1
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Khamkar SL, Handore KL, Shinde HM, Reddy DS. Highly Stereoselective Diels-Alder-Based Strategy for the Synthesis of 3- epi-Formicin A and 1- epi-Formicin B. Org Lett 2024; 26:3961-3965. [PMID: 38679880 DOI: 10.1021/acs.orglett.4c01209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/01/2024]
Abstract
The first enantioselective approach based on a highly stereoselective Diels-Alder reaction for the synthesis of 3-epi-formicin A and 1-epi-formicin B with rare N-acetylcysteamine-containing indenone thioesters is reported. The strategy utilizes a key Diels-Alder reaction to form the core hydrindane system with three contiguous stereocenters in very high levels of diastereo- and regioselectivity and one-pot oxidation/isomerization/dehydrogenation. The scope of this method was tested with different substrates to give cycloadducts in a highly diastereoselective manner.
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Affiliation(s)
- Sunil L Khamkar
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
- BASF Innovation Campus Mumbai, BASF Chemicals India Pvt. Ltd., Plot No. 12, TTC Area Thane Belapur Road, Turbhe, Navi Mumbai 400705, India
| | - Kishor L Handore
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
- Organic Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pune 411008, India
| | - Harish M Shinde
- BASF Innovation Campus Mumbai, BASF Chemicals India Pvt. Ltd., Plot No. 12, TTC Area Thane Belapur Road, Turbhe, Navi Mumbai 400705, India
| | - D Srinivasa Reddy
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
- Department of Organic Synthesis and Process Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
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2
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Hafeman NJ, Chan M, Fulton TJ, Alexy EJ, Loskot SA, Virgil SC, Stoltz BM. Asymmetric Total Synthesis of Havellockate. J Am Chem Soc 2022; 144:20232-20236. [PMID: 36287147 PMCID: PMC9997676 DOI: 10.1021/jacs.2c09583] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The first total synthesis of the furanobutenolide-derived cembranoid diterpenoid havellockate is disclosed. Our convergent strategy employs a Julia-Kocienski olefination to join two enantioenriched fragments to produce a diene that is subsequently used in a propiolic acid esterification/Diels-Alder cascade. This sequence generates the fused carbocyclic core of the natural product in short order. A challenging Zn-mediated Barbier allylation then forges the final C-C bond and also establishes two vicinal stereogenic centers. Finally, a Cu-catalyzed aerobic oxidation facilitates the formation of the β-hydroxybutanolide to complete the total synthesis.
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Affiliation(s)
| | | | | | | | | | | | - Brian M. Stoltz
- The Warren and Katharine Schlinger Laboratory for Chemistry and Chemical Engineering, Division of Chemistry and Chemical Engineering, California Institute of Technology, MC 101-20, Pasadena, California, 91125, United States
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3
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Cheng J, Li YH, Huang J, Yang Z. Total Syntheses of Vicinal Dichloride Monoterpenes Enabled by Aza-Belluš-Claisen Rearrangement. Org Lett 2021; 23:8465-8470. [PMID: 34652926 DOI: 10.1021/acs.orglett.1c03187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Diastereoselective syntheses of syn- and anti-vicinal dihalides were achieved via an aza-Belluš-Claisen rearrangement, which involved the reaction of an α-chloro carboxylic acid chloride with halogen-substituted trans-allyl morpholines in the presence of Lewis acids. The developed method was used for the total synthesis of a group of monoterpene natural products bearing vicinal dichloride subunits.
