldol reactions of glycolate titanium enolates. J Org Chem 2009; 74:1788-90. [PMID: 19125691 DOI: 10.1021/jo8025466] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Diastereoselective aldol reactions of enolates of alpha-hydroxy ester with different aldehydes are metal tunable, providing either anti- or syn- products. The highest anti-selectivities were obtained with TiCl(OiPr)(3), while Ti(OiPr)(4) provides the opposite syn-products.
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Affiliation(s)
- Dnyaneshwar Gawas
- Institut für Organische Chemie, Universität des Saarlandes, 66123 Saarbrücken, Germany
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76
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Yamakoshi H, Ikarashi F, Minami M, Shibuya M, Sugahara T, Kanoh N, Ohori H, Shibata H, Iwabuchi Y. Syntheses of naturally occurring cytotoxic [7.7]paracyclophanes, (−)-cylindrocyclophane A and its enantiomer, and implications for biological activity. Org Biomol Chem 2009; 7:3772-81. [DOI: 10.1039/b909646a] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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77
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Evans DA, Kvaernø L, Dunn TB, Beauchemin A, Raymer B, Mulder JA, Olhava EJ, Juhl M, Kagechika K, Favor DA. Total synthesis of (+)-azaspiracid-1. An exhibition of the intricacies of complex molecule synthesis. J Am Chem Soc 2008; 130:16295-309. [PMID: 19006391 PMCID: PMC3408805 DOI: 10.1021/ja804659n] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The synthesis of the marine neurotoxin azaspiracid-1 has been accomplished. The individual fragments were synthesized by catalytic enantioselective processes: A hetero-Diels-Alder reaction to afford the E- and HI-ring fragments, a carbonyl-ene reaction to furnish the CD-ring fragment, and a Mukaiyama aldol reaction to deliver the FG-ring fragment. The subsequent fragment couplings were accomplished by aldol and sulfone anion methodologies. All ketalization events to form the nonacyclic target were accomplished under equilibrating conditions utilizing the imbedded configurations of the molecule to adopt one favored conformation. A final fragment coupling of the anomeric EFGHI-sulfone anion to the ABCD-aldehyde completed the convergent synthesis of (+)-azaspiracid-1.
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Affiliation(s)
- David A Evans
- Department of Chemistry & Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, USA.
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78
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79
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Díaz-Oltra S, Carda M, Murga J, Falomir E, Marco J. Aldol Reactions between L-Erythrulose Derivatives and Chiral α-Amino and α-Fluoro Aldehydes: Competition between Felkin-Anh and Cornforth Transition States. Chemistry 2008; 14:9240-54. [DOI: 10.1002/chem.200800956] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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80
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Pragani R, Roush WR. Studies on the synthesis of durhamycin A: stereoselective synthesis of a model aglycone. Org Lett 2008; 10:4613-6. [PMID: 18808128 DOI: 10.1021/ol8018727] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A stereoselective synthesis of the model aglycone corresponding to the anti-HIV aureolic acids durhamycins A (1) and B (2) is described.
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Affiliation(s)
- Rajan Pragani
- Department of Chemistry, Scripps Florida, Jupiter, Florida 33458, USA
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81
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Abstract
A standard for gauging the efficiency of synthetic strategies has been proposed. Synthetic efficiency is correlated to the molecular-complexity index, which is the cumulative total number of chiral centers, independent functional groups, and rings contained in a molecule. The number of reaction steps for an efficient synthetic design must be smaller than that of molecular-complexity index. This standard will motivate organic chemists to work harder on the synthetic design prior to execution.Key words: strategic efficiency, total synthesis, synthetic design, complexity index.
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82
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Denmark SE, Chung WJ. Lewis Base Activation of Lewis Acids: Catalytic, Enantioselective Addition of Glycolate-Derived Silyl Ketene Acetals to Aldehydes. J Org Chem 2008; 73:4582-95. [DOI: 10.1021/jo8006539] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Scott E. Denmark
- Department of Chemistry, Roger Adams Laboratory, University of Illinois, Urbana, Illinois 61801
| | - Won-jin Chung
- Department of Chemistry, Roger Adams Laboratory, University of Illinois, Urbana, Illinois 61801
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83
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Sasaki K, Matsumura S, Toshima K. Toward the total synthesis of vineomycin B2: application of an efficient glycosylation methodology using 2,3-unsaturated sugars. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2007.07.145] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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84
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Kim WH, Hong SK, Lim SM, Ju MA, Jung SK, Kim YW, Jung JH, Kwon MS, Lee E. Stereoselective synthesis of (+)-IKD-8344. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.07.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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85
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Ley SV, Sheppard TD, Myers RM, Chorghade MS. Chiral Glycolate Equivalents for the Asymmetric Synthesis of α-Hydroxycarbonyl Compounds. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2007. [DOI: 10.1246/bcsj.80.1451] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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86
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Soorukram D, Knochel P. Copper-catalyzed preparation of ketones bearing a stereogenic center in alpha position. Angew Chem Int Ed Engl 2007; 45:3686-9. [PMID: 16646096 DOI: 10.1002/anie.200600247] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Darunee Soorukram
- Department Chemie and Biochemistry, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, Haus F, 81377 München, Germany
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87
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Ferber B, Kagan H. Metallocene Sulfoxides as Precursors of Metallocenes with Planar Chirality. Adv Synth Catal 2007. [DOI: 10.1002/adsc.200600639] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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88
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Abstract
A formal synthesis of psymberin (irciniastatin A) is presented. Notable features of the synthesis include the chemo-, regio-, and stereoselective oxidation of a 1,3-disubstituted allene, a configuration-dependent spirodiepoxide opening, the efficient syntheses of functionalized trans-2,6-disubstituted pyrans, and the union of a highly functionalized aldehyde with a pentasubstituted aryl homoenolate to give a dihydroisocumarin. [structure: see text]
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Affiliation(s)
- Ning Shangguan
- Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA
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89
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Jasper C, Adibekian A, Busch T, Quitschalle M, Wittenberg R, Kirschning A. Total synthesis of cyclic diterpene tonantzitlolone based on a highly stereoselective substrate-controlled aldol reaction and ring-closing metathesis. Chemistry 2007; 12:8719-34. [PMID: 16955524 DOI: 10.1002/chem.200600082] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The total synthesis of the cyclic diterpene ent-tonantzitlolone (ent-1) is presented. Key steps for assembling the macrocyclic core structure of 1 are a highly selective aldol reaction and an E selective ring-closing metathesis reaction. A detailed investigation of these two steps and the final transformations towards the completion of the synthesis is disclosed.
