1
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Li K, Sun X, Zhao S, Li T, Zha Z, Wang Z. Zn-Catalyzed enantioselective allylation and allenylation of isatins by virtue of a proline-derived chiral ligand. Chem Commun (Camb) 2022; 58:2156-2159. [PMID: 35060568 DOI: 10.1039/d1cc06563g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
An asymmetric allylation and allenylation of isatins with facile organoboron reagents was developed under the catalysis of a Lewis acid. A series of optically pure 3-allyl-3-hydroxyoxindoles and 3-allenyl-3-hydroxyoxindoles can be obtained in excellent yields (up to 99% yield) and high enantioselectivities (up to 97% ee). The possible transition state was supported by DFT calculation and the corresponding mechanism was proposed. A gram scale experiment and further functionalization of these chiral 3-hydroxyoxindoles are established.
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Affiliation(s)
- Kuiliang Li
- Hefei National Laboratory for Physical Sciences at Microscale, CAS Key Laboratory of Soft Matter Chemistry & Center for Excellence in Molecular Synthesis of Chinese Academy of Sciences, Collaborative Innovation Center of Suzhou Nano Science and Technology & School of Chemistry and Materials Science in University of Science and Technology of China, Hefei, 230026, P. R. China.
| | - Xiang Sun
- Hefei National Laboratory for Physical Sciences at Microscale, CAS Key Laboratory of Soft Matter Chemistry & Center for Excellence in Molecular Synthesis of Chinese Academy of Sciences, Collaborative Innovation Center of Suzhou Nano Science and Technology & School of Chemistry and Materials Science in University of Science and Technology of China, Hefei, 230026, P. R. China.
| | - Shuangshuang Zhao
- Hefei National Laboratory for Physical Sciences at Microscale, CAS Key Laboratory of Soft Matter Chemistry & Center for Excellence in Molecular Synthesis of Chinese Academy of Sciences, Collaborative Innovation Center of Suzhou Nano Science and Technology & School of Chemistry and Materials Science in University of Science and Technology of China, Hefei, 230026, P. R. China.
| | - Tong Li
- Hefei National Laboratory for Physical Sciences at Microscale, CAS Key Laboratory of Soft Matter Chemistry & Center for Excellence in Molecular Synthesis of Chinese Academy of Sciences, Collaborative Innovation Center of Suzhou Nano Science and Technology & School of Chemistry and Materials Science in University of Science and Technology of China, Hefei, 230026, P. R. China.
| | - Zhenggen Zha
- Hefei National Laboratory for Physical Sciences at Microscale, CAS Key Laboratory of Soft Matter Chemistry & Center for Excellence in Molecular Synthesis of Chinese Academy of Sciences, Collaborative Innovation Center of Suzhou Nano Science and Technology & School of Chemistry and Materials Science in University of Science and Technology of China, Hefei, 230026, P. R. China.
| | - Zhiyong Wang
- Hefei National Laboratory for Physical Sciences at Microscale, CAS Key Laboratory of Soft Matter Chemistry & Center for Excellence in Molecular Synthesis of Chinese Academy of Sciences, Collaborative Innovation Center of Suzhou Nano Science and Technology & School of Chemistry and Materials Science in University of Science and Technology of China, Hefei, 230026, P. R. China.
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2
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Mondal B, Roy UK. Making and breaking of Zn–C bonds in the cases of allyl and propargyl organozincs. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.132169] [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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3
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Takahashi K, Matsui M, Kuse M, Takikawa H. First synthesis of (S)-(+)-hymenoic acid, a DNA polymerase λ inhibitor isolated from Hymenochaetaceae sp. Biosci Biotechnol Biochem 2018; 82:42-45. [DOI: 10.1080/09168451.2017.1406302] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Abstract
Hymenoic acid, isolated from cultures of the fungus, Hymenochaetaceae sp., is a specific inhibitor of DNA polymerase λ. The first synthesis of (S)-(+)-hymenoic acid was achieved by starting from trans-1,4-cyclohexanedimethanol and methyl (R)-(−)-3-hydroxyisobutyrate, and Julia–Kocienski olefination was employed as the key step.
