1
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Chen A, Han Y, Wu R, Yang B, Zhu L, Zhu F. Palladium-catalyzed Suzuki-Miyaura cross-couplings of stable glycal boronates for robust synthesis of C-1 glycals. Nat Commun 2024; 15:5228. [PMID: 38898022 PMCID: PMC11187158 DOI: 10.1038/s41467-024-49547-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2024] [Accepted: 06/07/2024] [Indexed: 06/21/2024] Open
Abstract
C-1 Glycals serve as pivotal intermediates in synthesizing diverse C-glycosyl compounds and natural products, necessitating the development of concise, efficient and user-friendly methods to obtain C-1 glycosides is essential. The Suzuki-Miyaura cross-coupling of glycal boronates is notable for its reliability and non-toxic nature, but glycal donor stability remains a challenge. Herein, we achieve a significant breakthrough by developing stable glycal boronates, effectively overcoming the stability issue in glycal-based Suzuki-Miyaura coupling. Leveraging the balanced reactivity and stability of our glycal boronates, we establish a robust palladium-catalyzed glycal-based Suzuki-Miyaura reaction, facilitating the formation of various C(sp2)-C(sp), C(sp2)-C(sp2), and C(sp2)-C(sp3) bonds under mild conditions. Notably, we expand upon this achievement by developing the DNA-compatible glycal-based cross-coupling reaction to synthesize various glycal-DNA conjugates. With its excellent reaction reactivity, stability, generality, and ease of handling, the method holds promise for widespread appication in the preparation of C-glycosyl compounds and natural products.
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Grants
- We are grateful for financial support from the National Key R&D Program of China (Grant No. 2023YFA1508800, F. Z.), National Science Foundation (Grant No. 22301178, F. Z.), Shanghai Pilot Program for Basic Research - Shanghai Jiao Tong University (Grant No. 21TQ1400210, F. Z.), Fundamental Research Funds for the Central Universities (Grant No. 22X010201631, F. Z.), the Open Grant from the Pingyuan Laboratory (Grant No. 2023PY-OP-0102, F. Z.), Natural Science Foundation of Shanghai (Grant No. 21ZR1435600, F. Z.), Shanghai Sailing Program (Grant No 21YF1420600, F. Z.). Part of this study was supported by the National Science Foundation (Grant No. 22301180, B. Y.).
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Affiliation(s)
- Anrong Chen
- Frontiers Science Center for Transformative Molecules, Center for Chemical Glycobiology, Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Chemistry and Chemical Engineering, Zhangjiang Institute for Advanced Study, Shanghai Jiao Tong University, Shanghai, PR China
| | - Yang Han
- Frontiers Science Center for Transformative Molecules, Center for Chemical Glycobiology, Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Chemistry and Chemical Engineering, Zhangjiang Institute for Advanced Study, Shanghai Jiao Tong University, Shanghai, PR China
| | - Rongfeng Wu
- Discovery Chemistry Unit, HitGen Inc., Chengdu, Sichuan, PR China
| | - Bo Yang
- Frontiers Science Center for Transformative Molecules, Center for Chemical Glycobiology, Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Chemistry and Chemical Engineering, Zhangjiang Institute for Advanced Study, Shanghai Jiao Tong University, Shanghai, PR China
| | - Lijuan Zhu
- Institute of Molecular Medicine, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, 160 Pujian Road, Shanghai, PR China.
| | - Feng Zhu
- Frontiers Science Center for Transformative Molecules, Center for Chemical Glycobiology, Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs, School of Chemistry and Chemical Engineering, Zhangjiang Institute for Advanced Study, Shanghai Jiao Tong University, Shanghai, PR China.
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2
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Wei Y, Wang Q, Koh MJ. A Photoinduced, Nickel-Catalyzed Reaction for the Stereoselective Assembly of C-Linked Glycosides and Glycopeptides. Angew Chem Int Ed Engl 2023; 62:e202214247. [PMID: 36355564 DOI: 10.1002/anie.202214247] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Indexed: 11/12/2022]
Abstract
C-Alkyl glycosides and glycoproteins exist in natural products and are prized for their role as carbohydrate mimics in drug design. However, a practical strategy that merges glycosyl donors with readily accessible reagents, derived from abundant carboxylic acid and amine feedstocks, is yet to be conceived. Herein, we show that a nickel catalyst promotes C-C coupling between glycosyl halides and aliphatic acids or primary amines (converted into redox-active electrophiles in one step), in the presence of Hantzsch ester and LiI (or Et3 N) under blue LED illumination to deliver C-alkyl glycosides with high diastereoselectivity. Mechanistic studies support the photoinduced formation of alkyl radicals that react with a glycosyl nickel species generated in situ to facilitate cross-coupling. Through this manifold, innate CO2 H and NH2 motifs embedded within amino acids and oligopeptides are selectively capped and functionalized to afford glycopeptide conjugates through late-stage glycosylation.
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Affiliation(s)
- Yi Wei
- Department of Chemistry, National University of Singapore, 4 Science Drive 2, Singapore, 117544, Republic of Singapore
| | - Quanquan Wang
- Department of Chemistry, National University of Singapore, 4 Science Drive 2, Singapore, 117544, Republic of Singapore
| | - Ming Joo Koh
- Department of Chemistry, National University of Singapore, 4 Science Drive 2, Singapore, 117544, Republic of Singapore
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3
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Hussain N, Hussain A. Advances in Pd-catalyzed C-C bond formation in carbohydrates and their applications in the synthesis of natural products and medicinally relevant molecules. RSC Adv 2021; 11:34369-34391. [PMID: 35497292 PMCID: PMC9042403 DOI: 10.1039/d1ra06351k] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2021] [Accepted: 09/27/2021] [Indexed: 12/13/2022] Open
Abstract
Advances in the Pd-catalyzed synthesis of C-glycosides and branched sugars are summarized herein and the strategies are categorized based on named reactions or types of sugar moieties involved in the reactions. These include cross-coupling reactions, C-H activations, and carbonylative cross-coupling reactions. Applications of Pd-catalyzed C-glycosylation reactions are discussed in the synthesis of natural products and biologically active molecules such as bergenin, papulacandin D, and SGLT2-inhibitors. Important mechanistic cycles are drawn and the mechanisms for how Pd-activates the sugar moieties for various coupling partners are discussed. The directing group-assisted C-glycosylation and some intramolecular C-H activation reactions are also included.
