1
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Sharma H, Ganguly S, Sahana MH, Goswami RK. Stereoselective synthesis of thailandamide A methyl ester. Org Biomol Chem 2024; 22:1409-1419. [PMID: 38285182 DOI: 10.1039/d3ob02107f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2024]
Abstract
A convergent strategy for the stereoselective synthesis of the methyl ester of the structurally challenging and highly labile antibacterial polyene polyketide natural product thailandamide A has been developed. The key steps include the Zincke aldehyde reaction, Stille cross coupling, Negishi reaction, Julia-Kocienski olefination, cross metathesis, and the less explored Pd(I)-based Heck coupling to access different unsaturation bonds. Additionally, Urpi acetal aldol, Evans methylation, and Crimmins acetate aldol reactions were employed to construct four out of six asymmetric centers of the molecule.
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Affiliation(s)
- Himangshu Sharma
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India.
| | - Swapnamoy Ganguly
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India.
| | - Moinul Haque Sahana
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India.
| | - Rajib Kumar Goswami
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India.
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2
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Kim N, Sengupta S, Lee J, Dash U, Kim S, Kim HJ, Song C, Sim T. Synthesis and antibacterial activities of baulamycin A inspired derivatives. Eur J Med Chem 2023; 259:115592. [PMID: 37478559 DOI: 10.1016/j.ejmech.2023.115592] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Revised: 06/20/2023] [Accepted: 06/23/2023] [Indexed: 07/23/2023]
Abstract
SbnE is an essential enzyme for staphyloferrin B biosynthesis in Staphylococcus aureus. An earlier study showed that natural product baulamycin A has in vitro inhibitory activity against SbnE and antibacterial potency. A SAR study with analogues of baulamycin A was conducted to identify potent inhibitors of SbnE and/or effective antibiotics against MRSA. The results show that selected analogues, including 11, 18, 21, 24a, 24c, 24m and 24n, exhibit single-digit micromolar inhibitory potencies against SbnE (IC50s = 1.81-8.94 μM) and 11, 24m, 24n possess significant activities against both SbnE (IC50s = 4.12-6.12 μM) and bacteria (MICs = 4-32 μg/mL). Biological investigations revealed that these substances possess potent cell wall disruptive activities and that they inhibit siderophore production in MRSA. Among the selected analogues, 7 has excellent antibiotic activities both gram-positive and -negative bacteria (0.5-4 μg/mL). Moreover, these analogues significantly impede biofilm formation in a concentration-dependent manner. Taken together, the results of the investigation provide valuable insight into the nature of novel baulamycin A analogues that have potential efficacy against MRSA owing to their membrane damaging activity and/or inhibitory efficacy against siderophore production.
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Affiliation(s)
- Namkyoung Kim
- KU-KIST Graduate School of Converging Science and Technology, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea; Chemical Kinomics Research Center, Korea Institute of Science and Technology (KIST), 5 Hwarangro 14-gil, Seongbuk-gu, Seoul, 02792, Republic of Korea; Severance Biomedical Science Institute, Graduate School of Medicinal Science, Brain Korea 21 Project, Yonsei University College of Medicine, 50, Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea
| | - Sandip Sengupta
- Chemical Kinomics Research Center, Korea Institute of Science and Technology (KIST), 5 Hwarangro 14-gil, Seongbuk-gu, Seoul, 02792, Republic of Korea; Severance Biomedical Science Institute, Graduate School of Medicinal Science, Brain Korea 21 Project, Yonsei University College of Medicine, 50, Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea
| | - Jiwon Lee
- Severance Biomedical Science Institute, Graduate School of Medicinal Science, Brain Korea 21 Project, Yonsei University College of Medicine, 50, Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea
| | - Uttam Dash
- Chemical Kinomics Research Center, Korea Institute of Science and Technology (KIST), 5 Hwarangro 14-gil, Seongbuk-gu, Seoul, 02792, Republic of Korea
| | - Soojeung Kim
- Department of Chemistry, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Hak Joong Kim
- Department of Chemistry, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea
| | - Chiman Song
- Chemical Kinomics Research Center, Korea Institute of Science and Technology (KIST), 5 Hwarangro 14-gil, Seongbuk-gu, Seoul, 02792, Republic of Korea
| | - Taebo Sim
- KU-KIST Graduate School of Converging Science and Technology, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul, 02841, Republic of Korea; Chemical Kinomics Research Center, Korea Institute of Science and Technology (KIST), 5 Hwarangro 14-gil, Seongbuk-gu, Seoul, 02792, Republic of Korea; Severance Biomedical Science Institute, Graduate School of Medicinal Science, Brain Korea 21 Project, Yonsei University College of Medicine, 50, Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea.
