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Elyashberg M, Novitskiy IM, Bates RW, Kutateladze AG, Williams CM. Reassignment of Improbable Natural Products Identified through Chemical Principle Screening. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200572] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Mikhail Elyashberg
- Advanced Chemistry Development Inc. (ACD/Labs) Toronto ON, M5C 1B5 Canada
| | - Ivan M. Novitskiy
- Department of Chemistry and Biochemistry University of Denver Denver CO 80208 United States
| | - Roderick W. Bates
- Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore 637371
| | - Andrei G. Kutateladze
- Department of Chemistry and Biochemistry University of Denver Denver CO 80208 United States
| | - Craig M. Williams
- School of Chemistry and Molecular Biosciences University of Queensland Brisbane 4072 Queensland Australia
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2
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Maslovskaya LA, Savchenko AI, Krenske EH, Chow S, Holt T, Gordon VA, Reddell PW, Pierce CJ, Parsons PG, Boyle GM, Kutateladze AG, Williams CM. EBC-232 and 323: A Structural Conundrum Necessitating Unification of Five In Silico Prediction and Elucidation Methods. Chemistry 2020; 26:11862-11867. [PMID: 32864777 DOI: 10.1002/chem.202001884] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Revised: 06/08/2020] [Indexed: 12/12/2022]
Abstract
Structurally unique halimanes EBC-232 and EBC-323, isolated from the Australian rainforest plant Croton insularis, proved considerably difficult to elucidate. The two diastereomers, which consist an unusual oxo-6,7-spiro ring system fused to a dihydrofuran, were solved by unification and consultation of five in silico NMR elucidation and prediction methods [i.e., ACDLabs, olefin strain energy (OSE), DP4, DU8+ and TD DFT CD]. Structure elucidation challenges of this nature are prime test case examples for empowering future AI learning in structure elucidation.
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Affiliation(s)
- Lidia A Maslovskaya
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, 4072, Australia.,QIMR Berghofer Medical Research Institute, PO Royal Brisbane Hospital, Brisbane, 4029, Australia
| | - Andrei I Savchenko
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, 4072, Australia
| | - Elizabeth H Krenske
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, 4072, Australia
| | - Sharon Chow
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, 4072, Australia
| | - Tina Holt
- Department of Chemistry and Biochemistry, University of Denver, Denver, CO, 80208, USA
| | - Victoria A Gordon
- EcoBiotics Limited, PO Box 1, Yungaburra, 4884, Queensland, Australia
| | - Paul W Reddell
- EcoBiotics Limited, PO Box 1, Yungaburra, 4884, Queensland, Australia
| | - Carly J Pierce
- QIMR Berghofer Medical Research Institute, PO Royal Brisbane Hospital, Brisbane, 4029, Australia
| | - Peter G Parsons
- QIMR Berghofer Medical Research Institute, PO Royal Brisbane Hospital, Brisbane, 4029, Australia
| | - Glen M Boyle
- QIMR Berghofer Medical Research Institute, PO Royal Brisbane Hospital, Brisbane, 4029, Australia
| | - Andrei G Kutateladze
- Department of Chemistry and Biochemistry, University of Denver, Denver, CO, 80208, USA
| | - Craig M Williams
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, 4072, Australia
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3
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Maslovskaya LA, Savchenko AI, Krenske EH, Chow S, Gordon VA, Reddell PW, Pierce CJ, Parsons PG, Boyle GM, Williams CM. EBC-342: A Novel Tetrahydrofuran Moiety Containing Casbane from the Australian Rainforest. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Lidia A. Maslovskaya
- School of Chemistry and Molecular Biosciences; University of Queensland; 4072 Brisbane Queensland Australia
- QIMR Berghofer Medical Research Institute; PO Royal Brisbane Hospital; 4029 Brisbane Queensland Australia
| | - Andrei I. Savchenko
- School of Chemistry and Molecular Biosciences; University of Queensland; 4072 Brisbane Queensland Australia
| | - Elizabeth H. Krenske
- School of Chemistry and Molecular Biosciences; University of Queensland; 4072 Brisbane Queensland Australia
| | - Sharon Chow
- School of Chemistry and Molecular Biosciences; University of Queensland; 4072 Brisbane Queensland Australia