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Affiliation(s)
- Nazar Hussain
- Department of Medicinal Chemistry, Faculty of Ayurveda, Institute of Medical Sciences, BHU Varanasi-221005 India
| | - Altaf Hussain
- Department of Chemistry, Govt. Degree College Poonch J&K India 185101
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4
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Concise Large-Scale Synthesis of Tomatidine, A Potent Antibiotic Natural Product. Molecules 2021; 26:molecules26196008. [PMID: 34641551 PMCID: PMC8512692 DOI: 10.3390/molecules26196008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2021] [Revised: 09/29/2021] [Accepted: 09/30/2021] [Indexed: 11/17/2022] Open
Abstract
Tomatidine has recently generated a lot of interest amongst the pharmacology, medicine, and biology fields of study, especially for its newfound activity as an antibiotic agent capable of targeting multiple strains of bacteria. In the light of its low natural abundance and high cost, an efficient and scalable multi-gram synthesis of tomatidine has been developed. This synthesis uses a Suzuki-Miyaura-type coupling reaction as a key step to graft an enantiopure F-ring side chain to the steroidal scaffold of the natural product, which was accessible from low-cost and commercially available diosgenin. A Lewis acid-mediated spiroketal opening followed by an azide substitution and reduction sequence is employed to generate the spiroaminoketal motif of the natural product. Overall, this synthesis produced 5.2 g in a single pass in 15 total steps and 15.2% yield using a methodology that is atom economical, scalable, and requires no flash chromatography purifications.
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5
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Li G, Noguchi M, Arisaka G, Tanaka Y, Shoda SI. A protecting group-free approach for synthesizing C-glycosides through glycosyl dithiocarbamates. Org Biomol Chem 2021; 19:3134-3138. [PMID: 33885567 DOI: 10.1039/d1ob00311a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first protection/deprotection-free process for radical C-glycosylation has been achieved through one-step preparable glycosyl dithiocarbamates (GDTCs). The Giese-type reaction and radical allylation of unprotected GDTCs were successfully performed to obtain the corresponding α-C-glycosides stereoselectively under mild reaction conditions.
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Affiliation(s)
- Gefei Li
- Department of Biomolecular Engineering, Graduate School of Engineering, Tohoku University, 6-6-07, Aoba, Aoba-ku, Sendai, 980-8579 Japan.
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6
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Gong L, Sun HB, Deng LF, Zhang X, Liu J, Yang S, Niu D. Ni-Catalyzed Suzuki–Miyaura Cross-Coupling of α-Oxo-vinylsulfones To Prepare C-Aryl Glycals and Acyclic Vinyl Ethers. J Am Chem Soc 2019; 141:7680-7686. [PMID: 31025860 DOI: 10.1021/jacs.9b02312] [Citation(s) in RCA: 62] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Liang Gong
- Department of Emergency, State Key Laboratory of
Biotherapy and Cancer Center, West China Hospital, and School of Chemical Engineering, Sichuan University, Chengdu 610041, China
| | - Hong-Bao Sun
- Department of Emergency, State Key Laboratory of
Biotherapy and Cancer Center, West China Hospital, and School of Chemical Engineering, Sichuan University, Chengdu 610041, China
| | - Li-Fan Deng
- Department of Emergency, State Key Laboratory of
Biotherapy and Cancer Center, West China Hospital, and School of Chemical Engineering, Sichuan University, Chengdu 610041, China
| | - Xia Zhang
- Department of Emergency, State Key Laboratory of
Biotherapy and Cancer Center, West China Hospital, and School of Chemical Engineering, Sichuan University, Chengdu 610041, China
| | - Jie Liu
- Department of Emergency, State Key Laboratory of
Biotherapy and Cancer Center, West China Hospital, and School of Chemical Engineering, Sichuan University, Chengdu 610041, China
| | - Shengyong Yang
- Department of Emergency, State Key Laboratory of
Biotherapy and Cancer Center, West China Hospital, and School of Chemical Engineering, Sichuan University, Chengdu 610041, China
| | - Dawen Niu
- Department of Emergency, State Key Laboratory of
Biotherapy and Cancer Center, West China Hospital, and School of Chemical Engineering, Sichuan University, Chengdu 610041, China
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7
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Liu X, Hsiao CC, Guo L, Rueping M. Cross-Coupling of Amides with Alkylboranes via Nickel-Catalyzed C–N Bond Cleavage. Org Lett 2018; 20:2976-2979. [DOI: 10.1021/acs.orglett.8b01021] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xiangqian Liu
- RWTH Aachen University, Institute of Organic Chemistry, Landoltweg 1, 52074 Aachen, Germany
| | - Chien-Chi Hsiao
- RWTH Aachen University, Institute of Organic Chemistry, Landoltweg 1, 52074 Aachen, Germany
| | - Lin Guo
- RWTH Aachen University, Institute of Organic Chemistry, Landoltweg 1, 52074 Aachen, Germany
| | - Magnus Rueping
- RWTH Aachen University, Institute of Organic Chemistry, Landoltweg 1, 52074 Aachen, Germany
- King Abdullah University of Science and Technology (KAUST), Kaust Catalysis Center (KCC), Thuwal 23955-6900, Saudi Arabia
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8