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3
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Sharma H, Mondal J, Ghosh AK, Pal RR, Goswami RK. Total synthesis of the antibacterial polyketide natural product thailandamide lactone. Chem Sci 2022; 13:13403-13408. [PMID: 36507156 PMCID: PMC9682914 DOI: 10.1039/d2sc04727f] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Accepted: 10/20/2022] [Indexed: 12/15/2022] Open
Abstract
Stereoselective total synthesis of the structurally intriguing polyketide natural product thailandamide lactone was accomplished, and done so using a convergent approach for the first time to the best of our knowledge. The key features of this synthesis included use of a Crimmins acetate aldol reaction, Evans methylation, Urpi acetal aldol reaction, Sharpless asymmetric epoxidation and subsequent γ-lactonization for the installation of six asymmetric centers and the use of the Negishi reaction, Julia-Kocienski olefination, cross metathesis, HWE olefination and intermolecular Heck coupling for construction of a variety of unsaturated linkages. Pd(i)-based Heck coupling was introduced, for the first time to the best of our knowledge, quite efficiently to couple the major eastern and sensitive western segments of the molecule. The antibacterial activity of thailandamide lactone was also evaluated.
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Affiliation(s)
- Himangshu Sharma
- School of Chemical Sciences, Indian Association for the Cultivation of ScienceJadavpurKolkata-700032India
| | - Joyanta Mondal
- School of Chemical Sciences, Indian Association for the Cultivation of ScienceJadavpurKolkata-700032India
| | - Ananyo K. Ghosh
- School of Biological Sciences, Indian Association for the Cultivation of ScienceJadavpurKolkata-700032India
| | - Ritesh Ranjan Pal
- School of Biological Sciences, Indian Association for the Cultivation of ScienceJadavpurKolkata-700032India
| | - Rajib Kumar Goswami
- School of Chemical Sciences, Indian Association for the Cultivation of ScienceJadavpurKolkata-700032India
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4
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Liao S, Sun G, Wu S, Yang Z, Hu B, Liu Z, Qin J, Wang H, Wang Z. Efficient Synthesis of a Key Intermediate for Moxifloxacin Via Intramolecular Double Stereodifferentiation. Org Process Res Dev 2022. [DOI: 10.1021/acs.oprd.2c00183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Shouzhu Liao
- State Key Laboratory of Anti-Infective Drug Development (No. 2015DQ780357), Sunshine Lake Pharma Co., Ltd, Dongguan 523871, P. R. China
- Department of Process Research and Development, HEC Pharm Group, Dongguan 523871, P. R. China
| | - Guodong Sun
- Department of Process Research and Development, HEC Pharm Group, Dongguan 523871, P. R. China
| | - Shuming Wu
- State Key Laboratory of Anti-Infective Drug Development (No. 2015DQ780357), Sunshine Lake Pharma Co., Ltd, Dongguan 523871, P. R. China
- Department of Process Research and Development, HEC Pharm Group, Dongguan 523871, P. R. China
| | - Zaiyou Yang
- Department of Process Research and Development, HEC Pharm Group, Dongguan 523871, P. R. China
| | - Benquan Hu
- Department of Process Research and Development, HEC Pharm Group, Dongguan 523871, P. R. China
| | - Zhuangfeng Liu
- Department of Process Research and Development, HEC Pharm Group, Dongguan 523871, P. R. China
| | - Junhai Qin
- Department of Process Research and Development, HEC Pharm Group, Dongguan 523871, P. R. China
| | - Hailong Wang
- Department of Process Research and Development, HEC Pharm Group, Dongguan 523871, P. R. China
| | - Zhongqing Wang
- School of Pharmacy, Xiangnan University, Chenzhou 423000, Hunan, P. R. China
- State Key Laboratory of Anti-Infective Drug Development (No. 2015DQ780357), Sunshine Lake Pharma Co., Ltd, Dongguan 523871, P. R. China
- Department of Process Research and Development, HEC Pharm Group, Dongguan 523871, P. R. China
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5
