New thiazolidine derivatives of the general formula: ##STR1## wherein X stands for a proline or thioproline residue and R for --CH.sub.2 OH or --CHO, a process for preparing the same which comprises reacting N-benzyloxycarbonyl-L-proline or --L-thioproline with L-thioprolinol and, if necessary, oxidizing the resultant N-benzyloxycarbonyl-L-prolyl-L-thioprolinol or --L-thioprolyl-L-thioprolinol to the corresponding thioprolinal compound, and an anti-amnestic composition containing at least one of the thiazolidine derivatives together with a conventional excipient. The new thiazolidine derivatives are extremely strong in anti-amnestic activity when compared with known similar anti-amnestic agents.
通用公式为:##STR1## 其中X代表脯
氨酸或
硫代脯
氨酸残基,R代表--CH.sub.2 OH或--CHO,制备这些衍
生物的过程包括将
N-苄氧羰基-L-脯氨酸或--
L-硫代脯氨酸与L-
硫代脯
氨醇反应,并且必要时将生成的
N-苄氧羰基-L-脯
氨酰-L-
硫代脯
氨醇或--L-
硫代脯
氨酰-L-
硫代脯
氨醇氧化为相应的
硫代脯醛化合物,以及含有至少一种
噻唑啉衍
生物和常规赋形剂的抗遗忘组合物。与已知的类似抗遗忘剂相比,这些新的
噻唑啉衍
生物在抗遗忘活性方面非常强大。