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Zhu F, Rodriguez J, Yang T, Kevlishvili I, Miller E, Yi D, O'Neill S, Rourke MJ, Liu P, Walczak MA. Glycosyl Cross-Coupling of Anomeric Nucleophiles: Scope, Mechanism, and Applications in the Synthesis of Aryl C-Glycosides. J Am Chem Soc 2017; 139:17908-17922. [PMID: 29148749 DOI: 10.1021/jacs.7b08707] [Citation(s) in RCA: 80] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Stereoselective manipulations at the C1 anomeric position of saccharides are one of the central goals of preparative carbohydrate chemistry. Historically, the majority of reactions forming a bond with anomeric carbon has focused on reactions of nucleophiles with saccharide donors equipped with a leaving group. Here, we describe a novel approach to stereoselective synthesis of C-aryl glycosides capitalizing on the highly stereospecific reaction of anomeric nucleophiles. First, methods for the preparation of anomeric stannanes have been developed and optimized to afford both anomers of common saccharides in high anomeric selectivities. We established that oligosaccharide stannanes could be prepared from monosaccharide stannanes via O-glycosylation with Schmidt-type donors, glycal epoxides, or under dehydrative conditions with C1 alcohols. Second, we identified a general set of catalytic conditions with Pd2(dba)3 (2.5 mol%) and a bulky ligand (JackiePhos, 10 mol%) controlling the β-elimination pathway. We demonstrated that the glycosyl cross-coupling resulted in consistently high anomeric selectivities for both anomers with mono- and oligosaccharides, deoxysugars, saccharides with free hydroxyl groups, pyranose, and furanose substrates. The versatility of the glycosyl cross-coupling reaction was probed in the total synthesis of salmochelins (siderophores) and commercial anti-diabetic drugs (gliflozins). Combined experimental and computational studies revealed that the β-elimination pathway is suppressed for biphenyl-type ligands due to the shielding of Pd(II) by sterically demanding JackiePhos, whereas smaller ligands, which allow for the formation of a Pd-F complex, predominantly result in a glycal product. Similar steric effects account for the diminished rates of cross-couplings of 1,2-cis C1-stannanes with aryl halides. DFT calculations also revealed that the transmetalation occurs via a cyclic transition state with retention of configuration at the anomeric position. Taken together, facile access to both anomers of various glycoside nucleophiles, a broad reaction scope, and uniformly high transfer of anomeric configuration make the glycosyl cross-coupling reaction a practical tool for the synthesis of bioactive natural products, drug candidates, allowing for late-stage glycodiversification studies with small molecules and biologics.
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Affiliation(s)
- Feng Zhu
- Department of Chemistry and Biochemistry, University of Colorado , Boulder, Colorado 80309, United States
| | - Jacob Rodriguez
- Department of Chemistry and Biochemistry, University of Colorado , Boulder, Colorado 80309, United States
| | - Tianyi Yang
- Department of Chemistry and Biochemistry, University of Colorado , Boulder, Colorado 80309, United States
| | - Ilia Kevlishvili
- Department of Chemistry, University of Pittsburgh , Pittsburgh, Pennsylvania 15260, United States
| | - Eric Miller
- Department of Chemistry and Biochemistry, University of Colorado , Boulder, Colorado 80309, United States
| | - Duk Yi
- Department of Chemistry and Biochemistry, University of Colorado , Boulder, Colorado 80309, United States
| | - Sloane O'Neill
- Department of Chemistry and Biochemistry, University of Colorado , Boulder, Colorado 80309, United States
| | - Michael J Rourke
- Department of Chemistry and Biochemistry, University of Colorado , Boulder, Colorado 80309, United States
| | - Peng Liu
- Department of Chemistry, University of Pittsburgh , Pittsburgh, Pennsylvania 15260, United States
| | - Maciej A Walczak
- Department of Chemistry and Biochemistry, University of Colorado , Boulder, Colorado 80309, United States
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9
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The Synthesis and Biological Characterization of Acetal-Free Mimics of the Tumor-Associated Carbohydrate Antigens. Adv Carbohydr Chem Biochem 2017; 74:137-237. [PMID: 29173726 DOI: 10.1016/bs.accb.2017.10.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Carcinomas express unique carbohydrates, known as tumor-associated carbohydrate antigens (TACAs), on their surface. These are potential targets for anticancer vaccines; however, to date, no such vaccine has reached the clinic. One factor that may complicate the success of this effort is the lability of the glycosidic bond. Acetal-free carbohydrates are analogues that lack the glycosidic linkage by replacing either the endo or exo oxygen with a methylene. This chapter summarizes the seminal syntheses of the mucin TACAs, provides an overview of common techniques for the synthesis of carbasugars and C-glycosides, reviews the syntheses published to date of acetal-free TACA analogues, and provides an overview of their observed biological activity. We conclude by offering a summation of the challenges remaining to the field biologically and the potential that acetal-free TACAs have of answering several basic questions in carbohydrate immunology.
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10
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Verano AL, Tan DS. Stereocontrolled Synthesis of Spiroketals: An Engine for Chemical and Biological Discovery. Isr J Chem 2017; 57:279-291. [PMID: 29104308 DOI: 10.1002/ijch.201600134] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Spiroketals are key structural motifs found in diverse natural products with compelling biological activities. However, stereocontrolled synthetic access to spiroketals, independent of their inherent thermodynamic preferences, is a classical challenge in organic synthesis that has limited in-depth biological exploration of this intriguing class. Herein, we review our laboratory's efforts to advance the glycal epoxide approach to the stereocontrolled synthesis of spiroketals via kinetically controlled spirocyclization reactions. This work has provided new synthetic methodologies with applications in both diversity- and target-oriented synthesis, fundamental insights into structure and reactivity, and efficient access to spiroketal libraries and natural products for biological evaluation.
