Influence of Substituents on the Lappaconitine Acetylenic Derivatives Photodegradation

A. A. Schlotgauer, V. I. Klimentiev, V. S. Kornievskaya, N. E. Polyakov, A. A. Stepanov, S. F. Vasilevsky, T. V. Leshina

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The natural alkaloid lappaconitine, the anthranilic acid ester, is used against arrhythmias in medical practice, but it undergoes significant photodegradation. The latter may be the cause of the drugs phototoxicity. Furthermore, other esters of anthranilic acid are also widely used in practice, for example, as UV filters; so their photostability is an important characteristic. Thus, the improvement of these compounds resistance against light irradiation is the issue of the day. This work has shown that the appending of a substituent through the acetylene bridge into the anthranilic acid aromatic ring can significantly decrease the lappaconine derivatives photodegradation degree. The photodegradation process, according to the chemically induced dynamic nuclear polarization (CIDNP) analysis, begins with intramolecular or intermolecular reversible electron transfer (ET) with subsequent cleavage of the ester bond. The main product of the photolysis is the quaternary ammonium salt of 20-ethyl-1-α,14-α,16-β-trimethoxyaconitane-4,8,9-triol (lappaconine) of substituted anthranilic acid. It was demonstrated that the photodegradation of the lappaconitine acetylenic derivatives occurs from their triplet excited states and the substitution influences primarily the triplet reactive state formation effectivity.

Original languageEnglish
Pages (from-to)559-573
Number of pages15
JournalApplied Magnetic Resonance
Volume46
Issue number5
DOIs
Publication statusPublished - 1 May 2015
Externally publishedYes

Fingerprint

esters
acids
triols
arrhythmia
alkaloids
acetylene
photolysis
cleavage
electron transfer
drugs
substitutes
salts
filters
irradiation
causes
rings
polarization
products
excitation

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Influence of Substituents on the Lappaconitine Acetylenic Derivatives Photodegradation. / Schlotgauer, A. A.; Klimentiev, V. I.; Kornievskaya, V. S.; Polyakov, N. E.; Stepanov, A. A.; Vasilevsky, S. F.; Leshina, T. V.

In: Applied Magnetic Resonance, Vol. 46, No. 5, 01.05.2015, p. 559-573.

Research output: Contribution to journalArticle

Schlotgauer, A. A. ; Klimentiev, V. I. ; Kornievskaya, V. S. ; Polyakov, N. E. ; Stepanov, A. A. ; Vasilevsky, S. F. ; Leshina, T. V. / Influence of Substituents on the Lappaconitine Acetylenic Derivatives Photodegradation. In: Applied Magnetic Resonance. 2015 ; Vol. 46, No. 5. pp. 559-573.
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