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Abstract
Prochiral hydrazones undergo efficient and highly selective hydrogenation in the presence of a chiral diphosphine ruthenium catalyst, yielding enantioenriched hydrazine products (up to 99% ee). The mild reaction conditions and broad functional group tolerance of this method allow access to versatile chiral hydrazine building blocks containing aryl bromide, heteroaryl, alkyl, cycloalkyl, and ester substituents. This method was also demonstrated on >150 g scale, providing a valuable hydrazine intermediate en route to an active pharmaceutical ingredient.
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Affiliation(s)
- Christopher H Schuster
- Department of Process Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - James F Dropinski
- Department of Process Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Michael Shevlin
- Department of Process Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Hongming Li
- Department of Process Research and Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Song Chen
- Department of Synthetic Chemistry, Pharmaron Beijing Co., Ltd., No. 6, Tai-He Road, BDA, Beijing, 100176, P. R. China
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2
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Qu Y, Tsuneishi C, Tateno H, Matsumura Y, Atobe M. Green synthesis of α-amino acids by electrochemical carboxylation of imines in a flow microreactor. REACT CHEM ENG 2017. [DOI: 10.1039/c7re00149e] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new approach for the green synthesis of α-amino acids using electrochemical carboxylation of imines in a flow microreactor is described.
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Affiliation(s)
- Yang Qu
- Department of Environment and System Sciences
- Yokohama National University
- Yokohama
- Japan
| | - Chiaki Tsuneishi
- Department of Environment and System Sciences
- Yokohama National University
- Yokohama
- Japan
| | - Hiroyuki Tateno
- Department of Environment and System Sciences
- Yokohama National University
- Yokohama
- Japan
| | - Yoshimasa Matsumura
- Department of Chemistry and Chemical Engineering
- Faculty of Engineering
- Yamagata University
- Yonezawa
- Japan
| | - Mahito Atobe
- Department of Environment and System Sciences
- Yokohama National University
- Yokohama
- Japan
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3
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Yang L, Melot R, Neuburger M, Baudoin O. Palladium(0)-catalyzed asymmetric C(sp 3)-H arylation using a chiral binol-derived phosphate and an achiral ligand. Chem Sci 2016; 8:1344-1349. [PMID: 28451275 PMCID: PMC5360168 DOI: 10.1039/c6sc04006c] [Citation(s) in RCA: 102] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2016] [Accepted: 10/08/2016] [Indexed: 12/22/2022] Open
Abstract
High enantioselectivities can be achieved using an appropriate chiral base/achiral ligand combination in Pd0-catalyzed C(sp3)–H activation.
The first efficient palladium(0)-catalyzed enantioselective C(sp3)–H activation reaction using a catalytic chiral base and an achiral phosphine ligand is reported. Fine-tuning the binol-derived phosphoric acid pre-catalyst and the reaction conditions was found to be crucial to achieve high levels of enantioselectivity for a variety of indoline products containing both tri- and tetrasubstituted stereocenters.
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Affiliation(s)
- Lei Yang
- University of Basel , Department of Chemistry , St. Johanns-Ring 19 , CH-4056 Basel , Switzerland .
| | - Romain Melot
- University of Basel , Department of Chemistry , St. Johanns-Ring 19 , CH-4056 Basel , Switzerland .
| | - Markus Neuburger
- University of Basel , Department of Chemistry , St. Johanns-Ring 19 , CH-4056 Basel , Switzerland .
| | - Olivier Baudoin
- University of Basel , Department of Chemistry , St. Johanns-Ring 19 , CH-4056 Basel , Switzerland .
