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Matsunaga K, Saito N, Kogen H, Takatori K. Total Synthesis of (±)-Marsupellins A and B via Acetoxymarsupellone Using an Intramolecular Reductive Cyclization of Epoxycyanohydrin Derivative with Cp 2TiI. Org Lett 2019; 21:6054-6057. [PMID: 31310558 DOI: 10.1021/acs.orglett.9b02207] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The first total synthesis of C3- and C9-oxidized ent-longipinane-type sesquiterpenoids containing acetoxymarsupellone, marsupellins A and B, has been accomplished. This unique core common to C3- and C9-oxidized ent-longipinane-type sesquiterpenoids was constructed via a new intramolecular reductive cyclization reaction of an epoxycyanohydrin derivative using Cp2TiI.
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Affiliation(s)
- Kazuma Matsunaga
- Graduate School of Pharmaceutical Sciences , Meiji Pharmaceutical University , 2-522-1 Noshio , Kiyose , Tokyo 204-8588 , Japan
| | - Naoki Saito
- Graduate School of Pharmaceutical Sciences , Meiji Pharmaceutical University , 2-522-1 Noshio , Kiyose , Tokyo 204-8588 , Japan
| | - Hiroshi Kogen
- Graduate School of Pharmaceutical Sciences , Meiji Pharmaceutical University , 2-522-1 Noshio , Kiyose , Tokyo 204-8588 , Japan
| | - Kazuhiko Takatori
- Graduate School of Pharmaceutical Sciences , Meiji Pharmaceutical University , 2-522-1 Noshio , Kiyose , Tokyo 204-8588 , Japan
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2
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Nájera C, Sansano JM. Synthesis of pyrrolizidines and indolizidines by multicomponent 1,3-dipolar cycloaddition of azomethine ylides. PURE APPL CHEM 2018. [DOI: 10.1515/pac-2018-0710] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Abstract
Different multicomponent 1,3-dipolar cycloadditions (1,3-DC) of cyclic α-amino acid derivatives with aldehydes and dipolarophiles have been described as efficient and simple methodologies for the synthesis of the pyrrolidine unit of pyrrolizidines and indolizidines. When free cyclic α-amino acids are used, a thermal promoted decarboxylative process generates in situ the corresponding non-stabilized azomethine ylides, which afforded the corresponding pyrrolizidines and indolizidines with a hydrogen in the bicyclic units. This methodology has been employed to the synthesis of complex systems including spiro derivatives when ketones are used as carbonyl component. In addition, working with cyclic α-amino acid derived esters, the three-component 1,3-DC takes place under milder reaction conditions giving the corresponding pyrrolizidines and indolizidines with an alkoxycarbonyl group in the bridge adjacent carbon to the nitrogen. This methodology can be carried out by a double consecutive or stepwise 1,3-DC to provide pyrrolizidines via the precursor prolinates. The conformation of the azomethine ylide controls the endo/exo diastereoselectivity of the 1,3-DC.
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Affiliation(s)
- Carmen Nájera
- Departamento de Química Orgánica and Centro de Innovación en Química Avanzada (ORFEO-CINQA) , Universidad de Alicante , Apdo. 99 , Alicante 03080 , Spain
| | - José Miguel Sansano
- Departamento de Química Orgánica and Centro de Innovación en Química Avanzada (ORFEO-CINQA) , Universidad de Alicante , Apdo. 99 , Alicante 03080 , Spain
- Instituto de Síntesis Orgánica, Universidad de Alicante , Apdo. 99 , Alicante 03080 , Spain
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3
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Synthesis of 6,6-dimethyltricyclo[5.4.0.02,8]undecane-2,9-diol for (ent-)longipinane-type sesquiterpenoids using two types of radical cyclization reactions. Tetrahedron Lett 2018. [DOI: 10.1016/j.tetlet.2018.09.030] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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4
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Li J, Ye Y, Zhang Y. Cycloaddition/annulation strategies for the construction of multisubstituted pyrrolidines and their applications in natural product synthesis. Org Chem Front 2018. [DOI: 10.1039/c7qo01077j] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Pyrrolidines are privileged substructures of numerous bioactive natural products and drugs.
