method for the preparation of a pharmaceutical preparation with stimulating effect on the central nervous system.and method for preparation of former method suitable for use in 5 - substituted 2 - oxopyrrolidinederivaten with a ring nitrogen at the 4 - position.

摘要

The invention relates to novel 6-aryloxy-2-oxo-1-aza-4-(or thia)-spiro[4,5]decane compounds. These compounds are represented by the formula: IMAGE (I) in which A stands for an oxygen or sulfur heteroatom; R1 and R2 are each H, lower alkyl or aryl such as phenyl; X is H, a halogen atom such as chlorine or fluorine or a lower alkyl.