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4
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Wangweerawong A, Hummel JR, Bergman RG, Ellman JA. Preparation of Enantiomerically Pure Perfluorobutanesulfinamide and Its Application to the Asymmetric Synthesis of α-Amino Acids. J Org Chem 2016; 81:1547-57. [PMID: 26844947 DOI: 10.1021/acs.joc.5b02700] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A high yielding and practical two-step synthesis of enantiomerically pure perfluorobutanesulfinamide from Senanayake's 2-aminoindanol-derived sulfinyl transfer reagent was developed and carried out on a multigram scale. Straightforward condensation of this sulfinamide with ethyl glyoxylate provided the N-perfluorobutanesulfinyl imino ester. The utility of this activated N-sulfinyl imino ester was demonstrated for reactions that gave either no product or very low yields with the corresponding less electrophilic N-tert-butanesulfinyl derivative. Specifically, the Rh(III)-catalyzed C-H bond addition of aromatic compounds to the N-perfluorobutanesulfinyl imino ester provided arylglycines with very high diastereoselectivities for a range of directing groups including pyrrolidine amide, azo, sulfoximine, 1-pyrazole, and 1,2,3-triazole functionalities. Thermal asymmetric aza-Diels-Alder reactions also proceeded in good yields and with high selectivity, including for the substituted dienes (E)-1,3-pentadiene and (2E,4E)-2,4-hexadiene.
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Affiliation(s)
- Apiwat Wangweerawong
- Department of Chemistry, Yale University , 225 Prospect Street, New Haven, Connecticut 06520-8170, United States
| | - Joshua R Hummel
- Department of Chemistry, Yale University , 225 Prospect Street, New Haven, Connecticut 06520-8170, 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 , 225 Prospect Street, New Haven, Connecticut 06520-8170, United States
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Nokubi T, Kindt S, Clark T, Kamimura A, Heinrich MR. Synthesis of dibenzo[c,e][1,2]diazocines—a new group of eight-membered cyclic azo compounds. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2014.11.064] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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6
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Green BS, Hagler AT, Rabinsohn Y, Rejtõ M. Photochemical Asymmetric Synthesis. Irradiation of Ring and Open-chain Derivatives of L-Erythritol 1,4-Dicinnamate. Isr J Chem 2013. [DOI: 10.1002/ijch.197600025] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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7
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Mazgarova GG, Suponitskii KY, Gataullin RR. Effect of salts on the reaction direction of (2R*,3R*)-2-[(1R*)-1-iodoethyl)]-3-methyl(3,5-dimethyl)-1-(4-methylphenylsulfonyl)-2,3-dihydro-1H-indoles with dimethylformamide. Russ J Org Chem 2013. [DOI: 10.1134/s1070428013090133] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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8
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Cheng L, Liu L, Li C, Jia H, Wang D, Chen YJ. Nucleophilic addition of regioselectively lithiated indoline with aldimines for the syntheses of 2- and 7-indolinyl methanamine derivatives. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.05.119] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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9
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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] [What about the content of this article? (0)] [Affiliation(s)] [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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11
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Abstract
A de novo preparation of alpha-keto-imides via ynamide oxidation is described. With a number of alkyne oxidation conditions screened, a highly efficient RuO2-NaIO4 mediated oxidation and a DMDO oxidation have been identified to tolerate a wide range of ynamide types. In addition to accessing a wide variety of alpha-keto-imides, the RuO2-NaIO4 protocol provides a novel entry to the vicinal tricarbonyl motif via oxidation of push-pull ynamides, and imido acylsilanes from silyl-substituted ynamides. Chemoselective oxidation of ynamides containing olefins can be achieved by using DMDO, while the RuO2-NaIO4 protocol is not effective. These studies provide further support for the synthetic utility of ynamides.
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Affiliation(s)
- Ziyad F Al-Rashid
- Division of Pharmaceutical Sciences and Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53705, USA.