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Shen SM, Appendino G, Guo YW. Pitfalls in the structural elucidation of small molecules. A critical analysis of a decade of structural misassignments of marine natural products. Nat Prod Rep 2022; 39:1803-1832. [PMID: 35770685 DOI: 10.1039/d2np00023g] [Citation(s) in RCA: 26] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Covering: July 2010 to August 2021This article summarizes more than 200 cases of misassigned marine natural products reported between July 2010 and August 2021, sorting out errors according to the structural elements. Based on a comparative analysis of the original and the revised structures, major pitfalls still plaguing the structural elucidation of small molecules were identified, emphasizing the role of total synthesis, crystallography, as well as chemical- and biosynthetic logic to complement spectroscopic data. Distinct "trends" in natural product misassignment are evident between compounds of marine and plant origin, with an overall much lower incidence of "impossible" structures within misassigned marine natural products.
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Affiliation(s)
- Shou-Mao Shen
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China. .,School of Chinese Materia Medica, Nanjing University of Chinese Medicine, Nanjing 210023, China
| | - Giovanni Appendino
- Dipartimento di Scienze del Farmaco, Universitá degli Studi del Piemonte Orientale, Largo Donegani 2, 28100 Novara, Italy
| | - Yue-Wei Guo
- State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, Shanghai 201203, China. .,Drug Discovery Shandong Laboratory, Bohai Rim Advanced Research Institute for Drug Discovery, Yantai, Shandong 264117, China
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6
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Auddy SS, Saha S, Goswami RK. Total synthesis and stereochemical assignment of bipolamide A acetate. Org Biomol Chem 2022; 20:3348-3358. [PMID: 35352738 DOI: 10.1039/d2ob00230b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Asymmetric total synthesis of an acetate analogue of the endophytic unstable secondary metabolite bipolamide A has been achieved for the first time adopting a convergent approach. The key feature of this synthesis includes Evans's asymmetric ethylation, Wittig olefination, Takai olefination, stereoselective Grignard addition and intermolecular Heck coupling. This eventually developed a synthetic route of the rarely found branched amine bearing an acyloin moiety. Our synthesis finally established unambiguously the stereochemistry of the unassigned C-8 center of the naturally occurring unstable bipolamide A.
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Affiliation(s)
- Sourya Shankar Auddy
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India.
| | - Sanu Saha
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India.
| | - Rajib Kumar Goswami
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India.
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7
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Bhamboo P, Bera S, Mondal D. TiCl
4
‐Promoted Asymmetric Aldol Reaction of Oxazolidinones and its Sulphur‐Congeners for Natural Product Synthesis. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100432] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Prateek Bhamboo
- School of Chemical Sciences Central University of Gujarat Gandhinagar 382030 Gujarat India
| | - Smritilekha Bera
- School of Chemical Sciences Central University of Gujarat Gandhinagar 382030 Gujarat India
| | - Dhananjoy Mondal
- School of Chemical Sciences Central University of Gujarat Gandhinagar 382030 Gujarat India
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8
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Paul D, Kundu A, Saha S, Goswami RK. Total synthesis: the structural confirmation of natural products. Chem Commun (Camb) 2021; 57:3307-3322. [DOI: 10.1039/d1cc00241d] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
This feature article highlights total synthesis as one of the reliable tools for the structural confirmation of natural products.
