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Gao Y, Peng SQ, Liu DY, Rui PX, Hu XG. Copper-Catalyzed Four-Component Reaction for the Synthesis ofN-Difluoroethyl Imides. European J Org Chem 2018. [DOI: 10.1002/ejoc.201801334] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Yu Gao
- National Engineering Research Center for Carbohydrate Synthesis; Jiangxi Normal University; 330022 Nanchang P.R. China
- Key Laboratory of Small Functional Organic Molecule, Ministry of Education; Jiangxi Normal University; 330022 Nanchang, Jiangxi P.R. China
| | - Shan-Qing Peng
- National Engineering Research Center for Carbohydrate Synthesis; Jiangxi Normal University; 330022 Nanchang P.R. China
- Key Laboratory of Small Functional Organic Molecule, Ministry of Education; Jiangxi Normal University; 330022 Nanchang, Jiangxi P.R. China
| | - De-Yong Liu
- National Engineering Research Center for Carbohydrate Synthesis; Jiangxi Normal University; 330022 Nanchang P.R. China
- Key Laboratory of Small Functional Organic Molecule, Ministry of Education; Jiangxi Normal University; 330022 Nanchang, Jiangxi P.R. China
| | - Pei-Xin Rui
- National Engineering Research Center for Carbohydrate Synthesis; Jiangxi Normal University; 330022 Nanchang P.R. China
- Key Laboratory of Small Functional Organic Molecule, Ministry of Education; Jiangxi Normal University; 330022 Nanchang, Jiangxi P.R. China
| | - Xiang-Guo Hu
- National Engineering Research Center for Carbohydrate Synthesis; Jiangxi Normal University; 330022 Nanchang P.R. China
- Key Laboratory of Small Functional Organic Molecule, Ministry of Education; Jiangxi Normal University; 330022 Nanchang, Jiangxi P.R. China
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2
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Han J, Kitagawa O, Wzorek A, Klika KD, Soloshonok VA. The self-disproportionation of enantiomers (SDE): a menace or an opportunity? Chem Sci 2018; 9:1718-1739. [PMID: 29675218 PMCID: PMC5892310 DOI: 10.1039/c7sc05138g] [Citation(s) in RCA: 80] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2017] [Accepted: 01/12/2018] [Indexed: 01/05/2023] Open
Abstract
Herein we report on the well-documented, yet not widely known, phenomenon of the self-disproportionation of enantiomers (SDE): the spontaneous fractionation of scalemic material into enantioenriched and -depleted fractions when any physicochemical process is applied.
Herein we report on the well-documented, yet not widely known, phenomenon of the self-disproportionation of enantiomers (SDE): the spontaneous fractionation of scalemic material into enantioenriched and -depleted fractions when any physicochemical process is applied. The SDE has implications ranging from the origins of prebiotic homochirality to unconventional enantiopurification methods, though the risks of altering the enantiomeric excess (ee) unintentionally, regrettably, remain greatly unappreciated. While recrystallization is well known as an SDE process, occurrences of the SDE in other processes are much less recognized, e.g. sublimation and even distillation. But the most common process that many workers seem to be completely ignorant of is SDE via chromatography and reports have included all manner of structures, all types of interactions, and all forms of chromatography, including GC. The SDE can be either a blessing – as a means to obtain enantiopure samples from scalemates – or a curse, as unwitting alteration of the ee leads to errors in the reporting of results and/or misinterpretation of the system under study. Thus the ramifications of the SDE are relevant to any area involving chirality – natural products, asymmetric synthesis, etc. Moreover, there is grave concern regarding errors in the literature, in addition to the possible occurrence of valid results which may have been overlooked and thus remain unreported, as well as the potential for the SDE to alter the ee, particularly via chromatography, and the following concepts will be conveyed: (1) the SDE occurs under totally achiral conditions of (a) precipitation, (b) centrifugation, (c) evaporation, (d) distillation, (e) crystallization, (f) sublimation, and (g) achiral chromatography (e.g. column, flash, MPLC, HPLC, SEC, GC, etc.). (2) The SDE cannot be controlled simply by experimental accuracy and ignorance of the SDE unavoidably leads to mistakes in the recorded and reported stereochemical outcome of enantioselective transformations. (3) The magnitude of the SDE (the difference between the extremes of enantioenrichment and -depletion) can be controlled and used to: (a) minimize mistakes in the recorded experimental values and (b) to develop unconventional and preparatively superior methods for enantiopurification. (4) The magnitude of the SDE cannot be predicted but can be expected for compounds possessing SDE-phoric groups or which have a general tendency for strong hydrogen or halogen bonds or dipole–dipole or aromatic π–π interactions. (5) An SDE test and the rigorous reporting and description of applied physicochemical processes should become part of standard experimental practice to prevent the erroneous reporting of the stereochemical outcome of enantioselective catalytic reactions and the chirooptical properties of scalemates. New directions in the study of the SDE, including halogen bonding-based interactions and novel, unconventional enantiopurification methods such as pseudo-SDE (chiral selector-assisted SDE resolution of racemates), are also reported.
