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Cooksey JP, Saidi O, Williams JM, Blacker AJ, Marsden SP. Oxidative Pictet-Spengler cyclisations through acceptorless iridium-catalysed dehydrogenation of tertiary amines. Tetrahedron 2021. [DOI: 10.1016/j.tet.2020.131785] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Lee K. A New Synthesis of Phosphorane Ylide Precursors to Vicinal Tricarbonyls from Alkyl Halides Utilizing a Novel Phenylsulfonyl Reagent. JOURNAL OF THE KOREAN CHEMICAL SOCIETY-DAEHAN HWAHAK HOE JEE 2015. [DOI: 10.5012/jkcs.2015.59.6.537] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Kong C, Su N, Zhou F, Jana N, Driver TG. Probing the origin of carboxylate migration selectivity in Rh2(II)-catalyzed N-heterocycle formation from trisubstituted styryl azides. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.01.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Bashiardes G, Bodwell GJ, Collingwood SP, Costello JF, Davies SG, Fletcher AM, Garner A, Preston SC, Thomson JE. Stereoselective syntheses of substituted succinic acid derivatives of the iron chiral auxiliary [(η5-C5H5)Fe(CO)(PPh3)]. Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.09.049] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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5
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Senthilkumar S, Prasad SS, Kumar PS, Baskaran S. A diversity oriented one-pot synthesis of novel iminosugar C-glycosides. Chem Commun (Camb) 2014; 50:1549-51. [DOI: 10.1039/c3cc48370c] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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Lee KS. tert-Butyl 3-Oxo-4-(phenylsulfinyl)-2-(triphenyl-λ 5-phosphanylidene)butanoate: A New Reagent for the Efficient Synthesis of Triphenylphosphorane Ylide Precursors to Vicinal Tricarbonyls from Alkyl Halides. B KOREAN CHEM SOC 2011. [DOI: 10.5012/bkcs.2011.32.9.3477] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Lippert AR, Naganawa A, Keleshian VL, Bode JW. Synthesis of phototrappable shape-shifting molecules for adaptive guest binding. J Am Chem Soc 2011; 132:15790-9. [PMID: 20945902 DOI: 10.1021/ja107314p] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
We have designed and synthesized oligosubstituted bullvalenes 1 and 2 as adaptive molecules that can change their shapes in order to bind tightly to a suitable guest. By incorporation of a photolabile o-nitroveratryloxycarbonate (NVOC) group into bullvalenes 1 and 2, tightly binding species can be selectively isolated from a population of hundreds of interconverting structural isomers. Spontaneous strain-assisted Cope rearrangements allow these shape-shifting molecules to exist in a dynamic equilibrium of configurationally distinct valence isomers, as revealed by dynamic NMR and HPLC studies. When NVOC bullvalenes 1 and 2 were exposed to UV light, the cleavage of the NVOC group resulted in a mixture of static isomers of the corresponding bullvalone. Binding studies of NVOC bisporphyrin bullvalene 1 demonstrated that the dynamic isomeric equilibrium shifted in the presence of C(60), favoring configurations with more favorable binding affinities. Irradiation of a mixture of 1 and C(60) with UV light and isolation of the major static isomer yielded an isomer of bisporphyrin bullvalone with a binding affinity for C(60) that was ∼2 times larger than that of the nonadapted isomer bisporphyrin bullvalone 41.
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Affiliation(s)
- Alexander R Lippert
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
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Topczewski JJ, Kodet JG, Wiemer DF. Exploration of cascade cyclizations terminated by tandem aromatic substitution: total synthesis of (+)-schweinfurthin A. J Org Chem 2011; 76:909-19. [PMID: 21226493 DOI: 10.1021/jo1022102] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The termination of epoxide-initiated cascade cyclizations with a range of "protected" phenols is described. When the protecting group can be lost as a stabilized electrophile, the cascade process continues beyond ring closure to afford products which have undergone a tandem electrophilic aromatic substitution. A number of groups have proven viable in this process and the regiochemistry of their substitution reactions has been studied. Application of this methodology in the first total synthesis of (+)-schweinfurthin A, a potent antiproliferative agent, has been achieved.
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Lee KS. A New Synthesis of Triphenylphosphorane Ylide Precursors to α-Keto Amide/Ester and Tricarbonyl Units via Horner-Wadsworth-Emmons Reaction. B KOREAN CHEM SOC 2010. [DOI: 10.5012/bkcs.2010.31.10.2776] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Topczewski JJ, Neighbors JD, Wiemer DF. Total synthesis of (+)-schweinfurthins B and E. J Org Chem 2010; 74:6965-72. [PMID: 19697910 DOI: 10.1021/jo901161m] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The first total synthesis of (+)-schweinfurthin B, a potent and differentially active cytotoxic agent, has been accomplished. Completion of the synthesis required just 16 steps in the longest linear sequence from commercially available vanillin. Key synthetic transformations included a Shi epoxidation and an efficient cascade cyclization initiated by treatment of the resulting epoxide with BF(3).OEt(2). Furthermore, use of a methyl ether as a stable protecting group for benzylic alcohols dramatically increased the efficiency of the overall sequence. The benzylic ether can be removed from this electron-rich aromatic system through oxidation with DDQ that provided the desired aldehyde intermediate in quantitative yield and shortened the synthetic sequence. Introduction of the A-ring diol in the required cis stereochemistry then became viable through a short sequence highlighted by an aldol condensation with benzaldehyde to introduce an olefin as a latent carbonyl group at the C-3 position. This synthesis established for the first time the absolute stereochemistry of the natural product, and provides access to material on a scale that will advance biological studies. The total synthesis of the closely related compound (+)-schweinfurthin E also is reported.