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Affiliation(s)
- Debobrata Paul
- School of Chemical Sciences
- Indian Association for the Cultivation of Science
- Kolkata 700032
- India
| | - Ashis Kundu
- School of Chemical Sciences
- Indian Association for the Cultivation of Science
- Kolkata 700032
- India
| | - Sanu Saha
- School of Chemical Sciences
- Indian Association for the Cultivation of Science
- Kolkata 700032
- India
| | - Rajib Kumar Goswami
- School of Chemical Sciences
- Indian Association for the Cultivation of Science
- Kolkata 700032
- India
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9
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Abstract
Total synthesis of marine secondary metabolite nafuredin B has been achieved for the first time using a convergent strategy. Sharpless epoxidation followed by acid catalyzed epoxide opening were adopted to install the tetrasubstituted hydroxy center, whereas the iterative Julia-Kocienski olefination, Wittig olefination and HWE olefination afforded the olefin bonds. Ring closing metathesis in the presence of a free tetrasubstituted hydroxy group provided the unsaturated δ-lactone moiety. This synthetic study provided unambiguous structural confirmation of the isolated nafuredin B.
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Affiliation(s)
- Gour Hari Mandal
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India.
| | - Dhiman Saha
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India.
| | - Rajib Kumar Goswami
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India.
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10
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Abstract
New structural classes of antibiotics are rare, structurally novel broad-spectrum antibiotics exceptionally so. The recently discovered baulamycins constitute a remarkable example of these highly prized compounds and, as such, have attracted considerable attention in the form of both synthetic efforts and biological studies. For the first time, we report a gram-scale preparation of the common carbon framework of the baulamycin family, as well as the total synthesis of its most potent member, baulamycin A. Our approach employs highly stereoselective, catalyst-controlled asymmetric conjugate additions to thioesters to set key stereocenters, as well as the first reported use of "dry ozonolysis" to reveal a masked carboxylic acid in the total synthesis of a natural product.
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Affiliation(s)
- Jonathan R Thielman
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States
| | - David H Sherman
- Life Sciences Institute, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Robert M Williams
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, United States.,University of Colorado Cancer Center, Aurora, Colorado 80045, USA
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11
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Mondal J, Sarkar R, Sen P, Goswami RK. Total Synthesis and Stereochemical Assignment of Sunshinamide and Its Anticancer Activity. Org Lett 2020; 22:1188-1192. [DOI: 10.1021/acs.orglett.0c00070] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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12
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Saha D, Guchhait S, Goswami RK. Total Synthesis and Stereochemical Assignment of Penicitide A. Org Lett 2020; 22:745-749. [DOI: 10.1021/acs.orglett.9b04585] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Dhiman Saha
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India
| | - Sandip Guchhait
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India
| | - Rajib Kumar Goswami
- School of Chemical Sciences, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India
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13
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Sun K, Tao C, Long B, Zeng X, Wu Z, Zhang R. Highly stereoselective gram scale synthesis of all the four diastereoisomers of Boc-protected 4-methylproline carboxylates. RSC Adv 2019; 9:32017-32020. [PMID: 35530808 PMCID: PMC9072942 DOI: 10.1039/c9ra06827a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Accepted: 09/29/2019] [Indexed: 11/28/2022] Open
Abstract
A general and practical synthetic process for all the four diastereoisomers of Boc-protected 4-methylproline carboxylates has been developed with essentially complete stereoselectivity on the gram scale, which represents the most diastereoselective preparation of 4-methylproline derivatives to date. This synthesis features an Evans asymmetric alkylation to elegantly establish the challenging stereochemistry of the 4-methyl group, providing valuable insights for the diastereoselective preparation of 4-substituted prolines.