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Affiliation(s)
- Jundong Li
- Department of Chemistry and Key Laboratory of Chemical Biology of Fujian Province
- iChEM
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xiamen
| | - Yilin Ye
- Department of Chemistry and Key Laboratory of Chemical Biology of Fujian Province
- iChEM
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xiamen
| | - Yandong Zhang
- Department of Chemistry and Key Laboratory of Chemical Biology of Fujian Province
- iChEM
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xiamen
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5
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Subasi NT, Yalcinkaya H, Demir AS. Highly selective intermolecular one-pot three component 1,3-dipolar cycloaddition reaction of aldehydes, with phosphonates and proline. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.05.091] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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6
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Medvedeva SM, Shikhaliev KS. (3+2) Cycloaddition reactions in the synthesis of C(4)–N(5)-condensed tetrahydropyrrolo[3,4-c]pyrrole-1,3-diones (microreview). Chem Heterocycl Compd (N Y) 2016. [DOI: 10.1007/s10593-016-1949-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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7
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Chen S, Bacauanu V, Knecht T, Mercado BQ, Bergman RG, Ellman JA. New Regio- and Stereoselective Cascades via Unstabilized Azomethine Ylide Cycloadditions for the Synthesis of Highly Substituted Tropane and Indolizidine Frameworks. J Am Chem Soc 2016; 138:12664-70. [PMID: 27642766 DOI: 10.1021/jacs.6b08355] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Multisubstituted tropanes and indolizidines have been prepared with high regio- and stereoselectivity by the [3+2] cycloaddition of unstabilized azomethine ylides generated from readily prepared trimethylsilyl-substituted 1,2-dihydropyridines via protonation or alkylation followed by desilylation. Starting from 1,2-dihydropyridines bearing a ring trimethylsilyl substituent at the 6-position, an intermolecular alkylation/desilylation provides endocyclic unstabilized ylides that successfully undergo cycloaddition with a range of symmetrical and unsymmetrical alkyne and alkene dipolarophiles to afford densely substituted tropanes incorporating quaternary carbons in good yields and with high regio- and stereoselectivity. Additionally, an intramolecular alkylation/desilylation/cycloaddition sequence provides convenient and rapid entry to bridged tricyclic tropane skeletons, allowing for five contiguous carbon stereocenters to be set in a single experimental operation and under mild conditions. Starting from 1,2-dihydropyridines with trimethylsilylmethyl groups on nitrogen, protonation followed by desilylation generates exocyclic unstabilized ylides that undergo cycloaddition with unsymmetrical alkynes to give indolizidines with good regio- and stereoselectivity. N-Trimethylsilylmethyl-1,2-dihydropyridines can also be alkylated and subsequently desilylated to give endocyclic unstabilized ylides that undergo intermolecular cycloadditions with carbonyl compounds to give bicyclic oxazolidine products in good overall yields. Moreover, an intramolecular alkylation/desilylation/cycloaddition sequence with the N-trimethylsilylmethyl-1,2-dihydropyridines affords tricyclic indolizidines that incorporate quaternary carbons and up to five stereocenters with good to excellent regio- and diastereoselectivity.
