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Studies in natural products

Doğal bileşikler hakkında çalışmalar

  1. Tez No: 712726
  2. Yazar: SELMA BAL
  3. Danışmanlar: PROF. PROF. DR. J. D. CONNOLLY
  4. Tez Türü: Doktora
  5. Konular: Kimya, Chemistry
  6. Anahtar Kelimeler: Belirtilmemiş.
  7. Yıl: 2002
  8. Dil: İngilizce
  9. Üniversite: The University of Glasgow
  10. Enstitü: Yurtdışı Enstitü
  11. Ana Bilim Dalı: Organik Kimya Ana Bilim Dalı
  12. Bilim Dalı: Belirtilmemiş.
  13. Sayfa Sayısı: 226

Özet

Bu tez onbir bolilmden olusmaktadir ve dogada yetisen bircok cigerotu(liverwort) ile beraber Piper chaba ve /nu/a klengii adli 9i9ekli bitkilerin i9erdigi 9esitli bilesikleri kimyasal yonden (Phytochemi

Özet (Çeviri)

This thesis consists of eleven chapters and deals with phytochemical investigations of several liverwort species together with Piper chaba and Inula klengii. The first -chapter gives a general introduction dealing with the natur-e of secondary metabolites and the skeletal types found in the Hepaticae. This is followed by an examination of the chemical constituents found in the liverwort Scapania undulata. Three known compounds were isolated from this liverwort and these are: (­ )-ent-longipinanol, (-)-longibomeol, and an amorphane/muurolane{cadinane) type sesquiterpenoid, which probably came from the liverwort Marsupella aquatica mixed with S. undulata in their growing habitat. The t_hird chapter consists of an investigation of the extrnct of a flowering plant called Piper chaba, sent to us by a Chinese colleague. Four known compounds, piperine, pipemonaline, guineensine and the isobutylamide of 13-(3,4- methylenedioxyphenyl)undeca-2,4,12-trienoic acid were isolated. The following chapter examines the chemical constituents of the Scottish liverwort Conocephalum conicum, which gave 3,4'-dihydroxybibenzyl and 3,4-dimethoxystyrene. The metabolites of Nardia scalaris form the subject matter of Chapter 5. Three known em-kaurane diterpenoids, (15S)-ent-kaur-l6-en-15-yl hydrogen malonate, (15R)-ent-kaur-16--en-15-ol and ent-kaur-16-en-15a,3 -diol have been found in this liverwort. The chemical constituents of the liverwort Trichocolea tomentella are revealed in the next chapter. Four known compounds, deoxytomentellin, trichocolein, tomentellin, isotomentellin and two new compounds Methyl 4-[7-hydroxy-3,7-dimethyl-2,5-octadienyloxy]-3-methoxybenzoate, and Methyl 4-(5 hydroxy-3,7-dimethyl-2,6-octadienyloxy]-3-methoxybenzoate were isolated. Chapter 7 deals with the constituents of the Taiwanese liverwort Scapania r-obusfa, which afforded ent-spathulenol, found in many liverworts. The following chaptfr examines the metabolites of th-e extract of the flowering plant lnula klengii. Two new sesquiterpene lactones, 8 -angeloyloxy-14-acetyl-1(10),4,11(13)- germr:ratrien-12,6a-olide, and 8 -angeloyloxy-14-hydrox y-1(10),4,11(13)- germrcratrien-12,6a-olide as well as the known lactones melampolide and ovatifolin were isolated. Chapter 9 deals with the constituents of Marsupeila aquatica, which gave the known sesquiterpenoids marsupellone, acetox ymarsupellone, 9,lla,14- triacetoxymarsupellone, 9,11 ,14 triacetoxymarsupellone, and marsupellol. Chapter 10 examines the metabolites of Scottish liv,erworts Herbertus dicramus and H. stramineus. Two sesquiterpenoids, a- and - herbertenols, were present in both liverworts, however a new herbertane-type sesquiterpenoid has been isolated from Herbertus stramineus. The ne,

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