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p. 992
Published: 10 August 2000
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| Download PDF Full-text (5 KB) Abstract: n/a
p. 993-997
Received: 29 June 2000 / Accepted: 1 August 2000 / Published: 5 August 2000
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| Download PDF Full-text (30 KB) Abstract: The Jacobsen and pybox type ligands effect chiral induction in the presence of niobium(V) chloride and tantalum(V) chloride in the Lewis acid catalysed Diels–Alder reaction.
p. 998-1003
Received: 10 March 2000; in revised form: 7 July 2000 / Accepted: 31 July 2000 / Published: 9 August 2000
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| Download PDF Full-text (55 KB) Abstract: The acid-catalyzed ring-opening of methyl (+)-(1'R, 2R) and (-)-(1'R, 2S)-1-(2-phenylethanol) aziridine-2-carboxylates (1) and (2) lead quantitatively to the corresponding 2(S)-(-)-chloro-3-[2'-hydroxy-1'(R)-phenyl-ethylamino] propionic acid methyl ester (3) and 2(R)-(-)-chloro-3-[2'-hydroxy-1'(R)-phenyl-ethylamino] propionic acid methyl ester (4) hydrochlorides.
p. 1004-1010
Received: 28 January 2000; in revised form: 21 July 2000 / Accepted: 1 August 2000 / Published: 9 August 2000
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| Download PDF Full-text (39 KB) Abstract: FVP of the title oxazole (1) at 1000o C and 0.5 mm Hg afforded a complex reaction mixture containing benzonitrile, phenylacetonitrile, biphenyl, diphenylmethane, fluorene, o -benzylbenzonitrile (major product, 22%), phenanthrene, anthracene, 9,10-anthraquinone, 2-phenylindole and 3-phenylindole. A radical and carbene mechanism was suggested in order to rationalize the formation of the reaction products.
p. 1011-1013
Received: 29 June 2000 / Accepted: 10 August 2000 / Published: 15 August 2000
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| Download PDF Full-text (17 KB) Abstract: 1,3,2-Dithioborolans substituted at the 2-position with various homochiral groups can act as chiral Lewis acids in the Diels-Alder reaction between crotonaldehyde or methacrolein with cyclopentadiene. The endo:exo selectivities obtained were good although the enantiomeric excesses were low to moderate.
p. 1014-1017
Received: 7 March 2000; in revised form: 10 August 2000 / Accepted: 11 August 2000 / Published: 15 August 2000
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| Download PDF Full-text (20 KB) Abstract: A method of synthesizing bioactive potassium (1,1-dioxothiolan-3-yl) dithiocarbamate in high yield and purity is reported.
p. 1018-1032
Received: 14 February 2000; in revised form: 31 July 2000 / Accepted: 1 August 2000 / Published: 20 August 2000
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| Download PDF Full-text (123 KB) Abstract: Soluble polymer-supported chemistry is a technology that allows the blending of the benefits of polymer-supported synthesis and solution-phase chemistry. Herein, we describe our recent efforts in this area targeted at exploring the scope of poly(ethylene glycol) (PEG) as the matrix. Specifically we describe the use of PEG as a support for triphenyl phosphine and for the Stille reaction.
p. 1033-1050
Received: 22 February 2000; in revised form: 21 July 2000 / Accepted: 8 August 2000 / Published: 23 August 2000
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| Download PDF Full-text (102 KB) Abstract: A review of the use of the Claisen, Cope and related [3,3]-sigmatropic rearrangements, sequential ("tandem") sigmatropic rearrangements and the "ene" reaction in the syntheses of flavour and fragrance compounds is presented.
p. 1051-1054
Received: 3 April 2000; in revised form: 28 July 2000 / Accepted: 1 August 2000 / Published: 28 August 2000
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| Download PDF Full-text (25 KB) Abstract: Synthesis of enantiopure pheromones I and II, both of them bearing chiral methyl branching and an α-oxygenated carbon centre, has been accomplished using compound 2 prepared from D-mannitol as the chiral precursor.
Displaying article 1-9
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