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Affiliation(s)
- Kehuan Sun
- College of Traditional Chinese Medicine, Jinan University Guangzhou 510632 China
- The First Affiliated Hospital of Shenzhen University Shenzhen 518035 China
| | - Cheng Tao
- Integrated Chinese and Western Medicine Postdoctoral Research Station, Jinan University Guangzhou 510632 China
- The First Affiliated Hospital of Shenzhen University Shenzhen 518035 China
- Shenzhen Institute of Geriatric Medicine Shenzhen 518035 China
| | - Bohua Long
- The First Affiliated Hospital of Shenzhen University Shenzhen 518035 China
- Shenzhen Institute of Geriatric Medicine Shenzhen 518035 China
| | - Xiaobin Zeng
- Central Center Lab of Longhua Branch, Department of Infectious Disease, Shenzhen People's Hospital, 2nd Clinical Medical College of Jinan University Shenzhen 518120 Guangdong Province China
| | - Zhengzhi Wu
- The First Affiliated Hospital of Shenzhen University Shenzhen 518035 China
- Shenzhen Institute of Geriatric Medicine Shenzhen 518035 China
| | - Ronghua Zhang
- College of Traditional Chinese Medicine, Jinan University Guangzhou 510632 China
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14
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Diaz-Muñoz G, Miranda IL, Sartori SK, de Rezende DC, Alves Nogueira Diaz M. Use of chiral auxiliaries in the asymmetric synthesis of biologically active compounds: A review. Chirality 2019; 31:776-812. [PMID: 31418934 DOI: 10.1002/chir.23103] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2019] [Revised: 05/13/2019] [Accepted: 05/22/2019] [Indexed: 01/16/2023]
Abstract
This review article describes the use of some of the most popular chiral auxiliaries in the asymmetric synthesis of biologically active compounds. Chiral auxiliaries derived from naturally occurring compounds, such as amino acids, carbohydrates, and terpenes, are considered essential tools for the construction of highly complex molecules. We highlight the auxiliaries of Evans, Corey, Yamada, Enders, Oppolzer, and Kunz, which led to remarkable progress in asymmetric synthesis in the last decades and continue to bring advances until the present day.
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Affiliation(s)
- Gaspar Diaz-Muñoz
- Department of Chemistry, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Izabel Luzia Miranda
- Department of Chemistry, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Suélen Karine Sartori
- Department of Chemistry, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
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15
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Abstract
Covering: January to December 2017This review covers the literature published in 2017 for marine natural products (MNPs), with 740 citations (723 for the period January to December 2017) referring to compounds isolated from marine microorganisms and phytoplankton, green, brown and red algae, sponges, cnidarians, bryozoans, molluscs, tunicates, echinoderms, mangroves and other intertidal plants and microorganisms. The emphasis is on new compounds (1490 in 477 papers for 2017), together with the relevant biological activities, source organisms and country of origin. Reviews, biosynthetic studies, first syntheses, and syntheses that led to the revision of structures or stereochemistries, have been included. Geographic distributions of MNPs at a phylogenetic level are reported.
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Affiliation(s)
- Anthony R Carroll
- School of Environment and Science, Griffith University, Gold Coast, Australia. and Griffith Institute for Drug Discovery, Griffith University, Brisbane, Australia
| | - Brent R Copp
- School of Chemical Sciences, University of Auckland, Auckland, New Zealand
| | - Rohan A Davis
- Griffith Institute for Drug Discovery, Griffith University, Brisbane, Australia
| | - Robert A Keyzers
- Centre for Biodiscovery, School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington, New Zealand
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16
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Guchhait S, Goswami RK. Studies toward the synthesis of macrotermycin C: stereoselective construction of the acyclic skeleton of the aglycon. Org Biomol Chem 2019; 17:9502-9509. [DOI: 10.1039/c9ob01999e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first asymmetric synthesis of the acyclic skeleton of the aglycon of macrotermycin C has been achieved in 17 linear steps with 5.7% overall yield following a convergent approach.
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Affiliation(s)
- Sandip Guchhait
- School of Chemical Sciences
- Indian Association for the Cultivation of Science
- Kolkata-700032
- India
| | - Rajib Kumar Goswami
- School of Chemical Sciences
- Indian Association for the Cultivation of Science
- Kolkata-700032
- India
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17
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Chatterjee S, Mandal GH, Goswami RK. Total Synthesis of Cytospolide Q. ACS OMEGA 2018; 3:7350-7357. [PMID: 31458894 PMCID: PMC6644782 DOI: 10.1021/acsomega.8b00937] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Accepted: 06/21/2018] [Indexed: 06/10/2023]
Abstract
A flexible and convergent strategy for the stereoselective total synthesis of bioactive marine natural product cytospolide Q has been developed. The key features of this synthesis include Evans anti-aldol reaction for the installation of C-2 and C-3 stereocenters and cycloetherification via epoxide opening followed by concomitant lactonization for the construction of tetrahydrofuran and γ-butyrolactone scaffolds. This synthetic study also revealed that protected oxygenated functionality (methyl ester or benzyl ether) at C-1 position participated readily in epoxide opening.