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13
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Schichl DA, Enthaler S, Holla W, Riermeier T, Kragl U, Beller M. Dynamic Kinetic Resolution of α-Amino Acid Esters in the Presence of Aldehydes. European J Org Chem 2008. [DOI: 10.1002/ejoc.200800253] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [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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Affiliation(s)
- Il Suk Byun
- a Department of Chemistry , Korea Advanced Institute of Science and Technology , 373-1, Kusong Dong, Yusong Gu, Taejon , 305-701 , Korea
| | - Yong Hae Kim
- a Department of Chemistry , Korea Advanced Institute of Science and Technology , 373-1, Kusong Dong, Yusong Gu, Taejon , 305-701 , Korea
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17
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Casper DM, Kieser D, Blackburn JR, Hitchcock SR. Synthesis of 3,4,5,6‐Tetrahydro‐2H‐1,3,4‐oxadiazin‐2‐ones Employing a Metal Hydride and Diethyl Carbonate: An Alternative Cyclization Method over 1,1′‐Carbonyldiimidazole. SYNTHETIC COMMUN 2006. [DOI: 10.1081/scc-120028356] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- David M. Casper
- a Department of Chemistry , Illinois State University , Normal, Illinois, 61790‐4160, USA
| | - David Kieser
- a Department of Chemistry , Illinois State University , Normal, Illinois, 61790‐4160, USA
| | - Jennifer R. Blackburn
- a Department of Chemistry , Illinois State University , Normal, Illinois, 61790‐4160, USA
| | - Shawn R. Hitchcock
- a Department of Chemistry , Illinois State University , Normal, Illinois, 61790‐4160, USA
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18
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Andersson F, Hedenström E. Synthesis of two (S)-indoline-based chiral auxiliaries and their use in diastereoselective alkylation reactions. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.tetasy.2006.07.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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19
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Pichat L, Tostain J, Gomis JM, Coppo M, Moustier AM, Vincent M, Remond G, Portevin B, Laubie M. Syntheses Du S 9490-3: Sel De Terbutylamine De l'Acide {[Carbethoxy-1 (1S) Butyl Amino] OXO-1 (2S) Propyl} (2S, 3aS, 7aS) Perhydro Indole - Carboxylique-2 [Cyclohexyl -14C-U], du S 9780 : Acide {[Carboxy-1 (1S) Butyl Amino] OXO-1 (2S) Propyl} (2S, 3aS, 7a. J Labelled Comp Radiopharm 2006. [DOI: 10.1002/jlcr.2580250509] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Jäger V, Grund H, Schwab W. Ring-Opening of 5-(Bromomethyl)-2-isoxazolines to β,γ-Enoximes-A New Principle for the γ-Substitution of Allyl Bromides by α-Functionalized Alkyl Groups. ACTA ACUST UNITED AC 2003. [DOI: 10.1002/anie.197900781] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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22
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Schöllkopf U, Hausberg HH, Hoppe I, Segal M, Reiter U. Asymmetric Synthesis of α-Alkyl-α-aminocarboxylic Acids by Alkylation of 1-chiral-Substituted 2-Imidazolin-5-ones. ACTA ACUST UNITED AC 2003. [DOI: 10.1002/anie.197801171] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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23
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Ionescu RD, Blom A, Frejd T. Phenylalanine derivatives as catalysts in the enantioselective addition of diethylzinc to benzaldehydes. ACTA ACUST UNITED AC 2003; 14:2369-80. [DOI: 10.1016/s0957-4166(03)00497-x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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24
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Casper DM, Nora GP, Blackburn JR, Bentley JT, Taylor DC, Hitchcock SR. Synthesis of N4-substituted[1,3,4]oxadiazinan-2-ones derived from norephedrine. J Heterocycl Chem 2002. [DOI: 10.1002/jhet.5570390431] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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25
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Hitchcock SR, Nora GP, Casper DM, Squire MD, Maroules CD, Ferrence GM, Szczepura LF, Standard JM. X-Ray crystallographic and 13C nuclear magnetic resonance studies of 3,4,5,6-tetrahydro-2H-1,3,4-oxadiazin-2-ones derived from ephedrine and pseudoephedrine. Tetrahedron 2001; 57:9789-98. [DOI: 10.1016/s0040-4020(01)00967-x] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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26
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Diego-Castro MJ, Hailes HC, Lawrence MJ. Synthesis and Characterization of Optically Active Surfactants Derived from Phenylalanine and Leucine. J Colloid Interface Sci 2001; 234:122-126. [PMID: 11161498 DOI: 10.1006/jcis.2000.7285] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Two optically active cationic surfactants, (2S)-N-hexadecyl-N, N-dimethyl-(1-hydroxy-3-phenylpropyl)-2-ammonium chloride 1 and (2S)-N-hexadecyl-N,N-dimethyl-(1-hydroxy-4-methylpentyl)-2-ammonium chloride 2, have been selected and synthesized for use as enantioselective micellar catalysts in aqueous media. Their surface and aggregation behavior has been investigated at 298 K using surface tension and light scattering studies, which revealed that both molecules associate at low concentrations to produce micellar aggregates. Interestingly, although the area per molecule occupied by the surfactants at the air-water interface (43.6 Å(2) for 1 and 54.6 Å(2) for 2) is similar to that of related cationic surfactants, their aggregation number (23 for 1 and 19 for 2) is much smaller, perhaps reflecting the influence of the size or homochiral nature of the head group in the packing of the micelle. Copyright 2001 Academic Press.
