204078-26-2Relevant articles and documents
Intramolecular Charge Transfer with the Planarized 4-Aminobenzonitrile 1-tert-Butyl-6-cyano-1,2,3,4-tetrahydroquinoline (NTC6)
Zachariasse, Klaas A.,Druzhinin, Sergey I.,Bosch, Wilfried,Machinek, Reinhard
, p. 1705 - 1715 (2004)
Fast and efficient intramolecular charge transfer (ICT) and dual fluorescence is observed with the planarized aminobenzonitrile 1-tert-butyl-6-cyano-1,2,3,4-tetrahydroquinoline (NTC6) in a series of solvents from n-hexane to acetonitrile and methanol. Such a reaction does not take place for the related molecules with 1-isopropyl (NIC6) and 1-methyl (NMC6) groups, nor with the 1-alkyl-5-cyanoindolines with methyl (NMC5), isopropyl (NIC5), or tert-butyl (NTC5) substituents. For these molecules, a single fluorescence band from a locally excited (LE) state is found. The charge transfer reaction of NTC6 is favored by its relatively small energy gap ΔE(S1,S 2), in accordance with the PICT model for ICT in aminobenzonitriles. For the ICT state of NTC6, a dipole moment of around 19 D is obtained from solvatochromic measurements, similar to μe(ICT) = 17 D of 4-(dimethylamino)benzonitrile (DMABN). For NMC5, NIC5, NTC5, NMC6, and NIC6, a dipole moment of around 10 D is determined by solvatochromic analysis, the same as that of the LE state of DMABN. For NTC6 in diethyl ether at -70 °C, the forward ICT rate constant (1.3 × 109 s-1) is much smaller than that of the back reaction (5.9 × 109 s -1), showing that the equilibrium is on the ICT side. The results presented here make clear that ICT can very well take place with a planarized molecule such as NTC6, when ΔE(S1,S2) is sufficiently small, indicating that a perpendicular twist of the amino group relative to the rest of the molecule is not necessary for reaching an ICT state with a large dipole moment. The six-membered alicyclic ring in NMC6, for example, prevents ICT by increasing ΔE(S1,S2) relative to that of DMABN.
COMPOUNDS AND COMPOSITIONS FOR THE TREATMENT OF PARASITIC DISEASES
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Page/Page column 230, (2014/06/11)
The present invention provides compounds of formula I: [INSERT FORMULA HERE] or a pharmaceutically acceptable salt, tautomer, or stereoisomer, thereof, wherein the variables are as defined herein. The present invention further provides pharmaceutical compositions comprising such compounds and methods of using such compounds for treating, preventing, inhibiting, ameliorating, or eradicating the pathology and/or symptomology of a disease caused by a Plasmodium parasite, such as malaria.
Method of inhibiting neoplastic cells with imidazoquinazoline derivatives
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, (2008/06/13)
A method for inhibiting neoplasia, particularly cancerous and precancerous lesions by exposing the affected cells to imidazoquinazoline derivatives.
Imidazoquinazoline derivatives
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, (2008/06/13)
PCT No. PCT/JP97/03023 Sec. 371 Date Apr. 27, 1998 Sec. 102(e) Date Apr. 27, 1998 PCT Filed Aug. 29, 1997 PCT Pub. No. WO98/08848 PCT Pub. Date Mar. 5, 1998Imidazoquinoline derivatives of the formula (wherein X may be O or S) provide selective cyclic guanosine 3',5' monophosphate (cGMP)-specific phosphodiesterase (PDE) inhibitory activity. The compounds are useful for treating or ameliorating cardiovascular disease such as thrombosis, angina pectoris, hypertension, heart failure and arterial sclerosis, as well as asthma, impotence and the like.