VERFAHREN ZUR HERSTELLUNG VON NEUEN SPIRO-DERIVATEN DES PYRAZOLO(1,5-D) (1,2,4)TRIAZIN RING-SYSTEMS

A spiro derivative of the pyrazolo [1,5-d] [1,2,4] triazine ring system of the formula I I wherein R1 and R2 represent, independently from each other, a hydrogen atom or a C1-4 alkyl group, R3 stands for a hydrogen atom, an unbranched or branched C1-4 alkyl, C2-5 alkenyl or benzyl group, R4 represents a hydrogen atom, an unbranched or branched C1-4 alkyl, C4-6 cycloalkyl, an unsubstituted or mono-halo or polyhalo benzyl group, and n is a whole number from 4 to 8, wherein R stands for an unbranched or branched C1-4 alkyl, or C4-6 cycloalkyl, C2-5 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.