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Hitchcock SR, Nora GP, Hedberg C, Casper DM, Buchanan LS, Squire MD, West DX. X-Ray Crystallographic and Proton Nuclear Magnetic Resonance Studies of β-Hydroxy-N-nitrosamines derived from α-Amino Acids and Ephedrine. Tetrahedron 2000. [DOI: 10.1016/s0040-4020(00)00837-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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28
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Abstract
Chiral hydrazones 1 reacted with aryl- or alkyl-lithiums at -78 degrees C in a short reaction time, within 10 min, to afford arylated or alkylated chiral hydrazines 3 with extremely high diastereoselectivity (up to >99% de) and high chemical yields. The hydrazines are readily converted to chiral amino alcohols 4.
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Affiliation(s)
- S W Youn
- Department of Chemistry, Korea Advanced Institute of Science and Technology, Taejon, Korea
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29
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Choudary B, Lakshmi Kantam M, Lakshmi Santhi P. New and ecofriendly options for the production of speciality and fine chemicals. Catal Today 2000; 57:17-32. [DOI: 10.1016/s0920-5861(99)00307-7] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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30
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Zhang C, Ito H, Maeda Y, Shirai N, Ikeda SI, Sato Y. Novel Isomerization Reaction of N,N-Dimethyl-α-(methoxycarbonyl)-4-substituted- benzylammonium N-Methylides. J Org Chem 1998. [DOI: 10.1021/jo981729h] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Chen Zhang
- Faculty of Pharmaceutical Sciences, Nagoya City University, Tanabe-dori, Mizuho-ku, Nagoya 467-8603, Japan
| | - Hiroto Ito
- Faculty of Pharmaceutical Sciences, Nagoya City University, Tanabe-dori, Mizuho-ku, Nagoya 467-8603, Japan
| | - Yasuhiro Maeda
- Faculty of Pharmaceutical Sciences, Nagoya City University, Tanabe-dori, Mizuho-ku, Nagoya 467-8603, Japan
| | - Naohiro Shirai
- Faculty of Pharmaceutical Sciences, Nagoya City University, Tanabe-dori, Mizuho-ku, Nagoya 467-8603, Japan
| | - Shin-ichi Ikeda
- Faculty of Pharmaceutical Sciences, Nagoya City University, Tanabe-dori, Mizuho-ku, Nagoya 467-8603, Japan
| | - Yoshiro Sato
- Faculty of Pharmaceutical Sciences, Nagoya City University, Tanabe-dori, Mizuho-ku, Nagoya 467-8603, Japan
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Ferey V, Vedrenne P, Toupet L, Le Gall T, Mioskowski C. Asymmetric Synthesis of alpha-Alkylproline Derivatives from a Chiral Borane-Amine Adduct: Inversion of Enantioselectivity in the Presence of a Crown Ether. J Org Chem 1996; 61:7244-7245. [PMID: 11667643 DOI: 10.1021/jo961432o] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Vincent Ferey
- CEA-Saclay, Service des Molécules Marquées, Bât. 547, Département de Biologie Cellulaire et Moléculaire, F-91191 Gif-sur-Yvette cedex, France, Groupe Matière Condensée et Matériaux, Bât. 11 B, Département de Physique Cristalline, Université de Rennes 1, Campus de Beaulieu, 35042 Rennes cedex, France, and Faculté de Pharmacie, Université Louis-Pasteur, Laboratoire de Synthèse Bio-Organique associé au CNRS, Faculté de Pharmacie, 74 route du Rhin, BP 24, F-67401 Illkirch, France
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33
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Kim YH, Choi JY. Diastereoselective addition of organolithiums to new chiral hydrazones. Enantioselective synthesis of (R)-coniine. Tetrahedron Lett 1996. [DOI: 10.1016/0040-4039(96)01151-3] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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34