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Affiliation(s)
- Jiangqun Cheng
- State Key Laboratory of Chemical Oncogenomics and Key Laboratory of Chemical Genomics, Peking University Shenzhen Graduate School, Shenzhen 518055, China
| | - Yuan-He Li
- Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education and Beijing National Laboratory for Molecular Science (BNLMS), Peking University, Beijing 100871, China
| | - Jun Huang
- State Key Laboratory of Chemical Oncogenomics and Key Laboratory of Chemical Genomics, Peking University Shenzhen Graduate School, Shenzhen 518055, China
| | - Zhen Yang
- State Key Laboratory of Chemical Oncogenomics and Key Laboratory of Chemical Genomics, Peking University Shenzhen Graduate School, Shenzhen 518055, China.,Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education and Beijing National Laboratory for Molecular Science (BNLMS), Peking University, Beijing 100871, China
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4
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Andringa RLH, de Kok NAW, Driessen AJM, Minnaard AJ. A Unified Approach for the Total Synthesis of cyclo-Archaeol, iso-Caldarchaeol, Caldarchaeol, and Mycoketide. Angew Chem Int Ed Engl 2021; 60:17497-17503. [PMID: 33929790 PMCID: PMC8362178 DOI: 10.1002/anie.202104759] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Indexed: 12/25/2022]
Abstract
Ir-catalyzed asymmetric alkene hydrogenation is presented as the strategy par excellence to prepare saturated isoprenoids and mycoketides. This highly stereoselective synthesis approach is combined with an established 13 C-NMR method to determine the enantioselectivity of each methyl-branched stereocenter. It is shown that this analysis is fit for purpose and the combination allows the synthesis of the title compounds with a significant increase in efficiency.
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Affiliation(s)
- Ruben L. H. Andringa
- Stratingh Institute for ChemistryUniversity of GroningenNijenborgh 79747 AGGroningenThe Netherlands
| | - Niels A. W. de Kok
- Department of Molecular MicrobiologyUniversity of GroningenNijenborgh 79747 AGGroningenThe Netherlands
| | - Arnold J. M. Driessen
- Department of Molecular MicrobiologyUniversity of GroningenNijenborgh 79747 AGGroningenThe Netherlands
| | - Adriaan J. Minnaard
- Stratingh Institute for ChemistryUniversity of GroningenNijenborgh 79747 AGGroningenThe Netherlands
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5
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Andringa RLH, Kok NAW, Driessen AJM, Minnaard AJ. A Unified Approach for the Total Synthesis of
cyclo
‐Archaeol,
iso
‐Caldarchaeol, Caldarchaeol, and Mycoketide. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202104759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Ruben L. H. Andringa
- Stratingh Institute for Chemistry University of Groningen Nijenborgh 7 9747 AG Groningen The Netherlands
| | - Niels A. W. Kok
- Department of Molecular Microbiology University of Groningen Nijenborgh 7 9747 AG Groningen The Netherlands
| | - Arnold J. M. Driessen
- Department of Molecular Microbiology University of Groningen Nijenborgh 7 9747 AG Groningen The Netherlands
| | - Adriaan J. Minnaard
- Stratingh Institute for Chemistry University of Groningen Nijenborgh 7 9747 AG Groningen The Netherlands
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6
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Ando K, Takama D. Stereoselective Synthesis of Trisubstituted ( Z)-Alkenes from Ketones via the Julia-Kocienski Olefination Using 1-Methyl- and 1- tert-Butyl-1 H-tetrazol-5-yl Alkyl Sulfones. Org Lett 2020; 22:6907-6910. [PMID: 32820934 DOI: 10.1021/acs.orglett.0c02440] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
1-Methyl-1H-tetrazol-5-yl (MT) alkyl sulfones 1b, 3b, and 7b react with various unsymmetrical ketones in the presence of LiHMDS in THF at low temperature to give trisubstituted (Z)-alkenes in good yields stereoselectively (Z/E = 91:9 to 99:1). For sterically less demanding ketones, olefination using t-Bu reagents 1d and 3d generated (Z)-alkenes with higher stereoselectivity (93:7-99:1).
