Synthetic and photochemical studies of substituted 1-acyl-7-nitroindolines

Photochem Photobiol Sci. 2005 Nov;4(11):887-96. doi: 10.1039/b508756b. Epub 2005 Sep 14.

Abstract

A previous study of substituent effects on the photo-cleavage of 1-acyl-7-nitroindolines has been extended to examine the effects of electron-donating and electron-withdrawing substituents. 1-Acetyl-4,5-methylenedioxy-7-nitroindoline was inert to 350 nm irradiation, reinforcing an earlier finding that excessive electron-donation by substituents can divert the excited state into non-productive pathways. By contrast, the 1-acetyl-5,7-dinitro- and 1-acetyl-4-methoxy-5,7-dinitroindolines and respectively both showed improved photolysis efficiency in aqueous solution compared to the 1-acyl-4-methoxy-7-nitro compound . Unlike , both and gave mixed photoproducts, the corresponding dinitroindolines and the 5-nitro-7-nitrosoindoles. These results are interpreted in terms of a previous mechanistic study. Investigation of the 4-methoxy-5,7-dinitroindoline conjugate of L-glutamate showed that the stoichiometry of glutamate release upon photolysis was only 65-77% of the theoretical value, suggesting that photolysis of these dinitro compounds may involve pathways other than the clean photolysis previously observed for mono-nitro compounds such as .

Publication types

  • Research Support, N.I.H., Extramural

MeSH terms

  • Animals
  • Cells, Cultured
  • Glutamic Acid / biosynthesis
  • Glutamic Acid / chemistry
  • Glutamic Acid / metabolism
  • Indoles / chemistry*
  • Indoles / classification
  • Indoles / radiation effects
  • Nitro Compounds / chemistry*
  • Nitro Compounds / classification
  • Nitro Compounds / radiation effects
  • Photochemistry*
  • Receptors, Neurotransmitter / metabolism
  • Ultraviolet Rays

Substances

  • 1-acyl-7-nitroindoline
  • Indoles
  • Nitro Compounds
  • Receptors, Neurotransmitter
  • Glutamic Acid