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Affiliation(s)
- Christian Jasper
- Universität Basel, Departement Chemie, Spitalstrasse 51, 4065 Basel, Switzerland
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90
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K. Gallos J, S. Alexandraki E, I. Stathakis C. Efficient Synthesis of (±)-N-Boc-pregabalin via Hetero-Diels-Alder Addition of Methyl 3-Nitrosoacrylate to Ethyl Vinyl Ether. HETEROCYCLES 2007. [DOI: 10.3987/com-07-10994] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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91
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Mohapatra DK, Mondal D, Chorghade MS, Gurjar MK. General strategy for a short and efficient synthesis of 3-hydroxy-4-methylprolines (HMP). Tetrahedron Lett 2006. [DOI: 10.1016/j.tetlet.2006.10.137] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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92
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Fuller NO, Morken JP. Studies on the synthesis of the inostamycin natural products: a reductive aldol/reductive Claisen approach to the C10-C24 ketone fragment. Org Lett 2006; 7:4867-9. [PMID: 16235909 DOI: 10.1021/ol0516115] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[reaction: see text] An approach to the C10-C24 ketone fragment of the inostamycin family of polyether antibiotics is described. The synthetic strategy utilizes an asymmetric Rh-catalyzed reductive aldol reaction and a stereoselective Rh-catalyzed reductive Claisen rearrangement as the key steps in formation of alkene and vinyl iodide synthons, respectively.
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Affiliation(s)
- Nathan O Fuller
- Department of Chemistry, Venable and Kenan Laboratories, University of North Carolina at Chapel Hill, 27599-3290, USA
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93
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Kim WH, Hong SK, Lim SM, Ju MA, Jung SK, Kim YW, Jung JH, Kwon MS, Lee E. Total Synthesis of IKD-8344. Angew Chem Int Ed Engl 2006. [DOI: 10.1002/ange.200602860] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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94
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Kim WH, Hong SK, Lim SM, Ju MA, Jung SK, Kim YW, Jung JH, Kwon MS, Lee E. Total Synthesis of IKD-8344. Angew Chem Int Ed Engl 2006; 45:7072-5. [PMID: 17013954 DOI: 10.1002/anie.200602860] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Woo Han Kim
- Department of Chemistry, College of Natural Sciences, Seoul National University, Seoul 151-747, Korea
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95
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Martinelli JR, Freckmann DMM, Buchwald SL. Convenient Method for the Preparation of Weinreb Amides via Pd-Catalyzed Aminocarbonylation of Aryl Bromides at Atmospheric Pressure. Org Lett 2006; 8:4843-6. [PMID: 17020317 DOI: 10.1021/ol061902t] [Citation(s) in RCA: 86] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[reaction: see text] The direct transformation of aryl bromides into the corresponding Weinreb amides via Pd-catalyzed aminocarbonylation at atmospheric pressure is reported.
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Affiliation(s)
- Joseph R Martinelli
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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96
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Stereoselective construction of the octalin unit of symbioimine using an intramolecular Diels–Alder reaction. Tetrahedron Lett 2006. [DOI: 10.1016/j.tetlet.2006.07.012] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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97
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Caron S, Dugger RW, Ruggeri SG, Ragan JA, Ripin DHB. Large-Scale Oxidations in the Pharmaceutical Industry. Chem Rev 2006; 106:2943-89. [PMID: 16836305 DOI: 10.1021/cr040679f] [Citation(s) in RCA: 546] [Impact Index Per Article: 30.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Stéphane Caron
- Chemical Research and Development, Pfizer Global Research Division, Pfizer Inc., Eastern Point Road, Groton, Connecticut 06340, USA
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98
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Narayana Manjunath B, Sane NP, Singh Aidhen I. New Reagent for Convenient Access to the α,β-UnsaturatedN-Methoxy-N-methyl-amide Functionality by a Synthesis Based on the Julia Olefination Protocol. European J Org Chem 2006. [DOI: 10.1002/ejoc.200600126] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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99
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Soorukram D, Knochel P. Kupfer-katalysierte Synthese von Ketonen mit α-stereogenem Zentrum. Angew Chem Int Ed Engl 2006. [DOI: 10.1002/ange.200600247] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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100
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Parenty A, Moreau X, Campagne JM. Macrolactonizations in the total synthesis of natural products. Chem Rev 2006; 106:911-39. [PMID: 16522013 DOI: 10.1021/cr0301402] [Citation(s) in RCA: 383] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- A Parenty
- Institut de Chimie des Substances Naturelles, Avenue de la Terrasse, F-91198 Gif sur Yvette, France
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