Browsing by Author "Ung Alison"

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Browsing by Author "Ung Alison"

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  • Oxidation of acyclic alkenes and allyl and benzyl ethers with DIB/t-BuOOH/Mg(OAc)2 
    Sastraruji Thanapat; Pyne S.; Ung Alison (Pergamon, 2012)
    Oxidation of (11Z)-1',2'-didehydrostemofoline with DIB/TBHP/Mg(OAc)(2)center dot 4H(2)O resulted in oxidative cleavage of the C-11-C-12 double bond instead of the desired allylic oxidation of the 1-butenyl side chain. ...
  • Phytochemical and Larvicidal Studies on Stemona curtisii: Structure of a New Pyrido[1,2-a]azepine Stemona Alkaloid 
    Mungkornasawakul Pitchaya; Pyne Stephen; Jatisatienr Araya; Supyen Damrat; Jatisatienr Chaiwat; Lie Wilford; Ung Alison; Skelton Brian; White Allan (American Chemical Society, 2004)
    A new pentacyclic Stemona alkaloid, stemocurtisinol (3), with a pyrido[1,2-a]azepine A,B-ring system, and the known pyrrolo[1,2-a]azepine alkaloid oxyprotostemonine (4) have been isolated from a root extract of S. curtisii. ...
  • Phytochemical Investigations of Stemona curtisii and Synthetic Studies on Stemocurtisine 
    Chaiyong Sukanda; Jatisatienr Araya; Mungkornasawakul Pitchaya; Sastraruji Thanapat; Pyne S.; Ung Alison; Urathamakul Thitima; Lie Wilford (American Chemical Society, 2010)
    The isolation of two new Stemona alkaloids, 1-hydroxyprotostemonine and stemocurtisine N-oxide, and a new benzofuran, stemofuran L, from the root extracts of Stemona curtisii is reported. The major known alkaloids from ...
  • Phytochemical Studies on Stemona aphylla: Isolation of a New Stemofoline Alkaloid and Six New Stemofurans 
    Sastraruji Thanapat; Chaiyong Sukanda; Jatisatienr Araya; Pyne S.; Ung Alison; Lie Wilford (American Chemical Society, 2011)
    A new stemofoline alkaloid, (2'S)-hydroxy-(11S,12R)-dihydrostemofoline (3), new stemofurans M-R (8-13), and known compounds stemofoline (1), (2?S)-hydroxystemofoline (2), stemofuran E (4), stemofuran F (5), stemofuran J ...
  • Phytochemical Studies on Stemona burkillii Prain: Two New Dihydrostemofoline Alkaloids 
    Mungkornasawakul Pitchaya; Pyne Stephen; Jatisatienr Araya; Lie Wilford; Ung Alison; Issakul Kritchaya; Sawatwanich Auntika; Supyen Damrat; Jatisatienr Chaiwat (American Chemical Society, 2004)
    Two new dihydrostemofoline alkaloids, 11(S),12(R)-dihydrostemofoline (3) and stemoburkilline (4), along with stemofoline (1) and 2`-hydroxystemofoline (2) have been isolated from a root extract of Stemona burkillii Prain. ...
  • Phytochemical Studies on Stemona Plants: Isolation of New Tuberostemonine and Stemofoline Alkaloids 
    Sastraruji Thanapat; Jatisatienr Araya; Issakul Kritchaya; Pyne Stephen; Ung Alison; Lie Wilford; Williams Morwenna (Natural Product Inc., 2006)
    Six new stemofoline alkaloids, (2`R)-hydroxystemofoline (5), (3`R)-stemofolenol (6), (3`S)-stemofolenol (7), 1`,2`-didehydrostemofoline-N-oxide (8), the first C19 stemofoline alkaloid, methylstemofoline (9), and the first ...
  • Phytochemical Studies on Stemona Plants: Isolation of Stemofoline Alkaloids 
    Sastraruji Thanapat; Jatisatienr Araya; Pyne Stephen; Ung Alison; Lie Wilford; Williams Morwenna (American Chemical Society, 2005)
    Six new stemofoline alkaloids, (2¢R)-hydroxystemofoline (5), (3¢R)-stemofolenol (6), (3¢S)-stemofolenol (7),1¢,2¢-didehydrostemofoline-N-oxide (8), the first C19 stemofoline alkaloid, methylstemofoline (9), and the first ...
  • Prediction and Structure of Polymorphic Lattice Inclusion Compounds of 2,7-Dimethyltricyclo[4.3.1.03,8]undecanesyn- 2,syn-7-diol 
    Ung Alison; Bishop Roger; Craig Donald; Dance Ian; Scudder Marcia (Pergamon, 1993)
    The host molecule 2,7-drmethylmcyclo[4 3 1 03~a]undecane-syn-2,rysyn-7-diol 1 is known to fotm two d&rent structural types of latuce mcluaon compound dependent on the guest molecule chosen Guests, mcludmg 1,Zdlchlorobenzene ...
  • The pyrido[1,2-a]azepine Stemona alkaloids 
    Pyne Stephen; Ung Alison; Jatisatienr Araya; Mungkornasawakul Pitchaya (Maejo University, 2007)
    This paper reviews the isolation, structure elucidation, proposed biosynthesis and biological activities of the small, but increasing, number of pyrido[1,2-a]azepine Stemona alkaloids.
  • Semi-Synthesis and Acetylcholinesterase Inhibitory Activity of Stemofoline Alkaloids and Analogs 
    Sastraruji K.; Sastraruji T.; Pyne S.; Ung Alison; Jatisatienr A.; Lie W. (American Chemical Society, 2010)
    Semisynthesis of the known Stemona alkaloids oxystemofoline (7) and methoxystemofoline (8) has been achieved starting from (11Z)-1⿲,2⿲-didehydrostemofoline (6), which confirmed their structures and absolute configurations. ...
