1
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Chennamsetti H, Rathore KS, Chatterjee S, Mandal PK, Katukojvala S. Triple Nucleophilic Head-to-Tail Cascade Polycyclization of Diazodienals via Combination Catalysis: Direct Access to Cyclopentane Fused Aza-Polycycles with Six-Contiguous Stereocenters. JACS AU 2024; 4:2099-2107. [PMID: 38938806 PMCID: PMC11200238 DOI: 10.1021/jacsau.4c00134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/14/2024] [Revised: 04/15/2024] [Accepted: 04/15/2024] [Indexed: 06/29/2024]
Abstract
Reported herein are the bench stable (2E,4E)-diazohexa-2,4-dienals (diazodienals) and their unprecedented polycyclization with aldimine and arylamines enabled by Rh(II)/Brønsted acid relay catalysis. This scalable and atom-economical reaction provides direct access to the biologically important azatricyclo[6.2.1.04,11]undecane fused polycycles having six-contiguous stereocenters. Mechanistic studies revealed that polycyclization proceeds through an unusual triple-nucleophilic cascade initiated by aldimine attack on remote Rh-carbenoid, 6π-electrocyclization of aza-trienyl azomethine ylide, stereoselective aza-Michael addition via iminium activation, and inverse electron-demand intramolecular aza Diels-Alder reaction. The π-π secondary interactions play a crucial role in the preorganization of reactive intermediates for the pericyclic reactions and, hence, the overall efficiency of the polycyclization.
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Affiliation(s)
| | | | | | | | - Sreenivas Katukojvala
- Department of Chemistry, Indian
Institute of Science Education & Research
Bhopal, Bhopal, Madhya Pradesh 462066, India
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2
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Gong D, Li B, Wu B, Fu D, Li Z, Wei H, Guo S, Ding G, Wang B. The Integration of the Metabolome and Transcriptome for Dendrobium nobile Lindl. in Response to Methyl Jasmonate. Molecules 2023; 28:7892. [PMID: 38067620 PMCID: PMC10707931 DOI: 10.3390/molecules28237892] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 11/23/2023] [Accepted: 11/28/2023] [Indexed: 12/18/2023] Open
Abstract
Dendrobium nobile Lindl., as an endangered medicinal plant within the genus Dendrobium, is widely distributed in southwestern China and has important ecological and economic value. There are a variety of metabolites with pharmacological activity in D. nobile. The alkaloids and polysaccharides contained within D. nobile are very important active components, which mainly have antiviral, anti-tumor, and immunity improvement effects. However, the changes in the compounds and functional genes of D. nobile induced by methyl jasmonate (MeJA) are not clearly understood. In this study, the metabolome and transcriptome of D. nobile were analyzed after exposure to MeJA. A total of 377 differential metabolites were obtained through data analysis, of which 15 were related to polysaccharide pathways and 35 were related to terpenoids and alkaloids pathways. Additionally, the transcriptome sequencing results identified 3256 differentially expressed genes that were discovered in 11 groups. Compared with the control group, 1346 unigenes were differentially expressed in the samples treated with MeJA for 14 days (TF14). Moreover, the expression levels of differentially expressed genes were also significant at different growth and development stages. According to GO and KEGG annotations, 189 and 99 candidate genes were identified as being involved in terpenoid biosynthesis and polysaccharide biosynthesis, respectively. In addition, the co-expression analysis indicated that 238 and 313 transcription factors (TFs) may contribute to the regulation of terpenoid and polysaccharide biosynthesis, respectively. Through a heat map analysis, fourteen terpenoid synthetase genes, twenty-three cytochrome P450 oxidase genes, eight methyltransferase genes, and six aminotransferase genes were identified that may be related to dendrobine biosynthesis. Among them, one sesquiterpene synthase gene was found to be highly expressed after the treatment with MeJA and was positively correlated with the content of dendrobine. This study provides important and valuable metabolomics and transcriptomic information for the further understanding of D. nobile at the metabolic and molecular levels and provides candidate genes and possible intermediate compounds for the dendrobine biosynthesis pathway, which lays a certain foundation for further research on and application of Dendrobium.
