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Sintim HO, Al Mamari HH, Almohseni HAA, Fegheh-Hassanpour Y, Hodgson DM. Alkylation of lithiated dimethyl tartrate acetonide with unactivated alkyl halides and application to an asymmetric synthesis of the 2,8-dioxabicyclo[3.2.1]octane core of squalestatins/zaragozic acids. Beilstein J Org Chem 2019; 15:1194-1202. [PMID: 31293666 PMCID: PMC6604716 DOI: 10.3762/bjoc.15.116] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Accepted: 05/14/2019] [Indexed: 12/03/2022] Open
Abstract
(R,R)-Dimethyl tartrate acetonide 7 in THF/HMPA undergoes deprotonation with LDA and reaction at −78 °C during 12–72 h with a range of alkyl halides, including non-activated substrates, to give single diastereomers (at the acetonide) of monoalkylated tartrates 17, 24, 33a–f, 38a,b, 41 of R,R-configuration, i.e., a stereoretentive process (13–78% yields). Separable trans-dialkylated tartrates 34a–f can be co-produced in small amounts (9–14%) under these conditions, and likely arise from the achiral dienolate 36 of tartrate 7. Enolate oxidation and acetonide removal from γ-silyloxyalkyl iodide-derived alkylated tartrates 17 and 24 give ketones 21 and 26 and then Bamford–Stevens-derived diazoesters 23 and 27, respectively. Only triethylsilyl-protected diazoester 27 proved viable to deliver a diazoketone 28. The latter underwent stereoselective carbonyl ylide formation–cycloaddition with methyl glyoxylate and acid-catalysed rearrangement of the resulting cycloadduct 29, to give the 3,4,5-tricarboxylate-2,8-dioxabicyclo[3.2.1]octane core 31 of squalestatins/zaragozic acids. Furthermore, monoalkylated tartrates 33a,d,f, and 38a on reaction with NaOMe in MeOH at reflux favour (≈75:25) the cis-diester epimers epi-33a,d,f and epi-38a (54–67% isolated yields), possessing the R,S-configuration found in several monoalkylated tartaric acid motif-containing natural products.
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Affiliation(s)
- Herman O Sintim
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, United Kingdom.,Department of Chemistry, Purdue University, West Lafayette, IN 47907- 2112, USA
| | - Hamad H Al Mamari
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, United Kingdom.,Department of Chemistry, College of Science, Sultan Qaboos University, PO Box 36, Al Khoud 123, Muscat, Sultanate of Oman
| | - Hasanain A A Almohseni
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, United Kingdom.,permanent address: University of Kufa, Najaf Governorate, Iraq
| | - Younes Fegheh-Hassanpour
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - David M Hodgson
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, United Kingdom
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Drop A, Wojtasek H, Frąckowiak-Wojtasek B. Selective isomerization of a trans -butanediacetal derivative of tartaric acid with differentiating substituents at C-2 and C-3. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.02.072] [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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Garner ME, Hohloch S, Maron L, Arnold J. A New Supporting Ligand in Actinide Chemistry Leads to Reactive Bis(NHC)borate-Supported Thorium Complexes. Organometallics 2016. [DOI: 10.1021/acs.organomet.6b00467] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Mary E. Garner
- Department
of Chemistry, University of California, Berkeley, California 94720, United States
| | - Stephan Hohloch
- Department
of Chemistry, University of California, Berkeley, California 94720, United States
| | - Laurent Maron
- LPCNO, Université de Toulouse, INSA Toulouse, 135 Avenue
de Rangueil, 31077 Toulouse, France
| | - John Arnold
- Department
of Chemistry, University of California, Berkeley, California 94720, United States
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Estipona BI, Pritchett BP, Craig RA, Stoltz BM. Catalytic enantioselective total synthesis of (+)-eucomic acid. Tetrahedron 2016; 72:3707-3712. [PMID: 27546916 DOI: 10.1016/j.tet.2016.02.059] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
A catalytic enantioselective synthesis of (+)-eucomic acid is reported. A palladium-catalyzed asymmetric allylic alkylation is employed to access the chiral tetrasubstituted α-hydroxyacid moiety found in the natural product. The protecting group strategy was investigated, and a protecting group manipulation was made without any appreciable deleterious effects in the allylic alkylation reaction. Non-natural (+)-eucomic acid is synthesized in a longest linear sequence of 13 steps.
