31542-63-9Relevant academic research and scientific papers
Synthesis of novel 3,7-dihydro-purine-2,6-Dione derivatives
Liu, Gang,Reddy, P.S. Murali,Barber, Jack R.,Ng, Shi Chung,Zhou, Yuefen
experimental part, p. 1418 - 1436 (2010/07/06)
Forty-six novel 3,7-dihydro-purine-2,6-dione derivatives (substituted xanthines) with great structural diversity were synthesized for biological activity screening. Three series of substituted xanthine analogs have been prepared in moderate to excellent y
Xanthines, optionally incorporated in liposomes, for promoting skin or hair pigmentation
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, (2008/06/13)
A method of treating skin or hair for promoting pigmentation wherein a xanthine component, in an amount effective to promote pigmentation, is incorporated in liposomes or hydrated lipidic lamellar phases.
Effects of Alkyl Substitutions of Xanthine Skeleton on Bronchodilation
Sakai, Ryosuke,Konno, Kayo,Yamamoto, Yasunori,Sanae, Fujiko,Takagi, Kenzo,et al.
, p. 4039 - 4044 (2007/10/02)
Structure-activity relationships in a series of 1,3,7-trialkyl-xanthine were studied with guinea pigs.Relaxant actions in the tracheal muscle were increased with alkyl chain length at the 1- and 3-positions of the xanthine skeleton, but decreased by alkylation at the 7-position.Positive chronotropic actions in the right atrium were potentiated with 3-alkyl chain length but tended to decrease with 1-alkylation and diminish by 7-substitution.Consequently, while the 1- and 3-substitutions were equally important for the tracheal smooth muscle relaxation, the substitution at the 1-position was more important than the 3-substitution for bronchoselectivity.The 7-alkylation may be significant to cancel heart stimulation.There were good correlations between the smooth muscle relexant action and the cyclic AMP-PDE inhibitory activity in 3-substituents and the affinity for adenosine (A1)receptors in 1-,3-, and 7-substituents.This suggests that not only the cyclic AMP-PDE inhibitory activity but also the adenosine antagonistic activity is important in the bronchodilatory effects of alkylxanthines.Among these xanthine derivatives, 1-butyl-3-propylxanthine and its 7-methylated derivative showed high bronchoselectivity in the in vitro and in vivo experiments compared to theophylline and enprofylline and may be new candidates for bronchodilator.
Analogue of Coffeine and Theophylline: Effect of Structural Alterations on Affinity at Adenosine Receptors
Daly, J. W.,Padgett, W. L.,Shamim, M. T.
, p. 1305 - 1308 (2007/10/02)
A variety of analogues of caffeine and theophylline in which the 1-, 3-, and 7-methyl substituents have been replaced with n-propyl, allyl, propargyl, and isobutyl and, in few cases with chloroethyl, hydroxyethyl, or benzyl were assessed for potency and s