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Affiliation(s)
- Alyssa L Verano
- Pharmacology Program, Weill Cornell Graduate School of Medical Sciences, Memorial Sloan Kettering Cancer Center, 1275 York Avenue, Box 422, New York, New York 10065, USA
| | - Derek S Tan
- Pharmacology Program, Weill Cornell Graduate School of Medical Sciences, Memorial Sloan Kettering Cancer Center, 1275 York Avenue, Box 422, New York, New York 10065, USA.,Chemical Biology Program and Tri-Institutional Research Program, Memorial Sloan Kettering Cancer Center, 1275 York Avenue, Box 422, New York, New York 10065, USA
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11
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Affiliation(s)
- You Yang
- Shanghai
Key Laboratory of New Drug Design, School of Pharmacy, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
| | - Biao Yu
- State
Key Laboratory of Bio-organic and Natural Products Chemistry, Shanghai
Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
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12
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Li X, Zhu J. Glycosylation via Transition-Metal Catalysis: Challenges and Opportunities. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600484] [Citation(s) in RCA: 71] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Xiaohua Li
- Department of Natural Sciences; University of Michigan-Dearborn; 4901 Evergreen Road 48128 Dearborn Michigan USA
| | - Jianglong Zhu
- Department of Chemistry and Biochemistry and School of Green Chemistry and Engineering; The University of Toledo; 2801 West Bancroft Street 43606 Toledo Ohio USA
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13
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Guo L, Hsiao CC, Yue H, Liu X, Rueping M. Nickel-Catalyzed Csp2–Csp3 Cross-Coupling via C–O Bond Activation. ACS Catal 2016. [DOI: 10.1021/acscatal.6b00801] [Citation(s) in RCA: 79] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Lin Guo
- Institute
of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
| | - Chien-Chi Hsiao
- Institute
of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
| | - Huifeng Yue
- Institute
of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
| | - Xiangqian Liu
- Institute
of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
| | - Magnus Rueping
- Institute
of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany
- King Abdullah University of Science and Technology (KAUST), KAUST Catalysis Center (KCC), Thuwal 23955-6900, Saudi Arabia
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14
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Liu M, Niu Y, Wu YF, Ye XS. Ligand-Controlled Monoselective C-Aryl Glycoside Synthesis via Palladium-Catalyzed C–H Functionalization of N-Quinolyl Benzamides with 1-Iodoglycals. Org Lett 2016; 18:1836-9. [DOI: 10.1021/acs.orglett.6b00566] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Minglong Liu
- State Key Laboratory of Natural
and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Xue Yuan Road No. 38, Beijing 100191, China
| | - Youhong Niu
- State Key Laboratory of Natural
and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Xue Yuan Road No. 38, Beijing 100191, China
| | - Yan-Fen Wu
- State Key Laboratory of Natural
and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Xue Yuan Road No. 38, Beijing 100191, China
| | - Xin-Shan Ye
- State Key Laboratory of Natural
and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Xue Yuan Road No. 38, Beijing 100191, China
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15
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Lenci E, Menchi G, Trabocchi A. Carbohydrates in diversity-oriented synthesis: challenges and opportunities. Org Biomol Chem 2016; 14:808-25. [DOI: 10.1039/c5ob02253c] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Carbohydrates are attractive building blocks for diversity-oriented synthesis due to their stereochemical diversity and high density of polar functional groups.
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Affiliation(s)
- E. Lenci
- Department of Chemistry “Ugo Schiff”
- University of Florence
- Sesto Fiorentino
- Italy
| | - G. Menchi
- Department of Chemistry “Ugo Schiff”
- University of Florence
- Sesto Fiorentino
- Italy
| | - A. Trabocchi
- Department of Chemistry “Ugo Schiff”
- University of Florence
- Sesto Fiorentino
- Italy
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16
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Larsen BJ, Sun Z, Lachacz E, Khomutnyk Y, Soellner MB, Nagorny P. Synthesis and Biological Evaluation of Lactimidomycin and Its Analogues. Chemistry 2015; 21:19159-67. [PMID: 26577990 DOI: 10.1002/chem.201503527] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2015] [Indexed: 02/06/2023]
Abstract
The studies culminating in the total synthesis of the glutarimide-containing eukaryote translation elongation inhibitor lactimidomycin are described. The optimized synthetic route features a Zn(II)-mediated intramolecular Horner-Wadsworth-Emmons (HWE) reaction resulting in a highly stereoselective formation of the strained 12-membered macrolactone of lactimidomycin on a 423 mg scale. The presence of the E,Z-diene functionality was found to be key for effective macrocyclizations as a complete removal of these unsaturation units resulted in exclusive formation of the dimer rather than monocyclic enoate. The synthetic route features a late-stage installation of the glutarimide functionality via an asymmetric catalytic Mukaiyama aldol reaction, which allows for a quick generation of lactimidomycin homolog 55 containing two additional carbons in the glutarimide side chain. Similar to lactimidomycin, this analog was found to possess cytotoxicity against MDA-MB-231 breast cancer cells (GI50 =1-3 μM) using in vitro 2D and 3D assays. Although lactimidomycin was found to be the most potent compound in terms of anticancer activity, 55 as well as truncated analogues 50-52 lacking the glutarimide side-chain were found to be significantly less toxic against human mammary epithelial cells.