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Affiliation(s)
- Jianlin Han
- School of Chemistry and Chemical Engineering , State Key Laboratory of Coordination Chemistry , Jiangsu Key Laboratory of Advanced Organic Materials , Nanjing University , 210093 Nanjing , China .
| | - Osamu Kitagawa
- Department of Applied Chemistry , Shibaura Institute of Technology , 3-7-5 Toyosu, Kohto-ku , Tokyo 135-8548 , Japan
| | - Alicja Wzorek
- Institute of Chemistry , Jan Kochanowski University in Kielce , Świętokrzyska 15G , 25-406 Kielce , Poland.,Department of Organic Chemistry I , Faculty of Chemistry , University of the Basque Country UPV/EHU , Paseo Manuel Lardizábal 3 , 20018 San Sebastián , Spain .
| | - Karel D Klika
- Molecular Structure Analysis , German Cancer Research Center (DKFZ) , Im Neuenheimer Feld 280 , D-69009 Heidelberg , Germany .
| | - Vadim A Soloshonok
- Department of Organic Chemistry I , Faculty of Chemistry , University of the Basque Country UPV/EHU , Paseo Manuel Lardizábal 3 , 20018 San Sebastián , Spain . .,IKERBASQUE, Basque Foundation for Science , Alameda Urquijo 36-5, Plaza, Bizkaia , 48011 Bilbao , Spain
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Morisaki K, Morimoto H, Mashima K, Ohshima T. Development of Direct Enantioselective Alkynylation of α-Ketoester and α-Ketiminoesters Catalyzed by Phenylbis(oxazoline)Rh(III) Complexes. J SYN ORG CHEM JPN 2018. [DOI: 10.5059/yukigoseikyokaishi.76.226] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
| | | | | | - Takashi Ohshima
- Graduate School of Pharmaceutical Sciences, Kyushu University
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Biological evaluation of both enantiomers of fluoro-thalidomide using human myeloma cell line H929 and others. PLoS One 2017; 12:e0182152. [PMID: 28763493 PMCID: PMC5538663 DOI: 10.1371/journal.pone.0182152] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Accepted: 07/13/2017] [Indexed: 11/19/2022] Open
Abstract
Over the last few years, thalidomide has become one of the most important anti-tumour drugs for the treatment of relapsed-refractory multiple myeloma. However, besides its undesirable teratogenic side effect, its configurational instability critically limits any further therapeutic improvements of this drug. In 1999, we developed fluoro-thalidomide which is a bioisostere of thalidomide, but, in sharp contrast to the latter, it is configurationally stable and readily available in both enantiomeric forms. The biological activity of fluoro-thalidomide however, still remains virtually unstudied, with the exception that fluoro-thalidomide is not teratogenic. Herein, we report the first biological evaluation of fluoro-thalidomide in racemic and in both (R)- and (S)-enantiomerically pure forms against (in vitro) H929 cells of multiple myeloma (MM) using an annexin V assay. We demonstrate that all fluoro-thalidomides inhibited the growth of H929 MM cells without any in-vivo activation. Furthermore, we report that the enantiomeric forms of fluoro-thalidomide display different anti-tumour activities, with the (S)-enantiomer being noticeably more potent. The angiogenesis of fluoro-thalidomides is also investigated and compared to thalidomide. The data obtained in this study paves the way towards novel pharmaceutical research on fluoro-thalidomides.
