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Synthesis of oxazolidine derivatives of β-[3-(aryloxy) aryl]-α-amino acids by application of the Diels-Alder reaction
: Olsen, Richard K.; Feng, Xianqi Tetrahedron Letters, 1991 , vol. 32, # 41 p. 5721 - 5724
Abstract The Diels-Alder reaction has been used to construct the diaryl ether unit in oxazolidine derivatives of β-[3-(aryloxy) aryl]-α-amino acids. Cycloaddition of acetylenic ketone 6 with substituted aryloxy dienes, and subsequent aromatization, provided t... |
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A highly enantioselective synthesis of (R)-and (S)-5, 7-odimethyleucomol
: Davis, Franklin A.; Chen, Bang-Chi Tetrahedron Letters, 1990 , vol. 31, # 47 p. 6823 - 6826
Abstract Both (R)-and (S)-5, 7-O-dimethyleucomol 1b (R= Me) were synthesized in 57% overall yield in> 96% enantiomeric excess. The key step involves the enantioselective α hydroxylation of the lithium enolate of 8 by readily available (+)-and (−)-[(8, 8- dime... |
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Regiospecific arlation by acid/base controlled reactions of tetraphenylbismuth esters
: Barton, Derek H. R.; Charpiot, Brigitte; Motherwell, William B. Tetrahedron Letters, 1982 , vol. 23, # 33 p. 3365 - 3368
Tetrahedron Letters,Vol.23,No.33,pp 3365-3368,1982 0040-4039/82/333365-04$03.00/O Printed in Great Britain ... Derek HR Barton, Brigitte Charpiot and William B. Motherwell* (Institut de Chimie des Substances Naturelles, CNRS, 91190 Gif-sur-Yvette, France) ...... |
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Para-selective mononitration of alkylbenzenes under mild conditions by use of benzoyl nitrate in the presence of a zeolite catalyst
: Smith, Keith; Fry, Karl; Butters, Michael; Nay, Barry Tetrahedron Letters, 1989 , vol. 30, # 39 p. 5333 - 5336
Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... Toluene and other alkylbenzenes are mononitrated in essentially q... |
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Base-promoted oxygenation of N-substituted-N-tosylhydrazines--a convenient route to hydroxydeamination of primary amines
: Tetrahedron Letters, , vol. 33, # 49 p. 7465 - 7468
... JavaScript is disabled on your browser. Please enable JavaScript to use all the features on this page. Tetrahedron Letters. Volume 33, Issue 49, 1992, Pages 7465–7468. The International Journal for the Rapid Publication of Preliminary Communications in Or... |
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Syntheses of all four possible diastereomers of the acyclonucleoside 9-(1, 3, 4-trihydroxy-2-butoxymethyl) guanine from carbohydrate precursors
: MacCoss, Malcolm; Chen, Anna; Tolman, Richard L. Tetrahedron Letters, 1985 , vol. 26, # 36 p. 4287 - 4290
This document does not have an outline. ... JavaScript is disabled on your browser. Please enable JavaScript to use all the features on this page. ... Author links open the overlay panel. Numbers correspond to the affiliation list which can be exposed by usin... |
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Synthèse D'α, β-fluoroamines à partir d'aziridines: orientation de l'ouverture du cycle et amélioration du pouvoir fluorant du réactif de olah
: Alvernhe, Gerard; Lacombe, Sylvie; Laurent, Andre Tetrahedron Letters, 1980 , vol. 21, p. 289 - 292
Résumé Ring opening of aliphatic and aromatic aziridines by addition of Olah's reagent has been studied. Yields and regioselectivity are improved when using the corresponding N- activated aziridines and less acidic fluorinating reagents obtained by addition o... |
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Direct NMR spectroscopic proof for the ring-chain tautomerism in the thiazolidine system
: Fueloep, Ferenc; Mattinen, Jorma; Pihlaja, Kalevi Tetrahedron Letters, 1988 , vol. 29, # 42 p. 5427 - 5428
Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... 2-(2′-Hydroxy-5′-bromophenyl)-benzothiazoline exists as a ring-ch... |
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A new synthesis of substituted spiro butyrolactones via dyotropic rearrangement
: Black, T.Howard; DuBay III, William J. Tetrahedron Letters, 1987 , vol. 28, # 41 p. 4787 - 4788
Spiro lactones y attracted mch attention in recent years, and many methods are known for their synthesis. These procedures, however, typically afford only unsubstituted lactones, so that if conpounds bearing substituents alpha to the carbonyl are desired &qac... |
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A biomimetic approach to the synthesis of rocaglamide based on a photochemical [2+ 2] cycloaddition of a cinnamate unit to a flavone.
: Tetrahedron Letters, , vol. 34, # 33 p. 5313 - 5316
Page 1. Temhedmn Letters. Vol. 34. No. 33. pp 53134316.1993 PlhtCdinGlWtBlith 00404039193 56.00 + .OO Pcrg- Rcss Lad A Biomimetic Approach to the Synthesis of Rocaglamide Based on a Photochemical [2+2] Cycbaddition of a Cinnamate Unit to a Flavone. ... |