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Affiliation(s)
- Brian J Larsen
- Department of Chemistry, University of Michigan, 930 N. University Avenue, Ann Arbor, MI 48109-1055 (USA)
| | - Zhankui Sun
- Department of Chemistry, University of Michigan, 930 N. University Avenue, Ann Arbor, MI 48109-1055 (USA)
| | - Eric Lachacz
- Medicinal Chemistry Department, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, MI 48109-1065 (USA)
| | - Yaroslav Khomutnyk
- Department of Chemistry, University of Michigan, 930 N. University Avenue, Ann Arbor, MI 48109-1055 (USA)
| | - Matthew B Soellner
- Medicinal Chemistry Department, College of Pharmacy, University of Michigan, 428 Church Street, Ann Arbor, MI 48109-1065 (USA).
| | - Pavel Nagorny
- Department of Chemistry, University of Michigan, 930 N. University Avenue, Ann Arbor, MI 48109-1055 (USA).
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17
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Abstract
The first total synthesis of aphadilactones A-D, diastereomeric natural products recently isolated from the Meliaceae plant Aphanamixis grandifolia by Yue and co-workers, which possess an unprecedented carbon skeleton, has been achieved. The synthesis features a catalytic asymmetric hetero-Diels-Alder reaction to form the dihydropyran ring, concurrent installation of the lactone and furan moieties via a tandem acid-catalyzed acetal cleavage, oxidation, and cyclization process, and an intermolecular Diels-Alder reaction to forge the target products.
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Affiliation(s)
- Jian-Peng Yin
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University , Lanzhou 730000, PR China
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18
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Procopiou PA, Barrett VJ, Biggadike K, Butchers PR, Craven A, Ford AJ, Guntrip SB, Holmes DS, Hughes SC, Jones AE, Looker BE, Mutch PJ, Ruston M, Needham D, Smith CE. Discovery of a Rapidly Metabolized, Long-Acting β2 Adrenergic Receptor Agonist with a Short Onset Time Incorporating a Sulfone Group Suitable for Once-Daily Dosing. J Med Chem 2013; 57:159-70. [DOI: 10.1021/jm401532g] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Panayiotis A. Procopiou
- Department of
Medicinal Chemistry, GlaxoSmithKline Medicines Research Centre, Gunnels Wood
Road, Stevenage, Hertfordshire, SG1 2NY, United Kingdom
| | - Victoria J. Barrett
- Respiratory
Biology, GlaxoSmithKline Medicines Research Centre, Gunnels Wood Road, Stevenage, Hertfordshire, SG1 2NY, United Kingdom
| | - Keith Biggadike
- Department of
Medicinal Chemistry, GlaxoSmithKline Medicines Research Centre, Gunnels Wood
Road, Stevenage, Hertfordshire, SG1 2NY, United Kingdom
| | - Peter R. Butchers
- Respiratory
Biology, GlaxoSmithKline Medicines Research Centre, Gunnels Wood Road, Stevenage, Hertfordshire, SG1 2NY, United Kingdom
| | - Andrew Craven
- Department of
Medicinal Chemistry, GlaxoSmithKline Medicines Research Centre, Gunnels Wood
Road, Stevenage, Hertfordshire, SG1 2NY, United Kingdom
| | - Alison J. Ford
- Respiratory
Biology, GlaxoSmithKline Medicines Research Centre, Gunnels Wood Road, Stevenage, Hertfordshire, SG1 2NY, United Kingdom
| | - Stephen B. Guntrip
- Department of
Medicinal Chemistry, GlaxoSmithKline Medicines Research Centre, Gunnels Wood
Road, Stevenage, Hertfordshire, SG1 2NY, United Kingdom
| | - Duncan S. Holmes
- Department of
Medicinal Chemistry, GlaxoSmithKline Medicines Research Centre, Gunnels Wood
Road, Stevenage, Hertfordshire, SG1 2NY, United Kingdom
| | - Sara C. Hughes
- Respiratory
Biology, GlaxoSmithKline Medicines Research Centre, Gunnels Wood Road, Stevenage, Hertfordshire, SG1 2NY, United Kingdom
| | - Anne E. Jones
- Drug Metabolism
and Pharmacokinetics, GlaxoSmithKline Medicines Research Centre, Gunnels Wood
Road, Stevenage, Hertfordshire, SG1 2NY, United Kingdom
| | - Brian E. Looker
- Department of
Medicinal Chemistry, GlaxoSmithKline Medicines Research Centre, Gunnels Wood
Road, Stevenage, Hertfordshire, SG1 2NY, United Kingdom
| | - Peter J. Mutch
- Drug Metabolism
and Pharmacokinetics, GlaxoSmithKline Medicines Research Centre, Gunnels Wood
Road, Stevenage, Hertfordshire, SG1 2NY, United Kingdom
| | - Mark Ruston
- Department of
Medicinal Chemistry, GlaxoSmithKline Medicines Research Centre, Gunnels Wood
Road, Stevenage, Hertfordshire, SG1 2NY, United Kingdom
| | - Deborah Needham
- Department of
Medicinal Chemistry, GlaxoSmithKline Medicines Research Centre, Gunnels Wood
Road, Stevenage, Hertfordshire, SG1 2NY, United Kingdom
| | - Claire E. Smith
- Drug Metabolism
and Pharmacokinetics, GlaxoSmithKline Medicines Research Centre, Gunnels Wood
Road, Stevenage, Hertfordshire, SG1 2NY, United Kingdom
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Larsen BJ, Sun Z, Nagorny P. Synthesis of Eukaryotic Translation Elongation Inhibitor Lactimidomycin via Zn(II)-Mediated Horner–Wadsworth–Emmons Macrocyclization. Org Lett 2013; 15:2998-3001. [DOI: 10.1021/ol401186f] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Brian J. Larsen
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Zhankui Sun
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Pavel Nagorny
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
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20
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Koester DC, Kriemen E, Werz DB. Flexible Synthesis of 2-Deoxy-C-Glycosides and (1→2)-, (1→3)-, and (1→4)-LinkedC-Glycosides. Angew Chem Int Ed Engl 2013; 52:2985-9. [DOI: 10.1002/anie.201209697] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2012] [Indexed: 11/07/2022]
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21
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Koester DC, Kriemen E, Werz DB. Flexible Synthese von 2-Desoxy-C-Glycosiden sowie (1→2)-, (1→3)- und (1→4)-verknüpftenC-Glycosiden. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201209697] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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22
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Koester DC, Werz DB. Sonogashira-Hagihara reactions of halogenated glycals. Beilstein J Org Chem 2012; 8:675-82. [PMID: 23015813 PMCID: PMC3388853 DOI: 10.3762/bjoc.8.75] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2012] [Accepted: 04/04/2012] [Indexed: 12/16/2022] Open
Abstract
Herein, we report on our findings of the Sonogashira-Hagihara reaction with 1-iodinated and 2-brominated glycals using several aromatic and aliphatic alkynes. This Pd-catalyzed cross-coupling reaction presents a facile access to alkynyl C-glycosides and sets the stage for a reductive/oxidative refunctionalization of the enyne moiety to regenerate either C-glycosidic structures or pyran derivatives with a substituent in position 2.