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Grammatoglou K, Bolsakova J, Jirgensons A. C-Quaternary alkynyl glycinols via the Ritter reaction of cobalt complexed alkynyl glycols. RSC Adv 2017. [DOI: 10.1039/c7ra03965d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
A novel approach to C-quaternary alkynyl glycinols based on the Ritter reaction of acetonitrile with cobalt complexed alkynyl glycols is presented.
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Affiliation(s)
| | - J. Bolsakova
- Latvian Institute of Organic Synthesis
- Riga LV-1006
- Latvia
| | - A. Jirgensons
- Latvian Institute of Organic Synthesis
- Riga LV-1006
- Latvia
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6
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Affiliation(s)
| | - Aigars Jirgensons
- Latvian Institute of Organic Synthesis; Aizkraukles 21 1006 Riga Latvia
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7
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Yadav SR, Tiwari VS, Haq W. Stereoselective Synthesis of (R)-3-Methylthalidomide by Piperidin-2-one Ring Assembly Approach. Chirality 2015; 27:619-24. [PMID: 26079113 DOI: 10.1002/chir.22474] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2014] [Revised: 05/05/2015] [Accepted: 05/06/2015] [Indexed: 11/08/2022]
Abstract
A simple and stereoselective synthesis of 3-methylthalidomide, a configurationally stable thalidomide analog, is presented. Herein we describe the synthesis of (R)-3-methylthalidomide starting from (S)-alanine by piperidin-2-one ring assembly approach in high yield and enantiomeric purity without using a chiral auxiliary or reagent. Starting from (R)-alanine, the corresponding (S)-3-methylthalidomide can be prepared using the same methodology.
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Affiliation(s)
- Shyam Raj Yadav
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow, India
| | - Vinay Shankar Tiwari
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow, India.,Academy of Scientific and Innovative Research, New Delhi, India
| | - Wahajul Haq
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow, India.,Academy of Scientific and Innovative Research, New Delhi, India
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8
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Application of tartarate derived bidentate bioxazolines in enantioselective addition of terminal alkynes to imines. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.04.108] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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9
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Miyoshi T, Matsuya S, Tsugawa M, Sato S, Ueda M, Miyata O. Sequential Retro-Ene Arylation Reaction of N-Alkoxyenamides for the Synthesis of tert-Alkylamines. Org Lett 2013; 15:3374-7. [DOI: 10.1021/ol4014238] [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]
Affiliation(s)
- Tetsuya Miyoshi
- Kobe Pharmaceutical University, Motoyamakita, Higashinada, Kobe 658-8558, Japan
| | - Syota Matsuya
- Kobe Pharmaceutical University, Motoyamakita, Higashinada, Kobe 658-8558, Japan
| | - Mikako Tsugawa
- Kobe Pharmaceutical University, Motoyamakita, Higashinada, Kobe 658-8558, Japan
| | - Shohei Sato
- Kobe Pharmaceutical University, Motoyamakita, Higashinada, Kobe 658-8558, Japan
| | - Masafumi Ueda
- Kobe Pharmaceutical University, Motoyamakita, Higashinada, Kobe 658-8558, Japan
| | - Okiko Miyata
- Kobe Pharmaceutical University, Motoyamakita, Higashinada, Kobe 658-8558, Japan