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Affiliation(s)
- Kaori Ando
- Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Yanagido 1-1, Gifu 501-1193, Japan
| | - Daiki Takama
- Department of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Yanagido 1-1, Gifu 501-1193, Japan
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7
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Gössinger E. Chemistry of the Secondary Metabolites of Termites. PROGRESS IN THE CHEMISTRY OF ORGANIC NATURAL PRODUCTS 2019; 109:1-384. [PMID: 31637529 DOI: 10.1007/978-3-030-12858-6_1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Isolation, structure determination, synthesis, and biochemistry of the low-molecular-weight compounds of the secretion of exocrine glands of termites are described, with an emphasis on pheromones and defensive compounds.
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Affiliation(s)
- Edda Gössinger
- Institute of Chemistry, University of Vienna, Vienna, Austria.
- , Mistelbach, Austria.
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8
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Khan HPA, Chakraborty TK. Diversity-Oriented Approach to N-Heterocyclic Compounds from α-Phenyl-β-enamino Ester via a Mitsunobu-Michael Reaction Sequence. J Org Chem 2018; 83:2027-2039. [PMID: 29334224 DOI: 10.1021/acs.joc.7b02962] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Herein we delineate a novel route for the diastereoselective construction of diversely substituted N-heterocyclic ring systems as valuable scaffolds for natural products and pharmaceuticals, starting from an easily accessible prochiral α-phenyl-β-enamino ester. The reaction sequence relies on the unexplored reactivity of α-phenyl-β-enamino ester as a nucleophilic partner in the Mitsunobu reaction to forge the N-tethered alkene-alcohol/thiol/amine intermediate, which was subjected to an intramolecular hetero-Michael addition reaction under mild conditions to furnish the respective N-heterocyclic compounds embedded with an exocyclic chiral center in high yields and excellent diastereoselectivities. The methodology is amenable for a broad range of substrates based on a metal-free approach.
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Affiliation(s)
- Hina P A Khan
- Department of Organic Chemistry, Indian Institute of Science , Bengaluru 560012, India
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9
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Hari Babu M, Ranjith Kumar G, Kant R, Sridhar Reddy M. Ni-Catalyzed regio- and stereoselective addition of arylboronic acids to terminal alkynes with a directing group tether. Chem Commun (Camb) 2017; 53:3894-3897. [DOI: 10.1039/c6cc10256e] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Addition of arylboronic acids to directing group tethered acetylenes in a regio and stereoselective manner using an inexpensive catalytic system is achieved for the first time to access highly sought after allyl/homoallyl alcohol/amine units.
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Affiliation(s)
- Madala Hari Babu
- MPC Division
- CSIR-Central Drug Research Institute
- Lucknow 226031
- India
| | - Gadi Ranjith Kumar
- MPC Division
- CSIR-Central Drug Research Institute
- Lucknow 226031
- India
- Academy of Scientific and Innovative Research
| | - Ruchir Kant
- MSB Division
- CSIR-Central Drug Research Institute
- Lucknow 226031
- India
| | - Maddi Sridhar Reddy
- MPC Division
- CSIR-Central Drug Research Institute
- Lucknow 226031
- India
- Academy of Scientific and Innovative Research
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10
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Lutteke G, Kleinnijenhuis RA, Beuving RJ, de Gelder R, Smits JMM, van Maarseveen JH, Hiemstra H. Enantioselective Approach to the Right-Hand Substructure of Solanoeclepin A. European J Org Chem 2016. [DOI: 10.1002/ejoc.201601094] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Ginger Lutteke
- Van't Hoff Institute for Molecular Sciences; University of Amsterdam; Science Park 904 1098 XH Amsterdam The Netherlands
| | - Roel A. Kleinnijenhuis
- Van't Hoff Institute for Molecular Sciences; University of Amsterdam; Science Park 904 1098 XH Amsterdam The Netherlands
| | - Remmelt J. Beuving
- Van't Hoff Institute for Molecular Sciences; University of Amsterdam; Science Park 904 1098 XH Amsterdam The Netherlands
| | - René de Gelder
- Institute for Molecules and Materials; Radboud University; Heyendaalseweg 135 6525 AJ Nijmegen The Netherlands
| | - Jan M. M. Smits
- Institute for Molecules and Materials; Radboud University; Heyendaalseweg 135 6525 AJ Nijmegen The Netherlands
| | - Jan H. van Maarseveen
- Van't Hoff Institute for Molecular Sciences; University of Amsterdam; Science Park 904 1098 XH Amsterdam The Netherlands
| | - Henk Hiemstra
- Van't Hoff Institute for Molecular Sciences; University of Amsterdam; Science Park 904 1098 XH Amsterdam The Netherlands
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11
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Ali HM, Koza G, Hameed RT, Rowles R, Davies C, Al Dulayymi JR, Gwenin CD, Baird MS. The synthesis of single enantiomers of trans-alkene containing mycolic acids and related sugar esters. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.08.089] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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12
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Kumar JN, Das B. Enantioselective first total synthesis of eujavanoic acid B through organocatalyzed IMDA reaction. RSC Adv 2015. [DOI: 10.1039/c4ra16136j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The first total synthesis of the polyketide eujavanoic acid B has been accomplished using 1,3-propane diol as the starting material and involving Maruoka asymmetric allylation, Julia olefination, HWE olefination and organocatalyzed IMDA reaction as the key steps.
