1
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Design and synthesis of analogues of the sphingosine-1-phosphate receptor 1 agonist IMMH001 with improved phosphorylation rate in human blood. Bioorg Med Chem 2020; 28:115722. [PMID: 33065444 DOI: 10.1016/j.bmc.2020.115722] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Revised: 07/22/2020] [Accepted: 08/18/2020] [Indexed: 11/23/2022]
Abstract
IMMH001, which is a prodrug for sphingosine-1-phosphate receptor 1 (S1P1) agonist, is converted to the active form, its monophosphate ester (S)-IMMH001-P, by sphingosine kinase 1 (SphK1) and sphingosine kinase 2 (SphK2) in vivo. In this study, we designed head-piece-modified analogues of IMMH001 based on structural information and prepared them with an efficient modular synthetic strategy. The analogues showed higher phosphorylation rates in human blood than the parent compound. These results indicated that the pro-R hydroxymethyl in the head-piece-moiety of IMMH001 prevents the pro-S hydroxymethyl from being phosphorylated by the kinase and ATP. The analogues may have better therapeutic potential.
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2
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Cativiela C, Ordóñez M, Viveros-Ceballos JL. Stereoselective synthesis of acyclic α,α-disubstituted α-amino acids derivatives from amino acids templates. Tetrahedron 2020. [DOI: 10.1016/j.tet.2019.130875] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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3
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Serra M, Bernardi E, Lorenzi ED, Colombo L. Synthesis of Functionalized 6,5- and 7,5-Azabicycloalkane Amino Acids by Metathesis Reactions. J Org Chem 2019; 84:15726-15734. [PMID: 31693859 DOI: 10.1021/acs.joc.9b02268] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Azabicyclo[4.3.0]- and [5.3.0]alkanone amino acid derivatives were easily prepared by submitting the same starting dipeptide to a direct ring-closing enyne metathesis or an ethylene-mediated cross-enyne metathesis/ring-closing metathesis, respectively. The reactivity of the newly synthesized 6,5- and 7,5-fused bicyclic scaffolds was then investigated to obtain variously functionalized derivatives with potential applications in the field of peptides/peptidomimetics.
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Affiliation(s)
- Massimo Serra
- Department of Drug Sciences, Medicinal Chemistry and Pharmaceutical Technology Section , University of Pavia , Viale Taramelli 12 , 27100 Pavia , Italy
| | - Eric Bernardi
- Department of Drug Sciences, Medicinal Chemistry and Pharmaceutical Technology Section , University of Pavia , Viale Taramelli 12 , 27100 Pavia , Italy
| | - Ersilia De Lorenzi
- Department of Drug Sciences, Medicinal Chemistry and Pharmaceutical Technology Section , University of Pavia , Viale Taramelli 12 , 27100 Pavia , Italy
| | - Lino Colombo
- Department of Drug Sciences, Medicinal Chemistry and Pharmaceutical Technology Section , University of Pavia , Viale Taramelli 12 , 27100 Pavia , Italy
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4
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Abas H, Mas‐Roselló J, Amer MM, Durand DJ, Groleau RR, Fey N, Clayden J. Asymmetric and Geometry‐Selective α‐Alkenylation of α‐Amino Acids. Angew Chem Int Ed Engl 2019; 58:2418-2422. [DOI: 10.1002/anie.201813984] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2018] [Indexed: 11/11/2022]
Affiliation(s)
- Hossay Abas
- School of Chemistry Cantock's Close Bristol BS8 1TS UK
| | | | | | | | | | - Natalie Fey
- School of Chemistry Cantock's Close Bristol BS8 1TS UK
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5
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Abas H, Mas-Roselló J, Amer MM, Durand DJ, Groleau RR, Fey N, Clayden J. Asymmetric and Geometry-Selective α-Alkenylation of α-Amino Acids. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201813984] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Hossay Abas
- School of Chemistry; Cantock's Close Bristol BS8 1TS UK
| | | | | | | | | | - Natalie Fey
- School of Chemistry; Cantock's Close Bristol BS8 1TS UK
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6
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Serra M, Bernardi E, Marrubini G, De Lorenzi E, Colombo L. Palladium‐Catalyzed Asymmetric Decarboxylative Allylation of Azlactone Enol Carbonates: Fast Access to Enantioenriched α‐Allyl Quaternary Amino Acids. European J Org Chem 2019. [DOI: 10.1002/ejoc.201801363] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Massimo Serra