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18
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Paul D, Saha S, Goswami RK. Total Synthesis of Pestalotioprolide E and Structural Revision of Pestalotioprolide F. Org Lett 2018; 20:4606-4609. [DOI: 10.1021/acs.orglett.8b01894] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Debobrata Paul
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India
| | - Sanu Saha
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India
| | - Rajib Kumar Goswami
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India
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19
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Steele AD, Ernouf G, Lee YE, Wuest WM. Diverted Total Synthesis of the Baulamycins and Analogues Reveals an Alternate Mechanism of Action. Org Lett 2018; 20:1126-1129. [PMID: 29388431 PMCID: PMC5869691 DOI: 10.1021/acs.orglett.8b00054] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The baulamycins were identified as in vitro siderophore biosynthesis inhibitors. Diverted total synthesis was used to construct the natural products and eight strategic analogues, three of which had improved inhibitory activity. Biological testing then revealed that membrane damage is the predominant mode of action in Staphylococcus aureus cells.
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Affiliation(s)
- Andrew D. Steele
- Department of Chemistry, Emory University, 1515 Dickey Drive Atlanta, Georgia 30322, United States
| | - Guillaume Ernouf
- Department of Chemistry, Emory University, 1515 Dickey Drive Atlanta, Georgia 30322, United States
| | - Young Eun Lee
- Department of Chemistry, Temple University, 1901 North 13th Street Philadelphia, Pennsylvania 19122, United States
| | - William M. Wuest
- Department of Chemistry, Emory University, 1515 Dickey Drive Atlanta, Georgia 30322, United States
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20
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Chatterjee S, Kuilya TK, Goswami RK. Studies Directed toward the Stereoselective Synthesis of Cytospolide E. ACS OMEGA 2018; 3:1041-1059. [PMID: 31457947 PMCID: PMC6641448 DOI: 10.1021/acsomega.7b01893] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Accepted: 01/15/2018] [Indexed: 06/10/2023]
Abstract
Our exhaustive effort toward the total synthesis of cytotoxic marine nonanolide cytospolide E has been detailed. To achieve this synthesis, we have explored both the ring-closing metathesis and lactonization-based macrocyclization strategies using a variety of precursors. Unfortunately, none of them provided the desired product. The ring-closing metathesis approach provided mainly the macrocycle with Z-olefin, whereas the macrolactonization strategy culminated in 8-epi-9-epi-cytospolide E following the regioselective formation of a 10-membered macrocycle over a 9-membered macrocycle.
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Affiliation(s)
- Shamba Chatterjee
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Tapan Kumar Kuilya
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Rajib Kumar Goswami
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
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21
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Kuilya TK, Das S, Saha D, Goswami RK. Studies toward the synthesis of strevertenes A and G: stereoselective construction of C1–C19segments of the molecules. Org Biomol Chem 2018; 16:7595-7608. [DOI: 10.1039/c8ob01754a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Efficient route for the stereoselective synthesis of common C1–C19segment of strevertenes A and G has been developed.
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Affiliation(s)
- Tapan Kumar Kuilya
- Department of Organic Chemistry
- Indian Association for the Cultivation of Science
- Kolkata-700032
- India
| | - Subhendu Das
- Department of Organic Chemistry
- Indian Association for the Cultivation of Science
- Kolkata-700032
- India
| | - Dhiman Saha
- Department of Organic Chemistry
- Indian Association for the Cultivation of Science
- Kolkata-700032
- India
| | - Rajib Kumar Goswami
- Department of Organic Chemistry
- Indian Association for the Cultivation of Science
- Kolkata-700032
- India
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22
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Heterocyclic Chiral Auxiliaries in Total Synthesis of Natural Products. TOPICS IN HETEROCYCLIC CHEMISTRY 2018. [DOI: 10.1007/7081_2018_26] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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23
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Sengupta S, Bae M, Oh DC, Dash U, Kim HJ, Song WY, Shin I, Sim T. Structural Revision of Baulamycin A and Structure-Activity Relationships of Baulamycin A Derivatives. J Org Chem 2017; 82:12947-12966. [PMID: 28903000 DOI: 10.1021/acs.joc.7b01719] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Total synthesis of the proposed structure of baulamycin A was performed. The spectral properties of the synthetic compound differ from those reported for the natural product. On the basis of comprehensive NMR study, we proposed two other possible structures for natural baulamycin A. Total syntheses of these two substances were performed, which enabled assignment of the correct structure of baulamycin A. Key features of the convergent and fully stereocontrolled route include Evans Aldol and Brown allylation reactions to construct the left fragment, a prolinol amide-derived alkylation/desymmetrization to install the methyl-substituted centers in the right fragment, and finally, a Carreira alkynylation to join both fragments. In addition, we have determined the inhibitory activities of novel baulamycin A derivatives against the enzyme SbnE. This SAR study provides useful insight into the design of novel SbnE inhibitors that overcome the drug resistance of pathogens, which cause life-threatening infections.
