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Diazonium Group Substitution: –OH and –H01:19

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Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
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Heterocyclic aromatic compounds are cyclic compounds that are aromatic and have one or more heteroatoms—atoms other than carbon, in the ring. Depending upon the number of atoms present in the ring, they can be either five or six-membered. Examples of five-membered heterocyclic aromatic compounds include pyrrole, furan, thiophene, and imidazole. Pyrrole consists of one nitrogen atom having one lone pair of electrons. Furan and thiophene have one oxygen and one sulfur heteroatom,...
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Four New Sesquiterpenoids from Zanthoxylum nitidum.

Feng Qin1, Mei-Shan Li1, Jin-Jun Li1

  • 1State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Collaborative Innovation Center for Guangxi Ethnic Medicine, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, Guilin, 541004, P. R. China.

Chemistry & Biodiversity
|June 9, 2022
PubMed
Summary

Researchers isolated four new sesquiterpenoids and six known coumarins from Zanthoxylum nitidum. These compounds, including nitidumine A-D, showed no cytotoxicity against tested cancer cell lines.

Keywords:
Zanthoxylum nitidumcoumarincytotoxicitysesquiterpenoid

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Area of Science:

  • Natural Product Chemistry
  • Medicinal Chemistry
  • Pharmacognosy

Background:

  • Zanthoxylum nitidum (Roxb.) DC. is a traditional medicine in Guangxi, China, used for anti-inflammatory, analgesic, and hemostatic purposes.
  • Known as "Ru Shan Hu" in Yao medicine and "Liang Bei Zhen" in Zhuang medicine, its chemical constituents are of significant interest.

Purpose of the Study:

  • To isolate and characterize new and known chemical compounds from Zanthoxylum nitidum.
  • To evaluate the cytotoxic potential of the isolated compounds against various human cancer cell lines.

Main Methods:

  • Extraction of Zanthoxylum nitidum using 95% ethanol.
  • Isolation and purification of compounds using spectroscopic analyses (NMR, HR-ESI-MS).
  • Determination of absolute configurations using electronic circular dichroism (ECD) and evaluation of cytotoxicity via MTT assay.

Main Results:

  • Four new sesquiterpenoids (nitidumine A-D) and six known coumarins were successfully isolated.
  • The structures of the new compounds were elucidated using comprehensive spectroscopic data.
  • Electronic circular dichroism (ECD) was employed to determine the absolute configurations of nitidumine A-D.
  • None of the isolated compounds exhibited significant cytotoxicity against T24, HeLa, MGC-803, A549, and HepG2 cancer cell lines.

Conclusions:

  • The study successfully identified novel sesquiterpenoids and known coumarins from Zanthoxylum nitidum.
  • The isolated compounds from Zanthoxylum nitidum did not demonstrate cytotoxic activity in the evaluated cancer cell lines.
  • This research contributes to the understanding of Zanthoxylum nitidum's chemical profile and provides a basis for further investigation.