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Affiliation(s)
- Kensuke Takahashi
- Department of Agrobioscience, Graduate School of Agricultural Science, Kobe University, Kobe, Japan
| | - Miki Matsui
- Department of Agrobioscience, Graduate School of Agricultural Science, Kobe University, Kobe, Japan
| | - Masaki Kuse
- Department of Agrobioscience, Graduate School of Agricultural Science, Kobe University, Kobe, Japan
| | - Hirosato Takikawa
- Department of Agrobioscience, Graduate School of Agricultural Science, Kobe University, Kobe, Japan
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4
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Dakarapu US, Bokka A, Asgari P, Trog G, Hua Y, Nguyen HH, Rahman N, Jeon J. Lewis Base Activation of Silyl Acetals: Iridium-Catalyzed Reductive Horner–Wadsworth–Emmons Olefination. Org Lett 2015; 17:5792-5. [DOI: 10.1021/acs.orglett.5b02901] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Udaya Sree Dakarapu
- Department
of Chemistry and
Biochemistry, University of Texas at Arlington, Arlington, Texas 76019, United States
| | - Apparao Bokka
- Department
of Chemistry and
Biochemistry, University of Texas at Arlington, Arlington, Texas 76019, United States
| | - Parham Asgari
- Department
of Chemistry and
Biochemistry, University of Texas at Arlington, Arlington, Texas 76019, United States
| | - Gabriela Trog
- Department
of Chemistry and
Biochemistry, University of Texas at Arlington, Arlington, Texas 76019, United States
| | - Yuanda Hua
- Department
of Chemistry and
Biochemistry, University of Texas at Arlington, Arlington, Texas 76019, United States
| | - Hiep H. Nguyen
- Department
of Chemistry and
Biochemistry, University of Texas at Arlington, Arlington, Texas 76019, United States
| | - Nawal Rahman
- Department
of Chemistry and
Biochemistry, University of Texas at Arlington, Arlington, Texas 76019, United States
| | - Junha Jeon
- Department
of Chemistry and
Biochemistry, University of Texas at Arlington, Arlington, Texas 76019, United States
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5
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Williams BD, Smith AB. Total synthesis of (+)-18-epi-latrunculol A: development of a synthetic route. J Org Chem 2014; 79:9284-96. [PMID: 25243951 PMCID: PMC4184459 DOI: 10.1021/jo501733m] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
![]()
The
evolution of an enantioselective total synthesis of (+)-18-epi-latrunculol A, a congener of the marine-sponge-derived
latrunculins A and B, is reported. Key steps include a late-stage
Mitsunobu macrolactonization to construct the 16-membered macrolactone,
a mild Carreira alkynylation to unite the northern and southern hemispheres,
a diastereoselective, acid-mediated δ-hydroxy enone cyclization/equilibration
sequence, and a functional-group-tolerant cross-metathesis to access
the enone cyclization precursor.
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Affiliation(s)
- Brett D Williams
- Department of Chemistry, Laboratory for Research on the Structure of Matter, and Monell Chemical Senses Center, University of Pennsylvania , Philadelphia, Pennsylvania 19104, United States
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6
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Miyazawa M, Eizawa T, Yoshihara S, Hatanaka A, Yokoyama H, Hirai Y. Novel stereoselective synthesis of spiroketal structure using Pd(II)-catalyst. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2013.12.015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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7
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Kaviani-Joupari M, Schramm MP. Preparation of enantioenriched tetraols and triolamines from a common epoxide. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.07.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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8
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Abstract
An enantioselective total synthesis of the cytotoxic latrunculin congener (+)-18-epi-latrunculol A has been achieved. Key steps in the synthetic route include an acid-mediated enone cyclization/equilibration sequence, a Carreira alkynylation, and a late-stage Mitsunobu macrolactonization to construct the macrolide skeleton.