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Filimonov VD, Yusubov MS, Chi KV. Oxidative methods in the synthesis of vicinal di- and polycarbonyl compounds. RUSSIAN CHEMICAL REVIEWS 2007. [DOI: 10.1070/rc1998v067n09abeh000396] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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12
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Gao P, Liu Y, Zhang L, Xu PF, Wang S, Lu Y, He M, Zhai H. Total Synthesis of Indole Alkaloid (±)-Subincanadine F via SmI2-Mediated Ring Opening and Bridge-Forming Mannich Reaction. J Org Chem 2006; 71:9495-8. [PMID: 17137380 DOI: 10.1021/jo061724h] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The first total synthesis of (+/-)-subincanadine F, a bioactive indole alkaloid structurally featuring a 1-azabicyclo[4.3.1]decane unit, has been realized from 1-(para-methoxybenzyl)tryptamine in six steps. The bridge-containing tetracyclic framework of subincanadine F was efficiently assembled by a SmI2-mediated ring opening followed by an acid-mediated Mannich reaction. In addition, the tetracyclic ketoester 6, a key intermediate potentially useful for synthesizing structurally related indole alkaloids as well, was obtained in one step from alpha,beta-diketoester 5.
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Affiliation(s)
- Peng Gao
- Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, China 200032
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Deiters A, Pettersson M, Martin SF. General Strategy for the Syntheses of Corynanthe, Tacaman, and Oxindole Alkaloids. J Org Chem 2006; 71:6547-61. [PMID: 16901143 DOI: 10.1021/jo061032t] [Citation(s) in RCA: 97] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report herein the total synthesis of the corynanthe alkaloid dihydrocorynantheol and the formal syntheses of the indole alkaloids tacamonine, rhynchophylline, and hirsutine. The strategies for assembling the corynanthe and tacaman skeletal frameworks comprised of both the classical ABD --> ABCD and ABC --> ABCD approaches wherein the variously substituted piperidinone D-rings were formed via ring-closing metathesis (RCM) followed by a 1,4-addition to introduce the requisite side chain at C(15). Since 1,4-additions to alpha,beta-unsaturated lactams represent an underdeveloped field, we conducted a series of studies with two unsaturated lactams employing organocuprates and metal enolates as the nucleophiles. These studies revealed that organocuprates derived from Grignard reagents and either stoichiometric amounts of CuCN or catalytic amounts of CuBr.DMS complex are excellent nucleophiles for such additions; TMSCl was a crucial additive for optimizing these reactions. The anion derived from ethyl 1,3-dithiolane-2-carboxylate was also an excellent nucleophile in these 1,4-additions, although the stereochemistry of such 1,4-additions to carboline-derived, unsaturated lactams was sensitive to substitution on the indole nitrogen atom. The ABD --> ABCD approach to these alkaloids featured a novel one-pot sequence of an RCM reaction and a zirconocene-catalyzed carbomagnesation followed by a second RCM to generate the D-ring.
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Affiliation(s)
- Alexander Deiters
- Department of Chemistry and Biochemistry, University of Texas, Austin, Texas 78712, USA
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Wasserman HH, Long YO, Parr J. α,β-Diketo nitriles as dielectrophiles. Formation of heterocyclic derivatives of amino acids. Tetrahedron Lett 2003. [DOI: 10.1016/s0040-4039(02)02486-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Lee K, Im JM. A practical procedure for the selective oxidation of phosphorus keto ylides to vicinal tricarbonyls using moist magnesium monoperoxyphthalate (MMPP) in dichloromethane at ambient temperature. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(00)02280-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Abstract
[equation--see text] The photooxidation of cyclic allenes gives rise to cyclic 1,2, 3-trione hydrates. The formation of these compounds points to a novel photooxidation mechanism involving both singlet and triplet oxygen. Upon placement of a methyl group on the allene, the mechanism shifts to predominantly an "ene" reaction. The corresponding cycloadditions with 4-methyl-1,3,4-triazoline-3, 5-dione (MTAD) with cyclic allenes involve 2 equiv of MTAD. The dipolar intermediates are trapped with H(2)O to give alpha-urazole-substituted 2-cycloalkenones.
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Affiliation(s)
- I Erden
- San Francisco State University, Department of Chemistry and Biochemistry, San Francisco, California 94132, USA.
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Affiliation(s)
- M B Rubin
- Department of Chemistry, Technion-Israel Institute of Technology, Haifa, Israel, and Organisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany
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The synthesis and investigation of the DNA binding properties of dielectrophiles incorporating bis-vicinal tricarbonyls. Bioorg Med Chem Lett 1995. [DOI: 10.1016/0960-894x(95)00521-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Coats SJ, Wasserman HH. The conversion of α-bromo-β-dicarbonyls to vicinal tricarbonyls using dimethyldioxirane and base. Tetrahedron Lett 1995. [DOI: 10.1016/0040-4039(95)01576-4] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Aitken RA, Cadogan JIG, Gosney I. CONVENIENT PREPARATION OF UNSYMMETRICALLY SUBSTITUTED BENZILS BY PERMANGANATE OXIDATION OF β-OXO PHOSPHORUS YLIDES. PHOSPHORUS SULFUR 1995. [DOI: 10.1080/10426509508042528] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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