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Affiliation(s)
- Shuming Chen
- Department of Chemistry, Yale University , New Haven, Connecticut 06520, United States
| | - Vlad Bacauanu
- Department of Chemistry, Yale University , New Haven, Connecticut 06520, United States
| | - Tobias Knecht
- Department of Chemistry, Yale University , New Haven, Connecticut 06520, United States
| | - Brandon Q Mercado
- Department of Chemistry, Yale University , New Haven, Connecticut 06520, United States
| | - Robert G Bergman
- Division of Chemical Sciences, Lawrence Berkeley National Laboratory, and Department of Chemistry, University of California , Berkeley, California 94720, United States
| | - Jonathan A Ellman
- Department of Chemistry, Yale University , New Haven, Connecticut 06520, United States
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8
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Singh MS, Chowdhury S, Koley S. Progress in 1,3-dipolar cycloadditions in the recent decade: an update to strategic development towards the arsenal of organic synthesis. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.02.031] [Citation(s) in RCA: 142] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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9
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Furnival RC, Saruengkhanphasit R, Holberry HE, Shewring JR, Guerrand HDS, Adams H, Coldham I. Cascade oxime formation, cyclization to a nitrone, and intermolecular dipolar cycloaddition. Org Biomol Chem 2016; 14:10953-10962. [DOI: 10.1039/c6ob01871h] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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10
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Belskaya NP, Lesogorova SG, Subbotina JO, Koksharov AV, Slepukhin PA, Dehaen W, Bakulev VA. 1,3-Dipolar cycloaddition of 3-alkylsulfanyl-2-arylazo-3-(tert-cycloalkylamino)acrylonitriles with N-methyl- and N-phenylmaleimides. Tetrahedron 2015. [DOI: 10.1016/j.tet.2014.12.087] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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11
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Elamparuthi E, Sarathkumar S, Girija S, Anbazhagan V. A facile synthesis of isoindoline and Δ1-pyrrolines from chalcone and glycine by a cascade of process involving addition, in situ decarboxylation, and cyclization. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.05.119] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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12
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Siriwardena A, Sonawane DP, Bande OP, Markad PR, Yonekawa S, Tropak MB, Ghosh S, Chopade BA, Mahuran DJ, Dhavale DD. Synthesis of 1,5-Dideoxy-1,5-iminoribitol C-Glycosides through a Nitrone–Olefin Cycloaddition Domino Strategy: Identification of Pharmacological Chaperones of Mutant Human Lysosomal β-Galactosidase. J Org Chem 2014; 79:4398-404. [DOI: 10.1021/jo500328u] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Aloysius Siriwardena
- Laboratoire
de Glycochimie, des Antimicrobiens et des Agroressources, Université de Picardie Jules Verne, FRE 3517 CNRS, Amiens 80039, France
| | | | - Omprakash P. Bande
- Laboratoire
de Glycochimie, des Antimicrobiens et des Agroressources, Université de Picardie Jules Verne, FRE 3517 CNRS, Amiens 80039, France
| | | | - Sayuri Yonekawa
- Programme
in Genetics and Genome Biology, Sickkids, Toronto, Ontario M5G 1X8, Canada
| | - Michael B. Tropak
- Programme
in Genetics and Genome Biology, Sickkids, Toronto, Ontario M5G 1X8, Canada
| | | | | | - Don J. Mahuran
- Programme
in Genetics and Genome Biology, Sickkids, Toronto, Ontario M5G 1X8, Canada
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13
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Chou SSP, Huang JL. Studies toward the first stereoselective total synthesis of (±)-quinolizidine 195C and other transformations. Molecules 2013; 18:8243-56. [PMID: 23857127 PMCID: PMC6269906 DOI: 10.3390/molecules18078243] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2013] [Revised: 07/02/2013] [Accepted: 07/03/2013] [Indexed: 11/16/2022] Open
Abstract
Starting from a thio-substituted 4-quinolizidinone, a series of C-6 alkylated derivatives with a trans C-6, C-9a relationship was synthesized. Further transformations led to the first stereoselective total synthesis of the structure proposed for (±)-quinolizidine 195C, the major alkaloid isolated from the skin extracts of the Madagascan frog Mantella betsileo. Since the spectral data of the synthetic and natural products differed significantly, the true structure of (±)-quinolizidine 195C remains uncertain.
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Affiliation(s)
- Shang-Shing P Chou
- Department of Chemistry, Fu Jen Catholic University, New Taipei City 24205, Taiwan.
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14
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McCormack MP, Waters SP. Synthesis of functionalized indolizidines through Pauson-Khand cycloaddition of 2-allylpyrrolidines. J Org Chem 2013; 78:1176-83. [PMID: 23311620 DOI: 10.1021/jo302734w] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
A concise entry to functionalized indolizidine scaffolds through a domino 2-aza-Cope-[3 + 2] dipolar cycloaddition and Pauson-Khand [2 + 2 + 1] cyclization has been accomplished. The process was conducted under mild conditions to afford diverse indolizidine systems as single diastereomers in good overall yields.