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Affiliation(s)
- Brett D Williams
- Department of Chemistry, Laboratory for Research on the Structure of Matter and Monell Chemical Senses Center, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
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9
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Yus M, González-Gómez JC, Foubelo F. Diastereoselective Allylation of Carbonyl Compounds and Imines: Application to the Synthesis of Natural Products. Chem Rev 2013; 113:5595-698. [DOI: 10.1021/cr400008h] [Citation(s) in RCA: 398] [Impact Index Per Article: 36.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Miguel Yus
- Departamento de Química
Orgánica, Facultad
de Ciencias and Instituto de Síntesis Orgánica (ISO), Universidad de Alicante, Apdo. 99, 03080 Alicante,
Spain
| | - José C. González-Gómez
- Departamento de Química
Orgánica, Facultad
de Ciencias and Instituto de Síntesis Orgánica (ISO), Universidad de Alicante, Apdo. 99, 03080 Alicante,
Spain
| | - Francisco Foubelo
- Departamento de Química
Orgánica, Facultad
de Ciencias and Instituto de Síntesis Orgánica (ISO), Universidad de Alicante, Apdo. 99, 03080 Alicante,
Spain
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10
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García-Muñoz MJ, Zacconi F, Foubelo F, Yus M. Indium-Promoted Diastereo- and Regioselective Propargylation of Chiral Sulfinylimines. European J Org Chem 2013. [DOI: 10.1002/ejoc.201201410] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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11
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Wong GW, Landis CR. Iterative Asymmetric Hydroformylation/Wittig Olefination Sequence. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201208819] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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12
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Wong GW, Landis CR. Iterative Asymmetric Hydroformylation/Wittig Olefination Sequence. Angew Chem Int Ed Engl 2013; 52:1564-7. [PMID: 23283707 DOI: 10.1002/anie.201208819] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2012] [Revised: 11/29/2012] [Indexed: 11/10/2022]
Affiliation(s)
- Gene W Wong
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, WI 53706, USA
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13
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Abstract
A Veratrum piperidine chiron was prepared over 11 steps (7.9% yield) from (-)-citronellal. Three methods for the installation of the propargylic side chain onto a cyclic enamide are presented.
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Affiliation(s)
- Douglass F Taber
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, USA.
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14
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Fandrick DR, Saha J, Fandrick KR, Sanyal S, Ogikubo J, Lee H, Roschangar F, Song JJ, Senanayake CH. Zinc-catalyzed allenylations of aldehydes and ketones. Org Lett 2011; 13:5616-9. [PMID: 21942658 DOI: 10.1021/ol202343c] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The general zinc-catalyzed allenylation of aldehydes and ketones with an allenyl boronate is presented. Preliminary mechanistic studies support a kinetically controlled process wherein, after a site-selective B/Zn exchange to generate a propargyl zinc intermediate, the addition to the electrophile effectively competes with propargyl-allenyl zinc equilibration. The utility of the methodology was demonstrated by application to a rhodium-catalyzed [4+2] cycloaddition.
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Affiliation(s)
- Daniel R Fandrick
- Chemical Development, Boehringer-Ingelheim Pharmaceuticals Inc., 900 Ridgebury Road, P.O. BOX 368, Ridgefield, Connecticut 06877-0368, USA.