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Affiliation(s)
- Daoyong Gong
- College of Bioengineering, Chongqing University, Chongqing 400045, China;
- Institute of Medicinal Plant Development, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing 100193, China; (B.W.); (H.W.); (S.G.); (G.D.)
| | - Biao Li
- Institute of Medicinal Plant Development, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing 100193, China; (B.W.); (H.W.); (S.G.); (G.D.)
| | - Bin Wu
- Institute of Medicinal Plant Development, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing 100193, China; (B.W.); (H.W.); (S.G.); (G.D.)
| | - Deru Fu
- Steinhardt School of Culture, Education, and Human Development, New York University, New York, NY 10003, USA;
| | - Zesheng Li
- Dehong Tropical Agriculture Research Institute of Yunnan, Ruili 678600, China;
| | - Haobo Wei
- Institute of Medicinal Plant Development, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing 100193, China; (B.W.); (H.W.); (S.G.); (G.D.)
- School of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu 611137, China
| | - Shunxing Guo
- Institute of Medicinal Plant Development, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing 100193, China; (B.W.); (H.W.); (S.G.); (G.D.)
| | - Gang Ding
- Institute of Medicinal Plant Development, Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing 100193, China; (B.W.); (H.W.); (S.G.); (G.D.)
| | - Bochu Wang
- College of Bioengineering, Chongqing University, Chongqing 400045, China;
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3
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Shi QQ, Tang JJ, Gao JM. Picrotoxane sesquiterpenoids: chemistry, chemo- and bio-syntheses and biological activities. Nat Prod Rep 2022; 39:2096-2131. [PMID: 36106498 DOI: 10.1039/d2np00049k] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Covering: up to December 2021Picrotoxane sesquiterpenoids are a special category of natural products known to have a picrotoxane skeleton and are characterised by a highly oxidised cis-hydrindene core, lactone rings, and epoxide functionalities. Ever since the first picrotoxane was isolated from Menispermum cocculus in the early 19th century, these compounds have long attracted the attention of natural product chemists, synthetic chemists, and pharmacologists for their particular structures and powerful biological activities. This review extensively summarizes a total of 132 naturally occurring picrotoxane sesquiterpenoids, taking into account their distributions, structural classifications, chemical and bio-synthetic researches, and bioactivities. It provides a comprehensive and in-depth perspective for further investigation on picrotoxane sesquiterpenoids.
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Affiliation(s)
- Qiang-Qiang Shi
- Shaanxi Key Laboratory of Natural Products & Chemical Biology, College of Chemistry & Pharmacy, Northwest A&F University, 22 Xinong Road, Yangling 712100, Shaanxi, People's Republic of China.
| | - Jiang-Jiang Tang
- Shaanxi Key Laboratory of Natural Products & Chemical Biology, College of Chemistry & Pharmacy, Northwest A&F University, 22 Xinong Road, Yangling 712100, Shaanxi, People's Republic of China.
| | - Jin-Ming Gao
- Shaanxi Key Laboratory of Natural Products & Chemical Biology, College of Chemistry & Pharmacy, Northwest A&F University, 22 Xinong Road, Yangling 712100, Shaanxi, People's Republic of China.
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4
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Ikeuchi K, Haraguchi S, Yamada H, Tanino K. Model Synthetic Study of Tutin, a Picrotoxane-Type Sesquiterpene: Stereoselective Construction of a cis-Fused 5,6-Ring Skeleton. Chem Pharm Bull (Tokyo) 2022; 70:435-442. [PMID: 35650040 DOI: 10.1248/cpb.c22-00083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Picrotoxinin, coriamyrtin, and tutin are representative natural products classified as picrotoxane-type sesquiterpenes and they function as strong neurotoxins. Because they possess a cis-fused 5,6-ring skeleton with a highly congested functionalization, organic chemistry researchers have pursued the development of a stereoselective synthesis method for such skeleton. This study aims to stereoselectively synthesize the cis-fused 5,6-ring skeleton with two tetrasubstituted carbons at both angular positions using a model compound. The results revealed that the desymmetrization of the 2-methyl-1,3-cyclopentanedione moiety via the DL-proline-mediated intramolecular aldol reaction of a pentanal derivative bearing an isopropenyl group and the five-membered ring at the 3- and 5-position, respectively, provided the desired cis-fused skeleton. This reaction can construct four contiguous stereogenic centers of the bicyclic skeleton with the two angular positions in good yield with high stereoselectivity. Further, this reaction was applied to the kinetic resolution of the racemate using L-proline, providing the enantiomeric pure aldol product with the desired skeleton. This method can be utilized for total synthesis of picrotoxane-type sesquiterpenes.
