Abstract: A spiro derivative of the pyrazolo [1,5-d] [1,2,4] triazine ring system of the formula I ##STR1## wherein R.sub.1 and R.sub.2 represent, independently from each other, a hydrogen atom or a C.sub.1-4 alkyl group,R.sub.3 stands for a hydrogen atom, an unbranched or branched C.sub.1-4 alkyl, C.sub.2-5 alkenyl or benzyl group,R.sub.4 represents a hydrogen atom, an unbranched or branched C.sub.1-4 alkyl, C.sub.4-6 cycloalkyl, an unsubstituted or mono-halo or polyhalo benzyl group, andn is a whole number from 4 to 8,wherein R stands for an unbranched or branched C.sub.1-4 alkyl, or C.sub.4-6 cycloalkyl, C.sub.2-5 alkenyl, an unsubstituted or a monohalogeno or polyhalogenobenzyl group, and X represents a halogen or a 4-methyl-phenylsulfonyloxy group. Compounds of the formula I exhibit valuable CNS activities.

Abstract: The invention relates to new 3,4-dihydro-5H-2,3-benzodiazepine derivatives of general formula (I) and pharmaceutically acceptable acid addition salts thereof, ##STR1## wherein R represents a phenyl group optionally carrying one or two substituents selected from the group consisting of halogen, hydroxy, C.sub.1-4 alkoxy and benzyloxy; a furyl or a thienyl group,R.sup.1 stands for a hydrogen atom or a C.sub.1-4 alkyl group,R.sup.2 and R.sup.3 each represent hydrogen atom, C.sub.1-4 alkoxy, C.sub.4-7 cycloalkoxy or benzyloxy group.The new compounds of the general formula (I) can be prepared by reducing a 5H-2,3-benzodiazepine derivative of the general formula (II) ##STR2## wherein R, R.sup.1, R.sup.2 and R.sup.3 have the above-defined meanings, with an inorganic or organic hydride and/or complex metal hydride.The new compounds of the general formula (I) possess significant central nervous effects and can advantageously be used in the therapy.