Browsing 06 Biological Sciences by Author "Ung Alison"

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Browsing 06 Biological Sciences by Author "Ung Alison"

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  • 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 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 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 ...
  • 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. ...
  • 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 ...