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5
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Xiao J, Peng Y, Li WDZ. Advances on the Total Synthesis of Sesquiterpenoid Alkaloid Dendrobine. CHINESE J ORG CHEM 2021. [DOI: 10.6023/cjoc202101041] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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6
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Cao J, Thor W, Yang S, Zhang M, Bao W, Zhu L, Yang W, Cheng YK, Lee CS. Synthesis of the Tricyclic Picrotoxane Motif by an Oxidative Cascade Cyclization. Org Lett 2019; 21:4896-4899. [PMID: 31188619 DOI: 10.1021/acs.orglett.9b01806] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An oxidative cascade cyclization of β-keto esters has been developed for the construction of the tricyclic picrotoxane motif in a single step, and DFT calculations suggested a possible cationic cyclization mechanism. This cascade cyclization can be operated on a 20 g scale to obtain a 77% total yield of the tricyclic products, which in turn can be converted to versatile intermediates for further elaboration to picrotoxanes and their structurally related compounds.
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Affiliation(s)
- Jingming Cao
- State Key Laboratory of Chemical Oncogenomics , Peking University Shenzhen Graduate School , Shenzhen University Town, Xili, Shenzhen 518055 , China
| | - Waygen Thor
- Department of Chemistry , Hong Kong Baptist University , Kowloon Tong , Hong Kong SAR , China
| | - Shenkun Yang
- State Key Laboratory of Chemical Oncogenomics , Peking University Shenzhen Graduate School , Shenzhen University Town, Xili, Shenzhen 518055 , China
| | - Mengxun Zhang
- State Key Laboratory of Chemical Oncogenomics , Peking University Shenzhen Graduate School , Shenzhen University Town, Xili, Shenzhen 518055 , China
| | - Wenli Bao
- State Key Laboratory of Chemical Oncogenomics , Peking University Shenzhen Graduate School , Shenzhen University Town, Xili, Shenzhen 518055 , China
| | - Lizhi Zhu
- State Key Laboratory of Chemical Oncogenomics , Peking University Shenzhen Graduate School , Shenzhen University Town, Xili, Shenzhen 518055 , China.,Institute of Translational Medicine, Shenzhen Second People's Hospital , The First Affiliated Hospital of Shenzhen University, Health Science Centre , Shenzhen 518035 , China
| | - Wei Yang
- State Key Laboratory of Chemical Oncogenomics , Peking University Shenzhen Graduate School , Shenzhen University Town, Xili, Shenzhen 518055 , China
| | - Yuen-Kit Cheng
- Department of Chemistry , Hong Kong Baptist University , Kowloon Tong , Hong Kong SAR , China
| | - Chi-Sing Lee
- State Key Laboratory of Chemical Oncogenomics , Peking University Shenzhen Graduate School , Shenzhen University Town, Xili, Shenzhen 518055 , China.,Department of Chemistry , Hong Kong Baptist University , Kowloon Tong , Hong Kong SAR , China.,Institute for Research and Continuing Edition (Shenzhen) , Hong Kong Baptist University , Industrialization Complex Building, Shenzhen Virtual University Park, Shenzhen 518000 , China
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7
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Leon RM, Ravi D, An JS, del Genio CL, Rheingold AL, Gaur AB, Micalizio GC. Synthesis of C14-Desmethylene Corialactone D and Discovery of Inhibitors of Nerve Growth Factor Mediated Neurite Outgrowth. Org Lett 2019; 21:3193-3197. [PMID: 30995050 PMCID: PMC8420866 DOI: 10.1021/acs.orglett.9b00921] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
An asymmetric synthesis of C14-desmethylene corialactone D is described on the basis of strategic application of a metallacycle-mediated annulative cross-coupling reaction, a Still [2,3]-Wittig rearrangement, and Morken's hydroxyl-directed diboration reaction. While representing a convenient approach to access novel compositions of matter inspired by the sesquiterpenoid natural product class (including classic natural product synthesis targets including the picrotaxanes and dendrobine), these studies have led to the discovery of natural product-inspired agents that inhibit nerve growth factor (NGF)-mediated neurite outgrowth in PC-12 cells.