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15
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Fandrick DR, Johnson CS, Fandrick KR, Reeves JT, Tan Z, Lee H, Song JJ, Yee NK, Senanayake CH. Highly Diastereoselective Zinc-Catalyzed Propargylation of tert-Butanesulfinyl Imines. Org Lett 2010; 12:748-51. [DOI: 10.1021/ol9028258] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Daniel R. Fandrick
- Department of Chemical Development, Boehringer Ingelheim Pharmaceuticals, Inc., 900 Old Ridgebury Road/P.O. Box 368, Ridgefield, Connecticut 06877-0368
| | - Courtney S. Johnson
- Department of Chemical Development, Boehringer Ingelheim Pharmaceuticals, Inc., 900 Old Ridgebury Road/P.O. Box 368, Ridgefield, Connecticut 06877-0368
| | - Keith R. Fandrick
- Department of Chemical Development, Boehringer Ingelheim Pharmaceuticals, Inc., 900 Old Ridgebury Road/P.O. Box 368, Ridgefield, Connecticut 06877-0368
| | - Jonathan T. Reeves
- Department of Chemical Development, Boehringer Ingelheim Pharmaceuticals, Inc., 900 Old Ridgebury Road/P.O. Box 368, Ridgefield, Connecticut 06877-0368
| | - Zhulin Tan
- Department of Chemical Development, Boehringer Ingelheim Pharmaceuticals, Inc., 900 Old Ridgebury Road/P.O. Box 368, Ridgefield, Connecticut 06877-0368
| | - Heewon Lee
- Department of Chemical Development, Boehringer Ingelheim Pharmaceuticals, Inc., 900 Old Ridgebury Road/P.O. Box 368, Ridgefield, Connecticut 06877-0368
| | - Jinhua J. Song
- Department of Chemical Development, Boehringer Ingelheim Pharmaceuticals, Inc., 900 Old Ridgebury Road/P.O. Box 368, Ridgefield, Connecticut 06877-0368
| | - Nathan K. Yee
- Department of Chemical Development, Boehringer Ingelheim Pharmaceuticals, Inc., 900 Old Ridgebury Road/P.O. Box 368, Ridgefield, Connecticut 06877-0368
| | - Chris H. Senanayake
- Department of Chemical Development, Boehringer Ingelheim Pharmaceuticals, Inc., 900 Old Ridgebury Road/P.O. Box 368, Ridgefield, Connecticut 06877-0368
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16
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Xiao ZJ, Zong MH, Lou WY. Highly enantioselective reduction of 4-(trimethylsilyl)-3-butyn-2-one to enantiopure (R)-4-(trimethylsilyl)-3-butyn-2-ol using a novel strain Acetobacter sp. CCTCC M209061. BIORESOURCE TECHNOLOGY 2009; 100:5560-5565. [PMID: 19564106 DOI: 10.1016/j.biortech.2009.06.006] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2009] [Revised: 05/31/2009] [Accepted: 06/02/2009] [Indexed: 05/28/2023]
Abstract
The biocatalytic reduction of 4-(trimethylsilyl)-3-butyn-2-one to enantiopure (R)-4-(trimethylsilyl)-3-butyn-2-ol was successfully conducted with high enantioselectivity using immobilized whole cells of a novel strain Acetobacter sp. CCTCC M209061, newly isolated from kefir. Compared with other microorganisms that were investigated, Acetobacter sp. CCTCC M209061 was shown to be more effective for the bioreduction reaction, and afforded much higher yield and product enantiomeric excess (e.e.). The optimal buffer pH, co-substrate concentration, reaction temperature, substrate concentration and shaking rate were 5.0, 130.6 mM, 30 degrees C, 6.0 mM and 180 r/min, respectively. Under the optimized conditions, the maximum yield and the product e.e. were 71% and >99%, respectively, which are much higher than those reported previously. Additionally, the established biocatalytic system proved to be efficient for the bioreduction of acetyltrimethylsilane to (R)-1-trimethylsilylethanol with excellent yield and product e.e. The immobilized cells manifested a good operational stability under the above reaction conditions since they retained 70% of their catalytic activity after ten cycles of use.
