Antiparasitic and antidepressant activities exhibited by tetramisole (I) and its enantiomers prompted the study of its structural analogs trans-2-[N-(2-hydroxy-1,2,3,4-tetrahydronaphthalene/indane-1-yl)]iminothiazolidine (VIII/IX) and 2,3,4a,5,6,10b-hexahydronaphtho[1',2':4,5]-imidazo[2,1-b]thiazole (XII), 2,3,4a,5-tetrahydro-9bH-indeno[1',2':4,5]imidazo[2,1-b]thiazole (XIII), and 2,3,4a,5-tetrahydro-9bH-indeno[1',2':4,5]imidazo[2,1-b]thiazole (XVI), and a homolog 3,4,6,7-tetrahydro-7-phenyl-2H-imidazo[2,1-b]-1,3-thiazine (XX). While none of these compounds showed any noteworthy antiparasitic activity, the trans-2-[N-(2-hydroxy-1,2,3,4-tetrahydronaphthalene-1-yl)]iminothiazolidine (VIII) has shown marked antidepressant activity, better than imipramine in the tests used, and provides a new structural lead for antidepressants.
四唑(I)及其对映体展示的抗寄生虫和抗抑郁活性促使研究其结构类似物,包括trans-2-[N-(2-羟基-1,2,3,4-四氢萘/茚-1-基)]亚噻唑啉(VIII/IX)和2,3,4a,5,6,10b-六氢萘[1',2':4,5]-咪唑[2,1-b]噻唑(XII),2,3,4a,5-四氢-9bH-茚[1',2':4,5]咪唑[2,1-b]噻唑(XIII)和2,3,4a,5-四氢-9bH-茚[1',2':4,5]咪唑[2,1-b]噻唑(XVI),以及同系物3,4,6,7-四氢-7-苯基-2H-咪唑[2,1-b]-1,3-噻嗪(XX)。虽然这些化合物中没有一个显示出任何值得注意的抗寄生虫活性,但trans-2-[N-(2-羟基-1,2,3,4-四氢萘-1-基)]亚噻唑啉(VIII)表现出显著的抗抑郁活性,在所使用的测试中比丙米嗪更好,并为抗抑郁剂提供了新的结构线索。