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Affiliation(s)
- Dennis C Koester
- Institut für Organische und Biomolekulare Chemie, Georg-August-Universität Göttingen, Tammannstr. 2, 37077 Göttingen, Germany
| | - Daniel B Werz
- Institut für Organische und Biomolekulare Chemie, Georg-August-Universität Göttingen, Tammannstr. 2, 37077 Göttingen, Germany
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23
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Cobo I, Matheu MI, Castillón S, Boutureira O, Davis BG. Phosphine-Free Suzuki–Miyaura Cross-Coupling in Aqueous Media Enables Access to 2-C-Aryl-Glycosides. Org Lett 2012; 14:1728-31. [DOI: 10.1021/ol3003139] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Isidro Cobo
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford OX1 3TA, U.K., and Departament de Química Analítica i Química Orgànica, Universitat Rovira i Virgili, C/Marcel·lí Domingo s/n, 43007 Tarragona, Spain
| | - M. Isabel Matheu
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford OX1 3TA, U.K., and Departament de Química Analítica i Química Orgànica, Universitat Rovira i Virgili, C/Marcel·lí Domingo s/n, 43007 Tarragona, Spain
| | - Sergio Castillón
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford OX1 3TA, U.K., and Departament de Química Analítica i Química Orgànica, Universitat Rovira i Virgili, C/Marcel·lí Domingo s/n, 43007 Tarragona, Spain
| | - Omar Boutureira
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford OX1 3TA, U.K., and Departament de Química Analítica i Química Orgànica, Universitat Rovira i Virgili, C/Marcel·lí Domingo s/n, 43007 Tarragona, Spain
| | - Benjamin G. Davis
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford OX1 3TA, U.K., and Departament de Química Analítica i Química Orgànica, Universitat Rovira i Virgili, C/Marcel·lí Domingo s/n, 43007 Tarragona, Spain
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24
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Merino P, Tejero T, Marca E, Gomollón-Bel F, Delso I, Matute R. CROSS-COUPLING REACTIONS FOR THE SYNTHESIS OF C-GLYCOSIDES AND RELATED COMPOUNDS. HETEROCYCLES 2012. [DOI: 10.3987/rev-12-sr(n)3] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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25
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Jana R, Pathak TP, Sigman MS. Advances in transition metal (Pd, Ni, Fe)-catalyzed cross-coupling reactions using alkyl-organometallics as reaction partners. Chem Rev 2011; 111:1417-92. [PMID: 21319862 PMCID: PMC3075866 DOI: 10.1021/cr100327p] [Citation(s) in RCA: 1665] [Impact Index Per Article: 128.1] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Ranjan Jana
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112-8500
| | - Tejas P. Pathak
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112-8500
| | - Matthew S. Sigman
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112-8500
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26
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Fuwa H. Total Synthesis of Structurally Complex Marine Oxacyclic Natural Products. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2010. [DOI: 10.1246/bcsj.20100209] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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27
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Koester DC, Leibeling M, Neufeld R, Werz DB. A Pd-Catalyzed Approach to (1→6)-Linked C-Glycosides. Org Lett 2010; 12:3934-7. [DOI: 10.1021/ol101625p] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Dennis C. Koester
- Institut für Organische und Biomolekulare Chemie der Georg-August-Universität Göttingen, Tammannstr. 2, D-37077 Göttingen, Germany
| | - Markus Leibeling
- Institut für Organische und Biomolekulare Chemie der Georg-August-Universität Göttingen, Tammannstr. 2, D-37077 Göttingen, Germany
| | - Roman Neufeld
- Institut für Organische und Biomolekulare Chemie der Georg-August-Universität Göttingen, Tammannstr. 2, D-37077 Göttingen, Germany
| | - Daniel B. Werz
- Institut für Organische und Biomolekulare Chemie der Georg-August-Universität Göttingen, Tammannstr. 2, D-37077 Göttingen, Germany
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28
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Gómez AM, Pedregosa A, Barrio A, Valverde S, López JC. Synthesis of FuranosylC-1 Glycals through Palladium-Catalyzed Reactions of a Furanosyl 2,3-Anhydro-exo-glycal. European J Org Chem 2009. [DOI: 10.1002/ejoc.200900585] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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30
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Gómez AM, Pedregosa A, Casillas M, Uriel C, López JC. Synthesis ofC-1 Alkyl and Aryl Glycals from Pyranosyl or Furanosyl Chlorides by Treatment with Organolithium Reagents. European J Org Chem 2009. [DOI: 10.1002/ejoc.200900417] [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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31
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Gong H, Gagné MR. Diastereoselective Ni-Catalyzed Negishi Cross-Coupling Approach to Saturated, Fully Oxygenated C-Alkyl and C-Aryl Glycosides. J Am Chem Soc 2008; 130:12177-83. [DOI: 10.1021/ja8041564] [Citation(s) in RCA: 186] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hegui Gong
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290
| | - Michel R. Gagné
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290
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32
