3-dimethyluracil and cyclohexene. Steady-state and time-resolved fluorescence experiments using a series of photoreductants and photooxidants have been run to evaluate the efficiency of the electron transfer process. Analysis of the obtained quenching kinetics shows that the azetidine compounds can act as electron donors. Additionally, it appears that the cis isomer is more easily oxidized than its trans counterpart
3,5-dioxo-(2H,4H)-1,2,4-triazine derivatives as 5HT.sub.1A ligands
申请人:Pierre Fabre Medicament
公开号:US05591743A1
公开(公告)日:1997-01-07
A 3,5-dioxo-(2H,4H)-1,2,4-triazine compounds of formula I ##STR1## in which: R.sub.1 and R.sub.2, which are identical or different, represent hydrogen or C.sub.1 -C.sub.6 alkyl, n is 2 to 6, inclusive, A represents aryl piperazino II ##STR2## the Ar grouping representing phenyl, naphthyl, pyrimidyl, or pyridyl, unsubstituted or substituted by C.sub.1 -C.sub.3 alkyl, C.sub.1 -C.sub.3 alkoxy, hydroxy, trifluoromethyl, or halogen, or III benzodioxanyl-methyl-amino or pyridodioxanyl-methyl-amino ##STR3## in which R represents hydrogen or C.sub.1 -C.sub.3 alkyl and X represents a nitrogen or carbon atom, therapeutically-acceptable salts and enantiomers thereof, pharmaceutical compositions thereof, and method for treatment of diseases requiring a 5HT.sub.1A receptor agonist therewith.
Comparison of the 13C and 15N NMR spectra of 8‐azatheophylline with those of its three methylated derivatives and other model compounds from the literature showed that 8‐azatheophylline exists to the extent of 80% in the N‐2 tautomeric form in DMSO solution.
An efficient and convenient method to synthesize 6-oxyalkylated 1,2,4-triazine-3,5(2H, 4H)-diones has been developed via visible-light-induced cross-dehydrogenative couplingreaction between 1,2,4-triazine-3,5(2H, 4H)-diones and ethers with a wide range of functional group tolerance. The present transformation employs the cheap and low-toxic 2-tert-butylanthraquinone as a metal-free photocatalyst and
1,2,4-3,5 (2 H , 4 H )-二酮类化合物通过可见光诱导的1,2,4之间的交叉脱氢偶联反应合成6-氧烷基化1,2,4-三嗪-3,5(2 H , 4 H )-二酮类化合物-triazine-3,5(2 H , 4 H )-二酮和醚,具有广泛的官能团耐受性。本次改造采用廉价低毒的二叔-丁基蒽醌在室温下作为无金属光催化剂和空气作为绿色氧化剂。此外,这种反应也可以由作为清洁能源的阳光驱动。该方法的合成效用通过克级反应和在生物活性分子关键中间体制备中的应用得到进一步证明。
Visible-light-induced direct perfluoroalkylation/heteroarylation of [1.1.1]propellane to diverse bicyclo[1.1.1]pentanes (BCPs) under metal and photocatalyst-free conditions
Herein, a green and novel multi-component reaction for direct perfluoroalkylation/heteroarylation of [1.1.1]propellane with heteroarenes and perfluoroalkyl iodines has been described. This transformation is facilitated by visible light in the absence of any transition-metal catalysts and photocatalysts. Various heteroarenes and perfluoroalkyl iodines are well compatible, providing the corresponding