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Morisaki K, Sawa M, Nomaguchi JY, Morimoto H, Takeuchi Y, Mashima K, Ohshima T. Rh-Catalyzed Direct Enantioselective Alkynylation of α-Ketiminoesters. Chemistry 2013; 19:8417-20. [DOI: 10.1002/chem.201301237] [Citation(s) in RCA: 71] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2013] [Indexed: 12/16/2022]
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11
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Katagiri T, Katayama Y, Taeda M, Ohshima T, Iguchi N, Uneyama K. Preparation of Optically Pure α-Trifluoromethyl-α-amino Acids from N-Tosyl-2-trifluoromethyl-2-alkyloxycarbonyl Aziridine. J Org Chem 2011; 76:9305-11. [DOI: 10.1021/jo201554g] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Toshimasa Katagiri
- Department of Applied Chemistry,
Faculty of Engineering, Okayama University, Tsushimanaka 3-1-1 Kita-ku, Okayama,
700-8530, Japan
| | - Yousuke Katayama
- Department of Applied Chemistry,
Faculty of Engineering, Okayama University, Tsushimanaka 3-1-1 Kita-ku, Okayama,
700-8530, Japan
| | - Mayuko Taeda
- Department of Applied Chemistry,
Faculty of Engineering, Okayama University, Tsushimanaka 3-1-1 Kita-ku, Okayama,
700-8530, Japan
| | - Takanori Ohshima
- Department of Applied Chemistry,
Faculty of Engineering, Okayama University, Tsushimanaka 3-1-1 Kita-ku, Okayama,
700-8530, Japan
| | - Naomi Iguchi
- Department of Applied Chemistry,
Faculty of Engineering, Okayama University, Tsushimanaka 3-1-1 Kita-ku, Okayama,
700-8530, Japan
| | - Kenji Uneyama
- Department of Applied Chemistry,
Faculty of Engineering, Okayama University, Tsushimanaka 3-1-1 Kita-ku, Okayama,
700-8530, Japan
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12
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Concise asymmetric synthesis of configurationally stable 4-trifluoromethyl thalidomide. Future Med Chem 2011; 1:897-908. [PMID: 21426088 DOI: 10.4155/fmc.09.63] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND Thalidomide is one of the promising multidimensional drugs that possess high activity against serious diseases such as rheumatoid arthritis, Crohn's disease, leprosy, AIDS and various cancers. However, its medicinal applications are plagued by its configurational instability, as it easily undergoes racemization under the physiological conditions (t(1/2) = 8 h at pH 7.1, 37°C in water). Consequently, the design and synthesis of configurationally stable analogs of thalidomide continue to be an important area of research in bioorganic and medicinal chemistry. DISCUSSION 4-trifuoromethyl thalidomide-3c was identified as an important synthetic target, which was expected to be a configurationally stable analog of thalidomide. Synthetic challenges in preparation of compound 3c were truly multipronged, considering the unique steric, electronic as well as electrostatic characteristics of trifluoromethyl group, significantly affecting properties of parent amino acids. After numerous experiments and unsuccessful attempts, both (3S,4R) and (3R, 4S) enantiomers of 4-trifluoromethyl-substituted thalidomide were effectively synthesized in six steps starting from enantio- and diastereomerically pure 3-(trifluoromethyl)pyroglutamates, prepared by highly diastereoselective Michael addition reactions between achiral glycine equivalents and chiral 3-(trifluoromethyl)acrylate. CONCLUSION We have developed a reliable asymmetric approach for preparation of hitherto unknown 4-trifluoromethyl-substituted thalidomide in (3S,4R) and (3R,4S) enantiomerically pure forms. These thalidomide derivatives were shown to be configurationally stable and therefore may serve as useful lead compounds for the development of a new generation of thalidomide-based pharmaceuticals.