| | | | - Paul W. Reddell
- EcoBiotics Limited; PO Box 1 4884 Yungaburra Queensland Australia
| | - Carly J. Pierce
- QIMR Berghofer Medical Research Institute; PO Royal Brisbane Hospital; 4029 Brisbane Queensland Australia
| | - Peter G. Parsons
- QIMR Berghofer Medical Research Institute; PO Royal Brisbane Hospital; 4029 Brisbane Queensland Australia
| | - Glen M. Boyle
- QIMR Berghofer Medical Research Institute; PO Royal Brisbane Hospital; 4029 Brisbane Queensland Australia
| | - Craig M. Williams
- School of Chemistry and Molecular Biosciences; University of Queensland; 4072 Brisbane Queensland Australia
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4
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Maslovskaya LA, Savchenko AI, Gordon VA, Reddell PW, Pierce CJ, Boyle GM, Parsons PG, Williams CM. New Halimanes from the Australian Rainforest Plant Croton Insularis. European J Org Chem 2019. [DOI: 10.1002/ejoc.201801548] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Lidia A. Maslovskaya
- School of Chemistry and Molecular Biosciences; University of; 4072 Brisbane Queensland Australia
- QIMR Berghofer Medical Research Institute; PO Royal Brisbane Hospital; 4029 Brisbane Queensland Australia
| | - Andrei I. Savchenko
- School of Chemistry and Molecular Biosciences; University of; 4072 Brisbane Queensland Australia
| | | | - Paul W. Reddell
- EcoBiotics Limited; PO Box 1 4884 Yungaburra Queensland Australia
| | - Carly J. Pierce
- QIMR Berghofer Medical Research Institute; PO Royal Brisbane Hospital; 4029 Brisbane Queensland Australia
| | - Glen M. Boyle
- QIMR Berghofer Medical Research Institute; PO Royal Brisbane Hospital; 4029 Brisbane Queensland Australia
| | - Peter G. Parsons
- QIMR Berghofer Medical Research Institute; PO Royal Brisbane Hospital; 4029 Brisbane Queensland Australia
| | - Craig M. Williams
- School of Chemistry and Molecular Biosciences; University of; 4072 Brisbane Queensland Australia
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5
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Maslovskaya LA, Savchenko AI, Pierce CJ, Boyle GM, Gordon VA, Reddell PW, Parsons PG, Williams CM. New Casbanes and the First trans
-Cyclopropane seco
-Casbane from the Australian Rainforest Plant Croton insularis. Chemistry 2019; 25:1525-1534. [DOI: 10.1002/chem.201804904] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2018] [Revised: 10/28/2018] [Indexed: 01/30/2023]
Affiliation(s)
- Lidiya A. Maslovskaya
- School of Chemistry and Molecular Biosciences; University of Queensland; Brisbane 4072 Queensland Australia
- QIMR Berghofer Medical Research Institute; PO Royal Brisbane Hospital; 4029 Queensland Australia
| | - Andrei I. Savchenko
- School of Chemistry and Molecular Biosciences; University of Queensland; Brisbane 4072 Queensland Australia
| | - Carly J. Pierce
- QIMR Berghofer Medical Research Institute; PO Royal Brisbane Hospital; 4029 Queensland Australia
| | - Glen M. Boyle
- QIMR Berghofer Medical Research Institute; PO Royal Brisbane Hospital; 4029 Queensland Australia
| | | | - Paul W. Reddell
- EcoBiotics Limited; P.O. Box 1 Yungaburra 4884 Queensland Australia
| | - Peter G. Parsons
- QIMR Berghofer Medical Research Institute; PO Royal Brisbane Hospital; 4029 Queensland Australia
| | - Craig M. Williams
- School of Chemistry and Molecular Biosciences; University of Queensland; Brisbane 4072 Queensland Australia
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6
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Tan YP, Savchenko AI, Broit N, Boyle GM, Parsons PG, Williams CM. The First Plant 5,6-Secosteroid from the Australian Arid Zone SpeciesFrankenia foliosa. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700035] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Yuen P. Tan
- School of Chemistry and Molecular Biosciences; University of Queensland; 4072 Brisbane Queensland Australia
| | - Andrei I. Savchenko
- School of Chemistry and Molecular Biosciences; University of Queensland; 4072 Brisbane Queensland Australia
| | - Natasa Broit
- PO Royal Brisbane Hospital; QIMR Berghofer Medical Research Institute; 4029 Brisbane Queensland Australia
| | - Glen M. Boyle
- PO Royal Brisbane Hospital; QIMR Berghofer Medical Research Institute; 4029 Brisbane Queensland Australia
| | - Peter G. Parsons