- Department of Drug Sciences Medicinal Chemistry and Pharmaceutical Technology Section University of Pavia Viale Taramelli 12 27100 Pavia Italy
| | - Eric Bernardi
- Department of Drug Sciences Medicinal Chemistry and Pharmaceutical Technology Section University of Pavia Viale Taramelli 12 27100 Pavia Italy
| | - Giorgio Marrubini
- Department of Drug Sciences Medicinal Chemistry and Pharmaceutical Technology Section University of Pavia Viale Taramelli 12 27100 Pavia Italy
| | - Ersilia De Lorenzi
- Department of Drug Sciences Medicinal Chemistry and Pharmaceutical Technology Section University of Pavia Viale Taramelli 12 27100 Pavia Italy
| | - Lino Colombo
- Department of Drug Sciences Medicinal Chemistry and Pharmaceutical Technology Section University of Pavia Viale Taramelli 12 27100 Pavia Italy
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7
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Xiao Q, Tang Y, Xie P, Yin D. Asymmetric amination of α,α-dialkyl substituted aldehydes catalyzed by a simple chiral primary amino acid and its application to the preparation of a S1P1 agonist. RSC Adv 2019; 9:33497-33505. [PMID: 35529148 PMCID: PMC9073532 DOI: 10.1039/c9ra06210f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Accepted: 09/24/2019] [Indexed: 11/21/2022] Open
Abstract
The chiral catalytic amination of an α,α-dialkyl substituted aldehyde usually proceeds with low enantioselectivity. We selected naphthyl-l-alanine as the catalyst and observed improved enantioselectivity for the amination. Using this method, racemic α-methyl-α-benzyloxypropanal was aminated to give chiral serine derivatives in 74% ee, which was further increased to >99% ee after recrystallization. Moreover, we also successfully synthesized a chiral phosphonium salt 9 for the preparation of one α-substituted alaninol compound 14 as an S1P1 agonist in high overall yield. The chiral catalytic amination of an α,α-dialkyl substituted aldehyde usually proceeds with low enantioselectivity.![]()
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Affiliation(s)
- Qiong Xiao
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines
- Beijing Key Laboratory of Active Substance Discovery and Druggability Evaluation
- Department of Medicinal Chemistry
- Institute of Materia Medica
- Peking Union Medical College
| | - Yifan Tang
- Beijing Union Pharmaceutical Factory
- PR China
| | - Ping Xie
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines
- Beijing Key Laboratory of Active Substance Discovery and Druggability Evaluation
- Department of Medicinal Chemistry
- Institute of Materia Medica
- Peking Union Medical College
| | - Dali Yin
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines
- Beijing Key Laboratory of Active Substance Discovery and Druggability Evaluation
- Department of Medicinal Chemistry
- Institute of Materia Medica
- Peking Union Medical College
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8
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Serra M, Peviani EG, Bernardi E, Colombo L. Synthesis of Variously Functionalized Azabicycloalkane Scaffolds by Domino Metathesis Reactions. J Org Chem 2017; 82:11091-11101. [PMID: 28953382 DOI: 10.1021/acs.joc.7b02047] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
7,5-Fused azabicycloalkane scaffolds, carrying a quaternary stereocenter at C3 position of the lactam ring, can act as effective reverse-turn mimics and have proven to be useful intermediates for the preparation of Arg-Gly-Asp (RGD)-based cyclopentapeptides (cRGD) with nanomolar activity as αvβ3/αvβ5 integrin antagonists. Here, we report the synthesis of new azabicycloalkane scaffolds endowed at the C6 position with a para-substituted phenethyl side chain, which could be exploited to obtain cRGD-based bioconjugates that may find promising applications in anticancer therapy. By performing a domino cross enyne metathesis/ring-closing metathesis (CEYM/RCM) in the presence of styrene derivatives, followed by catalytic hydrogenation of the diene system, we easily converted a dipeptide precursor into the desired C6-functionalized azabicycloalkane scaffolds. The presence of a suitably protected p-amino group on the styrene moiety could be exploited, after deprotection, either to directly conjugate a bioactive compound or to introduce a suitable spacer between the cRGD unit and the bioactive compound.