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Affiliation(s)
- Jayprakash Narayan Kumar
- Division of Natural Products Chemistry
- CSIR-Indian Institute of Chemical Technology
- Hyderabad 500 607
- India
| | - Biswanath Das
- Division of Natural Products Chemistry
- CSIR-Indian Institute of Chemical Technology
- Hyderabad 500 607
- India
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13
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Ma Z, Wang X, Wang X, Rodriguez RA, Moore CE, Gao S, Tan X, Ma Y, Rheingold AL, Baran PS, Chen C. Asymmetric syntheses of sceptrin and massadine and evidence for biosynthetic enantiodivergence. Science 2014; 346:219-24. [PMID: 25301624 DOI: 10.1126/science.1255677] [Citation(s) in RCA: 96] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Cycloaddition is an essential tool in chemical synthesis. Instead of using light or heat as a driving force, marine sponges promote cycloaddition with a more versatile but poorly understood mechanism in producing pyrrole-imidazole alkaloids sceptrin, massadine, and ageliferin. Through de novo synthesis of sceptrin and massadine, we show that sponges may use single-electron oxidation as a central mechanism to promote three different types of cycloaddition. Additionally, we provide surprising evidence that, in contrast to previous reports, sceptrin, massadine, and ageliferin have mismatched chirality. Therefore, massadine cannot be an oxidative rearrangement product of sceptrin or ageliferin, as is commonly believed. Taken together, our results demonstrate unconventional chemical approaches to achieving cycloaddition reactions in synthesis and uncover enantiodivergence as a new biosynthetic paradigm for natural products.
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Affiliation(s)
- Zhiqiang Ma
- Department of Biochemistry, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Xiaolei Wang
- Department of Biochemistry, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Xiao Wang
- Department of Biochemistry, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Rodrigo A Rodriguez
- Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Curtis E Moore
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA 92093, USA
| | - Shuanhu Gao
- Department of Biochemistry, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Xianghui Tan
- Department of Biochemistry, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Yuyong Ma
- Department of Biochemistry, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Arnold L Rheingold
- Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA 92093, USA
| | - Phil S Baran
- Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Chuo Chen
- Department of Biochemistry, The University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.