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Affiliation(s)
- Robert M. Leon
- Department of Chemistry, Dartmouth College, Burke Laboratory, Hanover, New Hampshire 03755, United States
| | - Divya Ravi
- Dartmouth College, Geisel School of Medicine, Lebanon, New Hampshire 03756, United States
| | - Jennifer S. An
- Dartmouth College, Geisel School of Medicine, Lebanon, New Hampshire 03756, United States
| | - Carmen L. del Genio
- Dartmouth College, Geisel School of Medicine, Lebanon, New Hampshire 03756, United States
| | - Arnold L. Rheingold
- Department of Chemistry, University of California—San Diego, La Jolla, California 92093, United States
| | - Arti B. Gaur
- Dartmouth College, Geisel School of Medicine, Lebanon, New Hampshire 03756, United States
| | - Glenn C. Micalizio
- Department of Chemistry, Dartmouth College, Burke Laboratory, Hanover, New Hampshire 03755, United States
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8
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9
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Guo L, Frey W, Plietker B. Catalytic Enantioselective Total Synthesis of the Picrotoxane Alkaloids (-)-Dendrobine, (-)-Mubironine B, and (-)-Dendroxine. Org Lett 2018; 20:4328-4331. [PMID: 29975054 DOI: 10.1021/acs.orglett.8b01782] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A concise enantioselective total synthesis of three sesquiterpenoid alkaloids-(-)-dendrobine, (-)-mubironine B, and (-)-dendroxine-is presented, which highlights the state-of-art catalytic methods, including enantioselective Diels-Alder cycloaddition, iron-catalyzed aerobic lactonization, copper-catalyzed cycloisomerization, and free-radical-initiated hydroazidation.
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Affiliation(s)
- Lei Guo
- Institut für Organische Chemie , Universität Stuttgart , Pfaffenwaldring 55 , DE-70569 Stuttgart , Germany
| | - Wolfgang Frey
- Institut für Organische Chemie , Universität Stuttgart , Pfaffenwaldring 55 , DE-70569 Stuttgart , Germany
| | - Bernd Plietker
- Institut für Organische Chemie , Universität Stuttgart , Pfaffenwaldring 55 , DE-70569 Stuttgart , Germany
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10
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Williams BM, Trauner D. Azomethine Ylide Cycloaddition Approach toward Dendrobine: Synthesis of 5-Deoxymubironine C. J Org Chem 2018; 83:3061-3068. [PMID: 29490142 DOI: 10.1021/acs.joc.8b00192] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A concise route to the azatricyclo[6.2.1.04,11]undecane core of (-)-dendrobine and (-)-mubironine C is described wherein an unstabilized azomethine ylide cycloaddition provides the complete carbon framework of the natural products. The cyclization precursor is made in short order from ( R)-carvone through an unconventional high-pressure Ireland-Claisen reaction. Attempts to install a final hydroxyl group through an intramolecular lactonization strategy and the observation of an unexpected and highly complex enal-ene product are also reported.