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Affiliation(s)
- Sandip Sengupta
- Chemical Kinomics Research Center, Korea Institute of Science and Technology (KIST) , 5 Hwarangro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea
| | - Munhyung Bae
- Natural Products Research Institute, College of Pharmacy, Seoul National University , 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Dong-Chan Oh
- Natural Products Research Institute, College of Pharmacy, Seoul National University , 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Uttam Dash
- Chemical Kinomics Research Center, Korea Institute of Science and Technology (KIST) , 5 Hwarangro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea
| | | | | | | | - Taebo Sim
- Chemical Kinomics Research Center, Korea Institute of Science and Technology (KIST) , 5 Hwarangro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea
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24
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25
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Lorenzo P, Butts CP, Myers EL, Aggarwal VK. The Story behind "Synergy of Synthesis, Computation, and NMR Reveals Correct Baulamycin Structures". Biochemistry 2017; 56:6177-6178. [PMID: 29125284 DOI: 10.1021/acs.biochem.7b00994] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Paula Lorenzo
- School of Chemistry, University of Bristol , Cantock's Close, Bristol BS8 1TS, U.K
| | - Craig P Butts
- School of Chemistry, University of Bristol , Cantock's Close, Bristol BS8 1TS, U.K
| | - Eddie L Myers
- School of Chemistry, University of Bristol , Cantock's Close, Bristol BS8 1TS, U.K
| | - Varinder K Aggarwal
- School of Chemistry, University of Bristol , Cantock's Close, Bristol BS8 1TS, U.K
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27
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Wu J, Lorenzo P, Zhong S, Ali M, Butts CP, Myers EL, Aggarwal VK. Synergy of synthesis, computation and NMR reveals correct baulamycin structures. Nature 2017; 547:436-440. [DOI: 10.1038/nature23265] [Citation(s) in RCA: 87] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2017] [Accepted: 05/31/2017] [Indexed: 11/09/2022]
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28
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Paladugu S, Mainkar PS, Chandrasekhar S. Synthesis of complete carbon framework of baulamycin A. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.06.011] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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29
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Paul D, Das S, Goswami RK. Total Synthesis of Pestalotioprolide G and Putative Structure of Pestalotioprolide H. J Org Chem 2017; 82:7437-7445. [DOI: 10.1021/acs.joc.7b01115] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Debobrata Paul
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India
| | - Sayantan Das
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India
| | - Rajib Kumar Goswami
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India
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30
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Abstract
A short and convergent strategy for the stereoselective total synthesis of biologically active natural product carolacton has been accomplished. Our synthesis highlights the Urpi acetal aldol, Crimmins aldol, Ireland-Claisen rearrangement, TiCl4-assisted aldol followed by β-hydroxy elimination to construct C7-C8 olefin, and ring-closing metathesis as the key steps for achieving the target molecule with an overall yield of 18.8%.
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Affiliation(s)
- Tapan Kumar Kuilya
- Department of Organic Chemistry, Indian Association for the Cultivation of Science , Jadavpur, Kolkata 700032, India
| | - Rajib Kumar Goswami
- Department of Organic Chemistry, Indian Association for the Cultivation of Science , Jadavpur, Kolkata 700032, India
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