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14
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Srimani D, Leitus G, Ben-David Y, Milstein D. Direct Catalytic Olefination of Alcohols with Sulfones. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201407281] [Citation(s) in RCA: 14] [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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15
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Srimani D, Leitus G, Ben-David Y, Milstein D. Direct Catalytic Olefination of Alcohols with Sulfones. Angew Chem Int Ed Engl 2014; 53:11092-5. [DOI: 10.1002/anie.201407281] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2014] [Indexed: 11/05/2022]
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16
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Lin G, Chang L, Liu Y, Xiang Z, Chen J, Yang Z. Enantioselective Total Syntheses of (+)-Gallocatechin, (−)-Epigallocatechin, and 8-C-Ascorbyl-(−)-epigallocatechin. Chem Asian J 2013; 8:700-4. [DOI: 10.1002/asia.201201168] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2012] [Indexed: 11/07/2022]
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17
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Yang J, Yin W, Liu R, Chu C. Ti(Oi-Pr)4Mediated Olefination between Julia Reagent and Aldehydes under Mild Conditions: Facile Synthesis of Vinyl Sulfones. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.201200466] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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18
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Yadav JS, Sengupta S. The Formal Total Synthesis of FR252921 - An Immunosuppressant. European J Org Chem 2012. [DOI: 10.1002/ejoc.201201097] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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19
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Billard F, Robiette R, Pospíšil J. Julia-Kocienski reaction-based 1,3-diene synthesis: aldehyde-dependent (E,E/E,Z)-selectivity. J Org Chem 2012; 77:6358-64. [PMID: 22764737 DOI: 10.1021/jo300929a] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A new modification of Julia-Kocienski olefination reaction based on the use of cation-specific chelating agents that yields 1,3-dienes with predictable (E/Z)-selectivity on newly created double bond was developed. The influence of the aldehyde structure on reaction (E/Z) selectivity is discussed and rationalized.
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Affiliation(s)
- François Billard
- Institute of Condensed Matter and Nanosciences-Molecules, Solids and Reactivity (IMCN/MOST), Université Catholique de Louvain, Place Louis Pasteur 1, bte L4.01.02, 1348 Louvain-la-Neuve, Belgium
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20
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Du Z, Si C, Li Y, Wang Y, Lu J. Improved synthesis of 5-substituted 1H-tetrazoles via the [3+2] cycloaddition of nitriles and sodium azide catalyzed by silica sulfuric acid. Int J Mol Sci 2012; 13:4696-4703. [PMID: 22606004 PMCID: PMC3344240 DOI: 10.3390/ijms13044696] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2012] [Revised: 03/19/2012] [Accepted: 03/30/2012] [Indexed: 11/18/2022] Open
Abstract
A silica supported sulfuric acid catalyzed [3+2] cycloaddition of nitriles and sodium azide to form 5-substituted 1H-tetrazoles is described. The protocol can provide a series of 5-substituted 1H-tetrazoles using silica sulfuric acid from nitriles and sodium azide in DMF in 72%–95% yield.
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Affiliation(s)
- Zhenting Du
- College of Science, Northwest A & F University, Yangling, Shaanxi 712100, China; E-Mails: (C.S.); (Y.L.); (Y.W.); (J.L.)
- Key Laboratory of Protection and Utilization of Biological Resources in Tarim Basin, Talimu University, Alaer, Xinjiang 843300, China
- Author to whom correspondence should be addressed; E-Mail: ; Tel./Fax: +86-29-87092226
| | - Changmei Si
- College of Science, Northwest A & F University, Yangling, Shaanxi 712100, China; E-Mails: (C.S.); (Y.L.); (Y.W.); (J.L.)
| | - Youqiang Li
- College of Science, Northwest A & F University, Yangling, Shaanxi 712100, China; E-Mails: (C.S.); (Y.L.); (Y.W.); (J.L.)
| | - Yin Wang
- College of Science, Northwest A & F University, Yangling, Shaanxi 712100, China; E-Mails: (C.S.); (Y.L.); (Y.W.); (J.L.)
| | - Jing Lu
- College of Science, Northwest A & F University, Yangling, Shaanxi 712100, China; E-Mails: (C.S.); (Y.L.); (Y.W.); (J.L.)