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Affiliation(s)
- Massimo Serra
- Department of Drug Sciences, Medicinal Chemistry and Pharmaceutical Technology Section, University of Pavia , Viale Taramelli 12, 27100 Pavia, Italy
| | - Elena Giulia Peviani
- Department of Drug Sciences, Medicinal Chemistry and Pharmaceutical Technology Section, University of Pavia , Viale Taramelli 12, 27100 Pavia, Italy
| | - Eric Bernardi
- Department of Drug Sciences, Medicinal Chemistry and Pharmaceutical Technology Section, University of Pavia , Viale Taramelli 12, 27100 Pavia, Italy
| | - Lino Colombo
- Department of Drug Sciences, Medicinal Chemistry and Pharmaceutical Technology Section, University of Pavia , Viale Taramelli 12, 27100 Pavia, Italy
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9
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Mas-Roselló J, Hachisu S, Clayden J. Geometry-Retentive C-Alkenylation of Lithiated α-Aminonitriles: Quaternary α-Alkenyl Amino Acids and Hydantoins. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201704908] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Josep Mas-Roselló
- School of Chemistry; University of Bristol; Cantock's Close Bristol BS8 1TS UK
| | - Shuji Hachisu
- Syngenta Agrochemicals; Jealotts Hill Research Station Bracknell, Berks RG42 6EY UK
| | - Jonathan Clayden
- School of Chemistry; University of Bristol; Cantock's Close Bristol BS8 1TS UK
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10
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Mas-Roselló J, Hachisu S, Clayden J. Geometry-Retentive C-Alkenylation of Lithiated α-Aminonitriles: Quaternary α-Alkenyl Amino Acids and Hydantoins. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/anie.201704908] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Josep Mas-Roselló
- School of Chemistry; University of Bristol; Cantock's Close Bristol BS8 1TS UK
| | - Shuji Hachisu
- Syngenta Agrochemicals; Jealotts Hill Research Station Bracknell, Berks RG42 6EY UK
| | - Jonathan Clayden
- School of Chemistry; University of Bristol; Cantock's Close Bristol BS8 1TS UK
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11
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Serra M, Bernardi E, Marrubini G, Colombo L. One-Pot Vinylation of Azlactones: Fast Access to Enantioenriched α-Vinyl Quaternary Amino Acids. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700353] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Massimo Serra
- Department of Drug Sciences; Medicinal Chemistry and Pharmaceutical Technology Section; University of Pavia; Viale Taramelli 12 27100 Pavia Italy
| | - Eric Bernardi
- Department of Drug Sciences; Medicinal Chemistry and Pharmaceutical Technology Section; University of Pavia; Viale Taramelli 12 27100 Pavia Italy
| | - Giorgio Marrubini
- Department of Drug Sciences; Medicinal Chemistry and Pharmaceutical Technology Section; University of Pavia; Viale Taramelli 12 27100 Pavia Italy
| | - Lino Colombo
- Department of Drug Sciences; Medicinal Chemistry and Pharmaceutical Technology Section; University of Pavia; Viale Taramelli 12 27100 Pavia Italy
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12
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James E, Pertusati F, Brancale A, McGuigan C. Kinase-independent phosphoramidate S1P 1 receptor agonist benzyl ether derivatives. Bioorg Med Chem Lett 2017; 27:1371-1378. [PMID: 28236593 DOI: 10.1016/j.bmcl.2017.02.011] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Revised: 02/03/2017] [Accepted: 02/05/2017] [Indexed: 02/01/2023]
Abstract
Previously published S1P receptor modulator benzyl ether derivatives have shown potential as being viable therapeutics for the treatment of neurodegenerative diseases, however, two of the most S1P1-selective compounds are reported as being poorly phosphorylated by kinases in vivo. Phosphoramidates of BED compounds (2a, 2b) were synthesised with the aim of producing kinase-independent S1P receptor modulators. Carboxypeptidase, human serum and cell lysate processing experiments were conducted. ProTide BED analogues were found to have an acceptable level of stability in acidic and basic conditions and in vitro metabolic processing experiments showed that they are processed to the desired pharmacologically active monophosphate. The research describes the development of an entirely novel family of therapeutic agents.