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Affiliation(s)
- Benzi I Estipona
- Warren and Katharine Schlinger Laboratory of Chemistry and Chemical Engineering, California Institute of Technology, 1200 E California Blvd MC 101-20, Pasadena, CA 91125, United States of America
| | - Beau P Pritchett
- Warren and Katharine Schlinger Laboratory of Chemistry and Chemical Engineering, California Institute of Technology, 1200 E California Blvd MC 101-20, Pasadena, CA 91125, United States of America
| | - Robert A Craig
- Warren and Katharine Schlinger Laboratory of Chemistry and Chemical Engineering, California Institute of Technology, 1200 E California Blvd MC 101-20, Pasadena, CA 91125, United States of America
| | - Brian M Stoltz
- Warren and Katharine Schlinger Laboratory of Chemistry and Chemical Engineering, California Institute of Technology, 1200 E California Blvd MC 101-20, Pasadena, CA 91125, United States of America
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Miranda V, Maycock CD, Ventura MR. A Stereoselective Synthesis of (+)-Piscidic Acid and Cimicifugic Acid L. European J Org Chem 2015. [DOI: 10.1002/ejoc.201501002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Lourenço EC, Ventura MR. Synthesis of Potassium (2R)-2-O-α-D-Mannopyranosyl-(1→2)-α-D-glucopyranosyl-2,3-dihydroxypropanoate: A Naturally Compatible Solute. European J Org Chem 2011. [DOI: 10.1002/ejoc.201100934] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Okada M, Park S, Koshizawa T, Ueda M. (R)-Eucomic acid, a leaf-opening factor of the model organism, Lotus japonicus. Tetrahedron 2009. [DOI: 10.1016/j.tet.2008.11.097] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Carter CF, Baxendale IR, O'Brien M, Pavey JBJ, Ley SV. Synthesis of acetal protected building blocks using flow chemistry with flow I.R. analysis: preparation of butane-2,3-diacetal tartrates. Org Biomol Chem 2009; 7:4594-7. [DOI: 10.1039/b917289k] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Graça Martins J, Cambeiro Barrulas P, Marques CS, Burke AJ. New Route to N‐Alkylated trans‐Pyrrolidine Diols from 2,2,3,3‐Tetramethoxybutane‐Protected Dimethyl Tartrate. SYNTHETIC COMMUN 2008. [DOI: 10.1080/00397910801916520] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- J. Graça Martins
- a Chemistry Department and Évora Chemistry Centre , University of Évora , Évora , Portugal
| | - P. Cambeiro Barrulas
- a Chemistry Department and Évora Chemistry Centre , University of Évora , Évora , Portugal
| | - Carolina S. Marques
- a Chemistry Department and Évora Chemistry Centre , University of Évora , Évora , Portugal
| | - Anthony J. Burke
- a Chemistry Department and Évora Chemistry Centre , University of Évora , Évora , Portugal
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Lence E, Castedo L, González-Bello C. The conformational rigidity of butane-1,2-diacetals as a powerful synthetic tool. Chem Soc Rev 2008; 37:1689-708. [DOI: 10.1039/b717902b] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Ley SV, Sheppard TD, Myers RM, Chorghade MS. Chiral Glycolate Equivalents for the Asymmetric Synthesis of α-Hydroxycarbonyl Compounds. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2007. [DOI: 10.1246/bcsj.80.1451] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Abstract
1,2-Diacetals are readily prepared, rigid structural motifs that provide a wide range of opportunities for applications in natural product assembly. These uses encompass selective 1,2-diol or alpha-hydroxy acid protection, enantiotopic recognition and desymmetrization methods, chiral memory applications, and reactivity control in oligosaccharide synthesis, as well as functioning as templating components, chiral auxiliaries, and building blocks. 1,2-Diacetals are often more stable and lead to products with enhanced crystallinity compared to their five-ring acetonide counterparts. Many 1,2-diacetals have favorable NMR parameters, which facilitate structural assignment, particularly during asymmetric reaction processes.
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Affiliation(s)
- Steven V Ley
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, U.K.
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