- PO Royal Brisbane Hospital; QIMR Berghofer Medical Research Institute; 4029 Brisbane Queensland Australia
| | - Craig M. Williams
- School of Chemistry and Molecular Biosciences; University of Queensland; 4072 Brisbane Queensland Australia
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7
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Maslovskaya LA, Savchenko AI, Gordon VA, Reddell PW, Pierce CJ, Parsons PG, Williams CM. The First Casbane Hydroperoxides EBC-304 and EBC-320 from the Australian Rainforest. Chemistry 2016; 23:537-540. [DOI: 10.1002/chem.201604674] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2016] [Indexed: 01/30/2023]
Affiliation(s)
- Lidiya A. Maslovskaya
- School of Chemistry and Molecular Biosciences; University of Queensland; Brisbane 4072 Australia
- QIMR Berghofer Medical Research Institute; PO Royal Brisbane Hospital; Brisbane 4029, Queensland Australia
| | - Andrei I. Savchenko
- School of Chemistry and Molecular Biosciences; University of Queensland; Brisbane 4072 Australia
| | | | - Paul W. Reddell
- EcoBiotics Limited, PO Box 1; Yungaburra 4884, Queensland Australia
| | - Carly J. Pierce
- QIMR Berghofer Medical Research Institute; PO Royal Brisbane Hospital; Brisbane 4029, Queensland Australia
| | - Peter G. Parsons
- QIMR Berghofer Medical Research Institute; PO Royal Brisbane Hospital; Brisbane 4029, Queensland Australia
| | - Craig M. Williams
- School of Chemistry and Molecular Biosciences; University of Queensland; Brisbane 4072 Australia
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8
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Krenske EH, Williams CM. Do Anti-Bredt Natural Products Exist? Olefin Strain Energy as a Predictor of Isolability. Angew Chem Int Ed Engl 2015; 54:10608-12. [PMID: 26235843 DOI: 10.1002/anie.201503822] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2015] [Indexed: 01/29/2023]
Abstract
Bredt's rule holds a special place in the realm of physical organic chemistry, but its application to natural products chemistry—the field in which the rule was originally formulated—is not well defined. Herein, the use of olefin strain (OS) energy as a readily calculated predictor of the stability of natural products containing a bridgehead alkene is introduced. Schleyer first used OS energies to classify parent bridgehead alkenes into "isolable", "observable", and "unstable" classes. OS calculations on natural products, using contemporary forcefield methods, unequivocally predict all structurally verified bridgehead alkene natural products to be "isolable". Thus, when one assigns the structure of a putative bridgehead alkene natural product, an OS in the "observable" or "unstable" ranges is a red flag for error.
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Affiliation(s)
- Elizabeth H Krenske
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, 4072, Queensland (Australia) http://www.scmb.uq.edu.au/homepages/williams/index.html.
| | - Craig M Williams
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, 4072, Queensland (Australia) http://www.scmb.uq.edu.au/homepages/williams/index.html.
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9
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Krenske EH, Williams CM. Do Anti-Bredt Natural Products Exist? Olefin Strain Energy as a Predictor of Isolability. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201503822] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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10
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Jian YQ, Huang XJ, Zhang DM, Jiang RW, Chen MF, Zhao BX, Wang Y, Ye WC. Guapsidial A and Guadials B and C: Three New Meroterpenoids with Unusual Skeletons from the Leaves of Psidium guajava. Chemistry 2015; 21:9022-7. [PMID: 25965842 DOI: 10.1002/chem.201500533] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2015] [Indexed: 11/06/2022]
Abstract
A novel sesquiterpene-based Psidium meroterpenoid, possessing an unusual coupling pattern, and two new monoterpene-based meroterpenoids with unprecedented skeletons were isolated from the leaves of Psidium guajava. Their structures and absolute configurations were elucidated by spectroscopic, X-ray diffraction, and computational methods. The plausible biosynthetic pathway of these meroterpenoids as well as their cytotoxicities toward HepG2 and HepG2/ADM cells were also discussed.