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Konev AS, Abbaspour Tehrani K, Khlebnikov AF, Novikov MS, Magull J. Monofluorinated aziridines in asymmetric synthesis of chiral fluorinated prop-2-yn-1-amines. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2010. [DOI: 10.1134/s1070428010070043] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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14
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Yamamoto T, Tokunaga E, Nakamura S, Shibata N, Toru T. Synthesis and configurational stability of (S)- and (R)-deuteriothalidomides. Chem Pharm Bull (Tokyo) 2010; 58:110-2. [PMID: 20045977 DOI: 10.1248/cpb.58.110] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
3'-Deuteriothalidomide was synthesized and found to be configurationally five times more stable than thalidomide toward racemization at physiological pH.
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Affiliation(s)
- Takeshi Yamamoto
- Department of Frontier Materials, Graduate School of Engineering, Nagoya Institute of Technology, Nagoya, Japan
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15
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Nakamura S, Ohara M, Nakamura Y, Shibata N, Toru T. Copper-Catalyzed Enantioselective Three-Component Synthesis of Optically Active Propargylamines from Aldehydes, Amines, and Aliphatic Alkynes. Chemistry 2010; 16:2360-2. [DOI: 10.1002/chem.200903550] [Citation(s) in RCA: 109] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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16
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Verniest G, Surmont R, Hende EV, Deweweire A, Deroose F, Thuring JW, De Kimpe N. New Entries toward 3,3-Difluoropiperidines. J Org Chem 2008; 73:5458-61. [DOI: 10.1021/jo800768q] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Guido Verniest
- Department of Organic Chemistry, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium, and Johnson & Johnson Pharmaceutical Research & Development, a Division of Janssen Pharmaceutica NV, Turnhoutseweg 30, B-2340 Beerse, Belgium
| | - Riccardo Surmont
- Department of Organic Chemistry, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium, and Johnson & Johnson Pharmaceutical Research & Development, a Division of Janssen Pharmaceutica NV, Turnhoutseweg 30, B-2340 Beerse, Belgium
| | - Eva Van Hende
- Department of Organic Chemistry, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium, and Johnson & Johnson Pharmaceutical Research & Development, a Division of Janssen Pharmaceutica NV, Turnhoutseweg 30, B-2340 Beerse, Belgium
| | - Arvid Deweweire
- Department of Organic Chemistry, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium, and Johnson & Johnson Pharmaceutical Research & Development, a Division of Janssen Pharmaceutica NV, Turnhoutseweg 30, B-2340 Beerse, Belgium
| | - Frederik Deroose
- Department of Organic Chemistry, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium, and Johnson & Johnson Pharmaceutical Research & Development, a Division of Janssen Pharmaceutica NV, Turnhoutseweg 30, B-2340 Beerse, Belgium
| | - Jan Willem Thuring
- Department of Organic Chemistry, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium, and Johnson & Johnson Pharmaceutical Research & Development, a Division of Janssen Pharmaceutica NV, Turnhoutseweg 30, B-2340 Beerse, Belgium
| | - Norbert De Kimpe
- Department of Organic Chemistry, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium, and Johnson & Johnson Pharmaceutical Research & Development, a Division of Janssen Pharmaceutica NV, Turnhoutseweg 30, B-2340 Beerse, Belgium
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Smits R, Cadicamo CD, Burger K, Koksch B. Synthetic strategies to α-trifluoromethyl and α-difluoromethyl substituted α-amino acids. Chem Soc Rev 2008; 37:1727-39. [DOI: 10.1039/b800310f] [Citation(s) in RCA: 218] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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18
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Konev AS, Stas S, Novikov MS, Khlebnikov AF, Abbaspour Tehrani K. Fluoroaziridines as novel substrates in the modified Petasis reaction: synthesis of monofluorinated propargyl amines. Tetrahedron 2008. [DOI: 10.1016/j.tet.2007.10.067] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Yamada T, Okada T, Sakaguchi K, Ohfune Y, Ueki H, Soloshonok VA. Efficient asymmetric synthesis of novel 4-substituted and configurationally stable analogues of thalidomide. Org Lett 2007; 8:5625-8. [PMID: 17107088 DOI: 10.1021/ol0623668] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The preparation of new thalidomide derivatives 4-methyl-(3S,4R)-3a and 4-phenyl-(3S,4S)-3b starting from pyroglutamic acids (2R,3R)-7a and (2R,3S)-7b, possessing an inappropriate stereochemistry, was successfully realized due to stereochemically complete epimerization at the alpha-stereogenic center upon formation of the corresponding N-phthaloyl anhydrides 9a,b. The demonstrated conformational stability of these new thalidomide derivatives provides solid experimental evidence for practical feasibility of the approach described here to overcome the inherent problem of configurational instability of thalidomide by introducing an alkyl or aryl group in the C4 position. [reaction: see text].