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Affiliation(s)
- Zi-Jun Xiao
- State Key Laboratory of Pulp and Paper Engineering, College of Light Industry and Food Sciences, South China University of Technology, Guangzhou 510640, China
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17
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Fandrick DR, Fandrick KR, Reeves JT, Tan Z, Johnson CS, Lee H, Song JJ, Yee NK, Senanayake CH. Zinc Catalyzed and Mediated Propargylations with Propargyl Boronates. Org Lett 2009; 12:88-91. [DOI: 10.1021/ol902457m] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Daniel R. Fandrick
- Department of Chemical Development, Boehringer Ingelheim Pharmaceuticals Inc., 900 Old Ridgebury Road/P.O. Box 368, Ridgefield, Connecticut 06877-0368
| | - Keith R. Fandrick
- Department of Chemical Development, Boehringer Ingelheim Pharmaceuticals Inc., 900 Old Ridgebury Road/P.O. Box 368, Ridgefield, Connecticut 06877-0368
| | - Jonathan T. Reeves
- Department of Chemical Development, Boehringer Ingelheim Pharmaceuticals Inc., 900 Old Ridgebury Road/P.O. Box 368, Ridgefield, Connecticut 06877-0368
| | - Zhulin Tan
- Department of Chemical Development, Boehringer Ingelheim Pharmaceuticals Inc., 900 Old Ridgebury Road/P.O. Box 368, Ridgefield, Connecticut 06877-0368
| | - Courtney S. Johnson
- Department of Chemical Development, Boehringer Ingelheim Pharmaceuticals Inc., 900 Old Ridgebury Road/P.O. Box 368, Ridgefield, Connecticut 06877-0368
| | - Heewon Lee
- Department of Chemical Development, Boehringer Ingelheim Pharmaceuticals Inc., 900 Old Ridgebury Road/P.O. Box 368, Ridgefield, Connecticut 06877-0368
| | - Jinhua J. Song
- Department of Chemical Development, Boehringer Ingelheim Pharmaceuticals Inc., 900 Old Ridgebury Road/P.O. Box 368, Ridgefield, Connecticut 06877-0368
| | - Nathan K. Yee
- Department of Chemical Development, Boehringer Ingelheim Pharmaceuticals Inc., 900 Old Ridgebury Road/P.O. Box 368, Ridgefield, Connecticut 06877-0368
| | - Chris H. Senanayake
- Department of Chemical Development, Boehringer Ingelheim Pharmaceuticals Inc., 900 Old Ridgebury Road/P.O. Box 368, Ridgefield, Connecticut 06877-0368
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18
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Casas-Arce E, ter Horst B, Feringa B, Minnaard A. Asymmetric Total Synthesis of PDIM A: A Virulence Factor ofMycobacterium tuberculosis. Chemistry 2008; 14:4157-9. [DOI: 10.1002/chem.200800243] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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19
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Stewart-Knox BJ, Simpson EEA, Parr H, Rae G, Polito A, Intorre F, Andriollo Sanchez M, Meunier N, O'Connor JM, Maiani G, Coudray C, Strain JJ. Taste acuity in response to zinc supplementation in older Europeans. Br J Nutr 2007; 99:129-36. [PMID: 17651517 DOI: 10.1017/s0007114507781485] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Taste acuity declines with age and may be dependent upon Zn status. The aim of the present double-blind, randomised controlled intervention trial has been to determine taste acuity in response to Zn supplementation (placebo, or 15 or 30 mg Zn/d). Healthy older European adults aged 70–87 years were recruited within Italy (Rome) (n 108) and France (Grenoble) (n 91) to the European Commission-funded Zenith project. A signal detection theory approach was adopted for taste assessment. The data were converted to R indices and analysed by repeated-measures ANOVA controlling for baseline taste acuity as well as serum and erythrocyte Zn. Serum Zn increased post-intervention, indicating compliance with the intervention. Results differed across geographical region. Salt taste acuity was greater in response to Zn (30 mg) than placebo post-intervention among those recruited in Grenoble. There was no apparent change in acuity for sweet, sour or bitter taste in response to Zn. Supplemented Zn may have potential to enhance salt taste acuity in those over the age of 70 years. Further research is required to determine if enhanced salt taste acuity is reflected in the eating experiences of older individuals.
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Affiliation(s)
- Barbara J Stewart-Knox
- Northern Ireland Centre for Food and Health, University of Ulster, Coleraine BT52 1SA, UK.
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21
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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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22
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Gais HJ. Development of new methods for asymmetric synthesis based on sulfoximines. HETEROATOM CHEMISTRY 2007. [DOI: 10.1002/hc.20331] [Citation(s) in RCA: 108] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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23
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Nicolaou KC, Schlawe D, Kim DW, Longbottom DA, de Noronha RG, Lizos DE, Manam RR, Faulkner DJ. Total synthesis of halipeptins: isolation of halipeptin D and synthesis of oxazoline halipeptin analogues. Chemistry 2006; 11:6197-211. [PMID: 16075448 DOI: 10.1002/chem.200500624] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The isolation from the marine sponge Leiosella cf. arenifibrosa and structural elucidation of halipeptin D (5), a relative of the previously isolated halipeptins A-C (1-3), is described along with the total synthesis of a number of oxazoline analogues (7 a-d and epi-7 c-d). The developed synthetic strategy provides a flexible entry into the various isomers of the polyketide domain of the halipeptins and improvises for a late stage construction of the oxazoline ring after a macrolactamization process which secures the required macrocycle.