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Affiliation(s)
- Benjamin M Williams
- Department of Chemistry Ludwig-Maximilians-Universität München Butenandtstrasse 5-13 , 81377 München , Germany
| | - Dirk Trauner
- Department of Chemistry Ludwig-Maximilians-Universität München Butenandtstrasse 5-13 , 81377 München , Germany.,Department of Chemistry , New York University 100 Washington Square East, Room 712 New York , New York 10003 , United States
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11
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Lee Y, Rochette EM, Kim J, Chen DYK. An Asymmetric Pathway to Dendrobine by a Transition-Metal-Catalyzed Cascade Process. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201705713] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Yujin Lee
- Department of Chemistry; Seoul National University; Gwanak-1 Gwanak-ro, Gwanak-gu Seoul 151-742 South Korea
| | - Elise M. Rochette
- Department of Chemistry; Seoul National University; Gwanak-1 Gwanak-ro, Gwanak-gu Seoul 151-742 South Korea
| | - Junyong Kim
- Department of Chemistry; Seoul National University; Gwanak-1 Gwanak-ro, Gwanak-gu Seoul 151-742 South Korea
| | - David Y.-K. Chen
- Department of Chemistry; Seoul National University; Gwanak-1 Gwanak-ro, Gwanak-gu Seoul 151-742 South Korea
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12
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Lee Y, Rochette EM, Kim J, Chen DYK. An Asymmetric Pathway to Dendrobine by a Transition-Metal-Catalyzed Cascade Process. Angew Chem Int Ed Engl 2017; 56:12250-12254. [DOI: 10.1002/anie.201705713] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2017] [Indexed: 11/10/2022]
Affiliation(s)
- Yujin Lee
- Department of Chemistry; Seoul National University; Gwanak-1 Gwanak-ro, Gwanak-gu Seoul 151-742 South Korea
| | - Elise M. Rochette
- Department of Chemistry; Seoul National University; Gwanak-1 Gwanak-ro, Gwanak-gu Seoul 151-742 South Korea
| | - Junyong Kim
- Department of Chemistry; Seoul National University; Gwanak-1 Gwanak-ro, Gwanak-gu Seoul 151-742 South Korea
| | - David Y.-K. Chen
- Department of Chemistry; Seoul National University; Gwanak-1 Gwanak-ro, Gwanak-gu Seoul 151-742 South Korea
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13
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Nawrat CC, Moody CJ. Quinones as Dienophiles in the Diels-Alder Reaction: History and Applications in Total Synthesis. Angew Chem Int Ed Engl 2014; 53:2056-77. [DOI: 10.1002/anie.201305908] [Citation(s) in RCA: 109] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2013] [Indexed: 01/24/2023]
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14
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Nawrat CC, Moody CJ. Chinone als Dienophile in der Diels-Alder-Reaktion - historische Entwicklung und Anwendungen in der Totalsynthese. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201305908] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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15
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16
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Kreis LM, Carreira EM. Total synthesis of (-)-dendrobine. Angew Chem Int Ed Engl 2012; 51:3436-9. [PMID: 22344999 DOI: 10.1002/anie.201108564] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2011] [Revised: 01/09/2012] [Indexed: 11/07/2022]
Abstract
Cascading to alkaloids: an 18-step total synthesis of (-)-dendrobine is based on a reaction cascade with a key amine group. The amine is the initiator of the cascade and provides an efficient method for installing the stereocenters at C11 and C3. The overall transformation occurs stereoselectively only when the conversion is carried out without the isolation of intermediates.
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Affiliation(s)
- Lukas M Kreis
- Laboratorium für Organische Chemie, ETH Zürich, Switzerland
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17
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Affiliation(s)
- Edda Gössinger
- Institut für Organische Chemie der Universität Wien, Währinger Strasse 38, 1090, Vienna, Austria.
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18
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Padwa A, Brodney MA, Dimitroff M, Liu B, Wu T. Application of furanyl carbamate cycloadditions toward the synthesis of hexahydroindolinone alkaloids. J Org Chem 2001; 66:3119-28. [PMID: 11325277 DOI: 10.1021/jo010020z] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A convenient synthesis of various substituted hexahydroindolinones has been achieved by an intramolecular Diels--Alder cycloaddition reaction (IMDAF) of furanyl carbamates bearing tethered alkenyl groups. The initially formed [4 + 2]-cycloadduct undergoes nitrogen-assisted ring opening followed by deprotonation of the resulting zwitterion to give the rearranged ketone. The stereochemical outcome of the IMDAF cycloaddition has the sidearm of the tethered alkenyl group oriented syn with respect to the oxygen bridge. A synthetic route to (+/-)-mesembrane and (+/-)-crinane was accomplished using this methodology. It was possible to carry out a stereoselective reduction of the initially formed hexahydroindolinone ring to produce the cis-3a-aryl-hydroindole skeleton. A related [4 + 2]-cycloaddition/rearrangement sequence was also used for a formal synthesis of the Chinese ornamental orchid (+/-)-dendrobine. The tricyclic alkaloid core was formed stereoselectivity from the thermolysis of N-[(2-methyl-2-cyclopentenyl)methyl]-N-(4-isopropyl-furan-2-yl)carbamic acid tert-butyl ester. Kende's advanced intermediate 33 was prepared in seven additional steps by standard transformations, thereby completing a formal synthesis of (+/-)-dendrobine.