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Affiliation(s)
- Edward James
- School of Pharmacy and Pharmaceutical Sciences, Cardiff University, King Edward VII Avenue, Cardiff CF10 3NB, UK.
| | - Fabrizio Pertusati
- School of Pharmacy and Pharmaceutical Sciences, Cardiff University, King Edward VII Avenue, Cardiff CF10 3NB, UK
| | - Andrea Brancale
- School of Pharmacy and Pharmaceutical Sciences, Cardiff University, King Edward VII Avenue, Cardiff CF10 3NB, UK
| | - Chris McGuigan
- School of Pharmacy and Pharmaceutical Sciences, Cardiff University, King Edward VII Avenue, Cardiff CF10 3NB, UK
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13
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Granger BA, Brown DG. Design and synthesis of peptide-based macrocyclic cyclophilin inhibitors. Bioorg Med Chem Lett 2016; 26:5304-5307. [DOI: 10.1016/j.bmcl.2016.09.039] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2016] [Revised: 09/12/2016] [Accepted: 09/14/2016] [Indexed: 11/28/2022]
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14
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Serra M, Tambini SM, Di Giacomo M, Peviani EG, Belvisi L, Colombo L. Synthesis of Easy-to-Functionalize Azabicycloalkane Scaffolds as Dipeptide Turn Mimics en Route to cRGD-Based Bioconjugates. European J Org Chem 2015. [DOI: 10.1002/ejoc.201501003] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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15
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Kumar V, Klimovica K, Rasina D, Jirgensons A. 2-Vinyl Threoninol Derivatives via Acid-Catalyzed Allylic Substitution of Bisimidates. J Org Chem 2015; 80:5934-43. [PMID: 25941908 DOI: 10.1021/acs.joc.5b00529] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A diastereoselective synthesis of 4-vinyl oxazolines syn-2 was developed based on an acid-catalyzed cyclization of bistrichloroacetimidates (E)-1. The reaction likely involves an allyl carbenium ion intermediate in which the adjacent stereocenter directs the stereoselectivity for C-N bond formation. Oxazolines syn-2 were transformed to C-quaternary threoninol, threoninal, and threonine derivatives which can be further incorporated into complex natural compounds.
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Affiliation(s)
- Varun Kumar
- Latvian Institute of Organic Synthesis, Aizkraukles 21, Riga, Latvia LV 1006
| | - Kristine Klimovica
- Latvian Institute of Organic Synthesis, Aizkraukles 21, Riga, Latvia LV 1006
| | - Dace Rasina
- Latvian Institute of Organic Synthesis, Aizkraukles 21, Riga, Latvia LV 1006
| | - Aigars Jirgensons
- Latvian Institute of Organic Synthesis, Aizkraukles 21, Riga, Latvia LV 1006
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16
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Synthesis, resolution, and determination of absolute configuration of protected α-ethynylphenylalanine enantiomers. Amino Acids 2015; 47:899-907. [DOI: 10.1007/s00726-015-1917-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2014] [Accepted: 01/07/2015] [Indexed: 10/24/2022]
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17
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Nishi T, Nakamura T, Nakamura Y. Exploratory and Process Research on S1P1 Receptor Agonist CS-0777. J SYN ORG CHEM JPN 2014. [DOI: 10.5059/yukigoseikyokaishi.72.808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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18
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Aizpurua JM, Palomo C, Balentová E, Jimenez A, Andreieff E, Sagartzazu-Aizpurua M, Miranda JI, Linden A. Chirality-Driven Folding of Short β-Lactam Pseudopeptides. J Org Chem 2012; 78:224-37. [DOI: 10.1021/jo302368y] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Jesus M. Aizpurua
- Departamento
de Química
Orgánica-I, Facultad de Química, Universidad del País Vasco UPV/EHU, Paseo Manuel Lardizabal-3,
20018 San Sebastian, Spain
| | - Claudio Palomo
- Departamento de Química Orgánica-I, Joxe Mari Korta R&D Center, Universidad del País Vasco UPV/EHU, Avda Tolosa-72, 20018 San Sebastian, Spain
| | - Eva Balentová
- Departamento
de Química
Orgánica-I, Facultad de Química, Universidad del País Vasco UPV/EHU, Paseo Manuel Lardizabal-3,
20018 San Sebastian, Spain
| | - Azucena Jimenez
- Departamento
de Química
Orgánica-I, Facultad de Química, Universidad del País Vasco UPV/EHU, Paseo Manuel Lardizabal-3,