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Pinheiro EDS, Antunes OAC, Fortunak JMD. A survey of the syntheses of active pharmaceutical ingredients for antiretroviral drug combinations critical to access in emerging nations. Antiviral Res 2008; 79:143-65. [PMID: 18571246 DOI: 10.1016/j.antiviral.2008.05.001] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2006] [Revised: 04/17/2008] [Accepted: 05/05/2008] [Indexed: 11/24/2022]
Abstract
It has been roughly 25 years since the threat posed by human immunodeficiency virus type 1 (HIV-1) became widely known. The cumulative death toll from HIV/AIDS is now greater than 25 million. There are approximately 33 million people living worldwide with this disease, of whom about 68% (22.5 million) live in sub-Saharan Africa (http://www.avert.org/worldstats.htm). A number of antiretroviral (ARV) drugs have been approved for treatment of HIV/AIDS. Inhibitors of HIV reverse transcriptase (RTIs) include the nucleoside/nucleotide drugs zidovudine, lamivudine, abacavir, didanosine, stavudine, emtricitabine and tenofovir disoproxil fumarate. Non-nucleoside RTIs include nevirapine, efavirenz and etravirine. Inhibitors of HIV protease (PIs) include saquinavir, ritonavir, lopinavir, nelfinavir, indinavir, fosamprenavir and atazanavir. Enfuvirtide inhibits the HIV fusion protein. The CCR5 chemokine antagonist maraviroc and the integrase inhibitor raltegravir were very recently approved by the US FDA. Fixed-dose combinations (FDCs) have been formulated to increase tolerability, convenience and compliance. First-line drug combinations are offered to treatment-naive patients, while second-line drugs are reserved for those who no longer respond adequately to first-line therapy. In developing countries a modest but increasing fraction of those infected have access to ARVs. The Clinton HIV/AIDS Initiative estimates that 2.4 million of the nearly 8 million individuals needing treatment in developing nations have access to some drugs. First-line FDCs used in resource-poor settings are largely combinations of two nucleoside RTIs and a non-nucleoside RTI or PI. The effectiveness of these combinations decreases over time, requiring a switch to combinations that retain potency in the presence of viral resistance. Increasing access to second-line FDCs and new developments in first-line ARV therapy are cost challenges. In high-income countries the cost of ARV therapy is largely irrelevant, except for "advanced salvage" drugs such as enfuvirtide. In resource-poor settings cost is a huge factor that limits drug access, resulting in high rates of new infection and subsequent mortality. IP coverage, where granted, can keep access prices for essential ARVs higher than would otherwise be the case. Large, innovator companies have made drugs available at prices very close to the cost of manufacturing for "lowest income" countries. Generic providers in India and elsewhere provide the largest supply of drugs for the developing world. The recent issuance of Voluntary and Compulsory Licenses (VLs, CLs) through the World Trade Organization's TRIP (Treaty Respecting Intellectual Property) provisions arguably contribute to bringing down access prices. The utilization of improved science, pooled purchasing and intelligent procurement practices all definitely contribute to access. This work surveys the production processes for several critical ARVs. These are discussed in terms of scale up, raw material/intermediates and active pharmaceutical ingredient (API) costs. In some cases new routes to APIs or critical intermediates are needed. Based on potential new chemistries, there are significant opportunities to reduce cost for a number of critical ARVs.
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Affiliation(s)
- Eloan Dos Santos Pinheiro
- Instituto de Química, UFRJ, CT Bloco A, Lab 641, Cidade Universitária, Rio de Janeiro, RJ 21945-970, Brazil.
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Sasaki M, Fuwa H. Convergent strategies for the total synthesis of polycyclic ether marine metabolites. Nat Prod Rep 2008; 25:401-26. [PMID: 18389143 DOI: 10.1039/b705664h] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Marine polycyclic ether natural products continue to fascinate chemists and biologists due to their exceptionally large and complex molecular architectures and potent and diverse biological activities. Tremendous progress has been made over the past decade toward the total synthesis of marine polycyclic ether natural products. In this area, a convergent strategy for assembling small fragments into an entire molecule always plays a key role in successful total synthesis. This review describes our efforts to develop convergent strategies for the synthesis of polycyclic ethers and their application to the total synthesis of gambierol, gymnocin-A, and brevenal, and to the partial synthesis of the central part of ciguatoxins and the nonacyclic polyether skeleton of gambieric acids.
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Affiliation(s)
- Makoto Sasaki
- Laboratory of Biostructural Chemistry, Graduate School of Life Sciences, Tohoku University, 1-1 Tsutsumidori-amamiya, Aoba-ku, Sendai 981-8555, Japan.
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Meek SJ, Pradaux F, Demont EH, Harrity JPA. Development of a Stereoselective Co-Mediated Dihydropyran Ring Contraction. Org Lett 2006; 8:5597-600. [PMID: 17107081 DOI: 10.1021/ol062329g] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A highly stereoselective approach for the synthesis of trans-1,2-disubstituted cyclobutanes through an Al-promoted cobalt-mediated O-->C ring contraction of dihydropyrans is described. [reaction: see text].