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21
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Stang EM, White MC. Molecular complexity via C-H activation: a dehydrogenative Diels-Alder reaction. J Am Chem Soc 2011; 133:14892-5. [PMID: 21842902 PMCID: PMC3292869 DOI: 10.1021/ja2059704] [Citation(s) in RCA: 132] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Traditionally, C-H oxidation reactions install oxidized functionality onto a preformed molecular skeleton, resulting in a local molecular change. The use of C-H activation chemistry to construct complex molecular scaffolds is a new area with tremendous potential in synthesis. We report a Pd(II)/bis-sulfoxide-catalyzed dehydrogenative Diels-Alder reaction that converts simple terminal olefins into complex cycloadducts in a single operation.
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Affiliation(s)
- Erik M Stang
- Roger Adams Laboratory, Department of Chemistry, University of Illinois, Urbana, Illinois 61801, United States
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22
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Synthesis and evaluation of cardiac glycoside mimics as potential anticancer drugs. Bioorg Med Chem 2011; 19:2407-17. [PMID: 21421322 DOI: 10.1016/j.bmc.2011.02.016] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2010] [Revised: 02/04/2011] [Accepted: 02/09/2011] [Indexed: 11/23/2022]
Abstract
The cardiac glycoside digitoxin, consisting of a steroid core linked to a labile trisaccharide, has been used for centuries for the treatment of congestive heart failure. The well known pharmacological effect is a result of the ability of cardiac glycosides to inhibit the Na(+), K(+)-ATPase. Within recent years cardiac glycosides have furthermore been suggested to possess valuable anticancer activity. To mimic the labile trisaccharide of digitoxin with a stabile carbohydrate surrogate, we have used sulfur linked ethylene glycol moieties of varying length (mono-, di-, tri- or tetra-ethylene glycol), and furthermore used these linkers as handles for the synthesis of bivalent steroids. The prepared compounds were evaluated for their potencies to inhibit the Na(+), K(+)-ATPase and for their cytotoxic effect on cancerous MCF-7 cells. A clear trend is observed in both inhibition and cytotoxic effect, where the bioactivity decreases as the size increases. The most potent Na(+), K(+)-ATPase inhibitors are the compounds with the shortest ethylene glycol chain (K(app) 0.48 μM) and thiodigitoxigenin (K(app) 0.42 μM), which both are comparable with digitoxigenin (K(app) 0.52 μM). For the cancer cell viability assay the shortest mimics were found to have highest efficacy, with the best ligand having a monoethylene glycol unit (IC(50) 0.24 μM), which was slightly better than digitoxigenin (IC(50) 0.64 μM), while none of the novel cardiac glycoside mimics display an in vitro effect as high as digitoxin (IC(50) 0.02 μM).
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23
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Yadav JS, Biswas SK, Sengupta S. Progress towards the total synthesis of 2,3-dihydroxytrinervitanes. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.03.065] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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24
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Progress towards the synthesis of piperazimycin A: synthesis of the non-proteogenic amino acids and elaboration into dipeptides. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.02.168] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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25
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Koza G, Rowles R, Theunissen C, Al-Dulayymi JR, Baird MS. The synthesis of single enantiomers of trans-alkene-containing mycolic acids. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.10.009] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Affiliation(s)
- Christophe Aïssa
- Department of Chemistry, University of Liverpool, Crown Street, L69 7ZD, Liverpool, England
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Zhang X, Lu Z, Fu C, Ma S. Synthesis of highly substituted allylic alcohols by a regio- and stereo-defined CuCl-mediated carbometallation reaction of 3-aryl-substituted secondary propargylic alcohols with Grignard reagents. Org Biomol Chem 2009; 7:3258-63. [DOI: 10.1039/b903769a] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Belov VN, Korneev SM, Angerer J, de Meijere A. Syntheses of D-Labelled Oxidative Metabolites of Acrylamide and Acrylonitrile for the Quantification of Their Toxicities in Humans. European J Org Chem 2008. [DOI: 10.1002/ejoc.200800291] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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One-pot sequential cross-metathesis/hydride reduction: highly stereoselective synthesis of primary (E)-allylic alcohols from terminal olefins. Tetrahedron Lett 2008. [DOI: 10.1016/j.tetlet.2008.03.132] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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