摘要:
This invention relates to a process for preparing xanthine derivatives of formula I: ##STR1## characterized in that a uracil derivative of formula A or B ##STR2## is dissolved in a suitable organic-aqueous solvent and cyclized in the presence of LiOH.
摘要:
Compounds of the formula ##SPC1##WhereinR.sub.1 is hydrogen, chlorine, methyl, methoxy or trifluoromethyl,R.sub.2 is hydrogen or methyl,R.sub.3 is methyl or phenyl, andR.sub.4 and R.sub.5 together form a double bond or, in caseR.sub.1 is chloro, methyl or trifluoromethyl, are also hydrogen atoms,And non-toxic, pharmacologically acceptable acid addition salts thereof; the compounds as well as their salts are useful as sedatives and tranquilizers.