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Affiliation(s)
- Takeshi Yamada
- Graduate School of Science, Osaka City University, Japan
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Díez R, Badorrey R, Díaz-de-Villegas MD, Gálvez JA. Highly Stereoselective Synthesis of Stereochemically Defined Polyhydroxylated Propargylamines by Alkynylation ofN-Benzylimines Derived from (R)-Glyceraldehyde. European J Org Chem 2007. [DOI: 10.1002/ejoc.200601011] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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21
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Wu TR, Chong JM. Asymmetric synthesis of propargylamides via 3,3'-disubstituted binaphthol-modified alkynylboronates. Org Lett 2006; 8:15-8. [PMID: 16381556 DOI: 10.1021/ol0523087] [Citation(s) in RCA: 85] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text] Alkynylboronates derived from 3,3'-disubstituted-2,2'-binaphthols react with various N-acylimines to give the expected chiral propargylamides with up to 99% ee. This new methodology was applied to the first enantioselective synthesis of the antitubulin agent (-)-N-acetylcolchinol.
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Affiliation(s)
- T Robert Wu
- Guelph-Waterloo Centre for Graduate Work in Chemistry and Biochemistry, (GWC), Department of Chemistry, University of Waterloo, Ontario, Canada
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Barnhart WW, Gahm KH, Thomas S, Notari S, Semin D, Cheetham J. Supercritical fluid chromatography tandem-column method development in pharmaceutical sciences for a mixture of four stereoisomers. J Sep Sci 2005; 28:619-26. [PMID: 15912730 DOI: 10.1002/jssc.200500005] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
A tandem-column method using Chiralpak AD-H and Chiralcel OD-H columns was achieved for baseline separation of a mixture of chiral pharmaceutical compounds (i.e., four stereoisomers) via supercritical fluid chromatography (SFC) with a mobile phase consisting of 90% liquid carbon dioxide and 10% ethanol:isopropanol (50:50 v/v). On the contrary, this mixture (mixture A) could not be baseline separated by SFC conditions explored with individual Chiralpak AD-H and Chiralcel OD-H columns. The effects of various mobile phases on elution order, capacity factor, selectivity, and resolution were determined with mixture A on the individual aforementioned columns to develop the tandem-column method.
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Affiliation(s)
- Wesley W Barnhart
- Discovery Analytical Sciences, Molecular Structure, Amgen Inc., Thousand Oaks, CA 91320, USA.
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Popović-Đorđević JB, Ivanović MD, Kiricojević VD. A novel tandem process leading to functionalized glutarimides. Tetrahedron Lett 2005. [DOI: 10.1016/j.tetlet.2005.02.087] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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25
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Knepper K, Ziegert RE, Bräse S. Solid-phase synthesis of isoindolinones and naturally-occurring benzobutyrolactones (phthalides) using a cyclative-cleavage approach. Tetrahedron 2004. [DOI: 10.1016/j.tet.2004.05.111] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Spanedda MV, Ourévitch M, Crousse B, Bégué JP, Bonnet-Delpon D. Vinylogous Mannich reactions. Additions of trimethylsilyloxyfuran to fluorinated aldimines. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2004.05.003] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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