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Affiliation(s)
- Yu-Qing Jian
- Institute of Traditional Chinese Medicine & Natural Products, College of Pharmacy, Jinan University, Guangzhou 510632 (P.R. China), Fax: (+86) 20-8522-1559.,JNU-HKUST Joint Laboratory for Neuroscience & Innovative Drug Research, Jinan University, Guangzhou 510632 (P.R. China)
| | - Xiao-Jun Huang
- Institute of Traditional Chinese Medicine & Natural Products, College of Pharmacy, Jinan University, Guangzhou 510632 (P.R. China), Fax: (+86) 20-8522-1559.,JNU-HKUST Joint Laboratory for Neuroscience & Innovative Drug Research, Jinan University, Guangzhou 510632 (P.R. China)
| | - Dong-Mei Zhang
- Institute of Traditional Chinese Medicine & Natural Products, College of Pharmacy, Jinan University, Guangzhou 510632 (P.R. China), Fax: (+86) 20-8522-1559
| | - Ren-Wang Jiang
- Institute of Traditional Chinese Medicine & Natural Products, College of Pharmacy, Jinan University, Guangzhou 510632 (P.R. China), Fax: (+86) 20-8522-1559
| | - Min-Feng Chen
- Institute of Traditional Chinese Medicine & Natural Products, College of Pharmacy, Jinan University, Guangzhou 510632 (P.R. China), Fax: (+86) 20-8522-1559.,JNU-HKUST Joint Laboratory for Neuroscience & Innovative Drug Research, Jinan University, Guangzhou 510632 (P.R. China)
| | - Bing-Xin Zhao
- Institute of Traditional Chinese Medicine & Natural Products, College of Pharmacy, Jinan University, Guangzhou 510632 (P.R. China), Fax: (+86) 20-8522-1559.,JNU-HKUST Joint Laboratory for Neuroscience & Innovative Drug Research, Jinan University, Guangzhou 510632 (P.R. China)
| | - Ying Wang
- Institute of Traditional Chinese Medicine & Natural Products, College of Pharmacy, Jinan University, Guangzhou 510632 (P.R. China), Fax: (+86) 20-8522-1559. .,JNU-HKUST Joint Laboratory for Neuroscience & Innovative Drug Research, Jinan University, Guangzhou 510632 (P.R. China).
| | - Wen-Cai Ye
- Institute of Traditional Chinese Medicine & Natural Products, College of Pharmacy, Jinan University, Guangzhou 510632 (P.R. China), Fax: (+86) 20-8522-1559. .,JNU-HKUST Joint Laboratory for Neuroscience & Innovative Drug Research, Jinan University, Guangzhou 510632 (P.R. China).
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11
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Mak JYW, Pouwer RH, Williams CM. Naturstoffe mit Anti-Bredt- und Brückenkopf-Doppelbindung. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201400932] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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12
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Mak JYW, Pouwer RH, Williams CM. Natural products with anti-Bredt and bridgehead double bonds. Angew Chem Int Ed Engl 2014; 53:13664-88. [PMID: 25399486 DOI: 10.1002/anie.201400932] [Citation(s) in RCA: 81] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2014] [Revised: 04/25/2014] [Indexed: 11/11/2022]
Abstract
Well over a hundred years ago, Professor Julius Bredt embarked on a career pursuing and critiquing bridged bicyclic systems that contained ring strain induced by the presence of a bridgehead olefin. These endeavors founded what we now know as Bredt's rule (Bredtsche Regel). Physical, theoretical, and synthetic organic chemists have intensely studied this premise, pushing the boundaries of such systems to arrive at a better understood physical phenomenon. Mother nature has also seen fit to construct molecules containing bridgehead double bonds that encompass Bredt's rule. For the first time, this topic is reviewed in a natural product context.
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Affiliation(s)
- Jeffrey Y W Mak
- Institute for Molecular Bioscience, The University of Queensland, Brisbane (Australia)
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Maslovskaya LA, Savchenko AI, Pierce CJ, Gordon VA, Reddell PW, Parsons PG, Williams CM. Unprecedented 1,14-seco-crotofolanes from Croton insularis: oxidative cleavage of crotofolin C by a putative homo-Baeyer-Villiger rearrangement. Chemistry 2014; 20:14226-30. [PMID: 25233878 DOI: 10.1002/chem.201404250] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2014] [Indexed: 01/30/2023]
Abstract
EBC-162 isolated from Croton insularis, obtained from the northern rainforest of Australia, was structurally affirmed as crotofolin C (4). Novel oxidative degradation products, EBC-233 and EBC-300, which are the first crotofolane endoperoxides, were also isolated. Both endoperoxides were found to be stable intermediates, which are proposed to undergo an unprecedented homo-Baeyer-Villiger biosynthetic rearrangement to give a new class of 1,14-seco-crotofolane diterpenes. Prolonged storage of all isolates assisted in authenticating their natural product status. Anticancer activities of reported compounds are presented.
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Affiliation(s)
- Lidiya A Maslovskaya
- QIMR Berghofer Medical Research Institute, PO Royal Brisbane Hospital, Brisbane, 4029, Queensland (Australia)
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