86381-47-7Relevant academic research and scientific papers
A flexible synthesis of some polysubstituted cyclopentanes from quinic acid
Teresa Barros,Santos, Antonio G.,Godinho, Licio S.,Maycock, Christopher D.
, p. 3999 - 4002 (2007/10/02)
Quinic acid is converted stereoselectively into a common cyclopentane intermediate useful for the synthesis of carbocyclic nucleosides prostaglandins and other important cyclopentane based compounds.
Studies Related to Cyclopentanoid Natural Products. Part 3. Synthesis of Pentenomycin and its Racemate
Hetmanski, Michael,Purcell, Neil,Stoodley, Richard J.,Palfreyman, Malcolm N.
, p. 2089 - 2096 (2007/10/02)
(4R)-4-Benzyloxy-2-benzyloxymethylcyclopent-2-en-1-one (9b) reacted with osmium(VIII) oxide to give (2S,3S,4R)-4-benzyloxy-2-benzyloxymethyl-2,3-dihydroxycyclopentan-1-one (8b), the cis-hydroxylation occurring anti to the 4-benzyloxy group.By a hydrogenolysis-dehydration sequence, compound (8b) was converted into pentenomycin (1a).Although the optical rotations of the synthetic pentenomycin (1a) and its 4,5,6-tri-O-acetyl, 2-bromo-4,5,6-tri-O-acetyl, and 6-O-benzyl derivatives (13a), (13b), and (1d), were substantially different from those reported in the literature, the compounds were shown to be enantiomerically pure.When treated with t-butyldimethylsilyl chloride, (8R)-8-hydroxy-6-hydroxymethyl-1,4-thiaspiro-non-6-ene (10b) was converted into its disilyl ether (10f).The last-cited compound reacted with benzeneseleninic anhydride to give (4R)-4-t-butyldimethylsilyloxy-2-t-butyldimethylsilyloxymethylcyclopent-2-en-1-one (9d), which was converted into pentenomycin (1a) by sequential reactions involving osmium(VIII) oxide and hydrochloric acid.The racemate of compound (9d), prepared from the racemate of 4-hydroxy-2-hydroxymethylcyclopent-2-en-1-one (9c) by reaction with t-butyldimethylsilyl chloride, was similarly transformed into the racemate of pentenomycin (1a).
Studies Related to Cyclopentanoid Natural Products. Part 2. An Improved Route to (4R)-4-Hydroxy-2-hydroxymethylcyclopent-2-en-1-one and its O-Substituted Derivatives
Elliott, John D.,Kelson, Andrew B.,Purcell, Neil,Stoodley, Richard J.,Palfreyman, Malcolm N.
, p. 2441 - 2449 (2007/10/02)
(3R,4S,5R)-3,4-O-Cyclohexylidene-3,4,5-trihydroxycyclohexan-1-one (11a), prepared from D-quinic acid (4a) by a published three-step sequence, was converted into the 5-O-benzoyl derivative (11b) by the action of benzoyl chloride.Simultaneous protection of the ketonic carbonyl group and removal of the cyclohexylidene moiety occurred when the compound (11b) was treated with ethane-1,2-dithiol and boron trifluoride-diethyl ether.The derived (7R,8R,9R)-9-benzoyloxy-7,8-dihydroxy-1,4-dithiaspirodecane (15a), when treated sequentially with lead(IV) acetate and pyrrolidinium acetate, underwent an oxidative ring contraction to give (8R)-8-benzoyloxy-1,4-dithiaspironon-6-ene-6-carbaldehyde (17a). The aldehyde (17a) reacted with lithium aluminium hydride to give (8R)-8-hydroxy-6-hydroxymethyl-1,4-dithiaspironon-6-ene (18a) and with sodium cyanoborohydride to yield (8R)-8-benzoyloxy-6-hydroxymethyl-1,4-dithiaspironon-6-ene (18b).Sodium methoxide effected the transformation of the hydroxybenzoate (18b) into the diol (18a) which underwent benzylation with benzyl bromide to give the dibenzyl ether (18c).Benzoylation of the hydroxybenzoate (18b), to give the dibenzoate (18d), was achieved by the action of benzoyl chloride.Removal of the dithiolane moiety from compounds (18a-d), to give the cyclopent-2-en-1-ones (1a-d), was brought about by copper(II) chloride-copper(II) oxide. The cyclohexanone (11b) also reacted with propane-1,3-dithiol and boron trifluoride-diethyl ether to give (8R,9R,10R)-10-benzoyloxy-8,9-dihydroxy-1,5-dithiaspiroundecane (20), which underwent an oxidative ring contraction to (9R)-9-benzoyloxy-1,5-dithiaspirodec-7-ene-7-carbaldehyde (22) when treated with lead(IV) acetate followed by dibenzylamine trifluoroacetate. The outcome of the reaction of the cyclohexanone (11b) with ethane-1,2-diol depended upon the reaction conditions.In refluxing benzene and in the presence of toluene-p-sulphonic acid, 1-hydroxy-4-(2-hydroxyethoxy)benzene (24) was formed.At room temperature and in the presence of sulphuric acid, (7R,8R,9R)-9-benzyloxy-7,8-dihydroxy-1,4-dioxaspirodecane (15c) was the major product.Although the oxidative ring contraction of the last-mentioned derivative was also effected by the action of lead(IV) acetate followed by dibenzylamine trifluoroacetate, the resultant (8R)-8-benzoyloxy-1,4-dioxaspironon-6-ene-6-carbaldehyde (17c) was an unstable entity. Compounds (17a) and (22) inhibited the growth of Staphylococcus aureus at concentrations of 2 and 32 μg cm-3, respectively.
Synthesis of Enantiomerically Pure Substituted Cyclopentenes from (-)-Quinic Acid
Barriere, Jean-Claude,Cleophax, Jeanine,Gero, Stephan D.,Vuilhorgne, Marc
, p. 296 - 307 (2007/10/02)
The synthesis of a large variety of enantiomerically pure substituted reactive cyclopentenes 16, 23, 24 and 28 have been synthesized from the readily available (-)-quinic acid 1.The straightforward strategy involves a high-yielding intramolecular aldoliza
Syntheses of (±)-and (-)-pentenomycin I
Elliott,Hetmanski,Palfreyman,et al.
, p. 965 - 968 (2007/10/02)
Syntheses of the cyclopentanoid antibiotic. (-)-pentenomycin I, from D-(-)-quinic acid are described; (±)-pentenomycin I is also prepared from 3-hydroxymethyl-2-methylfuran.