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Affiliation(s)
- Michael P McCormack
- Department of Chemistry, The University of Vermont, 82 University Place, Burlington, Vermont 05405, USA
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15
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Sanaboina C, Jana S, Chidara S, Patro B, Raolji GB, Eppakayala L. Synthesis of indolo[2,3-a]quinolizine and hexahydro-1H-indolizino[8,7-b]indole derivatives by cascade condensation, cyclization, and Pictet–Spengler reaction: an application to the synthesis of (±)-harmicine. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.07.044] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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16
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Coldham I, Watson L, Adams H, Martin NG. Synthesis of the Core Ring System of the Yuzurimine-Type Daphniphyllum Alkaloids by Cascade Condensation, Cyclization, Cycloaddition Chemistry. J Org Chem 2011; 76:2360-6. [DOI: 10.1021/jo2000868] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Iain Coldham
- Department of Chemistry, University of Sheffield, Brook Hill, Sheffield S3 7HF, U.K
| | - Luke Watson
- Department of Chemistry, University of Sheffield, Brook Hill, Sheffield S3 7HF, U.K
| | - Harry Adams
- Department of Chemistry, University of Sheffield, Brook Hill, Sheffield S3 7HF, U.K
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17
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Yu Z, Lim RKV, Lin Q. Synthesis of macrocyclic tetrazoles for rapid photoinduced bioorthogonal 1,3-dipolar cycloaddition reactions. Chemistry 2011; 16:13325-9. [PMID: 21031376 DOI: 10.1002/chem.201002360] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Zhipeng Yu
- Department of Chemistry, State University of New York at Buffalo, Buffalo, NY 14260, USA
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18
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Coldham I, Burrell AJM, Guerrand HDS, Oram N. Cascade cyclization, dipolar cycloaddition to bridged tricyclic amines related to the Daphniphyllum alkaloids. Org Lett 2011; 13:1267-9. [PMID: 21314102 DOI: 10.1021/ol102961x] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A tandem one-pot reaction of an aldehyde with a primary amine involving condensation and then cyclization (N-alkylation), followed by intramolecular dipolar cycloaddition of the resulting nitrone or azomethine ylide, provides a synthesis of bridged tricyclic amines. The reaction was most successful using hydroxylamine, and when the dipolarophile was an unsaturated ester, subsequent reduction of the N-O bond and cyclization to the lactam provided the core ring system of the yuzurimine, daphnilactone B, and bukittinggine type Daphniphyllum alkaloids.
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Affiliation(s)
- Iain Coldham
- Department of Chemistry, University of Sheffield, Brook Hill, Sheffield, S3 7HF, UK.
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19
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Guerrand HDS, Adams H, Coldham I. Cascade cyclization, dipolar cycloaddition of azomethine imines for the synthesis of pyrazolidines. Org Biomol Chem 2011; 9:7921-8. [DOI: 10.1039/c1ob06122d] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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20
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Kielland N, Catti F, Bello D, Isambert N, Soteras I, Luque F, Lavilla R. Boron-Based Dipolar Multicomponent Reactions: Simple Generation of Substituted Aziridines, Oxazolidines and Pyrrolidines. Chemistry 2010; 16:7904-15. [DOI: 10.1002/chem.201000349] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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21
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Davis MC, Baldwin LC. Alternative Route to the Diisocyanate Building Block 1,4-Diisocyanato-4-methylpentane (DIMP). SYNTHETIC COMMUN 2010. [DOI: 10.1080/00397910903097278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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22
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Bélanger G, Darsigny V, Doré M, Lévesque F. Highly Diastereoselective Synthesis of Substituted Pyrrolidines Using a Sequence of Azomethine Ylide Cycloaddition and Nucleophilic Cyclization. Org Lett 2010; 12:1396-9. [DOI: 10.1021/ol902767b] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Guillaume Bélanger
- Département de Chimie, Université de Sherbrooke, 2500 Boulevard Université, Sherbrooke, Québec J1K 2R1, Canada