  • Semisynthesis and Biological Activity of Stemofoline Alkaloids 
    Baird Morwenna; Pyne Stephen; Ung Alison; Lie Wilford; Sastraruji Thanapat; Jatisatienr Araya; Jatisatienr Chaiwat; Dheeranupattana Srisulak; Lowlam Jaturong; Boonchalermkit Sukanya (American Chemical Society, 2009)
    The semisynthesis of the Stemona alkaloids (3?R)-stemofolenol (1), (3?S)-stemofolenol (2), methylstemofoline (3), and (3?S)-hydroxystemofoline (5) and the unnatural analogues (11E)-methylstemofoline (15) and 3?R-hydroxystemofoline ...
  • Stemocurtisine, the First Pyrido[1,2-a]azapine Stemona Alkaloid 
    Mungkornasawakul Pitchaya; Pyne Stephen; Jatisatienr Araya; Supyen Damrat; Lie Wilford; Ung Alison; Skelton Brian; White Allan (American Chemical Society, 2003)
    A new pentacyclic stemona alkaloid, stemocurtisine (2), with a novel pyrido[1,2-a]azapine A,B-ring system, has been isolated from a root extract of Stemona curtisii. The structure and relative stereochemistry was determined ...
  • Stemofoline ethyl acetate solvate 
    Mungkornasawakul Pitchaya; Pyne Stephen; Ung Alison; Jatisatienr Araya; Willis Anne-Marie (Wiley-Blackwell Publishing, Inc, 2009)
    Crystals of the title compound, C22H29NO5 center dot C4H8O2, {[systematic name: (2R,3R,5R,5aS,6R,8aR,9S)-(5Z)-5-[3-butyl-tetrahydro-6-methyl-2,5-methano-4,3,8a-[1]propanyl[3]ylidenefuro[3,2-f][1,4]oxazepin-7(5H)-ylidene] ...
  • Structural Revision of Stemoburkilline from an E-Alkene to a Z-Alkene 
    Sastraruji Kwankamol; Pyne Stephen; Ung Alison; Mungkornasawakul Pitchaya; Lie Wilford; Jatisatienr Araya (American Chemical Society, 2009)
    Semisynthesis studies starting from (11Z)-1?,2?-didehydrostemofoline (4) indicated that the known Stemona alkaloid stemoburkilline is the Z-isomer and not the E-isomer as initially reported. The semisynthesis involved ...
  • Syntheses of spiro[cyclopropane-1,3'-oxindole]-2-carboxylic acid and cyclopropa[c]quinoline-7b-carboxylic acid and their derivatives 
    Yong Sarah; Ung Alison; Pyne Stephen; Skelton Brian; White Allan (Pergamon, 2007)
    The synthesis of spiro[cyclopropane-1,3?-oxindole]-2-carboxylic acid, including novel 3-(2- and 3-pyridyl)-substituted analogues and the novel cyclopropa[c]quinoline-7b-carboxylic acid and their ester and amide derivatives ...
  • Synthesis and antagonist activities of 4-aryl-substituted conformationally restricted cyclopentenyl and cyclopentanyl-glutamate analogues 
    Ung Alison; Pyne Stephen; Batenburg-Nguyen Uta; Davis Andrew; Sherif Azlifa; Bischoff Francâ¸Ois; Lesage Anne (Pergamon, 2005)
    The conformationally restricted glutamate analogues, 4-aryl-1-amino-2-cyclopentene-1,3-dicarboxylates and their cyclopentane analogues have been prepared in a diastereoselective manner. Biological studies of 12a and 12b ...
  • Synthesis of 2-acetyl-5-(1,2,3,4,5,6-hexahydroxyhexyl) thiazoles 
    Ung Alison; Pyne S.; Joeffreys George; Skelton Brian; White Allan (Springer, 2011)
    The syntheses of two diastereoisomers of 2-acetyl-5-(1,2,3,4,5,6-hexahydroxyhexyl) thiazole are reported. The synthesis of these diastereoisomers involved the coupling of 5-metallated 2-(1,1-dimethoxyethyl)thiazole with ...
  • Synthesis of 2'-Aminoalkyl-1-benzylisoquinoline derivatives, medium sized ring analogues with mu opiod receptor binding activities 
    Mbere-Nguyen U.; Ung Alison; Pyne Stephen (Pergamon, 2010)
    Novel 20-aminoalkyl-1-benzylisoquinoline compounds and medium size ring analogues have been prepared using reductive alkylation methods. Four of these analogues were tested for biological activity across 48 different CNS ...
  • Synthesis of 2-azaspiro[4.4]nonan-1-ones via phosphine-catalysed [3+2]-cycloadditions 
    Yong Sarah; Williams Morwenna; Pyne Stephen; Ung Alison; Skelton Brian; White Allan; Turner Peter (Pergamon, 2005)
    The phosphine-catalyzed [3+2]-cycloaddition of the 2-methylene ?-lactams 4 and 5 and the acrylate 6 with the ylides derived from the ethyl ester, the amide or the chiral camphor sultam derivative of 2-butynoic acid (7a¿c) ...
  • Synthesis of alkaloid-like compounds via the bridging Ritter Reaction 
    Hemtasin Chulida; Ung Alison; Kanokmedhakul Somdej; Kanokmedhakul Kwanjai; Bishop Roger; Sastraruji Thanapat; Bishop David (Springer, 2012)
    Alkaloid-like compounds containing a benzo[c]azepine core structure were successfully prepared in three steps from H-dibenzo[a,d]cyclohepten-5-ol via the bridging Ritter reaction. Biological studies of these compounds ...