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Affiliation(s)
- A Padwa
- Department of Chemistry, Emory University, Atlanta, Georgia 30322, USA.
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19
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Cassayre J, Zard SZ. A short synthesis of (−)-dendrobine. Some observations on the nickel mediated radical cyclisation and on the Pauson–Khand reaction. J Organomet Chem 2001. [DOI: 10.1016/s0022-328x(01)00662-3] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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20
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Padwa A, Dimitroff M, Liu B. Formal synthesis of (+/-)-dendrobine: use of the amidofuran cycloaddition/rearrangement sequence. Org Lett 2000; 2:3233-5. [PMID: 11009389 DOI: 10.1021/ol006444h] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The formal synthesis of the alkaloid (+/-)-dendrobine (4) was accomplished using the IMDAF cycloaddition/rearrangement sequence of a furanyl carbamate. Conversion of the rearranged cycloadduct to Kende's advanced intermediate in eight steps completed the formal synthesis of (+/-)-dendrobine.
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Affiliation(s)
- A Padwa
- Department of Chemistry, Emory University, Atlanta, Georgia 30322,
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21
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22
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23
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Sha CK, Chiu RT, Yang CF, Yao NT, Tseng WH, Liao FL, Wang SL. Total Synthesis of (−)-Dendrobine via α-Carbonyl Radical Cyclization. J Am Chem Soc 1997. [DOI: 10.1021/ja9643432] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Chin-Kang Sha
- Contribution from the Department of Chemistry, National Tsing Hua University, Hsinchu 300, Taiwan, R.O.C
| | - Rei-Torng Chiu
- Contribution from the Department of Chemistry, National Tsing Hua University, Hsinchu 300, Taiwan, R.O.C
| | - Cheng-Fen Yang
- Contribution from the Department of Chemistry, National Tsing Hua University, Hsinchu 300, Taiwan, R.O.C
| | - Nai-Tung Yao
- Contribution from the Department of Chemistry, National Tsing Hua University, Hsinchu 300, Taiwan, R.O.C
| | - Wei-Hong Tseng
- Contribution from the Department of Chemistry, National Tsing Hua University, Hsinchu 300, Taiwan, R.O.C
| | - Fen-Ling Liao
- Contribution from the Department of Chemistry, National Tsing Hua University, Hsinchu 300, Taiwan, R.O.C
| | - Sue-Lein Wang
- Contribution from the Department of Chemistry, National Tsing Hua University, Hsinchu 300, Taiwan, R.O.C
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24
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Schlecker W, Huth A, Ottow E, Mulzer J. Regioselective monometalation of 2,5-pyridinedicarboxamides with (2,2,6,6-tetramethylpiperidino)magnesium chloride (TMPMgCI). ACTA ACUST UNITED AC 1995. [DOI: 10.1002/jlac.1995199508195] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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25
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Synthesis of 4-arylpyridines and substituted β-carbolines via 1,4-Grignard-addition to pyridinecarboxamides. Tetrahedron 1995. [DOI: 10.1016/0040-4020(95)00596-z] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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26
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Takano S, Inomata K, Ogasawara K. A Facile Chiral Approach to the Dendrobine Skeleton by Intramolecular Pauson-Khand Reaction. CHEM LETT 1992. [DOI: 10.1246/cl.1992.443] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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27
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28
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Trost BM, Jebaratnam DJ. Syntheses of the picrotoxane skeleton via the palladium (II) - catalyzed carbacyclization reaction. Tetrahedron Lett 1987. [DOI: 10.1016/s0040-4039(00)95372-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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