20018 San Sebastian, Spain
| | - Elena Andreieff
- Departamento
de Química
Orgánica-I, Facultad de Química, Universidad del País Vasco UPV/EHU, Paseo Manuel Lardizabal-3,
20018 San Sebastian, Spain
| | - Maialen Sagartzazu-Aizpurua
- Departamento
de Química
Orgánica-I, Facultad de Química, Universidad del País Vasco UPV/EHU, Paseo Manuel Lardizabal-3,
20018 San Sebastian, Spain
| | - José Ignacio Miranda
- Departamento
de Química
Orgánica-I, Facultad de Química, Universidad del País Vasco UPV/EHU, Paseo Manuel Lardizabal-3,
20018 San Sebastian, Spain
| | - Anthony Linden
- Institute of Organic Chemistry, University of Zürich, Winterthurerstrasse 190,
CH-8057 Zürich, Switzerland
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19
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Lu TJ, Lin CK. Asymmetric Synthesis of α-Methyl-α-Amino Acids via Diastereoselective Alkylation of (1S)-(+)-3-Carene Derived Tricyclic Iminolactone. J Org Chem 2011; 76:1621-33. [PMID: 21306163 DOI: 10.1021/jo1022537] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ta-Jung Lu
- Department of Chemistry, National Chung-Hsing University, Taichung, Taiwan 40227, Republic of China
| | - Cheng-Kun Lin
- Department of Chemistry, National Chung-Hsing University, Taichung, Taiwan 40227, Republic of China
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20
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Iio Y, Yamaoka M, Jin M, Nakamura Y, Nishi T. Asymmetric synthesis of α,α-disubstituted α-amino alcohol derivatives. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.tetasy.2011.02.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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21
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Armstrong A, Emmerson DPG. Enantioselective Synthesis of α-Alkyl,α-Vinyl Amino Acids via [2,3]-Sigmatropic Rearrangement of Selenimides. Org Lett 2011; 13:1040-3. [DOI: 10.1021/ol1030926] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Alan Armstrong
- Department of Chemistry, Imperial College London, South Kensington, London, SW7 2AZ, U.K
| | - Daniel P. G. Emmerson
- Department of Chemistry, Imperial College London, South Kensington, London, SW7 2AZ, U.K
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22
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Xiao Q, Wang LP, Jiao XZ, Liu XY, Wu Q, Xie P. Concise total synthesis of largazole. JOURNAL OF ASIAN NATURAL PRODUCTS RESEARCH 2010; 12:940-949. [PMID: 21061215 DOI: 10.1080/10286020.2010.510114] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The concise total synthesis of largazole was accomplished. The key step included the use of the Nagao thiazolidinethione auxiliary for the diastereoselective acetate aldol reaction and it acts as an acylating agent for the peptide formation.
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Affiliation(s)
- Qiong Xiao
- Peking Union Medical College & Chinese Academy of Medical Sciences, Institute of Materia Medica, Beijing, China
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23
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Jiao XZ, Wang LP, Xiao Q, Xie P, Liang XT. Total synthesis of (+)-conagenin. JOURNAL OF ASIAN NATURAL PRODUCTS RESEARCH 2009; 11:274-280. [PMID: 19408153 DOI: 10.1080/10286020902828369] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
A new approach for the synthesis of the (+)-conagenin has been achieved based on Evans asymmetry syn-aldol reaction and the self-regeneration of stereocenters strategy.
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Affiliation(s)
- Xiao-Zhen Jiao
- Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
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24
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Seebach D, Grošelj U, Badine D, Schweizer W, Beck A. Isolation and X-Ray Structures of Reactive Intermediates of Organocatalysis with Diphenylprolinol Ethers and with Imidazolidinones. Helv Chim Acta 2008. [DOI: 10.1002/hlca.200890216] [Citation(s) in RCA: 155] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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25
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Nakayama K, Maruoka K. Practical asymmetric synthesis of α-methylserine derivatives under mild phase-transfer conditions. Tetrahedron Lett 2008. [DOI: 10.1016/j.tetlet.2008.07.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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