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Affiliation(s)
- K C Nicolaou
- Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037, USA
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24
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Goubert M, Canet I, Sinibaldi ME. An Expedient Route to New Spiroheterocycles: Synthesis and Structural Studies. European J Org Chem 2006. [DOI: 10.1002/ejoc.200600448] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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25
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Marshall JA, Eidam P, Eidam HS. (R)- and (S)-4-TIPS-3-butyn-2-ol. Useful Precursors of Chiral Allenylzinc and Indium Reagents. J Org Chem 2006; 71:4840-4. [PMID: 16776511 DOI: 10.1021/jo060542k] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A convenient route to the enantiomers of 4-TIPS-3-butyn-2-ol of >95% enantiomeric purity by reduction of the ynone precursor 4 with the Noyori N-tosyl-1,2-diphenylethylenediamineruthenium cymene catalyst is described. The mesylate derivative of the (S) enantiomer (1c) is converted in situ to an allenylzinc or indium reagent in the presence of a catalyst derived from Pd(OAc)2 and Ph3P and either Et2Zn or InI. A second in situ addition of these reagents to aldehydes leads to anti homopropargylic alcohol adducts. The additions proceed in generally high (60-90%) yield with modest to excellent diastereoselectivity and high enantioselectivity. Only slight mismatching (<5%) is observed with chiral alpha-methyl and alpha-silyloxy aldehydes. Additions to alpha-substituted enals are highly diastereoselective, while beta,beta-disubstituted enals afford ca. 2:1 mixtures of anti and syn adducts.
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Affiliation(s)
- James A Marshall
- Department of Chemistry, University of Virginia, McCormick Road, P.O. Box 400319, Charlottesville, Virginia 22904-4319, USA.
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26
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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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27
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Hyland CJT, Hegedus LS. Boron-Mediated Stereoselective Syntheses of γ,γ-Disubstituted Allenamides. J Org Chem 2005; 70:8628-30. [PMID: 16209626 DOI: 10.1021/jo051385c] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Propargylic boranes generated by lithiation of optically active N-propargyloxazolidinones undergo reaction with a range of aldehydes to produce gamma,gamma-disubstituted allenamides with good diastereoselectivity.
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Schwartz BD, Hayes PY, Kitching W, De Voss JJ. Flexible Synthesis of Enantiomerically Pure 2,8-Dialkyl-1,7-dioxaspiro[5.5]undecanes and 2,7-Dialkyl-1,6-dioxaspiro[4.5]decanes from Propargylic and Homopropargylic Alcohols. J Org Chem 2005; 70:3054-65. [PMID: 15822964 DOI: 10.1021/jo0477547] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A new approach to enantiomerically pure 2,8-dialkyl-1,7-dioxaspiro[5.5]undecanes and 2,7-dialkyl-1,6-dioxaspiro[4.5]decanes is described and utilizes enantiomerically pure homopropargylic alcohols obtained from lithium acetylide opening of enantiomerically pure epoxides, which are, in turn, acquired by hydrolytic kinetic resolution of the corresponding racemic epoxides. Alkyne carboxylation and conversion to the Weinreb amide may be followed by triple-bond manipulation prior to reaction with a second alkynyllithium derived from a homo- or propargylic alcohol. In this way, the two ring components of the spiroacetal are individually constructed, with deprotection and cyclization affording the spiroacetal. The procedure is illustrated by acquisition of (2S,5R,7S) and (2R,5R,7S)-2-n-butyl-7-methyl-1,6-dioxaspiro[4.5]-decanes (1), (2S,6R,8S)-2-methyl-8-n-pentyl-1,7-dioxaspiro[5.5]undecane (2), and (2S,6R,8S)-2-methyl-8-n-propyl-1,7-dioxaspiro[5.5]undecane (3). The widely distributed insect component, (2S,6R,8S)-2,8-dimethyl-1,7-dioxaspiro[5.5]undecane (4), was acquired by linking two identical alkyne precursors via ethyl formate. In addition, [(2)H(4)]-regioisomers, 10,10,11,11-[(2)H(4)] and 4,4,5,5-[(2)H(4)] of 3 and 4,4,5,5-[(2)H(4)]-4, were acquired by triple-bond deuteration, using deuterium gas and Wilkinson's catalyst. This alkyne-based approach is, in principle, applicable to more complex spiroacetal systems not only by use of more elaborate alkynes but also by triple-bond functionalization during the general sequence.