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Affiliation(s)
- Simon J Meek
- Department of Chemistry, University of Sheffield, Brook Hill, Sheffield, S3 7HF, UK
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35
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Boyd E, Hallett MR, Jones RV, Painter JE, Patel P, Quayle P, Waring (née Potts) AJ. The lithiation of 2-chloroglucal derivatives. Tetrahedron Lett 2006. [DOI: 10.1016/j.tetlet.2006.09.087] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Moilanen SB, Potuzak JS, Tan DS. Stereocontrolled synthesis of spiroketals via Ti(Oi-Pr)4-mediated kinetic spirocyclization of glycal epoxides with retention of configuration. J Am Chem Soc 2006; 128:1792-3. [PMID: 16464069 PMCID: PMC2553756 DOI: 10.1021/ja057908f] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A Ti(Oi-Pr)4-mediated kinetic spiroketalization reaction has been developed for the stereocontrolled target- and diversity-oriented synthesis of spiroketals. In contrast to most existing methods for spiroketal synthesis, this reaction does not rely upon thermodynamic control over the stereochemical configuration at the anomeric carbon. Stereochemically diverse glycals are first alkylated at the C1-position to introduce a hydroxyl-bearing side chain, then epoxidized stereoselectively. Treatment with Ti(Oi-Pr)4 leads to an unusual kinetic epoxide-opening spirocyclization (spirocycloisomerization) with retention of configuration at the anomeric carbon. The reaction is proposed to proceed via a chelation-controlled mechanism and has been used to form five-, six-, and seven-membered rings with stereochemically diverse substituents. This approach may also be useful for the related intermolecular beta-mannosidation reaction. This Ti(Oi-Pr)4-mediated spirocyclization is stereochemically complementary to our previously reported MeOH-induced spirocyclization, which proceeds with inversion of configuration, and together, these reactions provide comprehensive access to systematically stereochemically diversified spiroketals.
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40
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Li XL, Xu XM, Tian J, Li YX. Stereoselective Synthesis of NovelC-Disaccharides via Suzuki Cross-Coupling Reaction. CHINESE J CHEM 2005. [DOI: 10.1002/cjoc.200591564] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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41
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Potuzak JS, Moilanen SB, Tan DS. Stereocontrolled Synthesis of Spiroketals via a Remarkable Methanol-Induced Kinetic Spirocyclization Reaction. J Am Chem Soc 2005; 127:13796-7. [PMID: 16201793 DOI: 10.1021/ja055033z] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A methanol-induced kinetic spiroketalization reaction has been developed for the stereocontrolled target- and diversity-oriented synthesis of spiroketals. In contrast to existing methods for spiroketal synthesis, this reaction does not depend on thermodynamic product stability or require axial attack of an oxygen nucleophile. Stereodiverse glycals are alkylated at the C1 position with side chains bearing protected hydroxyl groups. After alcohol deprotection, the glycal is epoxidized stereoselectively, then the side chain hydroxyl is spirocyclized with inversion of configuration at the anomeric carbon by addition of excess MeOH at -63 degrees C. This spirocyclization reaction appears to proceed by MeOH hydrogen-bonding catalysis and has been used to form five- and six-membered rings with stereoisomeric substituents. In some cases, the stereocomplementary spiroketals can be also obtained by classical acid-catalyzed equilibration.
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Affiliation(s)
- Justin S Potuzak
- Pharmacology Program, Weill Graduate School of Medical Sciences of Cornell University, 1275 York Avenue, Box 422, New York, New York 10021, USA
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Shang S, Tan DS. Advancing chemistry and biology through diversity-oriented synthesis of natural product-like libraries. Curr Opin Chem Biol 2005; 9:248-58. [PMID: 15939326 DOI: 10.1016/j.cbpa.2005.03.006] [Citation(s) in RCA: 104] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2005] [Accepted: 03/30/2005] [Indexed: 11/20/2022]
Abstract
Natural products provide the inspiration for a variety of strategies used in the diversity-oriented synthesis of novel small-molecule libraries. These libraries can be based on core scaffolds from individual natural products, specific substructures found across a class of natural products, or general structural characteristics of natural products. An increasing body of evidence supports the effectiveness of these strategies for identifying new biologically active molecules. Moreover, these efforts have led to significant advances in synthetic organic chemistry. Larger-scale evaluation of these approaches is on the horizon, using screening data that will be made publicly available in the new PubChem database.
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Affiliation(s)
- Shiying Shang
- Pharmacology Program, Weill Graduate School of Medical Sciences of Cornell University, Ithaca, New York, USA
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Moilanen SB, Tan DS. Enantioselective synthesis of erythro-4-deoxyglycals as scaffolds for target- and diversity-oriented synthesis: new insights into glycal reactivity. Org Biomol Chem 2005; 3:798-803. [PMID: 15731865 DOI: 10.1039/b417429a] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient, enantioselective synthesis of erythro-4-deoxyglycals has been developed using asymmetric aldehyde allylation and tungsten-catalyzed alkynol endo-cycloisomerization as the key steps. These versatile synthetic scaffolds have been elaborated to a variety of products using stereoselective transformations that are complementary to those available using the corresponding threo glycals. This work has provided valuable insights into the relationships between glycal structure and reactivity. In addition, a new diene-forming side reaction during tungsten-catalyzed alkynol cycloisomerization has been discovered.
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Affiliation(s)
- Sirkka B Moilanen
- Tri-Institutional Training Program in Chemical Biology, Memorial Sloan-Kettering Cancer Center, New York, NY 10021, USA
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