Synthetic and photochemical studies of substituted 1-acyl-7-nitroindolines.
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 .
Papageorgiou
George
G
National Institute for Medical Research, The Ridgeway, Mill Hill, London, UKNW7 1AA.
Ogden
David
D
Kelly
Geoff
G
Corrie
John E T
JE
D000818:Animals; D002478:Cells, Cultured; D018698:Glutamic Acid / Q000096:biosynthesis / Q000737:chemistry / Q000378:metabolism; D007211:Indoles / Q000737:chemistry* / Q000145:classification / Q000528:radiation effects; D009574:Nitro Compounds / Q000737:chemistry* / Q000145:classification / Q000528:radiation effects; D010777:Photochemistry; D017981:Receptors, Neurotransmitter / Q000378:metabolism; D014466:Ultraviolet Rays
C507697:1-acyl-7-nitroindoline; D007211:Indoles; D009574:Nitro Compounds; D017981:Receptors, Neurotransmitter; D018698:Glutamic Acid