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Affiliation(s)
- Brett D Schwartz
- School of Molecular and Microbial Sciences, Department of Chemistry, The University of Queensland, Brisbane, Australia 4072
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O'Neil GW, Phillips AJ. Titanium(II)-mediated cyclization of (silyloxy)enynes: a synthesis of the C9–C19 subunit of dictyostatin-1. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2004.04.018] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Ranslow PBD, Hegedus LS, de los Rios C. Syntheses and Reactions of Optically Active α-Aminoallenylstannanes. J Org Chem 2003; 69:105-11. [PMID: 14703385 DOI: 10.1021/jo0302861] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Lithiation/stannylation of optically active N-propargyloxazolidinones produced optically active alpha-oxazolidinonylallenylstannanes. Reaction of these with aldehydes in the presence of BF(3).OEt(2) produced beta-hydroxypropargylamines with high syn diastereoselectivity and ee. These were converted to gamma-hydroxy-beta-amino acids by oxidative cleavage of the alkyne.
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Affiliation(s)
- Peter B D Ranslow
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, 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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Synthesis and glycosidase inhibitory activity of enantiopure polyhydroxylated octahydroindoles and decahydroquinolines, analogs to castanospermine. Tetrahedron 2003. [DOI: 10.1016/j.tet.2003.09.044] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Abstract
A total synthesis of the cytotoxic polyketide marine natural product callystatin A is described. The route features chiral allenylmetal additions to construct the polypropionate C15-22 segment and an sp(2)-sp(3) Suzuki coupling to join the C1-C11 and C12-C22 subunits.
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Affiliation(s)
- James A Marshall
- Department of Chemistry, University of Virginia, Charlottesville, Virginia 22904, USA.
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Marshall JA, Adams ND. Total synthesis of bafilomycin V(1): a methanolysis product of the macrolide bafilomycin C(2). J Org Chem 2002; 67:733-40. [PMID: 11856013 DOI: 10.1021/jo015864x] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A synthesis of bafilomycin V(1), a methanolysis product of the macrolide natural product bafilomycin C(2), is described. The route utilizes chiral nonracemic allenylzinc reagents, prepared in situ from propargylic mesylates, to access key segments of this methyl ester. The acetylenic moieties of the derived homopropargylic alcohol adducts play an important role in further elaboration of these subunits. Final assemblage of the 25-carbon chain, containing 12 stereocenters, an alpha-methoxy Z,E 1,3-dienic ester, and an additional E,E 1,3-diene, was achieved through Stille coupling of an acetylene-derived vinyl stannane and vinyl iodide of approximate equal complexity. Attempted cyclization of several C15 hydroxy acid derivatives to the 16-membered lactone bafilomycin A(1), a potent inhibitor of vacuolar ATPases, could not be achieved.
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Affiliation(s)
- James A Marshall
- Department of Chemistry, University of Virginia, McCormick Road, P.O. Box 400319, Charlottesville, Virginia 22904, USA.
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Marshall JA, Chobanian HR, Yanik MM. Lipase-mediated resolution of 4-TMS-3-butyn-2-ol and use of the mesylate derivatives as a precursor to a highly stereoselective chiral allenylindium reagent. Org Lett 2001; 3:3369-72. [PMID: 11594836 DOI: 10.1021/ol016605x] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text]. An improved procedure for the resolution of 4-trimethylsilyl-3-butyn-2-ol has been developed. The mesylate derivatives of the resolved alcohols have been found to undergo highly enantio-, regio-, and diastereoselective additions to aldehydes, leading to homopropargylic alcohol adducts.
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Affiliation(s)
- J A Marshall
- Department of Chemistry, University of Virginia, P.O. Box 400319, Charlottesville, Virginia 22904, USA.
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