| | - Véronique Darsigny
- Département de Chimie, Université de Sherbrooke, 2500 Boulevard Université, Sherbrooke, Québec J1K 2R1, Canada
| | - Michaël Doré
- Département de Chimie, Université de Sherbrooke, 2500 Boulevard Université, Sherbrooke, Québec J1K 2R1, Canada
| | - François Lévesque
- Département de Chimie, Université de Sherbrooke, 2500 Boulevard Université, Sherbrooke, Québec J1K 2R1, Canada
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Burrell AJM, Watson L, Martin NG, Oram N, Coldham I. Synthesis of the core ring system of the stemona alkaloids by cascade condensation, cyclization, intramolecular cycloaddition. Org Biomol Chem 2010; 8:4530-2. [DOI: 10.1039/c0ob00408a] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Burrell AJM, Coldham I, Watson L, Oram N, Pilgram CD, Martin NG. Stereoselective formation of fused tricyclic amines from acyclic aldehydes by a cascade process involving condensation, cyclization, and dipolar cycloaddition. J Org Chem 2009; 74:2290-300. [PMID: 18998734 DOI: 10.1021/jo8019913] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The preparation of tricyclic amines from acyclic precursors is described using a cascade of tandem reactions involving condensation of an aldehyde with a primary amine, cyclization (with displacement of a halide), and then in situ deprotonation or decarboxylation to give an azomethine ylide or nitrone followed by intramolecular dipolar cycloaddition. The methodology is straightforward, and the aldehyde precursors are prepared easily and quickly in high yield using nitrile alkylations followed by DIBAL-H reduction. The relative ease of reaction of various substrates with different tether lengths between the aldehyde and the halide or dipolarophile has been studied. Several primary amines including simple amino acids such as glycine, alanine, and phenylalanine and derivatives such as glycine ethyl ester and also hydroxylamine have been investigated. High yields are obtained in the formation of different tricyclic ring sizes; the dipolar cycloaddition necessarily creates a five-membered ring, and we have investigated the formation of five- and six-membered rings for the other two new ring sizes. In all cases, yields are high (except when using glycine when the tether to the terminal alkene dipolarophile leads to a six-membered ring), and most efficient is the formation of the tricyclic product in which all five-membered rings are formed. Examples with an alkyne as the dipolarophile were also successful. In all the reactions studied, the products are formed with complete regioselectivity and remarkably with complete stereoselectivity. The key step involves the formation of three new rings and potentially up to four new stereocenters in a single transformation. The power of the chemistry was demonstrated by the synthesis of the core ring systems of the alkaloids (+/-)-scandine and (+/-)-myrioneurinol and the total syntheses of the alkaloids (+/-)-aspidospermine, (+/-)-quebrachamine, and (+/-)-aspidospermidine.
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Affiliation(s)
- Adam J M Burrell
- Department of Chemistry, University of Sheffield, Brook Hill, Sheffield S3 7HF, UK
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Burrell AJM, Coldham I, Oram N. Synthesis of Fused Tricyclic Amines from Enolizable Acyclic Aldehydes by Cyclization then Dipolar Cycloaddition Cascade: Synthesis of Myrioxazine A. Org Lett 2009; 11:1515-8. [DOI: 10.1021/ol9001653] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Adam J. M. Burrell
- Department of Chemistry, University of Sheffield, Brook Hill, Sheffield, S3 7HF, U.K., and Eli Lilly and Company, Erl Wood Manor, Windlesham, Surrey, GU20 6PH, U.K
| | - Iain Coldham
- Department of Chemistry, University of Sheffield, Brook Hill, Sheffield, S3 7HF, U.K., and Eli Lilly and Company, Erl Wood Manor, Windlesham, Surrey, GU20 6PH, U.K
| | - Niall Oram
- Department of Chemistry, University of Sheffield, Brook Hill, Sheffield, S3 7HF, U.K., and Eli Lilly and Company, Erl Wood Manor, Windlesham, Surrey, GU20 6PH, U.K
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26
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Coldham I, Jana S, Watson L, Martin NG. Cascade condensation, cyclization, intermolecular dipolar cycloaddition by multi-component coupling and application to a synthesis of (±)-crispine A. Org Biomol Chem 2009; 7:1674-9. [DOI: 10.1039/b822743h] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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