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Klopman G, Fercu D, Jacob J. Computer-aided study of the relationship between structure and antituberculosis activity of a series of isoniazid derivatives. Chem Phys 1996. [DOI: 10.1016/0301-0104(95)00415-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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35
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Affiliation(s)
- David J. Ager
- NSC Technologies, and NutraSweet Kelco Units of Monsanto, 601 East Kensington Road, Mount Prospect, Illinois 60056
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36
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Ferey V, Toupet L, Le Gall T, Mioskowski C. Chirale Boran-Amin-Addukte in der asymmetrischen Synthese: Alkylierung von Alaninderivaten. Angew Chem Int Ed Engl 1996. [DOI: 10.1002/ange.19961080418] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Kim YH, Byun IS, Choi JY. Highly diastereoselective addition of organometallics to novel chiral α-ketoamides of (S)-2-methoxymethylindoline. ACTA ACUST UNITED AC 1995; 6:1025-6. [DOI: 10.1016/0957-4166(95)00115-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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39
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Mehler T, Behnen W, Wilken J, Martens J. Enantioselective catalytic reduction of acetophenone with borane in the presence of cyclic α-amino acids and their corresponding β-amino alcohols. ACTA ACUST UNITED AC 1994. [DOI: 10.1016/s0957-4166(00)86168-6] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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42
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Cativiela C, Diaz-De-Villegas MD, Galvez JA. Chiral 2-Cyanocinnamates in Conjugate Addition Asymmetric Enolate Trapping Reactions. BCSJ 1992. [DOI: 10.1246/bcsj.65.1657] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Martens J, Dauelsberg C, Behnen W, Wallbaum S. Enantioselective catalytic borane reductions of achiral ketones: Syntheses and application of two chiral β-amino alcohols from (S)-2-indoline carboxylic acid. ACTA ACUST UNITED AC 1992; 3:347-50. [DOI: 10.1016/s0957-4166(00)80271-2] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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46
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Classon B, Garegg PJ, Lindh I. Synthesis of p-trifluoroacetamidophenyl beta-D-glucopyranoside 4-(D-ribit-5-yl phosphate) corresponding to the Haemophilus influenzae type A capsular antigen. Carbohydr Res 1988; 179:31-5. [PMID: 3264756 DOI: 10.1016/0008-6215(88)84107-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The synthesis is described of the title glycoside which corresponds to the Haemophilus influenzae type a capsular antigen. The hydrogenphosphonate method was used with 3,3'-(chlorophosphonylidene)bis(2-oxo-1,3-oxazolidene) as the condensing agent.
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Affiliation(s)
- B Classon
- Department of Organic Chemistry, Arrhenius Laboratory, University of Stockholm, Sweden
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Norberg T, Walding M. Synthesis of 2-(p-trifluoroacetamidophenyl)ethylO-?-l-fucopyranosyl-(1?3)-O-(2-acetamido-2-deoxy-?-d-glucopyranosyl) (1?3)-O-?-d-galactopyranosyl-(1?4)-?-d-glucopyranoside, a tetrasaccharide fragment of a tumour-associated glycosphingolipid. Glycoconj J 1988; 5:137-43. [DOI: 10.1007/bf01061202] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Duhamel L, Duhamel P, Fouquay S, Eddine JJ, Peschard O, Plaquevent J, Ravard A, Solliard R, Valnot J, Vincens H. Enantioselective electrophilic bond construction to the α-carbon of α-aminoacids. Tetrahedron 1988; 44:5495-506. [DOI: 10.1016/s0040-4020(01)86055-5] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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