摘要:
The tripeptide derivatives of formula 1H--L--Pro--N(R.sup.1)CH(R.sup.2)CO--Y--R.sup.3 (1)in which R.sup.1 is hydrogen, lower alkyl or NR.sup.4 R.sup.5 wherein R.sup.4 and R.sup.5 each are lower alkyl, R.sup.2 is hydrogen or lower alkyl, R.sup.3 is amino, lower alkylamino, di(lower)alkylamino or amino(lower)alkylamino and Y is one of the amino acid residues Gly or D-Ala with the proviso that when R.sup.1 is NR.sup.4 R.sup.5 wherein R.sup.4 and R.sup.5 are as defined herein and R.sup.2 and Y are as defined herein, R.sup.3 is lower alkylamino, di(lower)alkylamino or amino(lower)alkylamino, and a method for their preparation are disclosed. The tripeptide derivatives of formula 1 possess central nervous system activity and methods for their use are given.
摘要翻译:式1的HL-Pro-N(R1)CH(R2)CO-Y-R3(1)的三肽衍生物,其中R 1是氢,低级烷基或NR 4 R 5,其中R 4和R 5各自是低级烷基,R 2是氢或更低 烷基,R3是氨基,低级烷基氨基,二(低级)烷基氨基或氨基(低级)烷基氨基,Y是氨基酸残基Gly或D-Ala之一,条件是当R 1是NR 4 R 5时,其中R 4和R 5如本文所定义 并且R 2和Y如本文所定义,R 3是低级烷基氨基,二(低级)烷基氨基或氨基(低级)烷基氨基,并且公开了其制备方法。 式1的三肽衍生物具有中枢神经系统活性,并给出了其使用方法。
摘要:
The present invention relates to a method and apparatus for the generation of voltage pulses for controlling the switching operation in switching power supplies. A voltage increase of a pulse generator is respectively started when reaching a first, lower threshold (A). Resetting of the voltage increase is carried out in free-running mode, when the voltage increase reaches a second (D) or a third (C) threshold lying between the first (A) and the second (D) one. In sync mode, the pulse edges occurring in the synchronization signal (V.sub.sync) effect resetting of the voltage increase. The advantages of the invention lie in the fact that the switching current, occurring at the change form free-running mode to sync mode due to the frequency difference, is minimized and that the generator operates reliably.
摘要:
There are disclosed herein derivatives of imidazolidin-2-ones and -2-thiones of the formula I ##SPC1##and their acid addition salts with pharmacologically acceptable acids, in which R.sup.1 is hydrogen or lower alkyl; R.sup.2 is lower alkyl, nitrothiazolyl, or nitrofuryl; or R.sup.1 and R.sup.2 together with the nitrogen to which they are attached are a heterocyclic group containing 4-6 carbon atoms, or 4 carbon atoms and an additional nitrogen atom which may optionally be substituted with a lower alkyl group, or 4 carbon atoms and an oxygen atom, R.sup.3 is hydrogen or lower alkyl; R.sup.4 is lower alkyl or aralkyl, or R.sup.3 and R.sup.4 together with the carbon atom 5 of the imidazolidine ring to which they are attached are a carbocyclic ring containing 5-6 carbon atoms attached in spiro fashion to said imidazolidine ring; R.sup.5 is lower alkyl or cycloalkyl containing from 5-6 carbon atoms; and X is an oxygen or a sulfur atom. The compounds of this invention possess positive inotropic activity and are useful as cardiac stimulants.